| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method where separability of indium and tin is excellent, and, even from an indium-tin alloy having a high tin content, indium having a remarkably low tin content can be recovered. <P>SOLUTION: In the method for recovering indium, an indium-tin-containing material (such as an In-Sn alloy) containing indium and tin in metal form is dissolved into a hydrochloric acid, sulfuric acid or a mixed acid of hydrochloric acid and sulfuric acid, oxalic acid is added to the solution so as to precipitate tin oxalate, preferably, under the liquefaction of pH 0.5 to 3, then, the tin oxalate precipitates are subjected to solid-liquid separation, indium metal is added to the tin oxalate filtrate, the remaining tin is precipitated so as to remove tin, and base metals such as zinc, aluminum and iron are added to the tin-removed filtrate so as to precipitate indium, thus spongy metal indium is recovered. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
