WO2002042502B1 - Method and equipment for handling dross and recovering the non-ferrous metals contained therein - Google Patents
Method and equipment for handling dross and recovering the non-ferrous metals contained thereinInfo
- Publication number
- WO2002042502B1 WO2002042502B1 PCT/BR2001/000142 BR0100142W WO0242502B1 WO 2002042502 B1 WO2002042502 B1 WO 2002042502B1 BR 0100142 W BR0100142 W BR 0100142W WO 0242502 B1 WO0242502 B1 WO 0242502B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- dross
- recipient
- metal
- equipment
- powder
- Prior art date
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract 29
- 239000002184 metal Substances 0.000 title claims abstract 29
- 238000000034 method Methods 0.000 title claims abstract 14
- -1 ferrous metals Chemical class 0.000 title abstract 3
- 239000011261 inert gas Substances 0.000 claims abstract 4
- 238000011084 recovery Methods 0.000 claims abstract 4
- 238000000926 separation method Methods 0.000 claims abstract 4
- 238000002347 injection Methods 0.000 claims abstract 3
- 239000007924 injection Substances 0.000 claims abstract 3
- 238000002844 melting Methods 0.000 claims abstract 3
- 230000008018 melting Effects 0.000 claims abstract 3
- 239000007788 liquid Substances 0.000 claims abstract 2
- 239000000843 powder Substances 0.000 claims 12
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 6
- 239000001301 oxygen Substances 0.000 claims 6
- 229910052760 oxygen Inorganic materials 0.000 claims 6
- 238000006243 chemical reaction Methods 0.000 claims 5
- 238000001816 cooling Methods 0.000 claims 4
- 238000010521 absorption reaction Methods 0.000 claims 2
- 239000004411 aluminium Substances 0.000 claims 2
- 229910052782 aluminium Inorganic materials 0.000 claims 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 2
- 239000004482 other powder Substances 0.000 claims 2
- 229910001338 liquidmetal Inorganic materials 0.000 claims 1
- 230000001737 promoting effect Effects 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- 238000009825 accumulation Methods 0.000 abstract 1
- 238000013019 agitation Methods 0.000 abstract 1
- 238000004320 controlled atmosphere Methods 0.000 abstract 1
- 238000009413 insulation Methods 0.000 abstract 1
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
- C22B7/004—Dry processes separating two or more metals by melting out (liquation), i.e. heating above the temperature of the lower melting metal component(s); by fractional crystallisation (controlled freezing)
-
- 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
- C22B21/0038—Obtaining aluminium by other processes
- C22B21/0069—Obtaining aluminium by other processes from scrap, skimmings or any secondary source aluminium, e.g. recovery of alloy constituents
-
- 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
- C22B7/04—Working-up slag
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The present invention refers to a method and respective apparatus for the recovery of the free metal present in hot dross which is produced when non-ferrous metals are processed at temperatures above their melting point. The method consists of charging the hot dross collected from the liquid bath surface of holding or melting furnaces, directly into an equipment provided with thermal insulation and means for control of its internal atmosphere. This operation is followed by the transportation of such an equipment to a processing unit located not far from the site were the dross has been generated. The processing unit being provided with transfer devices and one or more sealed rotary furnaces provided with controlled atmosphere, which work in the accumulation and agitation of the dross, and the subsequent separation of the free metal contained therein. The equipment used in the recovery of non-ferrous metals present in dross, object of the present invention, consists of a recipient provided with thermally insulated walls, and a cover also thermally insulated that is well adjusted to the body of the recipient, and is provided with an inert gas injection port, a lifting and transfer device for removing the dross from the recipient into a feeding device well adjusted to the door of a sealed furnace that acts both as a dross accumulator and in the free metal separation from dross.
Claims
1. A method and equipment for treating non-ferrous metal dross containing recoverable metal, in order to reclaim the said metal in dross processing units containing one or more dross treating furnaces which are provided with external heat source, the said method being characterised by the following steps: (i) collecting the dross (5) immediately after it is removed from the source wherein it was generated, while the dross is still hot, directly into a non-rotated and non-agitated collection recipient (3) which is sealed to substantially prevent the entrance of atmospheric air into its cavity, thereby preventing substantial loss of metal which might otherwise occur as a consequence of exothermic reaction between the metal and oxygen from air, and thermally insulated to substantially preserve the heat content of the hot dross, while the dross (5) is held in the collection recipient; (ii) being the collection recipient (3) totally or partially loaded, temporally storing or immediately transporting the recipient to a dross processing unit that contains one or more rotary furnaces (6) in order to promote the separation of the recoverable metal from dross (5); (iii) transferring the hot dross (5) into a processing furnace (6) which accumulates a large enough amount of dross and in which any necessary dross temperature adjustment to a temperature level above the melting point of the recoverable metal can be carried out using an external heat source; (iv) promoting the separation of recoverable metal from the dross (5) as a liquid bath at the bottom of the furnace (6); (v) removing the liquid metal from the processing furnace (6); and (vi) removing the solid non-metallic residues remaining in the processing furnace (6) which is in this way made available for accumulating and treating new loads of hot dross.
2. A method and equipment for treating dross of non-ferrous metal, characterised by the equipment used for the collection of hot dross (5) immediately after it is removed from the source wherein it was generated to be a non-agitated and non-rotated recipient provided with thermally insulated side walls (20), internally inclined at an angle (α) greater than 90° with respect to the bottom (33) of the recipient, and closed with a top cover (23) to substantially preserve the heat content of the hot dross, and having, when closed, the top cover borders immersed into a powder seal box (31) to substantially prevent surrounding air, and therefore oxygen, to enter the recipient, thereby substantially preventing exothermic reactions to occur which might consume part or the total of the recoverable metal present in the hot dross.
3. A method and equipment for treating dross of non-ferrous metal according to claim 1 or 2, characterised by the top cover (23) to contain one or more inert gas injection ports (27); the inert gas being fed into the recipient in order to promote a slightly positive pressure in order to prevent surrounding air, and therefore oxygen, to penetrate in the cavity of the recipient, thereby avoiding exothermic reactions to occur which might consume part or the total of the recoverable metal present in the hot dross. 9 -
4. A method and equipment for treating dross of non-ferrous metal according to claims 2 or 3, characterised by the powder used in the powder seal box (31) of the recipient (3) to be composed by an oxide of the metal being processed, like aluminium oxide powder in case of recovering aluminium from dross, or a fine powder extracted from the non- metallic residues (9) resulting from the metal recovery process, or by any other powder which might be convenient for the process, as for example a powder which presents capacity for oxygen absorption.
5. A method and equipment for treating dross of non-ferrous metal according to claims 1 or 2, characterised by the equipment used for the collection of the hot dross to be provided with guiding holes (21) for lif ing and transportation by an appropriate vehicle or equivalent means, or, alternatively, provided with wheels (32) for free movement over the floor, or guided movement over rails, and with supports (22) for lifting and unloading the dross (5) directly into the interior of a rotary furnace (6), or over any ancillary transfer device (7); and handles (30), which may include or not pivots (25) and counterweights (26) on the thermally insulated top cover (23).
6. A method and equipment for collecting and cooling dross of -non-ferrous metal, containing recoverable metal, in order to promote a quiescent cooling of the dross, which is characterised by: (i) the equipment used for the collection of hot dross (5) immediately after it is removed from the source wherein it was generated to be a non- .agitated .and non-rotated recipient provided with side walls (2) w ch^re internally inclined at an angle (α) greater than 90° with respect to the bottom of the recipient, and a top cover (23) that when closed have its borders immersed into a powder seal box (31) to substantially prevent surrounding air, and therefore oxygen, to enter the recipient, thereby substantially preventing exothermic reactions to occur which might consume part or the total of the recoverable metal present in the dross; and (ii) being the collection recipient (3) totally or partially loaded, temporally storing the recipient (3) at least until the temperature of the dross (5) has reached a low enough value for self-propagating exothermic reactions not to occur.
7. A method and equipment for collecting and cooling dross of non-ferrous metal according to claim 6, characterised by the top cover (23) to contain one or more inert gas injection ports (27).
8. A method and equipment for collecting and cooling dross of non-ferrous metal according to claim 6 or 7, characterised by the powder used in the powder seal box (31) of the recipient (3) to be composed by an oxide of the metal being processed, like aluminium oxide powder in case of recovering aluminium from dross, or a fine powder extracted from the non-metallic residues (9) resulting from the metal recovery process, or by any other powder which might be convenient for the process, as for example a powder which presents capacity for oxygen absorption.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2002223314A AU2002223314A1 (en) | 2000-11-21 | 2001-11-21 | Method and equipment for handling dross and recovering the non-ferrous metals contained therein |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BR0013444A BR0013444A (en) | 2000-11-21 | 2000-11-21 | Process and equipment for the recovery of non-ferrous metals carried in lees and slag |
| BRPI0013444-9 | 2000-11-21 |
Publications (4)
| Publication Number | Publication Date |
|---|---|
| WO2002042502A2 WO2002042502A2 (en) | 2002-05-30 |
| WO2002042502A3 WO2002042502A3 (en) | 2002-10-03 |
| WO2002042502B1 true WO2002042502B1 (en) | 2002-12-27 |
| WO2002042502A8 WO2002042502A8 (en) | 2003-02-20 |
Family
ID=3946444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/BR2001/000142 WO2002042502A2 (en) | 2000-11-21 | 2001-11-21 | Method and equipment for handling dross and recovering the non-ferrous metals contained therein |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU2002223314A1 (en) |
| BR (1) | BR0013444A (en) |
| WO (1) | WO2002042502A2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2852984A1 (en) * | 2011-10-18 | 2013-04-25 | Pyrogenesis Canada Inc. | Energy efficient salt-free recovery of metal from dross |
| CN108085241B (en) * | 2018-01-25 | 2024-02-06 | 吉林冠界生物技术有限公司 | Powder material adding device and tank containing same |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2481591A (en) * | 1947-09-05 | 1949-09-13 | Aluminum Co Of America | Treatment of aluminous dross |
| US3043678A (en) * | 1959-08-12 | 1962-07-10 | Kaiser Aluminium Chem Corp | Reclamation of metallic values from aluminous dross |
| JPS59190305A (en) * | 1983-03-31 | 1984-10-29 | Nippon Steel Chem Co Ltd | Pot car for carrying melt |
| CA2168685C (en) * | 1996-02-02 | 2000-06-20 | Gordon H. Woodhouse | Method and apparatus for supplying molten metal |
| EP0894151B1 (en) * | 1996-04-15 | 2000-02-09 | Pyrogenesis Inc. | Recovery of metal from dross |
-
2000
- 2000-11-21 BR BR0013444A patent/BR0013444A/en not_active Application Discontinuation
-
2001
- 2001-11-21 AU AU2002223314A patent/AU2002223314A1/en not_active Abandoned
- 2001-11-21 WO PCT/BR2001/000142 patent/WO2002042502A2/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| WO2002042502A3 (en) | 2002-10-03 |
| AU2002223314A1 (en) | 2002-06-03 |
| WO2002042502A8 (en) | 2003-02-20 |
| BR0013444A (en) | 2002-06-25 |
| WO2002042502A2 (en) | 2002-05-30 |
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