FR2317224A1 - PROCESS FOR REMOVING CYANIDE FROM USED CATHODIC PADDINGS OF ALUMINUM ELECTROLYSIS CELLS - Google Patents

PROCESS FOR REMOVING CYANIDE FROM USED CATHODIC PADDINGS OF ALUMINUM ELECTROLYSIS CELLS

Info

Publication number
FR2317224A1
FR2317224A1 FR7619338A FR7619338A FR2317224A1 FR 2317224 A1 FR2317224 A1 FR 2317224A1 FR 7619338 A FR7619338 A FR 7619338A FR 7619338 A FR7619338 A FR 7619338A FR 2317224 A1 FR2317224 A1 FR 2317224A1
Authority
FR
France
Prior art keywords
cyanide
paddings
electrolysis cells
aluminum electrolysis
removing cyanide
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
FR7619338A
Other languages
French (fr)
Other versions
FR2317224B1 (en
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.)
Vereinigte Metallwerke Ranshoffen Berndorf AG
Original Assignee
Vereinigte Metallwerke Ranshoffen Berndorf AG
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 Vereinigte Metallwerke Ranshoffen Berndorf AG filed Critical Vereinigte Metallwerke Ranshoffen Berndorf AG
Publication of FR2317224A1 publication Critical patent/FR2317224A1/en
Application granted granted Critical
Publication of FR2317224B1 publication Critical patent/FR2317224B1/fr
Granted legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
    • C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
    • C25C3/08—Cell construction, e.g. bottoms, walls, cathodes
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Coloring (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The process is used to destroy or detoxify the cyanide present in old furnace bottoms. This process overcomes the problems which result from the presence of cyanides in the used bottom carbon when this is leached or tipped. To solve the problem, the bottom carbon containing the cyanide, after appropriate size reduction is subjected to a thermal treatment in which both free and complex cyanide is destroyed. The carbon is preferably heated to a temperature in the range of 300-500 DEG C. Under these conditions, hydrogen fluoride or other fluorine compounds are not yet released.
FR7619338A 1975-06-27 1976-06-25 PROCESS FOR REMOVING CYANIDE FROM USED CATHODIC PADDINGS OF ALUMINUM ELECTROLYSIS CELLS Granted FR2317224A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT494675A AT341238B (en) 1975-06-27 1975-06-27 METHOD OF THERMAL CYANIDE DEGRADATION OF USED CATHODE LINES OF ALUMINUM ELECTROLYSIS CELLS

Publications (2)

Publication Number Publication Date
FR2317224A1 true FR2317224A1 (en) 1977-02-04
FR2317224B1 FR2317224B1 (en) 1981-06-19

Family

ID=3570204

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7619338A Granted FR2317224A1 (en) 1975-06-27 1976-06-25 PROCESS FOR REMOVING CYANIDE FROM USED CATHODIC PADDINGS OF ALUMINUM ELECTROLYSIS CELLS

Country Status (6)

Country Link
AT (1) AT341238B (en)
CH (1) CH619272A5 (en)
DE (1) DE2628192A1 (en)
FR (1) FR2317224A1 (en)
IT (1) IT1066251B (en)
NO (1) NO144956C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111747395A (en) * 2020-07-07 2020-10-09 昆明理工大学 Method for deep defluorination by microwave roasting-hydrothermal alkaline leaching of aluminum electrolysis waste cathode

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2228723A1 (en) * 1973-05-10 1974-12-06 Jenapharm Veb
JPS5079441A (en) * 1973-11-19 1975-06-27

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2228723A1 (en) * 1973-05-10 1974-12-06 Jenapharm Veb
JPS5079441A (en) * 1973-11-19 1975-06-27

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111747395A (en) * 2020-07-07 2020-10-09 昆明理工大学 Method for deep defluorination by microwave roasting-hydrothermal alkaline leaching of aluminum electrolysis waste cathode
CN111747395B (en) * 2020-07-07 2021-03-19 昆明理工大学 Method for deep defluorination by microwave roasting-hydrothermal alkaline leaching of aluminum electrolysis waste cathode

Also Published As

Publication number Publication date
IT1066251B (en) 1985-03-04
AT341238B (en) 1978-01-25
FR2317224B1 (en) 1981-06-19
ATA494675A (en) 1977-05-15
NO762191L (en) 1976-12-28
CH619272A5 (en) 1980-09-15
DE2628192A1 (en) 1977-01-20
NO144956C (en) 1981-12-16
NO144956B (en) 1981-09-07

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Legal Events

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ST Notification of lapse