| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that the potential of a conventional heavy metal-treating agent is not sufficient in treating a heavy metal-contaminated material contaminated with a harmful anionic kind and cationic kind, and handling is difficult and generating harmful gas, or the like. SOLUTION: The heavy metal-treating agent composed of a carbodithioic acid salt of piperazine and a dialkali metal sulfide, which is free from generation of the harmful gas and capable of treating the heavy metal-contaminated material contaminated with the harmful anionic kind and cationic kind, with one agent. The preferable carbodithioic acid salt of piperazine is piperazine-N,N'-biscarbodithioic acid potassium and/or piperazine-N,N'-biscarbodithioic acid sodium, and the preferable dialkali metal sulfide is disodium sulfide and/or dipotassium sulfide. The carbodithioic acid salt of an amine having at least a carbodithioic acid group bonding to a primary amino group is preferable. COPYRIGHT: (C)2011,JPO&INPIT
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