义马煤中几种微量污染元素的赋存形态研究

MODE OF OCCURRENCE OF SEVERAL HARMFUL TRACE ELEMENTS IN YIMA COAL

微量元素在煤转化过程中的变迁行为和其向环境的释放能力主要取决于它们的原始赋存形态。由于微量元素赋存形态的多样性和煤本身的复杂性,煤中微量元素赋存形态的研究尚没有十分成熟的方法。采用密度分离、脱灰处理、逐级化学提取等间接方法研究了义马煤中As、Pb、Cd、Cr等几种微量污染元素的宏观赋存形态。研究表明,义马煤中As、Pb、Cd主要与矿物质伴生,Cr主要赋存在有机质当中。As主要与黄铁矿相伴生;Cd部分与黄铁矿类矿物质伴生,部分与其它难溶矿物质伴生;Pb在硫酸盐、硫化物、硅酸盐等矿物质中均有分布。

The mode of occurrence of trace element in coal is an important factor that influences the evolution behaviour of the element during coal conversion In this paper, the mode of occurrence of As, Pb, Cd, Cr in Yima coal was determined using various methods including density fractionation, demineralisation and sequential chemical extraction The results by different methods were roughly identical Arsenic in Yima coal was found to be primarily associated with pyrite Part of Cadmium associated with pyrite, while others with other mineral matters Lead in Yima coal might be dispersed in many mineral matters such as sulfates, sulfides, silicates and carbonates The mode of occurrence of Chromium was much different from other three, it was primarily associated with organic matters in Yima coal