WO1991015607A1 - Rotary melting furnace - Google Patents

Rotary melting furnace Download PDF

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Publication number
WO1991015607A1
WO1991015607A1 PCT/GB1991/000504 GB9100504W WO9115607A1 WO 1991015607 A1 WO1991015607 A1 WO 1991015607A1 GB 9100504 W GB9100504 W GB 9100504W WO 9115607 A1 WO9115607 A1 WO 9115607A1
Authority
WO
WIPO (PCT)
Prior art keywords
furnace
rotary melting
melting furnace
aluminium
balls
Prior art date
Application number
PCT/GB1991/000504
Other languages
French (fr)
Inventor
Adrianus Jacobus Hengelmolen
Original Assignee
Copermill Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Copermill Limited filed Critical Copermill Limited
Publication of WO1991015607A1 publication Critical patent/WO1991015607A1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/001—Dry processes
    • C22B7/003—Dry processes only remelting, e.g. of chips, borings, turnings; apparatus used therefor
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00—Obtaining aluminium
    • C22B21/0084—Obtaining aluminium melting and handling molten aluminium
    • C22B21/0092—Remelting scrap, skimmings or any secondary source aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/14—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge
    • F27B7/18—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge the means being movable within the drum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/2083—Arrangements for the melting of metals or the treatment of molten metals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to rotary melting furnaces and more particularly to a rotary melting furnace for extraction of aluminium and its alloys from, for example, aluminium dross, metallics, turnings and chips of aluminium hereinafter referred to as dross (these are further defined in our co-pending British Patent Application No 9025759.3)
  • a problem which exists with melting of small pieces of aluminium is that they are always covered with a strong layer of oxide and with small pieces, the strong oxide layer prevents liquid aluminium contained therein from contacting the other small pieces of liquid aluminium and thereby prevents effective melting even in a molten bath of aluminium. It is an object of the present invention to provide a melting furnace which assists in the extraction of such small pieces of aluminium from dross.
  • the present invention therefore, provides a rotary melting furnace including an inner volume, the inner volume containing a plurality of balls made of a material of higher specific gravity than aluminium.
  • the inner cross section of the furnace is oval.
  • the external cross section of the furnace is circular.
  • Figure 1 shows the rotary melting furnace according to the present invention in diagrammatic longitudinal cross section
  • Figure 2 shows the furnace of figure 1 in cross section along line A-A.
  • Figure 3 shows an alternative design of furnace with supporting rims and Figure 4 shows an alternative inner shape for the furnace.
  • the furnace comprises an outer steel drum 10 mounted for rotation on suitable bearings 12, 14.
  • the steel drum is provided with bearing surfaces or rims 16, 18 supported on roller bearings 20, 22.
  • Roller bearings 22 may be substituted by a suitable drive system such as electric motor 21, and gear box 23 (shown dotted) to cause the drum 10 to rotate at a relatively slow speed eg. f) RPM on roller 22.
  • the drum 10 is provided with an inner lining of material 24 which is heat resistant and also abrasion resistant.
  • the lining 24 is shaped to provide an oval internal cross section.
  • a plurality of balls 26 are provided within the furnace, these balls being preferably made from a ceramic material which is resistant to or not subject to attack by aluminium.
  • the material of the balls 26 is chosen to be of a specific gravity higher than aluminium and can be, for example between 4.0 to 4.2 kilogramms per cubic decimetre, liquid aluminium being approximately 2.35 kilogramms/cubic decimetre.
  • the balls are selected to be relatively large compared with the size of the aluminium dross as defined.
  • the balls are approximately 200 mm in diameter compared with dross and turnings of between 3 to 50mm.
  • the quantity of balls can be adjusted but there must be sufficient to produce a rolling action within the furnace to create a stirring action in the liquid aluminium mixture containing the dross and turnings etc.
  • the outer shape of the drum 10 in Figure 2 is shown as being circular but the drum could be of oval outer shape as shown in Figure 3 to follow the inner shape and allow for constant refractory lining thickness.
  • the drum could have outer circular rims 100 (only one shown) for ease of rotation, the
  • SUBSTITUTESHEET rims being supported as in Figure 1 on bearings 20, 22.
  • the rims are, for example, attached to the furnace shell by stays 102.
  • the internal shape of the furnace could change in a longitudinal direction along the areas of rotation to provide additional mixing action along the length of the furnace.
  • a helical shape could be used.
  • the furnace operates as follows. Liquid aluminium containing dross and turnings is poured into the furnace via inlet 40. Inlet 40 is sealed to the furnace by a gas tight seal 42 and also the opposite end of the furnace 44 is also sealed by suitable means 44. Thus the furnace is gas tight during operation.
  • the liquid aluminium mixture is heated in a conventional furnace such as a closed well furnace (not shown) and a quantity is then tipped or scraped into the furnace.
  • a conventional furnace such as a closed well furnace (not shown) and a quantity is then tipped or scraped into the furnace.
  • SUBSTITUTESHEET pieces contained within the dross/turnings will be "held” by their oxide coatings and will not coalesce into a mass in the closed well furnace.
  • the balls will, by virtue of the shape of the lining move and cause the oxide layer on the outside of the dross/turnings to be broken thereby releasing the small amount of aluminium contained therein. Once released it will coalesce with the other liquid aluminium.
  • the furnace is rotated for a sufficient period to allow this process to be completed and then the furnace rotation is stopped and the furnace is tapped by, for example tapping hole 50 which is "below" the dross level at the time of tapping.
  • the residue/dross can be scraped off at intervals as required, for example by removing seal 44 and inserting a scraper therethrough or by other suitable means.
  • SUBSTITUTESHEET Salt can be added to the mixture in known manner to assist in softening the oxide layer to assist the breakdown of the layers.
  • the amount of salt required will, however, be substantially reduced compared with a conventional melting f rnace.
  • the melting furnace therefore, breaks down small pieces of trapped aluminium to produce liquid aluminium which can be tapped at intervals and can be operated in a continuous manner requiring only infrequent removal of waste material.
  • the fragments are most often covered with a layer of oxide, but also internally there are inclusions and bridges of oxide separating the inclusions of aluminium (alloy) .
  • oxide envelopes and oxide bridges will break up into smaller particulates distributed over the liquid metal in the furnace.
  • the furnace could be charged with liquid metal or with solid metal first, then by applying heat to the furnace charge and by running the furnace at the same time, the break-up process of oxide envelopes, inclusions and bridges can then take place in the furnace.
  • Heat could be applied in a known manner, for example, by replacing seal 44 by a combined seal and burner 45, seal 44 being then stationary. If a burner is used then in a known manner means 46 must be provided for exhaust of waste gases.
  • Such overall processing systems would mainly comprise:
  • a liquid aluminium source and a liquid aluminium transport system to either continually or otherwise feed liquid aluminium into the furnace and to either continually or otherwise draw off liquid aluminium mixed with oxide particulates.

Abstract

A rotary furnace for melting aluminium dross or turnings, etc., the furnace having within it a plurality of balls preferably of ceramic material, which are heavier than aluminium and which assist in breaking down the dross or turnings, etc. to form liquid aluminium.

Description

ROTARY MELTING FURNACE
The present invention relates to rotary melting furnaces and more particularly to a rotary melting furnace for extraction of aluminium and its alloys from, for example, aluminium dross, metallics, turnings and chips of aluminium hereinafter referred to as dross (these are further defined in our co-pending British Patent Application No 9025759.3)
A problem which exists with melting of small pieces of aluminium is that they are always covered with a strong layer of oxide and with small pieces, the strong oxide layer prevents liquid aluminium contained therein from contacting the other small pieces of liquid aluminium and thereby prevents effective melting even in a molten bath of aluminium. It is an object of the present invention to provide a melting furnace which assists in the extraction of such small pieces of aluminium from dross.
The present invention, therefore, provides a rotary melting furnace including an inner volume, the inner volume containing a plurality of balls made of a material of higher specific gravity than aluminium.
Preferably the inner cross section of the furnace is oval. Preferably the external cross section of the furnace is circular.
SUBSTITUTESHEET Embodiments of the present invention will now be described by way of example with reference to the accompanying drawings in which
Figure 1 shows the rotary melting furnace according to the present invention in diagrammatic longitudinal cross section; and
Figure 2 shows the furnace of figure 1 in cross section along line A-A.
Figure 3 shows an alternative design of furnace with supporting rims and Figure 4 shows an alternative inner shape for the furnace.
With reference now to figure 1, the furnace comprises an outer steel drum 10 mounted for rotation on suitable bearings 12, 14. The steel drum is provided with bearing surfaces or rims 16, 18 supported on roller bearings 20, 22. Roller bearings 22 may be substituted by a suitable drive system such as electric motor 21, and gear box 23 (shown dotted) to cause the drum 10 to rotate at a relatively slow speed eg. f) RPM on roller 22. The drum 10 is provided with an inner lining of material 24 which is heat resistant and also abrasion resistant.
SUBSTITUTE SHEET With reference now to figure 2 the lining 24 is shaped to provide an oval internal cross section. A plurality of balls 26 are provided within the furnace, these balls being preferably made from a ceramic material which is resistant to or not subject to attack by aluminium.
The material of the balls 26 is chosen to be of a specific gravity higher than aluminium and can be, for example between 4.0 to 4.2 kilogramms per cubic decimetre, liquid aluminium being approximately 2.35 kilogramms/cubic decimetre.
The balls are selected to be relatively large compared with the size of the aluminium dross as defined. As an example the balls are approximately 200 mm in diameter compared with dross and turnings of between 3 to 50mm.
The quantity of balls can be adjusted but there must be sufficient to produce a rolling action within the furnace to create a stirring action in the liquid aluminium mixture containing the dross and turnings etc.
The outer shape of the drum 10 in Figure 2 is shown as being circular but the drum could be of oval outer shape as shown in Figure 3 to follow the inner shape and allow for constant refractory lining thickness. The drum could have outer circular rims 100 (only one shown) for ease of rotation, the
SUBSTITUTESHEET rims being supported as in Figure 1 on bearings 20, 22. The rims are, for example, attached to the furnace shell by stays 102.
Other suitable internal shapes for the furnace such as a rotary piston cylinder shape as shown in figure 4 may be used, instead of the oval shape. The shape must provide a suitable rolling action for the balls 26. The rim arrangement of Figure 3 could be used with this shape if required or a circular drum as in figure 1.
Alternatively the internal shape of the furnace could change in a longitudinal direction along the areas of rotation to provide additional mixing action along the length of the furnace. For example, a helical shape could be used.
The furnace operates as follows. Liquid aluminium containing dross and turnings is poured into the furnace via inlet 40. Inlet 40 is sealed to the furnace by a gas tight seal 42 and also the opposite end of the furnace 44 is also sealed by suitable means 44. Thus the furnace is gas tight during operation.
The liquid aluminium mixture is heated in a conventional furnace such as a closed well furnace (not shown) and a quantity is then tipped or scraped into the furnace. The small aluminium
SUBSTITUTESHEET pieces contained within the dross/turnings will be "held" by their oxide coatings and will not coalesce into a mass in the closed well furnace.
Once the mixture is in the furnace according to the present invention no further heating is required. The action of the balls is that as the furnace is rotated the balls will, by virtue of the shape of the lining move and cause the oxide layer on the outside of the dross/turnings to be broken thereby releasing the small amount of aluminium contained therein. Once released it will coalesce with the other liquid aluminium.
The furnace is rotated for a sufficient period to allow this process to be completed and then the furnace rotation is stopped and the furnace is tapped by, for example tapping hole 50 which is "below" the dross level at the time of tapping.
A new furnace "load" is then input and the process recommenced.
The residue/dross can be scraped off at intervals as required, for example by removing seal 44 and inserting a scraper therethrough or by other suitable means.
SUBSTITUTESHEET Salt can be added to the mixture in known manner to assist in softening the oxide layer to assist the breakdown of the layers. The amount of salt required will, however, be substantially reduced compared with a conventional melting f rnace.
The melting furnace, therefore, breaks down small pieces of trapped aluminium to produce liquid aluminium which can be tapped at intervals and can be operated in a continuous manner requiring only infrequent removal of waste material.
The fragments are most often covered with a layer of oxide, but also internally there are inclusions and bridges of oxide separating the inclusions of aluminium (alloy) .
During the course of the process the oxide envelopes and oxide bridges will break up into smaller particulates distributed over the liquid metal in the furnace.
Partially it might float on top, partially it might be suspended within liquid metal layer and partially it might sink to the bottom on to the walls of the furnace.
To separate the oxide particulates from the liquid aluminium there will be still further processing needed.
SUBSTITUTESHEET To allow for further processing the mixture of liquid metal and oxide particulates has to be either batchwise or continually removed from the rotary melting furnace.
So, the furnace could be charged with liquid metal or with solid metal first, then by applying heat to the furnace charge and by running the furnace at the same time, the break-up process of oxide envelopes, inclusions and bridges can then take place in the furnace. Heat could be applied in a known manner, for example, by replacing seal 44 by a combined seal and burner 45, seal 44 being then stationary. If a burner is used then in a known manner means 46 must be provided for exhaust of waste gases.
After this the mixture can be tipped or tapped out as said hereinbefore and a new charge can be put in the furnace, etc.
Another way of using the furnace would be by incorporating the furnace into an overall processing system. Such overall processing systems would mainly comprise:
A liquid aluminium source and a liquid aluminium transport system to either continually or otherwise feed liquid aluminium into the furnace and to either continually or otherwise draw off liquid aluminium mixed with oxide particulates.
SUBSTITUTESHEET

Claims

1. A rotary melting furnace including an inner volume, the inner volume containing a plurality of balls made of a material of higher specific gravity than aluminium.
2. A rotary melting furnace as claimed in claim.1 in which the inner cross section of the furnace is non circular.
3. A rotary melting furnace as claimed in claim 2 in which the inner cross section of the furnace is oval.
4. A rotary melting furnace as claimed in claim 1, claim 2 or claim 3 in which the external cross section of the furnace is circular and in which the furnace is cylindrical.
5. A rotary melting furnace as claimed in any one of claims 3 or 4 in which the furnace comprises an outer steel cylindrical drum structure, the drum structure being internally lined with a lining material which is heat resistant and abrasion resistant and in which the lining material is shaped to provide an inner cross section which is oval.
6. A rotary melting furnace as claimed in any one of claims 1 to 5 in which the balls are made of a ceramic material which is resistant to attack by the aluminium.
SUBSTITUTESHEET
7. A rotary melting furnace as claimed in claim 5 in which the ceramic material has a specific gravity of between 4.0 to 4.2 kilogramms per cubic decimetre.
8. A rotary melting furnace as claimed in claim 1 in which the balls are of relatively large diameter in comparison to aluminium dross and turnings.
9. A rotary melting f rnace as claimed in claim 8 in which the balls are approximately 200 mm in diameter.
10. A rotary melting furnace as claimed in any one of the preceding claims including a feed opening at one end of the furnace for continuous feeding of hot aluminium dross into the furnace, the opening being sealed by a gas tight seal.
11. A rotary melting furnace as claimed in claim 4 in which the outer cylindrical surface or rim is supported on roller bearings.
12. A rotary melting furnace as claimed in claim 4 in which the outer cylindrical surface is supported on bearings, one of which is driven to provide rotation of the furnace.
SUBSTITUTESHEET
PCT/GB1991/000504 1990-03-31 1991-04-02 Rotary melting furnace WO1991015607A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9007319A GB9007319D0 (en) 1990-03-31 1990-03-31 Rotary melting furnace
GB9007319.8 1990-03-31

Publications (1)

Publication Number Publication Date
WO1991015607A1 true WO1991015607A1 (en) 1991-10-17

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Country Status (3)

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AU (1) AU7549591A (en)
GB (1) GB9007319D0 (en)
WO (1) WO1991015607A1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2706910A1 (en) * 1993-06-21 1994-12-30 Affimet Process for the recovery of the aluminium present in waste by remelting
EP0646654A1 (en) * 1993-10-01 1995-04-05 Bernd Dipl.-Ing. Kos Method and apparatus for treating mixtures of light metal
WO1997013594A1 (en) * 1995-10-06 1997-04-17 Tox Free Systems Limited Volatile materials treatment system
WO1997016576A1 (en) * 1995-11-02 1997-05-09 Industrikontakt, Ing. O. Ellingsen & Co. Production of metal such as aluminium, magnesium, silicon and the like from metal oxide compounds
EP1217318A1 (en) * 2000-12-19 2002-06-26 Sea Marconi Technologies Di Wander Tumiatti S.A.S. Plant for the thermal treatment of material and operation process thereof
US6485631B1 (en) 1999-02-11 2002-11-26 Ellycrack As Process for thermal, and optionally catalytic, upgrading and hydrogenation of hydrocarbons
US6499536B1 (en) 1997-12-22 2002-12-31 Eureka Oil Asa Method to increase the oil production from an oil reservoir
WO2005031234A1 (en) * 2003-08-30 2005-04-07 Maerz-Gautschi Industrieofenanlagen Gmbh Industrial oven
EP2299222A1 (en) 2009-09-22 2011-03-23 Kumera Oy Counterbalanced metallurgical furnace
CN107478057A (en) * 2016-06-07 2017-12-15 湖南鼎玖能源环境科技有限公司 A kind of outer eccentric swinging type rotary furnace of cylinder

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB689223A (en) * 1950-03-22 1953-03-25 Schmidt Karl Improvements in or relating to a process for melting and treating non-ferrous metalsin rotary furnaces
DE1031473B (en) * 1954-06-16 1958-06-04 Seibel Metallhuettenwerk W Rotary furnace with a non-circular cross-section for melting down metals
DE2146410A1 (en) * 1971-09-16 1973-03-22 Sumitomo Metal Ind Revolving tube melt refining furnace - has non-circular internal cross-section
EP0322207A2 (en) * 1987-12-22 1989-06-28 Alcan International Limited Recovery of non-ferrous metals from dross
JPH02240223A (en) * 1989-03-13 1990-09-25 Wada Sumiko Method for recovering metal and agitating ball used in this method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB689223A (en) * 1950-03-22 1953-03-25 Schmidt Karl Improvements in or relating to a process for melting and treating non-ferrous metalsin rotary furnaces
DE1031473B (en) * 1954-06-16 1958-06-04 Seibel Metallhuettenwerk W Rotary furnace with a non-circular cross-section for melting down metals
DE2146410A1 (en) * 1971-09-16 1973-03-22 Sumitomo Metal Ind Revolving tube melt refining furnace - has non-circular internal cross-section
EP0322207A2 (en) * 1987-12-22 1989-06-28 Alcan International Limited Recovery of non-ferrous metals from dross
JPH02240223A (en) * 1989-03-13 1990-09-25 Wada Sumiko Method for recovering metal and agitating ball used in this method

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2706910A1 (en) * 1993-06-21 1994-12-30 Affimet Process for the recovery of the aluminium present in waste by remelting
EP0646654A1 (en) * 1993-10-01 1995-04-05 Bernd Dipl.-Ing. Kos Method and apparatus for treating mixtures of light metal
AU678512B2 (en) * 1993-10-01 1997-05-29 Bernd Kos Process and device to treat mixtures of light metal
WO1997013594A1 (en) * 1995-10-06 1997-04-17 Tox Free Systems Limited Volatile materials treatment system
WO1997016576A1 (en) * 1995-11-02 1997-05-09 Industrikontakt, Ing. O. Ellingsen & Co. Production of metal such as aluminium, magnesium, silicon and the like from metal oxide compounds
AU710377B2 (en) * 1995-11-02 1999-09-16 Industrikontakt Ing. O. Ellingsen & Co. Production of metal such as aluminium, magnesium, silicon and the like from metal oxide compounds
US6086655A (en) * 1995-11-02 2000-07-11 Industrikontakt, Ing. O Ellingsen & Co. Production of metal such as aluminum, magnesium, silicon from metal oxide compounds
US6499536B1 (en) 1997-12-22 2002-12-31 Eureka Oil Asa Method to increase the oil production from an oil reservoir
US6485631B1 (en) 1999-02-11 2002-11-26 Ellycrack As Process for thermal, and optionally catalytic, upgrading and hydrogenation of hydrocarbons
WO2002050484A1 (en) * 2000-12-19 2002-06-27 Sea Marconi Technologies Di Wander Tumiatti S.A.S. Plant for the thermal treatment of material and operation process thereof
EP1217318A1 (en) * 2000-12-19 2002-06-26 Sea Marconi Technologies Di Wander Tumiatti S.A.S. Plant for the thermal treatment of material and operation process thereof
US6901868B2 (en) 2000-12-19 2005-06-07 Sea Marconi Technologies Di Wander Tumiatti S.A.S. Plant for the thermal treatment of material and operation process thereof
AU2002217122B2 (en) * 2000-12-19 2006-06-15 Sea Marconi Technologies Di Wander Tumiatti S.A.S. Plant for the thermal treatment of material and operation process thereof
WO2005031234A1 (en) * 2003-08-30 2005-04-07 Maerz-Gautschi Industrieofenanlagen Gmbh Industrial oven
JP2007503567A (en) * 2003-08-30 2007-02-22 メルツ−ガウチ・インダストリオフェナンラーゲン・ゲーエムベーハー Industrial furnace
US7846379B2 (en) 2003-08-30 2010-12-07 Andritz Maerz Gmbh Industrial furnace
EP2299222A1 (en) 2009-09-22 2011-03-23 Kumera Oy Counterbalanced metallurgical furnace
CN107478057A (en) * 2016-06-07 2017-12-15 湖南鼎玖能源环境科技有限公司 A kind of outer eccentric swinging type rotary furnace of cylinder
CN107478057B (en) * 2016-06-07 2019-04-19 湖南鼎玖能源环境科技有限公司 A kind of outer eccentric swinging type rotary furnace of cylinder

Also Published As

Publication number Publication date
AU7549591A (en) 1991-10-30
GB9007319D0 (en) 1990-05-30

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