METHOD AND APPARATUS FOR COLLECTION OF INDIUM FROM ETCHING WASTE SOLUTION CONTAINING INDIUM AND FERRIC CHLORIDE

摘要

Disclosed are a method and an apparatus for the recovery of indium, which do not need for collecting indium in the form of indium hydroxide, can collect indium at a high concentration, have a good handling property during the collection, can collect indium readily by using a filter or the like, and have a remarkably improved recovery rate. The method comprises the steps of: adding a precipitation-inducing metal to an etching waste solution containing at least indium and ferric chloride to thereby cause the precipitation of indium contained in the etching waste solution onto the surface of the precipitation-inducing metal, wherein the precipitation-inducing metal comprises a metal having higher ionization tendency than indium, and the etching waste solution is so prepared as to contain ferric chloride at a concentration of 20 wt% or less; detaching indium precipitated on the precipitation-inducing metal from the precipitation-inducing metal by a detachment means; and separating the detached solid indium or indium alloy from the liquid fraction and collecting the separated indium or indium alloy.