SEPARATION OF INDIUM FROM SUBSTANCE LEACHED FROM INDIUMMCONTAINING SUBSTANCE WITH SULFURIC ACID

摘要

PURPOSE:To separate selectively and efficiently In from an In-contg. substance such as lead slag by reducing a soln. leached from the substance with sulfuric acid and neutralizing the reduced soln. to a specified pH range with alkali. CONSTITUTION:In separation of In from an In-contg. substance such as Cd refining by-product lead slag contg. coexistent As, Zn, Pb, Cd, Te, Tl, etc., the substance is leached with sulfuric acid, and the leached soln. is reduced by blowing SO2 into the soln., adding Cu dust and agitating, or adding hydrogen sulfide or acidic sodium sulfide. The reduced soln. is then adjusted to pH3-4 by treatment with alkali hydroxide to precipitate In in the soln. as hydroxide of high purity.