Leaching Properties of Slag Produced by Melting Incineration Residue and Fly Ash from Municipal Solid Waste

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  • Tahara Ken-ichi
    Environmental & Chemical Processes Department, Technical Development & Engineering Center, Ishikawajima-Harima Heavy Industries Co., Ltd.
  • Nishino Junya
    Environmental & Chemical Processes Department, Technical Development & Engineering Center, Ishikawajima-Harima Heavy Industries Co., Ltd.
  • Momonoi Kiyosi
    Environmental System Engineering, Nagaoka University of Technology

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Other Title
  • 都市ごみ焼却灰および飛灰溶融スラグの溶出特性
  • トシゴミ ショウキャクバイ オヨビ ヒカイ ヨウユウ スラグ ノ ヨウシュツ トクセイ

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Abstract

The leaching properties of slag produced from melting processes were studied to evaluate the effects of melting and its impact on the environment. 24 kinds of synthetic slag and 7 types of slag from different municipal solid wastes (MSW) and furnaces were examined.<BR>Leaching properties of slag were examined for the amount of acid neccessary to keep the leachate at pH4. The chemical stability of slag given by the amount of acid corresponded well with the chemical components and texture of the slag. This leaching method was useful to evaluate the effect of melting and its impact on the environment.<BR>Slag which had homogeneous amorphous texture and low basicity (CaO/SiO2<0.7) was chemically stable and was only slightly affected by the melting process and the characteristics of the MSW.

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