Influence of particle size preparation of MSW incineration residues on heavy metal leaching behavior in leaching tests.

Environmental sciences : an international journal of environmental physiology and toxicology Pub Date : 2006-01-01

Satoshi Mizutani, Nobuhisa Watanabe, Shin-Ichi Sakai, Hiroshi Takatsuki

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Abstract

This study examines the influence of particle size preparation on leaching tests of heavy metal leaching behavior of municipal solid waste (MSW) incineration fly ash and MSW melting slag. The MSW incineration fly ash and melting slag were divided into 2-3 fractions by sieving. The metal contents of the respective fractions were determined and the representativeness of the samples was verified. Differences in the metal contents of the fractions with different particle sizes were significant for MSW incineration fly ash. Therefore, particle size preparation by sieving should not be done prior to these leaching tests. In contrast, differences in metal contents of different particle sizes of melting slag were not significant. Therefore, sample fractions with identical metal contents are obtainable by sieving. The metal leaching quantities by the Japanese Leaching Test Method No. 19 (JLT-19) depend on the chemical stability and particle size preparation of slag. The modified basicity, [(CaO+MgO+Na(2)O+K(2)O) / (SiO(2)+Al(2)O(3))], is useful as an index of the chemical stability of slag.

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垃圾焚烧渣粒径制备对重金属浸出行为的影响

研究了不同粒径制备对城市生活垃圾焚烧飞灰和城市生活垃圾熔渣重金属浸出行为的影响。将城市生活垃圾焚烧飞灰和熔融渣通过筛分分成2 ~ 3个馏分。测定了各组分的金属含量，并验证了样品的代表性。城市生活垃圾焚烧飞灰中不同粒径组分的金属含量差异显著。因此，在这些浸出试验之前不应进行筛分粒度制备。不同粒径的熔渣金属含量差异不显著。因此，通过筛分可获得具有相同金属含量的样品馏分。日本浸出试验方法第19号(JLT-19)规定的金属浸出量取决于矿渣的化学稳定性和粒度制备。改性碱度[(CaO+MgO+Na(2)O+K(2)O) / (SiO(2)+Al(2)O(3))]可作为评价炉渣化学稳定性的指标。

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Environmental sciences : an international journal of environmental physiology and toxicology

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