Title:
DECOMPOSITION OF DIOXINS IN FLY ASH
Document Type and Number:
Japanese Patent JP3513796
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To well decompose dioxins by heating the fly ash, which contains zinc and/or lead and chlorine of which the amt. is chemical equivalent or more with respect to zinc and/or lead and characterized by that the pH of a fly ash aq. soln. is a specific value or less, from an industrial waste incinerator at specific temp. in an inert gas atmosphere.
SOLUTION: The fly ash, which contains zinc and/or lead and chlorine of which the amt. is chemical equivalent or more with respect to zinc and/or lead and characterized by that the pH of an aq. soln. prepared by dissolving 1 g of fly ash in 100 g of water is 7 or less, from an industrial waste incinerator is heated in an inert gas atmosphere at temp. lower than the eutectic point of a base substance and a low m.p. substance but advancing the decomposition of dioxins, that is, at 200-300°C. By this constitution, dioxins can be decomposed without generating the increase in the amt. of dioxins caused by polychlorination. Therefore, dioxins contained in fly ash can be well decomposed.
Inventors:
Yasuda, Kenji
Shinohara, Rikio
Nagaya, Kiichi
Maeda, Nobuhiro
Nakamura, Noriyuki
Shinohara, Rikio
Nagaya, Kiichi
Maeda, Nobuhiro
Nakamura, Noriyuki
Application Number:
JP13020698A
Publication Date:
March 31, 2004
Filing Date:
May 13, 1998
Export Citation:
Assignee:
HITACHI ZOSEN CORP
International Classes:
A62D3/36; A62D3/40; B09B3/00; A62D101/08; A62D101/22; A62D101/28; (IPC1-7): B09B3/00
Attorney, Agent or Firm:
岸本 瑛之助 （外４名）
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