| 摘要 |
<P>PROBLEM TO BE SOLVED: To simply, quickly and inexpensively remove arsenic from an object to be treated. <P>SOLUTION: The method for reducing harmful elements includes a treatment process of reducing the arsenic content in the object to be treated by contacting the object with the harmful element-reducing agent containing a steelmaking slag of ≥85 mass%. Prior to carrying-out of the process, it is desirable to oxidize the trivalent arsenic included in the object to a pentavalent one, and the steelmaking slag preferably contains, by mass, ≥20% iron, ≥20% calcium and ≤10% silicon. Thereby, arsenic can be simply, quickly and inexpensively removed from the object. Further, hexavalent chrome, beryllium, nickel, copper, zinc, cadmium, mercury and lead as well as arsenic can be simply, quickly and inexpensively removed by exactly the same treatment as above. <P>COPYRIGHT: (C)2013,JPO&INPIT |
