Process for recovering arsenic from acidic aqueous solution
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United States of America Patent
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Jun 19, 2007
Grant Date -
Jan 15, 2004
app pub date -
Dec 14, 2001
filing date -
Dec 14, 2000
priority date (Note) -
Expired
status (Latency Note)
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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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