Patent ID: 8110162
Filing Date: 2012-02-07
Classification: C01G,C01P,C02F,C22B,Y02P

Abstract:
1. An arsenic removal method, comprising: a leaching step of leaching a non-ferrous smelting intermediate comprising a copper arsenic compound in the form of an intermetallic compound in the presence of monatomic sulfur, and obtaining a leaching solution comprising arsenic; a solution adjusting step of oxidizing trivalent arsenic in the leaching solution to pentavalent arsenic, and obtaining an adjusted solution; and a crystallizing step of converting the arsenic in the adjusted solution to scorodite, wherein said leaching step comprises forming a slurry from a mixture of the non-ferrous smelting intermediate and monatomic sulfur, and performing to the slurry one or more actions selected from the group consisting of blowing in of air, blowing in of oxygen, blowing in of a gas mixture of oxygen and air, and addition of a sulfidizing agent, at a temperature of 50° C. or higher until the redox potential in the slurry is 250 mV or higher with Ag/AgCl reference electrode.