The present invention relates to novel iron sulfides having excellent durability, processes for producing the same, iron sulfide mixture, {HEAD ~ a heavy metal treating agent} containing {TAIL ~ either} of these novel iron sulfides as an effective component, and a method by which wastes containing various heavy metals are made harmless with the heavy metal treating agent 
containing
The present invention relates to novel iron sulfides having excellent durability , processes for producing the same , iron sulfide mixture , { HEAD ~ a heavy metal treating agent } containing { TAIL ~ either } of these novel iron sulfides as an effective component , and a method by which wastes containing various heavy metals are made harmless with the heavy metal treating agent
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