1. A method for treatment of arsenic-contaminated soil which comprises heating arsenic-contaminated soil at 200 to 700° C.
in the presence of air or oxygen thereby converting trivalent inorganic arsenic compounds and organoarsenic compounds in the
arsenic-contaminated soil into pentavalent inorganic arsenic compounds which are readily soluble in water; and mixing the
heated soil with a calcium compound and water into a mixture thereby converting said pentavalent inorganic arsenic compounds
into calcium arsenate compounds,
wherein 100 parts by weight of the heated soil is mixed with 3 to 20 parts by weight of the calcium compound and 10 to 70
parts by weight of the water.
|