Toxic elements reducing material and toxic elements reduction method

摘要

PROBLEM TO BE SOLVED: To simply, quickly and inexpensively remove arsenic from a treatment object.SOLUTION: The method for decreasing harmful elements includes a treatment process to reduce the arsenic content in a treatment object or reduce the amount of arsenic eluted from the treatment object by bringing the treatment object into contact with a material for decreasing harmful elements that contains ≥70 mass% of steelmaking slag having an iron content of ≥30 mass%, a calcium content of ≥10 mass%, and a silicon content of ≤10 mass%. Before performing the treatment process, it is desirable to oxidize the trivalent arsenic contained in the treatment object to pentavalent arsenic. Consequently, arsenic can be simply, quickly and inexpensively removed from the treatment object. Further, hexavalent chrome, beryllium, nickel, copper, zinc, cadmium, mercury and lead can be simply, quickly and inexpensively removed simultaneously with arsenic by the exact same treatment.