CN103266220A - Roasting process for tin concentrate and special equipment column - Google Patents
Roasting process for tin concentrate and special equipment column Download PDFInfo
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- CN103266220A CN103266220A CN2013101575389A CN201310157538A CN103266220A CN 103266220 A CN103266220 A CN 103266220A CN 2013101575389 A CN2013101575389 A CN 2013101575389A CN 201310157538 A CN201310157538 A CN 201310157538A CN 103266220 A CN103266220 A CN 103266220A
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Abstract
The invention discloses a roasting process for a tin concentrate and a special equipment column, wherein high efficiency separation of arsenic in roasted tin ores can be realized by using the roasting process. The roasting process comprises the following steps: 1, roasting the tin concentrate so as to respectively obtain a roasted product and ash-laden gas; 2, successively carrying out first gas filtration and second gas filtration on the ash-laden gas, wherein the ash-laden gas to be filtered with a temperature of 460 to 900 DEG C is allowed to pass through a first filtering material during first gas filtration, the ash-laden gas to be filtered with a temperature of 110 to 240 DEG C is allowed to pass through a second filtering material during second gas filtration, the first filtering material and the second filtering material both have filtration accuracy of the ash-laden gas of 0.05 to 1 mu m, and at least the first filtering material is composed of a high temperature resistant sintered inorganic porous material; and 3, returning dust recovered from first gas filtration to a roasting step and discharging arsenic-rich dust recovered from second gas filtration out of tin smelting flow.
Description
Technical field
The present invention relates to the tin concentrate calcination process technology in the tin field of smelting, be specifically related to calcination process technology and the specific equipment row of tin concentrate.
Background technology
Present tin is smelted four the main processes that generally comprise of producing: the one, the tin concentrate is refined preceding calcination process; The 2nd, stannic oxide concentrate or tin concentrate calcining are carried out retailoring; The 3rd, the rich slag of the tin of retailoring operation output is carried out sulfiding volatilization; The 4th, the thick tin of retailoring operation output is carried out refining.In the prior art, the Industrial Stoves for calcination process before the tin concentrate is refined mainly contain multiple hearth furnace, fluidizing furnace or rotary kiln; The Industrial Stoves that are used for stannic oxide concentrate or tin concentrate calcining are carried out retailoring mainly contain reverberatory furnace, electric arc furnace, Australia Si Maite stove or Chinese mugwort Sa smelting furnace; Be used for the Industrial Stoves that the rich slag of the tin of retailoring operation output carries out sulfiding volatilization are mainly fuming furnace.When tin smelt to be produced, above-mentioned these Industrial Stoves all can output high temperature dust flue gas, therefore, the processing of these high temperature dust flue gases is just become tin smelt the important topic that can not be ignored in producing.
Boiling roaster with the tin concentrate is example: present tin concentrate calcination process technology at first is to obtain calcining and high temperature dust flue gas respectively by boiling roaster, contains the As that most of arsenic generates through oxidizing roasting in the former tin concentrate in this high temperature dust flue gas
2O
3Steam and a large amount of stanniferous dust, this ash-laden gas at first is admitted to tornado dust collector and carries out preliminary gas solid separation, and the content that reclaims tin in the dust that obtains is higher, can directly return boiling roaster, and because the efficiency of dust collection of tornado dust collector is lower, As
2O
3Steam and more stanniferous dust escape and enter surface cooler from the venting port of tornado dust collector and further cool, at this moment, and As
2O
3Steam changes As into
2O
3After this solid state crystallization body, carries out udst separation by fiber bag precipitator to ash-laden gas, reclaims to obtain high arsenic powder dirt, and tail gas then enters follow-up desulfurization and handles, and finally enters atmosphere; The high arsenic powder dirt of gained then is sent to electric heating rotary kiln again and heats the As that produces
2O
3Steam obtains high-grade arsenic dirt after by condensation and the dedusting of two-stage cloth bag type, and the residue after the volatilization then returns tin and smelts main flow and handle.
Fuming furnace volatilization with the rich slag of tin is example: the fuming furnace volatilization treatment process of the rich slag of present tin at first is to obtain waste residue and ash-laden gas respectively by fuming furnace sulfiding volatilization, contains the As that most arsenic generate through oxidizing roasting in the rich slag of former tin in this ash-laden gas
2O
3Steam and a large amount of SnS steam, this ash-laden gas at first is admitted to waste heat boiler and cools, and SnS steam wherein at first changes SnS solid state crystallization body into, and then enters surface cooler and further lower the temperature, at this moment, As
2O
3Steam changes As into
2O
3The solid state crystallization body, after this, by the two-stage fiber bag precipitator ash-laden gas is carried out dedusting, recovery obtains containing arsenic powder dirt, and (table 6 of " coming the behavior of arsenic in the smelting tin system and the research of distribution; Wang Wei; popular science and technology, the 1st phase in 2012 " literary composition shows that the content (weight percent) of arsenic in this dust only is 1.4%, can think and belong to the dust that hangs down arsenic content), because arsenic content is lower, this contains arsenic powder dirt and return the retailoring operation again after granulating, and tail gas is then made emission treatment.
Above-mentioned two examples are typical case of high temperature dust gas cleaning during tin is smelted.The present inventor therefrom sums up discovery, and ubiquity two big subject matters are handled in the high temperature dust gas cleaning at present tin being smelted: the first, can't directly isolate arsenic efficiently from the high temperature dust flue gas, so that recovery obtains a large amount of arsenic powder dirt that contain.Turn back in the tin smelting flow process if these are contained arsenic powder dirt, then can cause arsenic in whole system, to circulate and add up, smelt production thereby influence tin; If from these high arsenic powder dirt, further refine arsenic by technologies such as high temperature evaporation, condensations, exist system's construction and use cost higher again, the technical process complicated problems.The second, present high temperature dust flue gas purification system takes mechanical dust collector (comprising gravitational precipitator, tornado dust collector etc.), fiber bag precipitator to add the combining and configuring form of refrigerating unit more, and technical process is long, equipment is more.
Summary of the invention
The high temperature dust flue gas purifying technique during but the tin that the present invention at first will provide a kind of high efficiency separation to go out arsenic is smelted and specific equipment row; It less importantly provides a kind of calcination process technology and specific equipment row of realizing the tin concentrate of the high efficiency separation of arsenic in the tin roasted ore the present invention; In addition, the present invention also will provide the high temperature dust flue gas purification system in the short tin smelting of two kinds of technical process.
One, about high temperature dust flue gas purifying technique of the present invention and specific equipment row
High temperature dust flue gas purifying technique during tin is smelted, described high temperature dust flue gas comes from the Industrial Stoves in the tin smelting flow process, the step that this purification process comprises is: one, first smoke filtration and second smoke filtration that successively described ash-laden gas is carried out: in first smoke filtration, temperature is in 460～900 ℃ ash-laden gas to be filtered by first filtering material; In second smoke filtration, temperature is in 110～240 ℃ ash-laden gas to be filtered by second filtering material; The ash-laden gas filtering accuracy of described first filtering material and second filtering material is 0.05～1 μ m, and at least the first filtering material is to be made of high temperature resistant sintering inorganic porous material; Two, from first smoke filtration, reclaim the dust that obtains high tin content; Reclaim the dust of the high arsenic content that obtains from second smoke filtration, the tail gas behind second smoke filtration enters follow-up vent gas treatment.
In the high temperature dust flue gas purifying technique during above-mentioned tin is smelted, carry out before first smoke filtration, can be earlier by first refrigerating unit temperature of ash-laden gas be down to below 580 ℃ that (to be set at 580 ℃ be can reduce the contour temperature performance demands of the first filtering material anti-thermal shock with next to temperature herein, the 2nd, if first refrigerating unit is waste heat boiler, can also guarantee UTILIZATION OF VESIDUAL HEAT IN efficient) and satisfy the temperature requirement of first smoke filtration; Before carrying out second smoke filtration, can the ash-laden gas temperature be down to the requirement of satisfying second smoke filtration by second refrigerating unit earlier.Wherein, at least the first refrigerating unit can be waste heat boiler in first refrigerating unit and second refrigerating unit, thereby realizes the effective utilization to waste heat.
In the high temperature dust flue gas purifying technique during above-mentioned tin is smelted, also can directly be that ash-laden gas more than 680 ℃ carries out first smoke filtration with temperature, be down to the requirement of satisfying second smoke filtration by the exhaust temperature of refrigerating unit after with first smoke filtration then, again the ash-laden gas after cooling carried out second smoke filtration.Wherein, described refrigerating unit is preferably waste heat boiler.
In the high temperature dust flue gas purifying technique during above-mentioned tin is smelted, at least the first filtering material can be selected from existing high temperature resistant sintered ceramic porous material, high temperature resistant sintering metal porous material.The present invention advise in described first filtering material and second filtering material at least the first filtering material adopt heat-shock resistance better, higher sintering FeAl base intermetallic compound porous material or the sintering Fe of reliability during high temperature filtration
3Al base intermetallic compound porous material.
Term " ash-laden gas filtering accuracy " be defined as can filtering by mass 98% 〉=particle of a certain size, the size of this particle is filtering accuracy (down with).For example, when the ash-laden gas filtering accuracy of first filtering material and second filtering material is 0.5 μ m, namely show first filtering material and second filtering material can the filtering ash-laden gas in the particle of 98% size 〉=0.5 μ m by mass.The contriver finds, purification at high temperature dust flue gas in the tin smelting, it is optimal selection that the ash-laden gas filtering accuracy of first filtering material and second filtering material is set at 0.05～1 μ m, because when being set in the ash-laden gas filtering accuracy in this interval, the beat all while shows excellent aspect filtration efficiency, filtration pressure difference and filtering material regenerability, namely high filtration efficiency can either be guaranteed, the filtration pressure difference that suits and good filtering material regenerability can be guaranteed simultaneously again.On this basis, the ash-laden gas filtering accuracy of described first filtering material and second filtering material preferably is 0.3～0.8 μ m.
In the high temperature dust flue gas purifying technique during above-mentioned tin is smelted, described Industrial Stoves can comprise: tin is smelted multiple hearth furnace, fluidizing furnace and the rotary kiln that is used for the tin concentrate is refined preceding calcination process in the flow process, be used for reverberatory furnace, electric arc furnace, Australia Si Maite stove and Ai Sa smelting furnace that stannic oxide concentrate or tin concentrate calcining are carried out retailoring, and any one of fuming furnace that is used for the rich slag of the tin of retailoring operation output is carried out sulfiding volatilization.
In the high temperature dust flue gas purifying technique during above-mentioned tin is smelted, described second filtering material can be constituted or adopted cloth bag by the sintering inorganic porous material.
In the high temperature dust flue gas purifying technique during above-mentioned tin is smelted, in described second smoke filtration, preferably the temperature of ash-laden gas to be filtered is controlled below 200 ℃, so that As
2O
3Steam fully changes As into
2O
3The solid state crystallization body.
In the high temperature dust flue gas purifying technique during above-mentioned tin is smelted, described vent gas treatment comprises the desulfurization processing.
The specific equipment row of above-mentioned technology, comprise with tin and smelt the unit that gathers dust that the Industrial Stoves in the flow process are connected, handle by this unit that gathers dust from the high temperature dust flue gas of described Industrial Stoves discharging, the end of unit of gathering dust connects tail gas treating unit, the described unit that gathers dust successively comprises: first filtrating equipment of flue gas, and it has first filtering material that filters for the ash-laden gas to be filtered that temperature is in 460～900 ℃; Second filtrating equipment of flue gas, it has second filtering material that filters for the ash-laden gas to be filtered that temperature is in 110～240 ℃; The ash-laden gas filtering accuracy of described first filtering material and second filtering material is 0.05～1 μ m, and at least the first filtering material is to be made of high temperature resistant sintering inorganic porous material.
In the high temperature dust flue gas purifying equipment row during above-mentioned tin is smelted, can also comprise first refrigerating unit and second refrigerating unit, described first refrigerating unit is used for being down to below 580 ℃ the temperature of ash-laden gas and the temperature requirement of satisfied first smoke filtration between Industrial Stoves and first filtrating equipment of flue gas, and described second refrigerating unit is used for the ash-laden gas temperature is down to the requirement of satisfying second smoke filtration between first filtrating equipment of flue gas and second filtrating equipment of flue gas; At least the first refrigerating unit is waste heat boiler in first refrigerating unit and second refrigerating unit.
In the high temperature dust flue gas purifying equipment row during above-mentioned tin is smelted, the temperature in of described first filtrating equipment of flue gas also can be for more than 680 ℃; Be provided with the waste heat boiler that satisfies the second smoke filtration requirement for the ash-laden gas temperature is down between first filtrating equipment of flue gas and second filtrating equipment of flue gas.
Described Industrial Stoves can comprise: tin is smelted multiple hearth furnace, fluidizing furnace and the rotary kiln that is used for the tin concentrate is refined preceding calcination process in the flow process, be used for reverberatory furnace, electric arc furnace, Australia Si Maite stove and Ai Sa smelting furnace that stannic oxide concentrate or tin concentrate calcining are carried out retailoring, and any one of fuming furnace that is used for the rich slag of the tin of retailoring operation output is carried out sulfiding volatilization.
(mainly refer to As based on arsenic compound in the tin smelting high temperature dust flue gas
2O
3) (mainly refer to SnO with sn-containing compound
2Or SnS) difference of boiling point, when the temperature of tin smelting high temperature dust flue gas was in 460～900 ℃, arsenic was with As
2O
3The form of steam exists, and sn-containing compound is solid-state, at this moment, after filtering by first filtering material, the stanniferous dust is removed substantially in the flue gas, obtains the dust of high tin content, has realized the high efficiency separation of tin, arsenic thus; When the temperature of ash-laden gas is in 110～240 ℃, As
2O
3Steam changes As into
2O
3At this moment the solid state crystallization body, after the filtration of second filtering material, can obtain the dust of high arsenic content.Like this, the dust of high tin content can return tin and smelt in the flow process, tin is used more effectively, and the dust of high arsenic content is discharged from tin smelting flow process, avoid tin to smelt the circulative accumulation of arsenic in the flow process, while is conducive to the later use (the white arsenic of recovery can directly be used as Industrial products) of arsenic owing to arsenic grade in the dust of the high arsenic content of gained is higher, saves the recovery purifying technique that follow-up arsenic reclaims arsenic such as high temperature evaporation, condensation process.
Two, calcination process technology and the specific equipment about tin concentrate of the present invention is listed as
The calcination process technology of tin concentrate of the present invention, this technology can realize the high efficiency separation to arsenic in the tin roasted ore (general name of calcining and the dust that reclaims), it step that comprises is: one, the tin concentrate is carried out roasting, obtain calcining and ash-laden gas respectively, contain the As that most of arsenic generates through oxidizing roasting in the former tin concentrate in this ash-laden gas
2O
3Steam; Two, first smoke filtration and second smoke filtration that successively described ash-laden gas is carried out: in first smoke filtration, temperature is in 460～900 ℃ ash-laden gas to be filtered by first filtering material; In second smoke filtration, temperature is in 110～240 ℃ ash-laden gas to be filtered by second filtering material; The ash-laden gas filtering accuracy of described first filtering material and second filtering material is 0.05～1 μ m, and at least the first filtering material is to be made of high temperature resistant sintering inorganic porous material; Three, will from first smoke filtration, reclaim the dust that obtains and return calcination steps, or with the raw material of described calcining as follow-up retailoring operation; To reclaim the dust of the enrichment arsenic that obtains and discharge from tin smelting flow process from second smoke filtration, the tail gas behind second smoke filtration enters follow-up vent gas treatment.
In the calcination process technology of above-mentioned tin concentrate, before carrying out first smoke filtration, can be down to below 580 ℃ the temperature of ash-laden gas and the temperature requirement of satisfied first smoke filtration by first refrigerating unit earlier; Before carrying out second smoke filtration, can the ash-laden gas temperature be down to the requirement of satisfying second smoke filtration by second refrigerating unit earlier.
In the calcination process technology of above-mentioned tin concentrate, also can directly be that ash-laden gas more than 680 ℃ carries out first smoke filtration with temperature, be down to the requirement of satisfying second smoke filtration by the exhaust temperature of refrigerating unit after with first smoke filtration then, again the ash-laden gas after cooling carried out second smoke filtration.
In the calcination process technology of above-mentioned tin concentrate, at least the first filtering material is preferably by sintering FeAl base intermetallic compound porous material or sintering Fe in described first filtering material and second filtering material
3Al base intermetallic compound porous material constitutes.
In the calcination process technology of above-mentioned tin concentrate, the ash-laden gas filtering accuracy of described first filtering material and second filtering material is all preferably at 0.3～0.8 μ m.
In the calcination process technology of above-mentioned tin concentrate, described second filtering material can be constituted or adopted cloth bag by the sintering inorganic porous material.
In the calcination process technology of above-mentioned tin concentrate, in described second smoke filtration, preferably the temperature of ash-laden gas to be filtered is controlled below 200 ℃.
In the calcination process technology of above-mentioned tin concentrate, described vent gas treatment comprises the desulfurization processing.
Be exclusively used in the equipment row of the calcination process technology of above-mentioned tin concentrate, comprise stoving oven (comprising that multiple hearth furnace, fluidizing furnace and rotary kiln are used for the tin concentrate is refined the Industrial Stoves of preceding calcination process operation) and the unit that gathers dust that is connected with stoving oven, from the ash-laden gas of described stoving oven discharging, contain the As that most of arsenic generates through oxidizing roasting in the former tin concentrate
2O
3Steam, this ash-laden gas is handled by the unit that gathers dust, the end of unit of gathering dust connects tail gas treating unit, and the described unit that gathers dust successively comprises: first filtrating equipment of flue gas, and it has first filtering material that filters for the ash-laden gas to be filtered that temperature is in 460～900 ℃; Second filtrating equipment of flue gas, it has second filtering material that filters for the ash-laden gas to be filtered that temperature is in 110～240 ℃; The ash-laden gas filtering accuracy of described first filtering material and second filtering material is 0.05～1 μ m, and at least the first filtering material is to be made of high temperature resistant sintering inorganic porous material.
Can also comprise first refrigerating unit and second refrigerating unit in the calcination process equipment row of above-mentioned tin concentrate, described first refrigerating unit is used for being down to below 580 ℃ the temperature of ash-laden gas and the temperature requirement of satisfied first smoke filtration between stoving oven and first filtrating equipment of flue gas, and described second refrigerating unit is used for the ash-laden gas temperature is down to the requirement of satisfying second smoke filtration between first filtrating equipment of flue gas and second filtrating equipment of flue gas; At least the first refrigerating unit is waste heat boiler in first refrigerating unit and second refrigerating unit.
In the calcination process equipment row of above-mentioned tin concentrate, the temperature in of described first filtrating equipment of flue gas also can be for more than 680 ℃; Be provided with the waste heat boiler that satisfies the second smoke filtration requirement for the ash-laden gas temperature is down between first filtrating equipment of flue gas and second filtrating equipment of flue gas.
In the calcination process equipment row of above-mentioned tin concentrate, described tail gas treating unit comprises the equipment that carries out tail gas desulfurization processing.
Above-mentioned tin concentrate calcination process technology is smelted the different of arsenic compound and sn-containing compound boiling point in the high temperature dust flue gas based on tin equally, and when the temperature of tin smelting high temperature dust flue gas was in 460～900 ℃, arsenic was with As
2O
3The form of steam exists, and sn-containing compound is solid-state, at this moment, after filtering by first filtering material, the stanniferous dust is removed substantially in the flue gas, obtains the dust of high tin content, and has realized the high efficiency separation of tin, arsenic; When the temperature of ash-laden gas is in 110～240 ℃, As
2O
3Steam changes As into
2O
3At this moment the solid state crystallization body, after the filtration of second filtering material, can obtain the dust of high arsenic content.Like this, the dust of high tin content is returned in the tin smelting flow process, tin is used more effectively, and the dust of high arsenic content is discharged from tin smelting flow process, avoid tin to smelt the circulative accumulation of arsenic in the flow process, while can directly be used as Industrial products owing to arsenic grade in the dust of the high arsenic content of gained is higher.
Three, about the high temperature dust flue gas purification system in the tin smelting of the present invention
High temperature dust flue gas purification system during tin of the present invention is smelted, comprise the unit that gathers dust of series connection successively, cooling unit and tail gas treating unit, the described unit that gathers dust is connected with the Industrial Stoves that tin is smelted in the flow process, the low arsenic content high temperature dust flue gas (for example the fuming furnace sulfiding volatilization mentioned of background technology produce low arsenic content high temperature dust flue gas) that is used for described Industrial Stoves discharging is handled, the described unit that gathers dust comprises filtrating equipment of flue gas, this filtrating equipment of flue gas directly or by mechanical dust collector is connected with Industrial Stoves and temperature in is below 900 ℃, filtering material in the described filtrating equipment of flue gas is to be made of high temperature resistant sintering inorganic porous material, and this material is 0.05～1 μ m to the filtering accuracy of ash-laden gas.
In the high temperature dust flue gas purification system during above-mentioned tin is smelted, described filtering material is preferably by sintering FeAl base intermetallic compound porous material or sintering Fe
3Al base intermetallic compound porous material constitutes.
In the high temperature dust flue gas purification system during above-mentioned tin is smelted, described filtering material is preferably 0.3～0.8 μ m to the filtering accuracy of ash-laden gas.
In the high temperature dust flue gas purification system during above-mentioned tin is smelted, described cooling unit is preferably waste heat boiler.
In the high temperature dust flue gas purification system during above-mentioned tin is smelted, described tail gas treating unit comprises the equipment that carries out tail gas desulfurization processing.
Because the high temperature dust flue gas purification system during above-mentioned tin is smelted is only handled at the low arsenic content high temperature dust flue gas of Industrial Stoves discharging, therefore the link of special recovery arsenic is not set in the unit that gathers dust, and only be provided with the one-level filtrating equipment of flue gas, so its technical process shortens dramatically.Certainly, for the low arsenic content high temperature dust flue gas in this tin smelting, still can adopt the high temperature dust flue gas purifying technique in the tin smelting that provides previously to handle.
High temperature dust flue gas purification system during another kind of tin of the present invention is smelted, comprise the cooling unit of series connection successively, unit and tail gas treating unit gather dust, the Industrial Stoves that the described unit that gathers dust smelts in the flow process by cooling unit and tin are connected, be used for the ash-laden gas of described Industrial Stoves discharging is handled, the described unit that gathers dust comprises filtrating equipment of flue gas, this filtrating equipment of flue gas directly or by mechanical dust collector is connected with cooling unit and temperature in is 110～240 ℃, filtering material in the described filtrating equipment of flue gas is to be made of the sintering inorganic porous material, and this material is 0.05～1 μ m to the filtering accuracy of ash-laden gas.
In the high temperature dust flue gas purification system during above-mentioned tin is smelted, described filtering material is preferably by sintering FeAl base intermetallic compound porous material or sintering Fe
3Al base intermetallic compound porous material constitutes.
In the high temperature dust flue gas purification system during above-mentioned tin is smelted, described filtering material is preferably 0.3～0.8 μ m to the filtering accuracy of ash-laden gas.
In the high temperature dust flue gas purification system during above-mentioned tin is smelted, described cooling unit is preferably waste heat boiler.
In the high temperature dust flue gas purification system during above-mentioned tin is smelted, described tail gas treating unit comprises the equipment that carries out tail gas desulfurization processing.
The technical process length of the high temperature dust flue gas purification system during above-mentioned tin is smelted is identical substantially with the high temperature dust flue gas purification system of front, and just the position of cooling unit and filtrating equipment of flue gas is changed.Thereby this high temperature dust flue gas purification system has the short characteristics of technical process equally.In addition, this high temperature dust flue gas purification system not only can be handled the low arsenic content high temperature dust flue gas of Industrial Stoves discharging, also can handle high arsenic content high temperature dust flue gas.
The present invention is described further below in conjunction with the drawings and specific embodiments.The aspect that the present invention adds and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Fig. 1 is the process flow sheet of the embodiment of the invention 1.
Fig. 2 is the process flow sheet of the embodiment of the invention 2.
Fig. 3 is the process flow sheet of the embodiment of the invention 3.
Fig. 4 is the process flow sheet of the embodiment of the invention 4.
The filtration efficiency, filtration pressure difference when filtering tin and smelt the high temperature dust flue gas that Fig. 5 finds for the contriver selected the foundation of filtration of material precision to the change curve of filtering accuracy in order to show the present invention.
Fig. 6 selects the foundation of filtration of material precision to the change curve of filtering accuracy in order to show the present invention for the material regeneration ability when filtering tin smelting high temperature dust flue gas that the contriver finds.
Embodiment
Embodiment 1: the boiling roaster treatment process of tin concentrate reaches the purification at boiling roaster high temperature dust flue gas
As shown in Figure 1, obtain calcining and high temperature dust flue gas respectively by boiling roaster, the temperature of this ash-laden gas is roughly 800～900 ℃, wherein contains the As that most of arsenic generates through oxidizing roasting in the former tin concentrate
2O
3Steam and a large amount of stanniferous dust (are mainly SnO
2Particle); This ash-laden gas at first is admitted in the waste heat boiler 1 cool (can certainly carry out the rough dusting processing by mechanical dust collector earlier and send into waste heat boiler 1 again), the resulting temperature that cools is that 480～500 ℃ ash-laden gas is admitted in first filtrating equipment of flue gas 2 again, first filtering material in this first filtrating equipment of flue gas 2 adopts sintering FeAl base intermetallic compound porous material, its the highest can use in the high-temperature atmosphere about 900 ℃, and its ash-laden gas filtering accuracy is 0.75 μ m; After 2 filtrations of first filtrating equipment of flue gas, stanniferous dust in the former ash-laden gas more than 99% is removed, thereby the bottom at first filtrating equipment of flue gas 2 deposits the dust that obtains high tin content, and first filtrating equipment of flue gas, 2 discharged flue gas enter second refrigerating unit again; Second refrigerating unit both can use waste heat boiler, also can use surface cooler 3, and the ash-laden gas temperature of its discharging is 180～200 ℃, at this moment, and the As in the ash-laden gas
2O
3Steam has fully changed the solid state crystallization body into, and enters subsequently in second filtrating equipment of flue gas 4 and filter; Second filtering material in second filtrating equipment of flue gas 4 adopts the sintered ceramic porous material, its ash-laden gas filtering accuracy 0.5 μ m, the arsenic powder dirt that contains more than 99% in the ash-laden gas can be removed, thereby deposit the dust that obtains high arsenic content in the bottom of second filtrating equipment of flue gas 4; The tail gas of second filtrating equipment of flue gas 4 enters follow-up tail gas treating unit, adopts milk of lime absorption SO wherein
2Or produce sulfuric acid by washing, the residual air after the processing is directly discharged; The dust that reclaims the high tin content that obtains from first filtrating equipment of flue gas 2 returns calcination steps, or with the raw material of described calcining as follow-up retailoring operation; Reclaiming the dust of the high arsenic content that obtains from second filtrating equipment of flue gas 4 discharges from tin smelting flow process.
Embodiment 2: the boiling roaster treatment process of tin concentrate reaches the purification at boiling roaster high temperature dust flue gas
As shown in Figure 2, obtain calcining and high temperature dust flue gas respectively by boiling roaster, the temperature of this ash-laden gas is roughly 800～900 ℃, wherein contains the As that most of arsenic generates through oxidizing roasting in the former tin concentrate
2O
3Steam and a large amount of stanniferous dust (are mainly SnO
2Particle); This ash-laden gas at first directly is admitted in first filtrating equipment of flue gas 2 and (can certainly carries out the rough dusting processing by mechanical dust collector earlier and send into first filtrating equipment of flue gas again), first filtering material in this first filtrating equipment of flue gas 2 adopts sintering FeAl base intermetallic compound porous material, its the highest can use in the high-temperature atmosphere about 900 ℃, and its ash-laden gas filtering accuracy is 0.8 μ m; After 2 filtrations of first filtrating equipment of flue gas, stanniferous dust in the former ash-laden gas more than 99% is removed, thereby obtain the dust of high tin content in the bottom of first filtrating equipment of flue gas 2 deposition, first filtrating equipment of flue gas, 2 discharged flue gas enter in the waste heat boiler 5 again and cool, and the resulting temperature that cools is that 180～200 ℃ ash-laden gas enters in second filtrating equipment of flue gas 4 and filters; Second filtering material in second filtrating equipment of flue gas 4 adopts cloth bag, and its ash-laden gas filtering accuracy 1.0 μ m can remove about 97% the arsenic powder dirt that contains in the ash-laden gas, thereby obtains the dust of high arsenic content in the bottom of second filtrating equipment of flue gas 4 deposition; The tail gas of second filtrating equipment of flue gas 4 enters follow-up tail gas treating unit, adopts milk of lime absorption SO wherein
2Or produce sulfuric acid by washing, the residual air after the processing is directly discharged; The dust that reclaims the high tin content that obtains from first filtrating equipment of flue gas 2 returns calcination steps, or with the raw material of described calcining as follow-up retailoring operation; Reclaiming the dust of the high arsenic content that obtains from second filtrating equipment of flue gas 4 discharges from tin smelting flow process.
By can finding the contrast of embodiment 1 and embodiment 2,2 of embodiment have carried out once cooling specially by waste heat boiler 5, and therefore, the technical process of embodiment 2 can be shorter than embodiment 1.Even more important difference be, first filtrating equipment of flue gas 2 of embodiment 1 is to be that 480～500 ℃ ash-laden gas filters to temperature, first filtrating equipment of flue gas 2 of embodiment 2 is to be that ash-laden gas about 800 ℃ filters to temperature, therefore, in fact, the high temperature filtration performance of first filtering material has higher requirement in 2 pairs of first filtrating equipment of flue gas 2 of embodiment.Though the high temperature filtration performance requriements to first filtering material is higher, the UTILIZATION OF VESIDUAL HEAT IN efficient of embodiment 2 also can be higher than embodiment 1.Therefore, if the high temperature filtration performance of first filtering material guarantees that to some extent then the mode of embodiment 2 is adopted in suggestion, with shortened process and reach higher utilization rate of waste heat; If the high temperature filtration performance of first filtering material is limited, then the mode of embodiment 1 is adopted in suggestion.
That Fig. 5, Fig. 6 find for the contriver, smelt in the high temperature dust smoke filtration at tin, filtration efficiency, filtration pressure difference and material regeneration ability are to the change curve of filtration of material precision.Wherein, the material regeneration ability characterizes with the ability recovery rate that sees through of material.Study above-mentioned first smoke filtration, during the mechanism of in second smoke filtration fluidizing furnace ash-laden gas being filtered (tin smelt in other Industrial Stoves the ash-laden gas characteristic and the flue gas that produce very similar), the contriver finds: as shown in Figure 5, no matter be first smoke filtration or second smoke filtration, when the ash-laden gas filtering accuracy of material is 0.05 μ m, filtration pressure difference is in the normal index of 0.25～0.26Mp, and when the ash-laden gas filtering accuracy of material continues to dwindle, filtration pressure difference is unexpected sharply to be increased, and the ash-laden gas filtering accuracy of working as material increases to the process of 1.1 μ m from 0.05 μ m, and filtration pressure difference is decreased in the better interval of 0.1～0.15Mpa gradually; For filtration efficiency, as shown in Figure 5, when the ash-laden gas filtering accuracy of material increases to 1.0 μ m from 0.05 μ m, the faint decline of filtration efficiency, and when the ash-laden gas filtering accuracy continued to increase from 1.0 μ m, filtration efficiency sharply descended suddenly, showed to wear the unexpected Ceng Qiang of filter phenomenon; For seeing through the ability recovery rate, as shown in Figure 6, when the ash-laden gas filtering accuracy of material increases to 0.8 μ m from 0.05 μ m, see through the faint decline of ability recovery rate, but remain at more than 93%, when the ash-laden gas filtering accuracy continues to increase from 0.8 μ m, see through the ability recovery rate and sharply descend suddenly, when reaching 1.0 μ m, the ash-laden gas filtering accuracy drops to about 90%.According to above-mentioned phenomenon, determine the ash-laden gas filtering accuracy of first filtering material and second filtering material is made as 0.05～1 μ m, but be preferably 0.3～0.8 μ m.
Embodiment 3: the purification system of the rich slag fuming furnace volatilization of tin high temperature dust flue gas
As shown in Figure 3, purification system comprises the unit that gathers dust, cooling unit and the tail gas treating unit of series connection successively, the described unit that gathers dust is connected with fuming furnace, be used for the low arsenic content high temperature dust flue gas of described fuming furnace discharging is handled, the described unit that gathers dust comprises filtrating equipment of flue gas 6, this filtrating equipment of flue gas 6 directly is connected with fuming furnace and temperature in is below 900 ℃, filtering material in the described filtrating equipment of flue gas 6 is to be made of sintering FeAl base intermetallic compound porous material, and this material is 0.5 μ m to the filtering accuracy of ash-laden gas.Wherein, described cooling unit adopts waste heat boiler 7.Described tail gas treating unit comprises the equipment that carries out tail gas desulfurization processing equally.
Embodiment 4: the purification system of the rich slag fuming furnace volatilization of tin high temperature dust flue gas
As shown in Figure 4, purification system comprise series connection successively cooling unit, unit and tail gas treating unit gather dust, the described unit that gathers dust is connected with fuming furnace by cooling unit, be used for the ash-laden gas of described fuming furnace discharging is handled, the described unit that gathers dust comprises filtrating equipment of flue gas 6, this filtrating equipment of flue gas 6 directly is connected with cooling unit and temperature in is 180～200 ℃, and the filtering material in the described filtrating equipment of flue gas 6 specifically is by sintering Fe
3Al base intermetallic compound porous material constitutes, and this material is 0.1 μ m to the filtering accuracy of ash-laden gas.Wherein, described cooling unit is waste heat boiler 7.Described tail gas treating unit comprises the equipment that carries out tail gas desulfurization processing.
Claims (12)
1. the calcination process technology of tin concentrate, this technology can realize the high efficiency separation to arsenic in the tin roasted ore, it step that comprises is: one, the tin concentrate is carried out roasting, obtain calcining and ash-laden gas respectively, contain the As that most of arsenic generates through oxidizing roasting in the former tin concentrate in this ash-laden gas
2O
3Steam; Two, first smoke filtration and second smoke filtration that successively described ash-laden gas is carried out: in first smoke filtration, temperature is in 460～900 ℃ ash-laden gas to be filtered by first filtering material; In second smoke filtration, temperature is in 110～240 ℃ ash-laden gas to be filtered by second filtering material; The ash-laden gas filtering accuracy of described first filtering material and second filtering material is 0.05～1 μ m, and at least the first filtering material is to be made of high temperature resistant sintering inorganic porous material; Three, will from first smoke filtration, reclaim the dust that obtains and return calcination steps, or with the raw material of described calcining as follow-up retailoring operation; To reclaim the dust of the enrichment arsenic that obtains and discharge from tin smelting flow process from second smoke filtration, the tail gas behind second smoke filtration enters follow-up vent gas treatment.
2. the calcination process technology of tin concentrate as claimed in claim 1 is characterized in that: before carrying out first smoke filtration, be down to below 580 ℃ the temperature of ash-laden gas and the temperature requirement of satisfied first smoke filtration by first refrigerating unit earlier; Before carrying out second smoke filtration, the ash-laden gas temperature is down to the requirement of satisfying second smoke filtration by second refrigerating unit earlier.
3. the calcination process technology of tin concentrate as claimed in claim 1, it is characterized in that: directly be that ash-laden gas more than 680 ℃ carries out first smoke filtration with temperature, be down to the requirement of satisfying second smoke filtration by the exhaust temperature of refrigerating unit after with first smoke filtration then, again the ash-laden gas after cooling carried out second smoke filtration.
4. the calcination process technology of tin concentrate as claimed in claim 1, it is characterized in that: at least the first filtering material is by sintering FeAl base intermetallic compound porous material or sintering Fe in described first filtering material and second filtering material
3Al base intermetallic compound porous material constitutes.
5. the calcination process technology of tin concentrate as claimed in claim 1, it is characterized in that: the ash-laden gas filtering accuracy of described first filtering material and second filtering material is all at 0.3～0.8 μ m.
6. the calcination process technology of tin concentrate as claimed in claim 1 is characterized in that: described second filtering material is made of the sintering inorganic porous material or adopts cloth bag.
7. the calcination process technology of tin concentrate as claimed in claim 1 is characterized in that: in described second smoke filtration, the temperature of ash-laden gas to be filtered is controlled below 200 ℃.
8. the calcination process technology of tin concentrate as claimed in claim 1 is characterized in that: described vent gas treatment comprises that desulfurization handles.
9. the calcination process equipment of tin concentrate row comprise stoving oven and the unit that gathers dust that is connected with stoving oven, contain the As that most of arsenic generates through oxidizing roasting in the former tin concentrate from the ash-laden gas of described stoving oven discharging
2O
3Steam, this ash-laden gas is handled by the unit that gathers dust, the end of unit of gathering dust connects tail gas treating unit, it is characterized in that, the described unit that gathers dust successively comprises: first filtrating equipment of flue gas (2), and it has first filtering material that filters for the ash-laden gas to be filtered that temperature is in 460～900 ℃; Second filtrating equipment of flue gas (4), it has second filtering material that filters for the ash-laden gas to be filtered that temperature is in 110～240 ℃; The ash-laden gas filtering accuracy of described first filtering material and second filtering material is 0.05～1 μ m, and at least the first filtering material is to be made of high temperature resistant sintering inorganic porous material.
10. the calcination process equipment of tin concentrate as claimed in claim 9 is listed as, it is characterized in that: comprise first refrigerating unit and second refrigerating unit, described first refrigerating unit is positioned at and is used between stoving oven and first filtrating equipment of flue gas (2) being down to below 580 ℃ the temperature of ash-laden gas and the temperature requirement of satisfied first smoke filtration, and described second refrigerating unit is positioned at and is used between first filtrating equipment of flue gas (2) and second filtrating equipment of flue gas (4) the ash-laden gas temperature is down to the requirement of satisfying second smoke filtration; At least the first refrigerating unit is waste heat boiler (1) in first refrigerating unit and second refrigerating unit.
11. the calcination process equipment of tin concentrate as claimed in claim 9 row, it is characterized in that: the temperature in of described first filtrating equipment of flue gas (2) is more than 680 ℃; Be provided with the waste heat boiler (5) that satisfies the second smoke filtration requirement for the ash-laden gas temperature is down between first filtrating equipment of flue gas (2) and second filtrating equipment of flue gas (4).
12. the calcination process equipment of tin concentrate as claimed in claim 9 row is characterized in that: described tail gas treating unit comprises the equipment that carries out tail gas desulfurization processing.
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| CN103725900A (en) * | 2013-12-27 | 2014-04-16 | 灌阳县贵达有色金属有限公司 | Method for removing arsenic and sulfur from tin concentrate |
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| CN105018731A (en) * | 2014-04-30 | 2015-11-04 | 成都易态科技有限公司 | Lead anodic slime smelting dust gasification and hierarchical temperature-control recovery process |
| CN114836617A (en) * | 2022-04-20 | 2022-08-02 | 柳州华锡有色设计研究院有限责任公司 | Method for efficiently smelting high-sulfur high-arsenic tin concentrate |
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| WO2014176925A1 (en) * | 2013-04-29 | 2014-11-06 | 成都易态科技有限公司 | Purifying process and special equipment set for high-temperature dust-laden flue gas in tin smelting |
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| CN105018731A (en) * | 2014-04-30 | 2015-11-04 | 成都易态科技有限公司 | Lead anodic slime smelting dust gasification and hierarchical temperature-control recovery process |
| CN114836617A (en) * | 2022-04-20 | 2022-08-02 | 柳州华锡有色设计研究院有限责任公司 | Method for efficiently smelting high-sulfur high-arsenic tin concentrate |
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