Liu Rui-qing, Wang Jun-wei
College of Environmental Science and Resources, Shanxi University, Taiyuan 030006, China.
Huan Jing Ke Xue. 2013 May;34(5):2051-6.
Occurrence forms of Pb in Yima (YM) coal, their thermal stability and transformation behaviors during coal pyrolysis were investigated. Chemical leaching method was used to characterize the forms of Pb in the raw coal and the chars. It was found that about 33% Pb in YM coal was bound to carbonates, sulfides, sulfates, phosphates and oxides, 29% to aluminosilicates, 27% to disulfide species, and 8% to organic species. It was also found that the organic bound Pb was the most releasable while the aluminosilicates bound Pb was the least releasable. The effect of minerals of different sort on Pb release was also studied. The result showed that carbonates, sulfides, sulfates, phosphates and oxides, aluminosilicates and disulfides in YM coal could restrain Pb release during coal pyrolysis. The transformation of different forms of Pb mainly occurred at above 500 degrees C with other forms of Pb transformed to the aluminosilicates form and volatile phase.
研究了义马（YM）煤中铅的赋存形态、热稳定性及其在煤热解过程中的转化行为。采用化学浸出法对原煤和半焦中铅的形态进行了表征。结果表明，YM煤中约33%的铅与碳酸盐、硫化物、硫酸盐、磷酸盐和氧化物结合，29%与铝硅酸盐结合，27%与二硫化物结合，8%与有机物质结合。还发现有机结合态铅最易释放，而铝硅酸盐结合态铅最难释放。研究了不同种类矿物对铅释放的影响。结果表明，YM煤中的碳酸盐、硫化物、硫酸盐、磷酸盐和氧化物、铝硅酸盐和二硫化物在煤热解过程中可抑制铅的释放。不同形态铅的转化主要发生在500℃以上，其他形态的铅转化为铝硅酸盐形态和挥发相。
