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Extraction of arsenic in solution in liquors containing carbonate, sulphate, optionally hydroxide, alkalis, as well as at least one of the metals vanadium, uranium and molybdenum.
Extraction of arsenic in solution in liquors containing carbonate, sulphate, optionally hydroxide, alkalis, as well as at least one of the metals vanadium, uranium and molybdenum.
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机译：在含有碳酸盐，硫酸盐，任选的氢氧化物，碱以及金属钒，铀和钼中至少一种的溶液中提取溶液中的砷。
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摘要
A process for extracting arsenic from aqueous solution to be purified, in accordance with claim 1 of U.S. Pat. No. 2,404,601, which also contains alkali metal carbonate, sulphate, hydroxide or hydrogen carbonate, and which may also contain at least one of the metals vanadium, uranium and molybdenum, comprising caustification of said solutions by means of lime to convert the carbonates into alkali metal hydroxides, followed by separation of an alkali metal hydroxide-enriched liquor and a first precipitate essentially containing calcium carbonate which is subjected to a washing operation, concentration by evaporation of the mixture of the washing liquor of the first precipitate to produce a second precipitate which essentially comprises alkali metal sulphate, which is characterized in that, before the aqueous solution is caustified, the aqueous solution is treated by a magnesium compound in an amount at least equal to the stoichiometric amount required to cause precipitation of magnesium arsenate.
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