山西煤中有害微量元素分布特征与富集规律

为进一步厘清山西煤中有害微量元素的分布与富集规律,在综合前人研究的基础上,分析了山西煤中4种常见有害元素氟、氯、砷、汞的分布特征和富集规律。研究发现,山西煤中有害元素总体具有低氟、高氯的特点,石炭-二叠纪煤低氟、低砷、低汞、高氯,侏罗纪煤高汞、高砷、高氯、低氟;氯主要富集于西山矿区、霍州矿区,砷主要富集于大同侏罗纪矿区和沁水煤田武夏矿区,汞主要富集于平朔矿区和西山矿区;控制山西煤中有害元素富集的主要因素有聚煤环境、沉积物源性质和岩浆热液活动。建议对煤中有害元素的赋存状态进行深入研究,以提高煤炭分选效果,同时改进分选方法,在分选的同时对有害元素进行固定,防止和减少二次污染;在对粉煤灰中有益元素进行提取利用时建议进行技术、经济和环境指标的综合评价。

Distribution characteristics and enrichment regularity of harmful trace elements in Shanxi coal

In order to further clarify the distribution and enrichment characteristics of harmful trace elements in Shanxi coal and promote the clean and efficient utilization of coal,four common harmful elements such as fluorine,chlorine,arsenic and mercury in Shanxi coal were discussed.It is found that the harmful elements in Shanxi coal have the characteristics of low fluorine and high chlorine,and carboniferous Permian coal are low fluorine,low arsenic,low mercury,high chlorine,and Jurassic coal are high mercurg,high arsenic,high chlorine and low fluoride.Chlorine is mainly enriched in Xishan mining area and Huozhou mining area.Arsenic is mainly concentrated in Datong Jurassic mine and Qinshui coal field Wuxia mining area.Mercury is mainly concentrated in Pingshuo mining area and Xishan mining area.The main factors controlling the enrichment of harmful elements in Shanxi coal are coal accumulation environment,sedimentary source properties and magmatic hydrothermal activity.It is suggested that the occurrence of harmful elements in coal should be further studied in order to improve the effect of coal washing and improve the washing method.The harmful elements should be fixed at the same time,and the secondary pollution should be prevented and reduced.In the use of useful elements extracting from fly ash,technical,economic and environmental indicators should be comprehensive evaluated.