A Preliminary Study on Dependence of Mercury Distribution on the Degree of Coalification in Ningwu Coalfield, Shanxi, China

Mercury (Hg) is a toxic trace element emitted from coal conversion and utilization. Samples with different ranks gangue Ningwu Coalfield are selected investigated in this study. For understanding dependence of mercury distribution characteristics on coalification degree, Pearson regression analysis coupled Spearman rank correlation employed to explore the relationship between sulfur, ash coal, sequential chemical extraction method adopted recognize Hg speciation samples gangue. The measured results show that positively related total sulfur content affinity forms varies degree. Organic has biggest impact peat, which becomes weak increasing degree lignite bituminous coal. Sulfate only peat or as little However, linear coefficients pyritic relatively high 0.479 for lignite, 0.709 sub-bituminous 0.887 also whose 0.504, 0.774 0.827 respectively, Furthermore, directly depended own proportion F2 + F3 F4 increased 41.5% 87.4% but average F5 decreased 56.8% 12.4% above findings imply both enrich largely due migration organic state inorganic increase Coalfield.