贵州省六枝、遵义矿区煤中汞和硫的赋存相关特性研究

A study on the occurrence and correlation between mercury and sulfur in coals form Liuzhi and Zunyi coal mines in Guizhou province

选取贵州省六枝(LZ)、遵义(ZY)两不同矿区的高汞高硫煤为研究对象,对煤样进行煤浮沉、逐级化学萃取等实验,利用低温灰化(LTA)和X射线衍射(XRD)等手段,分析研究煤中汞和硫存在形式和两种元素之间的相关性。结果表明,在LZ煤中,硫主要以黄铁矿硫的形式存在,汞主要赋存于黄铁矿中,煤中硫和汞有很好的相关性;在ZY煤中,硫主要以有机硫的形式存在,汞主要赋存于黏土矿中,汞与硫不存在相关性。

Two coals from different coal mines, Liuzhi （LZ） and Zunyi （ZY） in the Guizhou province, with high mercury （Hg） and sulfur （S） contents were studied in this article. Different methods were used to identify the occurrence and correlation of Hg and S in the two coals, such as, float-sink test, sequential leaching test, low temperature ashing （LTA）, and also X-ray diffraction （XRD）. The results show that the sulfur forms are different in the two coals. Sulfur in the LZ coal is mainly in the pyritic form and in the ZY coal, in the organic form. Mercury is mainly associated with pyrite for LZ coal and with clay minerals for ZY coal. In LZ coal, mercury and sulfur have a good correlation, but in ZY coal the correlation between mercury and sulfur is not so good.