Patent ID: 8961910
Filing Date: 2015-02-24
Classification: C22B,Y02P

Abstract:
1. A tantalum recovery method for recovering tantalum from a tantalum-containing waste, the method comprising: subjecting a tantalum-containing waste, wherein the tantalum-containing waste is a tantalum sintered compact extracted from a tantalum capacitor, to a magnetic separation treatment which is carried out with a magnetic flux density of 2,000 G to 7,000 G, to thereby separate a non-magnetically attracted tantalum-containing material from a magnetically attracted portion of the tantalum-containing waste, and then subjecting the non-magnetically attracted tantalum-containing material to an acid treatment in an oxidizing atmosphere to thereby remove some impurities therefrom, and thereafter subjecting the tantalum-containing material from which some impurities have been removed to a roasting treatment and then an alkali treatment to thereby remove additional impurities therefrom and produce a recovered tantalum-containing material.