The Study of Shifting of Valuable Metals to Riddling Ash in Municipal Solid Waste Incineration Process

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  • 一般廃棄物焼却プロセスにおける有価金属の落じん灰への移行挙動の解明
  • イッパン ハイキブツ ショウキャク プロセス ニ オケル ユウカ キンゾク ノ ラクジンハイ エノ イコウ キョドウ ノ カイメイ

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Abstract

The characteristics of riddling ash from stoker-type municipal solid waste incinerator were investigated. The contents of Cu, Zn and Pb in riddling ash were greater than that in other MSWI residues, and the contents of precious metals, such as Au and Ag, were nearly equal to their ores. There was a correlation between grate type and the contents of Cu, Zn and Pb in riddling ash. The contents of Cu, Zn and Pb in riddling ash for the reciprocating flat grate type were greater than that of the parallel swing grate type. It was confirmed that 20-60% of Cu, Zn and Pb in MSW were discharged as riddling ash. Analysis by XAFS spectroscopy at beam line BL01B1 in SPring-8 led us to consider that the predominant chemical states of Cu, Zn, Pb and Ag in riddling ash under drying and combustion zone are metallic states. It is considered possible for riddling ash to be come a source of non-iron materials by separating it from bottom ash because of the large amounts of Cu, Zn, Pb and precious metals contained in it.

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