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Liquid us Curves in the Quaternary System NaF—AIF 3 —CaF 2 —Al 2 O 3
Author(s) -
FOSTER PERRY A.
Publication year - 1960
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1960.tb13691.x
Subject(s) - cryolite , fluoride , aluminium , electrolyte , stoichiometry , fluorine , calcium , inorganic chemistry , chemistry , materials science , metallurgy , electrode
THE electrolyte that is employed in the commercial production of aluminum generally consists of a fused mixture of cryolite, aluminum fluoride, calcium fluoride, and alumina. The aluminum fluoride is added to alter the cryolite ratio (3NaF/AlF 3 )* from the stoichiometric value of 1.5 to some lower value. Calcium fluoride is added to permit lower operating temperatures. Typically, the calcium fluoride content of the commercial electrolyte is usually between 7 and 9%. Alumina, of course, is continually being consumed in the production of aluminum. Periodic additions of alumina to the cell maintain the level between 2 and 50%.