| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that the conventional iron sulfide particle-containing slurry has corrosiveness and bad smell under the influence of coexisting salts, and further that it has trouble with respect to safety and operability in using as a heavy metal-immobilizing treatment agent for waste containing a heavy metal because of causing precipitation of iron sulfide under the influence of coexisting salts. SOLUTION: The iron sulfide particle-containing solution, which is obtained by mixing an aqueous solution of a divalent iron salt and an aqueous solution containing sulfur ion so as to keep the pH within a constant pH range to obtain slurry containing iron sulfide and by removing the coexisting salts through subjecting the slurry to filtration and washing and by again dispersing the iron sulfide cake with water, has no influence of coexisting salts, has no trouble with respect to corrosiveness and bad smell, and has high operability because of not causing precipitation at a high concentration of iron sulfide. COPYRIGHT: (C)2006,JPO&NCIPI
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