WO2002012594A2 - Treatment process for waste from aluminium production cells - Google Patents
Treatment process for waste from aluminium production cells Download PDFInfo
- Publication number
- WO2002012594A2 WO2002012594A2 PCT/BR2001/000095 BR0100095W WO0212594A2 WO 2002012594 A2 WO2002012594 A2 WO 2002012594A2 BR 0100095 W BR0100095 W BR 0100095W WO 0212594 A2 WO0212594 A2 WO 0212594A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wastes
- cells
- electrolitic
- met
- production
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D3/00—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances
- A62D3/40—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by heating to effect chemical change, e.g. pyrolysis
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/1324—Recycled material, e.g. tile dust, stone waste, spent refractory material
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/1325—Hazardous waste other than combustion residues
-
- 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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Definitions
- This process allows elimination or withdrawal of impurities contained in wastes of electrolytic cells for production of met Al.
- the Al industry uses electrolytic cells lined with refractory material and carbon blocks (amorphous, graphitic, semi graphitic or graphitized). These blocks as well as the isolating materials and ceramic refractories for the cells tend with time to accumulate cyanides and compounds of fluorine, oxygen, sodium, phosphorous, aluminum and hydrogen, as salts, oxides or hydroxides. Such impurities are highly undesirable, some of them are significantly hazardous. After the useful life of these lining products is over, they are removed from the cells and warehoused in special areas classified as class 1 risk for environmental contamination.
- the spent pot liner is used as addictive for slag in the foundries and steel industry, or as additional fuel for cement manufacture or converted to inert material and used as earthwork.
- Fluorides are recuperated through lixiviation, hot hydrolysis, hot sulphatization and as additive to cell anodes manufacture, which process has some disadvantages in the electrolytic cell operation for Al production.
- the present invention features to recover and to refine every basic materials as well as their contaminants through two specific operation: heating the wastes under vacuum and/or heating up wastes in a moving gas atmosphere.
- the cyanides are dissociated and other impurities (fluorides, oxides, hydroxides, sulphides, aluminum, sodium, etc.) contained or impregnated in carbon based materials or ceramic are also set apart.
- the separation is achieved by liquefaction (in a similar way to the melting of metals) as well as by distillation with a simultaneous displacement of the impurities to cooler areas.
- Such movement of the impurities is caused either by gravity force or by the effect of vacuum or the carrier moving gases. Consequently, the carbon products, isolating materials and refractories are rid of their sometimes highly toxic components and can be re-utilized with no environmental risk.
- the impurities withdrawn by the process and placed in cooler areas can also be safely separated and re-utilized.
- the invention is based in the distillation and liquefaction of the impurities on the electrolytic cell wastes in two places at different temperatures.
- One called the distiller and melter is heated in temperatures above 750°C, the other, the condenser and impurity collector is kept at temperatures 10°C minimum below the temps at the distiller and melter, with the temp gradient enough to draw the impurities.
- Carbon blocks or pieces of it and/or other spent pot liner materials are placed at the distiller and melter (1 ).
- the impurities they contained are collected at the condenser and collector (2) already separated either in liquid or solid state. Both systems are interconnected and sealed off by joints and the displacement of impurities is made by the moving gases (inert or non inert i.e. reactive or non reactive to the material being refined.
- Gases which will not react to carbon based products such as nitrogen, argon and reducing gases may be used, however air (with different oxygen level obtained from addition of other gases or the oxygen itself) will show more appropriate performance for refining ceramic materials, it may however be used with carbon products resulting in partial or total oxidation of the material. The displacement and separation of impurities is better achieved in joint with gravity force.
- impurities After impurities are separated they may be set apart from the system in any order, along with the refined material contained in the distiller and melter.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Toxicology (AREA)
- Emergency Management (AREA)
- Business, Economics & Management (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Electrolytic Production Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001276199A AU2001276199A1 (en) | 2000-08-04 | 2001-07-30 | Treatment process for waste from aluminium production cells |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0004425 | 2000-08-04 | ||
BR0004425-3A BR0004425C1 (en) | 2000-08-04 | 2000-08-04 | Refining process of spent electrolytic vat from aluminum metal extraction |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002012594A2 true WO2002012594A2 (en) | 2002-02-14 |
WO2002012594A3 WO2002012594A3 (en) | 2002-08-15 |
Family
ID=3945328
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/BR2001/000095 WO2002012594A2 (en) | 2000-08-04 | 2001-07-30 | Treatment process for waste from aluminium production cells |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2001276199A1 (en) |
BR (1) | BR0004425C1 (en) |
WO (1) | WO2002012594A2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006086868A1 (en) * | 2005-02-16 | 2006-08-24 | Novafrit International Inc. | Process and apparatus for converting spent potliners into a glass frit, and resulting products |
CN106629606A (en) * | 2016-11-07 | 2017-05-10 | 中国铝业股份有限公司 | Method for separating fluoride salt and carbon in aluminum electrolysis carbon residues |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2059403A (en) * | 1979-08-29 | 1981-04-23 | Alcan Res & Dev | Treatment of fluoride- containing waste |
EP0465388A1 (en) * | 1990-07-04 | 1992-01-08 | Aluminium Pechiney | Process for the treatment of spent potlinings from Hall-Heroult electrolytic cells by thermal shock |
US5222448A (en) * | 1992-04-13 | 1993-06-29 | Columbia Ventures Corporation | Plasma torch furnace processing of spent potliner from aluminum smelters |
US5746987A (en) * | 1995-10-18 | 1998-05-05 | Thermall Corp. | Apparatus for physical amd chemical separation and reaction |
-
2000
- 2000-08-04 BR BR0004425-3A patent/BR0004425C1/en not_active Application Discontinuation
-
2001
- 2001-07-30 WO PCT/BR2001/000095 patent/WO2002012594A2/en active Application Filing
- 2001-07-30 AU AU2001276199A patent/AU2001276199A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2059403A (en) * | 1979-08-29 | 1981-04-23 | Alcan Res & Dev | Treatment of fluoride- containing waste |
EP0465388A1 (en) * | 1990-07-04 | 1992-01-08 | Aluminium Pechiney | Process for the treatment of spent potlinings from Hall-Heroult electrolytic cells by thermal shock |
US5222448A (en) * | 1992-04-13 | 1993-06-29 | Columbia Ventures Corporation | Plasma torch furnace processing of spent potliner from aluminum smelters |
US5746987A (en) * | 1995-10-18 | 1998-05-05 | Thermall Corp. | Apparatus for physical amd chemical separation and reaction |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006086868A1 (en) * | 2005-02-16 | 2006-08-24 | Novafrit International Inc. | Process and apparatus for converting spent potliners into a glass frit, and resulting products |
CN106629606A (en) * | 2016-11-07 | 2017-05-10 | 中国铝业股份有限公司 | Method for separating fluoride salt and carbon in aluminum electrolysis carbon residues |
Also Published As
Publication number | Publication date |
---|---|
BR0004425C1 (en) | 2001-08-21 |
BR0004425A (en) | 2001-02-28 |
AU2001276199A1 (en) | 2002-02-18 |
WO2002012594A3 (en) | 2002-08-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
AU659665B2 (en) | Method and system for controlling chemical reaction in a molten bath | |
US5505143A (en) | System for controlling chemical reaction in a molten metal bath | |
CN1251776C (en) | Plasma process for removing hydrocarbons from sludge in petroleum storage cylinder and adaptative apparatus | |
CN1597155A (en) | Method of treating waste matter using plasma electric arc technology and its device | |
CN106498190A (en) | The method of neodymium iron boron greasy filth waste material in-situ carbon thermocatalytic chlorination recovering rare earth product | |
GB2158089A (en) | Treatment of waste plastics | |
CN109371240B (en) | Metal lithium slag recycling equipment and method | |
WO2002012594A2 (en) | Treatment process for waste from aluminium production cells | |
KR19980703226A (en) | Household waste disposal method and apparatus | |
JP2717500B2 (en) | Method and apparatus for recovering glass and metal from solid residue generated in waste incinerator | |
US20040261577A1 (en) | Mechanical separation of volatile metals at high temperatures | |
EP0042509A1 (en) | Mercury recovery process and apparatus | |
US4675048A (en) | Electrothermal process and plant for the separation and refining of metal from waste | |
WO2004035867A2 (en) | Process for treating gaseous emissions generated during production of carbon anodes in an aluminum plant | |
KR20150003073U (en) | APPARATUS FOR DISPOSING Al-PE WASTE MATERIAL BY LOW TEMPERATURE BURNING PROCESS | |
JP3267111B2 (en) | Method and apparatus for treating shredder dust | |
JP4264140B2 (en) | Method and apparatus for gasifying combustibles, residues and waste containing carbon and ash | |
CN210656798U (en) | Low-temperature pyrolysis treatment system for solid organic hazardous waste | |
JP3579283B2 (en) | Equipment and method for recovering phosphorus from waste | |
EP1558790B1 (en) | Process for treating gaseous emissions generated during production of carbon anodes in an aluminum plant | |
NO164253B (en) | TREATMENT OF DUST. | |
KR100582561B1 (en) | A waste carbonizing device | |
JPH06279876A (en) | Treatment of ni-containing waste catalyst for recovering raw material for steel making | |
CN118217727A (en) | Dust collecting system, dust collecting method, valuable material recovery system, and valuable material manufacturing method | |
JPH07108249A (en) | Process and device for treating ash containing dioxin and mercury |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A2 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CR CU CZ DE DK DM DZ EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A2 Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
122 | Ep: pct application non-entry in european phase | ||
NENP | Non-entry into the national phase |
Ref country code: JP |