CA2314123A1 - Method of treating spent potliner material from aluminum reduction cells - Google Patents

Method of treating spent potliner material from aluminum reduction cells Download PDF

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Publication number
CA2314123A1
CA2314123A1 CA002314123A CA2314123A CA2314123A1 CA 2314123 A1 CA2314123 A1 CA 2314123A1 CA 002314123 A CA002314123 A CA 002314123A CA 2314123 A CA2314123 A CA 2314123A CA 2314123 A1 CA2314123 A1 CA 2314123A1
Authority
CA
Canada
Prior art keywords
gas component
aluminum
compounds
sulfate
gas
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA002314123A
Other languages
French (fr)
Other versions
CA2314123C (en
Inventor
Robert J. Barnett
Michael B. Mezner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Goldendale Aluminum Co
Original Assignee
Goldendale Aluminum Company
Robert J. Barnett
Michael B. Mezner
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 Goldendale Aluminum Company, Robert J. Barnett, Michael B. Mezner filed Critical Goldendale Aluminum Company
Priority claimed from PCT/US1997/022650 external-priority patent/WO1999029625A1/en
Publication of CA2314123A1 publication Critical patent/CA2314123A1/en
Application granted granted Critical
Publication of CA2314123C publication Critical patent/CA2314123C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • 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

  • Processing Of Solid Wastes (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

A process for treating spent potliner material from aluminum reduction cells and recovering useful products. In the process, spent potliner material is introduced into an acid digester containing, for example, sulfuric acid.
A gas component is produced which includes hydrogen fluoride and hydrogen cyanide. A slurry component is produced which includes carbon, silica, alumina, sodium compounds such as sodium sulfate, aluminum compounds such as aluminum sulfate, iron compounds such as iron sulfate, magnesium and calcium compounds such as magnesium and calcium sulfate. The slurry component remains in the digester after the gas component is removed. The gas component is recovered and heated an effective amount to convert or decompose the hydrogen cyanide to a remaining gas component including CO2, H2O, and nitrogen oxides, as well as HF gas. The remaining gas component is directed through a water scrubber in which the HF gas is converted to liquid hydrofluoric acid. The hydrofluoric acid is then admixed with alumina trihydrate to form aluminum fluoride and water. Valuable refractory materials and salts are recovered also.
CA 2314123 1997-12-11 1997-12-11 Method of treating spent potliner material from aluminum reduction cells Expired - Fee Related CA2314123C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1997/022650 WO1999029625A1 (en) 1995-12-08 1997-12-11 Method of treating spent potliner material from aluminum reduction cells

Publications (2)

Publication Number Publication Date
CA2314123A1 true CA2314123A1 (en) 1999-06-17
CA2314123C CA2314123C (en) 2006-06-20

Family

ID=22262248

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2314123 Expired - Fee Related CA2314123C (en) 1997-12-11 1997-12-11 Method of treating spent potliner material from aluminum reduction cells

Country Status (2)

Country Link
AU (1) AU749436B2 (en)
CA (1) CA2314123C (en)

Cited By (4)

* Cited by examiner, † Cited by third party
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
CN108926977A (en) * 2018-09-17 2018-12-04 云南云铝润鑫铝业有限公司 A kind of pre- leaching system of aluminium electroloysis waste lining
CN111517349A (en) * 2020-05-13 2020-08-11 河南联宜环保工程有限公司 Method for recovering aluminum fluoride from overhaul residues of aluminum electrolytic cell
CN113292088A (en) * 2021-05-19 2021-08-24 神华准能资源综合开发有限公司 Method for producing low-magnesium and low-calcium alumina from crystalline aluminum chloride

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4113831A (en) * 1975-10-02 1978-09-12 National Fluoride And Chemical Corporation Recovery of sodium fluoride and other chemicals from spent carbon liners

Cited By (4)

* Cited by examiner, † Cited by third party
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
CN108926977A (en) * 2018-09-17 2018-12-04 云南云铝润鑫铝业有限公司 A kind of pre- leaching system of aluminium electroloysis waste lining
CN111517349A (en) * 2020-05-13 2020-08-11 河南联宜环保工程有限公司 Method for recovering aluminum fluoride from overhaul residues of aluminum electrolytic cell
CN113292088A (en) * 2021-05-19 2021-08-24 神华准能资源综合开发有限公司 Method for producing low-magnesium and low-calcium alumina from crystalline aluminum chloride

Also Published As

Publication number Publication date
AU5897598A (en) 1999-06-28
CA2314123C (en) 2006-06-20
AU749436B2 (en) 2002-06-27

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