都市ゴミ焼却炉飛灰および、溶融炉飛灰からの重金属溶出防止に関する基礎研究(2)

概要

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We have studied the preventive method for the elution of heavy metal ions from the fly ash. In this study, we examined the four method; the formation of (1) the sulfides (sodium sulfide or Iron(II) sulfate was used), (2) the complexes (dithiocarbamate), (3) the carbonates (sodium carbonate, aluminum sulfate, poly aluminum chloride), (4) the phosphate (phosphoric acid). The formation of carbonates was effective, judging from a used quantity of chemical reagents, and resulted in a lowering of the elution of Ca^<2+> ions. When the coal ash were set together with cements, the rate of setting was fast in due to containing a large amount of CaSO_4, and the elution of heavy metal ions could be prevented. Also, the use of Iron (II) sulfate could be prevented the elution of CrO_3^<6-> in the fly ash.
近畿大学の論文
2002-03-01