Method of treating an arsenic-containing solution
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United States of America Patent
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Jun 18, 1991
Issued Date -
N/A
app pub date -
Jan 31, 1990
filing date -
Jul 29, 1988
priority date (Note) -
Expired
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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.
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