Process for the separation of arsenic acid from a sulfuric acid-

Details Process for the separation of arsenic acid from a sulfuric acid- Process for the separation of arsenic acid from a sulfuric acid-

1991-05-06

1992-08-11

Silverman, Stanley S.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210726, 210911, 423 87, 423602, 423617, C02F 158, C02F 164

Patent

active

051376407

ABSTRACT:
A process for reducing arsenic levels in a solution containing sulfuric acid, water, and arsenic acid by adding copper or a copper-containing compound to the solution to form dissolved copper arsenate, adding alkali solution to precipitate the copper arsenate and to neutralize arsenic and sulfuric acid. The copper arsenate is separated, and the remaining solution is treated with a ferric compound and an alkali in order to form ferric arsenate to remove residual arsenate. The ferric arsenate is separated and the remaining solution contains less than about 0.79 ppm arsenic. The ferric compound is added so that the ratio of iron to arsenic is about 8:1 to about 10:1 and alkali is added during this step to adjust the pH to from about 5 to about 7.

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