Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group va metal or arsenic
Patent
1982-07-16
1985-01-22
Doll, John
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group va metal or arsenic
423 55, 423165, C01B 2700, C01B 2900
Patent
active
044951590
ABSTRACT:
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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Doll John
Langel Wayne A.
Uranium Pechiney Ugine Kuhlmann
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