Process for recovering arsenic from acidic aqueous solution

Details Process for recovering arsenic from acidic aqueous solution Process for recovering arsenic from acidic aqueous solution

2007-06-19

2007-06-19

Bos, Steven (Department: 1754)

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group va metal or arsenic

C423S088000, C423S531000, C423S617000, C210S912000, C210S710000, C210S737000

Reexamination Certificate

active

10381566

ABSTRACT:
A process for the recovery of arsenic trioxide from acid solutions, particularly the aqueous acid effluent produced by a gas-washing process in the pyrometallurgy of copper sulfide ores is provided. Generally, the process comprises concentrating the acid solution in one or more evaporators in series; crystallizing arsenic contained in the concentrated solution as arsenic trioxide crystals; filtering the crystallized solution to obtain a solid phase comprising impure arsenic trioxide crystals; and purifying the solid phase to obtain a purified crystal product comprising arsenic trioxide. The process produces a commercially salable arsenic trioxide product without producing any solid or liquid residues subject to special handling or treatment regulations.

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