METHOD FOR PRODUCING WASTE ACID GYPSUM

摘要

PROBLEM TO BE SOLVED: To produce waste acid gypsum with high purity at low cost.

SOLUTION: There is provided a method for producing waste acid gypsum, including the steps of: a waste acid processing step in which sodium hydrosulfide is added to a waste acid containing sulfuric acid formed in copper refining to adjust an oxidation-reduction potential to 20-150 mV(vs. SCE), and sulfurization reaction is performed so that arsenic is removed as sulfide; and a step of producing gypsum by adding alkali to the waste acid in which the sulfide of arsenic is removed, to perform neutralization reaction.

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