GB970798A - Improvements relating to the production of aluminium - Google Patents

Improvements relating to the production of aluminium

Info

Publication number
GB970798A
GB970798A GB38570/62A GB3857062A GB970798A GB 970798 A GB970798 A GB 970798A GB 38570/62 A GB38570/62 A GB 38570/62A GB 3857062 A GB3857062 A GB 3857062A GB 970798 A GB970798 A GB 970798A
Authority
GB
United Kingdom
Prior art keywords
concentration
electrolyte
hours
alf3
maintained
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.)
Expired
Application number
GB38570/62A
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.)
Alcan Holdings Switzerland AG
Original Assignee
Alusuisse Holdings AG
Schweizerische Aluminium 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 Alusuisse Holdings AG, Schweizerische Aluminium AG filed Critical Alusuisse Holdings AG
Publication of GB970798A publication Critical patent/GB970798A/en
Expired 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
    • C25C3/20—Automatic control or regulation of cells

Abstract

Aluminium is produced in an electrolytic furnace from a fluoride electrolyte comprising cryolite (3NaF.AlF3), AlF3 and dissolved Al2O3 maintained at a temperature between 940 and 960 DEG C., the concentration of Al2O3 in the electrolyt being maintained between 5 and 7% by weight, and the concentration of AlF3 in the electrolyte being maintained between 5 and 7% by weight above that amount which is stoichiometrically demanded for combination with NaF as cryolite. Prebaked or self-baking carbon anodes are used and current efficiency is calculated from the concentration of CO2 and CO in the anode gases. A current efficiency of 90-96% can be achieved. The electrolyte crust may be automatically broken at intervals of 1/4 -3 hours, e.g. every 1-2 hours, and alumina and aluminium fluoride supplied. At least once every 48 hours and at most twice every 24 hours an anode effect may be made to occur by allowing the concentration of alumina in the electrolyte to drop to 3-2.5% while maintaining the temperature. During the anode effect, gaseous impurities, slag and oxides are driven out of the electrolyte and a uniform Al2O3 concentration is obtained.
GB38570/62A 1961-10-17 1962-10-11 Improvements relating to the production of aluminium Expired GB970798A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1203061A CH412351A (en) 1961-10-17 1961-10-17 Method for operating an aluminum electrolysis furnace

Publications (1)

Publication Number Publication Date
GB970798A true GB970798A (en) 1964-09-23

Family

ID=4379191

Family Applications (1)

Application Number Title Priority Date Filing Date
GB38570/62A Expired GB970798A (en) 1961-10-17 1962-10-11 Improvements relating to the production of aluminium

Country Status (5)

Country Link
US (1) US3294656A (en)
CH (1) CH412351A (en)
DE (1) DE1181431B (en)
FR (1) FR1335410A (en)
GB (1) GB970798A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104911634A (en) * 2015-05-07 2015-09-16 北方工业大学 Method for evaluating current distribution of anode of electrolytic cell according to anode conductivity
CN103710730B (en) * 2013-12-11 2016-05-11 中国铝业股份有限公司 Alumina concentration determinator and method in a kind of aluminium cell
CN113026057A (en) * 2021-03-05 2021-06-25 浙江捷创智能技术有限公司 Online soft measurement method for current efficiency of aluminum electrolysis cell

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3380897A (en) * 1964-11-16 1968-04-30 Reynolds Metals Co Method of determining ore concentration
NL130687C (en) * 1965-05-28
US3625842A (en) * 1968-05-24 1971-12-07 Kaiser Aluminium Chem Corp Alumina feed control
US3485727A (en) * 1968-07-17 1969-12-23 Reynolds Metals Co Voltage control in aluminum electrolysis cells during flex-raise period
US3622475A (en) * 1968-08-21 1971-11-23 Reynolds Metals Co Reduction cell control system
US3852173A (en) * 1973-06-28 1974-12-03 Aluminum Co Of America Alumina reduction process
US3839167A (en) * 1973-06-28 1974-10-01 Aluminum Co Of America Novel alumina feed for aluminum cell
JPS52106309A (en) * 1976-03-04 1977-09-06 Mitsubishi Chem Ind Ltd Control of alumina supplying for aluminum electrolytic cell
JPS548109A (en) * 1977-06-22 1979-01-22 Mitsubishi Keikinzoku Kogyo Controlling method of feeding alumina into aluminum electrolytic bath
CN104451776B (en) * 2013-09-13 2017-02-01 湖南创元铝业有限公司 Anode ledge elimination agent and use method thereof
CN105568319A (en) * 2016-01-19 2016-05-11 中国铝业股份有限公司 Method for testing instantaneous current efficiency of aluminium cell
CN114965879B (en) * 2022-05-12 2023-10-24 中国铝业股份有限公司 Method for determining carbon dioxide emission in aluminum electrolysis process and related equipment

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE534969A (en) * 1954-01-19
US2933440A (en) * 1956-10-09 1960-04-19 Kaiser Aluminium Chem Corp Method and apparatus for detection of anode effect
US3034972A (en) * 1958-03-28 1962-05-15 Kaiser Aluminium Chem Corp Electrolytic production of aluminum

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103710730B (en) * 2013-12-11 2016-05-11 中国铝业股份有限公司 Alumina concentration determinator and method in a kind of aluminium cell
CN104911634A (en) * 2015-05-07 2015-09-16 北方工业大学 Method for evaluating current distribution of anode of electrolytic cell according to anode conductivity
CN113026057A (en) * 2021-03-05 2021-06-25 浙江捷创智能技术有限公司 Online soft measurement method for current efficiency of aluminum electrolysis cell

Also Published As

Publication number Publication date
FR1335410A (en) 1963-08-16
CH412351A (en) 1966-04-30
DE1181431B (en) 1964-11-12
US3294656A (en) 1966-12-27

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