| 简介 |
PROBLEM TO BE SOLVED : To provide a wet treatment method for zinc leaching residue by which the amount of copper source substance to be added required for reducing the grade of rare metal such as indium in a solid content mainly including copper and arsenic as copper arsenide is easily determined, and an increase in cost can be suppressed as a result.
SOLUTION : The wet treatment method for zinc leaching residue is provided with : a leaching step where zinc leaching residue removed as a solid content by leaching roasted ore and subjecting the zinc leaching residue to solid-liquid separation in zinc hydrometallurgy is leached with acid, and is subjected to solid-liquid separation; a first neutralizing step where the leach liquor obtained by the leaching step is neutralized, and is subjected to solid-liquid separation; an arsenic removing step where the neutralized liquid obtained by the first neutralizing step is subjected to arsenic removal, and is subjected to solid-liquid separation; a second neutralizing step where the liquid obtained by the arsenic removing step is neutralized, and is subjected to solid-liquid separation; and an iron removing step where the neutralized liquid obtained by the second neutralizing step is subjected to iron removal, and is subjected to solid-liquid separation. In the above method, when the neutralized liquid obtained by the first neutralizing step is subjected to arsenic removal, zinc dust and copper ion source substance such as copper sulfate are added to the neutralized liquid.
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