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AssigneeKabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
InventorsTakao Harada, Haruyasu Michishita, Hidetoshi Tanaka, Hiroshi Tamazawa, Hiroshi Sugitatsu
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The present invention provides a method of purifying polluted soil and/or burned ash containing heavy metals and/or organic compounds with a higher throughput than a conventional method. In this method, polluted soil and/or burned ash is dried by, for example, a rotary dryer so that the moisture content is 5% by mass or less, preferably 3% by mass or less, and then large lumps having a particle diameter of 10 mm or more are removed by a vibrating screen. Only an undersize portion is formed into a briquette having a volume of about 6 cm3 by a press molding machine. The briquette is charged in a rotary hearth furnace together with the large lumps, and heated in the furnace to remove or detoxify the heavy metals and organic compounds by evaporation with high efficiency.
A method of treating a heavy metal and/or organic compound comprising a heating step of heating a material containing a heavy metal and/or organic compound, in a radiant rapid heating furnace to purify the material.
A method of treating a heavy metal and/or organic compound comprising an agglomeration step of agglomerating at least a portion of a material containing a heavy metal and/or organic compound, to form agglomerates, and a heating step of heating the agglomerates and the unagglomerated residue of the material in a radiant rapid heating furnace to purify the material.
A method of treating a heavy metal and/or organic compound comprising a mixing step of mixing a carbonaceous reducing agent and a metal oxide-containing material with a material containing a heavy metal and/or organic compound, and a heating step of heating the resultant mixture in a heating furnace to purify the material.
Dependencies are inferred from the claim text.