| 摘要 |
PROBLEM TO BE SOLVED: To provide a purifying agent and a purification method that can efficiently remove heavy metals or heavy metal-containing compounds from contaminated water or soil containing silicon compounds.SOLUTION: A purifying agent according to the present invention removes heavy metals or heavy metal-containing compounds from contaminated water or soil containing silicon compounds, and contains iron or its alloy powder, and an alkaline earth metal or its salt. The heavy metals or the heavy metal-containing compounds preferably contain at least selenium as a metal species, and preferably further contain ferrous chloride or ferric chloride. The alkaline earth metal salt is preferably a calcium chloride, magnesium chloride, calcium dihydrogen phosphate, or calcium acetate. The iron or its alloy powder is preferably manufactured by the atomizing method. The iron or its alloy powder preferably contains sulfur. Preferably, the content of sulfur in the iron or its alloy powder is 0.6 mass% or more and 5 mass% or less. |
