abstract |
(57) Abstract: To provide a method for efficiently producing pentavalent arsenic from an aqueous solution containing arsenic, and further to provide a method for efficiently producing calcium arsenate as an arsenate. is there. A method for recovering arsenic includes a step of adding copper and copper oxide or copper or copper oxide to an aqueous solution containing arsenic to oxidize arsenic ions. Furthermore, a step of leaching an arsenic-containing sulfide using the recovery method with an alkali, a step of oxidizing with an oxidizing agent in the presence of copper and copper oxide or copper or copper oxide, and a step of treating with slaked lime A method for producing calcium arsenate comprising: |