Leaching Characteristics of Trace Elements in Desulfurization Gypsum from a Coal-fired Power Plant
The contents and leaching characteristics of Cr,Cd,As,Pb and Se in FGD gypsum from a 200MW coalfired power plant were investigated in this study.Experimental results revealed that: the leaching characteristics of As and Se were similar,both leaching rates were not obviously affected by pH but increased with increase of the liquid-solid ratio.Pb and Cr had similar leaching characteristics,their leaching rates were closely related with the pH of leaching solution and increased with the lowering of pH and both increased with the increasing of solid-liquid ratio.Along with the increase of the liquid-solid ratio,the leaching gradually achieved balance,and the balanced liquidsolid ratio was bigger when pH of leaching solution was lower.Cd content of leaching solution was below detect limit,and thus failed to get its leaching characteristics.The order of trace element content in leaching solution is Pb < Cr < As < Se,and the order of leaching rates is Cr < As < Pb < Se.BCR extraction procedure revealed that trace elements in FGD gypsum were mainly existed as available fraction and migration ability was stronger than that of trace elements in fly ash from coal-fired power plants.
FGD gypsum trace elements leaching characteristics
Y.K.Liu Y.Q.Zhuo Z.W.Zhu C.H.Chen
Institute of Theraml Engineering,Tsinghua University,Beijing 100084,China
国际会议
The 7th International Symposium on Coal Combustion(第七届国际煤燃烧学术会议)
哈尔滨
英文
261-266
2011-07-19（万方平台首次上网日期，不代表论文的发表时间）