{TAIL ~ The present invention} relates to novel iron sulfides having excellent durability, {HEAD ~ processes} for producing the same, iron sulfide mixture, a heavy metal treating agent containing 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 
{ TAIL ~ The present invention } relates to novel iron sulfides having excellent durability , { HEAD ~ processes } for producing the same , iron sulfide mixture , a heavy metal treating agent containing 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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