Disposal of fluoride-containing wastes

Details Disposal of fluoride-containing wastes Disposal of fluoride-containing wastes

C - Chemistry, Metallurgy

04

B

261/45

C04B 29/02 (1980.01)

Patent

CA 1088961

Abstract of the Disclosure A method is disclosed for disposing of acid anhydrite waste which has resulted from the treatment of fluorspar with strong sulphuric acid. This waste is mixed with red mud solids from the production of alumina from bauxite to form a slurry having 65-80% solids. The waste is comminuted either before or during the mixing with the red mud solids. The proportions of acid anhydrite waste and red mud solids are selected so that, at the end of the mixing procedure, the slurry has a pH value of at least 3. The resultant red mud/acid anhydrite waste slurry is then pumped to a receiving area and allowed to set into a dense, rock-like mass. The invention is particularly useful in the generation of hydrogen fluoride through the reaction of fluorspar with sulphuric acid.

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