Method of treating an arsenic-containing solution

Details Method of treating an arsenic-containing solution Method of treating an arsenic-containing solution

1990-01-31

1991-06-18

Silverman, Stanley

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210727, 210728, 210754, 210763, 210764, 210911, 210916, C02F 176, C02F 158

Patent

active

050247697

ABSTRACT:
A method is provided for oxidizing arsenic in an arsenic-containing solution. The method comprises contacting the solution containing arsenic in a +3 oxidation state with an amount of a specific type of oxidizing agent, i.e., an agent containing at least one ##STR1## wherein X is a halogen to effect substantially complete oxidation of the arsenic to the +5 oxidation state. The amount of oxidizing agent used is substantially less than that which would theoretically be required. In accordance with a particularly preferred embodiment, the oxidized arsenic is reacted with a metal to form a substantially water-insoluble precipitate, preferably an iron or calcium arsenate.

REFERENCES:
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patent: 3342674 (1967-09-01), Kowalski et al.
patent: 4201667 (1980-05-01), Liao
patent: 4297224 (1981-10-01), Marchiarolo et al.
patent: 4465598 (1984-08-01), Darlington et al.
patent: 4637865 (1987-01-01), Sergent et al.
patent: 4710305 (1987-12-01), Allison et al.
patent: 4763479 (1988-08-01), Hoyer et al.

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