| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for treating metal residue by which hexavalent chrome in the metal residue can be suitably removed and thereby treatment cost is suppressed and value of treated metal is raised. <P>SOLUTION: A reaction tank 1 is provided with a first charging line 2 for charging the metal residue containing hexavalent chrome, a second charging line 3 for charging water, an organic substance and an acid and further is provided with a stirring means 4 for stirring the metal residue, water, the organic substance and the acid in the reaction tank. Hexavalent chrome is reduced to trivalent chrome by reaction: Cr<SB>2</SB>O<SB>7</SB><SP>2-</SP>+14H<SP>+</SP>+6e<SP>-</SP>→2Cr<SP>3+</SP>+7H<SB>2</SB>O. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
