| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a recovery method capable of recovering arsenic from nonferrous smelting smoke ash as a pentavalent arsenic solution without using a sulfating agent, and restraining copper from being mixed into the pentavalent arsenic solution. <P>SOLUTION: The method for recovering arsenic from nonferrous smelting smoke ash includes: a step for slurrying the nonferrous smelting smoke ash; a step for performing primary leaching step with the pH value of the slurry being 0.5 or less; a neutralization step for causing the slurry after the primary leaching step to be subjected to solid-liquid separation, and adding a neutralizer to the obtained primary leaching solution to obtain a solution after neutralization; an oxidation step for obtaining an oxidized precipitate by causing the solution after neutralization to be subjected to solid-liquid separation after an oxidizing agent is provided to the solution after neutralization; and a step for slurrying the oxidized precipitate, performing secondary leaching, and obtaining a pentavalent arsenic solution for producing crystalline iron arsenate as the secondary leaching solution. <P>COPYRIGHT: (C)2013,JPO&INPIT |
