US Patent 7399268 Method for treatment of arsenic-contaminated soil

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Patent Inventor Names

Hiroshi Murakami0

Toru Ida0

Yutaka Inada0

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Patent abstract

Disclosed herein is a method for treatment of arsenic-contaminated soil, said method being capable of insolubilizing arsenic compounds (in organic form or tri- or pentavalent inorganic form), thereby reducing their leaching level below the environmental standard value for soil. The method consists of heating arsenic-contaminated soil at 200 to 700° C. and mixing the heated soil with a calcium compound and water. The method also consists of mixing arsenic-contaminated soil with a calcium compound, heating the mixed soil at 200 to 700° C., and mixing the heated soil with water.

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https://pdfpiw.uspto.gov/.piw?Docid=073992680

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