| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method capable of extracting In from In-contg. scrap contg. In in the state of In oxide under mild acid treating conditions. SOLUTION: In-contg. scrap is subjected to mechanochemical treatment, e.g. of being subjected to dry pulverizing for a prescribed time by a planetary mill in the coexistence of ceramic powder of alumina (Al2O3), or the like, the crystal structure of In oxide (In2O3) is made amorphous, and after that, it is leached into a sulfuric acid of about 1 to 5N, by which In can be leached at >=80% high leaching ratio from the In-contg. scrap even at room temp. In this way, compared to the case of the conventional methods acid or alkali of high temp. and high concn., the intrusion of impurities from a melting tank is made small, there is no need of particularly increasing the acid resistance of the material of the melting tank, and the operating environment is moreover improved. The separability between In and Al in the leaching is also better.</p> |
