Abstract Chemical characterization and mobility of metal species in fly ash–water system
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Chemical characterization and mobility of metal species in fly ash–water system

机译：粉煤灰-水系统中金属物种的化学表征和迁移率

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Abstract The present investigation was conducted to study the leaching characteristics, speciation and fractionation of trace and major elements from fly ash. Five liquid-to-solid ratios (L/S) were selected, ranging from 0.5 to 1. The releasing of trace and major elements from fly ash increased as L/S ratios increased or over time (at pH=2.88). γ-Al(OH)3, Cd3(PO4)2, azurite, jarosite, MnCO3, Pb(OH)2, quartz (SiO2) and ZnCO3 are the solid phases that control Al, Cd, Cu, Fe, Mn, Pb, Si and Zn activities in fly ash leachates. The sequential chemical extraction tests showed that Al, Cd, Cu, Fe, Mn, Pb, Si and Zn were mainly present in the last three fractions, which were Fe–Mn oxides, organics and residual fractions and their leachability could be well-controlled in common natural environment. According to risk assessment code (RAC); Cd, Cu, Mn and Pb show a medium risk, while Zn and Fe shows low risk level, but Al and Si are considered safe to our environment.
机译： 摘要 进行了本研究，以研究粉煤灰中痕量和主要元素的浸出特性，形态和分馏。选择了五种液/固比（L / S），范围从0.5到1。随着L / S比的增加或随着时间的推移，粉煤灰中微量元素和主要元素的释放增加（在pH = 2.88）。 γ-Al（OH） 3 ，Cd 3 （PO 4 ） 2 ，石青石，黄钾铁矾，MnCO 3 ，Pb（OH） 2 ，石英（SiO 2 ）和ZnCO 3 是控制粉煤灰渗滤液中Al，Cd，Cu，Fe，Mn，Pb，Si和Zn活性的固相。连续化学萃取试验表明，Al，Cd，Cu，Fe，Mn，Pb，Si和Zn主要存在于后三个馏分中，它们是Fe-Mn氧化物，有机物和残留馏分，并且其浸出性可以得到很好的控制。在共同的自然环境中。根据风险评估代码（RAC）; Cd，Cu，Mn和Pb处于中等风险，而Zn和Fe则处于低风险水平，但是Al和Si被认为对我们的环境是安全的。

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