渭北石炭二叠纪煤中汞的赋存状态研究

Study on occurrence state of mercury in Permian-Carboniferous coal from Weibei area

以渭北石炭二叠纪煤为原料,结合筛分浮沉试验、逐级化学提取试验和数理统计这3种间接方法对煤中汞的赋存状态进行了研究。研究结果表明,原煤中汞主要以硫化物结合态存在,占75%以上,残渣态所占比例次之,有机结合态和可交换态所占比例最小。董家河煤汞含量随着粒度减小而减小,崔家沟煤和王村煤汞含量随着粒度变化没有呈现出明显的变化规律。崔家沟煤汞含量随着密度级增加而增加,且随着密度的变化趋势接近于一元二次函数,浮沉试验各密度级的汞含量与灰分、硫分存在线性正相关性,并且汞含量与硫相关性比灰分要好。

Taking Permian-Carboniferous coal from Weibei area as raw material,occurrence state of mercury was studied by using methods of screening float-and-sink analysis,sequential chemical extraction and mathematical statistics.The results showed that more than 75% of mercury in coal existed in sulfide combined state,and residual form was less,and exchangeable form and organic form were least.The mercury content in coal of Dongjiahe Mine decreased with the decreasing of coal particle size,while there was no obvious change law in Cuijiagou Mine and Wangcun Mine.With the increase of coal density,the mercury content in coal of Cuijiagou Mine increased,and the change rule was close to the unary quadratic function.The results of float-and-sink analysis of different density of coal showed that there was a significant linear positive correlation between mercury content and ash content and between mercury content and sulfur content,and the correlation between mercury content and sulfur content was more obvious.