Process of preparing low-iron ammonium alum

Details Process of preparing low-iron ammonium alum Process of preparing low-iron ammonium alum

C - Chemistry, Metallurgy

25

C

C25C 1/00 (2006.01) C01C 1/24 (2006.01)

Patent

CA 2129926

A process is disclosed for preparing low-iron ammonium alum from an aqueous ammonium alum solution which contains Fe3+ ions. This aqueous ammonium alum solution which has a pH not in excess of 5, is passed through at least one electrolytic cell to reduce at least one half of the Fe3+ ions in the solution to Fe2+ ions. The solution is cooled and ammonium alum is crystallized whereas the Fe2+ ions remain in the liquid phase.

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