Process for extracting arsenic from oxidic materials

Details Process for extracting arsenic from oxidic materials Process for extracting arsenic from oxidic materials

C - Chemistry, Metallurgy

22

B

53/175

C22B 30/00 (2006.01)

Patent

CA 1107514

ABSTRACT OF THE DISCLOSURE A process is disclosed for the selective extraction of arsenic from oxidic materials containing compounds such as arsenic trioxide, arsenic pentoxide, antimony trioxide, antimony pentoxide, antimony tetroxide and mixtures thereof in which arsenic is effectively separated from antimony. Said oxidic materials are subjected to a leach with a lixiviant containing arsenic acid or hydrogen peroxide at a temperature in the range of 40°C to the boiling point of the reaction mixture, preferably in the range of 80 to 100°C, for 5 to 90 minutes. The leach solution containing arsenic oxides is separated from leach residue. The leach solution is either cooled to a temperature in the range of 5 to 25°C to crystallize and subsequently recover arsenic trioxide or the solution is oxidized and evaporated and arsenic pentoxide is recovered. Arsenic acid lixiviant contains 5 to 500 g/l arsenic as arsenic pentoxide, preferably 25 to 200 g/l, and hydrogen peroxide lixiviant preferably contains a 10 to 60% hydrogen peroxide concentration.

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