Treatment of scrap lining material from aluminium reduction...

Details Treatment of scrap lining material from aluminium reduction... Treatment of scrap lining material from aluminium reduction...

C - Chemistry, Metallurgy

04

B

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C04B 11/26 (2006.01) C04B 18/04 (2006.01) C25C 3/08 (2006.01) A62D 3/00 (2006.01)

Patent

CA 1216008

A B S T R A C T A process for treating fluoride-contaminated scrap lining material from electrolytic reduction cells comprises mixing the material with 7-30 parts of sulphuric acid and sufficient water to bring liquid content to 60-80 parts per 100 parts of lining material, mixing in sufficient liner to at least neutralise the sulphuric acid and make the slurry slightly alkaline, the slurry then being allowed to set into a solid mass. The slurry should be of a paste-like consistency, The liner may be wholly calcium hydroxide, but a sub- stantial proportion may be in the form of calcium carbonate. The scrap, before or after the above treatment with lime and sulphuric acid, is preferably heated to 150-500°C in the presence of water vapour to destroy cyanides.

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