煅烧煤矸石中铝铁和硅组分的硫酸浸出行为差异研究  

Leaching behavior differences between aluminum,iron and silicon components in calcined coal gangue using sulfate acid as an agent

作　　者：杨慧芬[1,2] 张伟豪[1,2] 宋荣龙 江波[1,2] 

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]金属矿山高效开采与安全教育部重点实验室,北京100083

出　　处：《煤炭工程》2018年第1期117-120,共4页Coal Engineering

摘　　要：以硫酸为浸出剂对古交东曲矿煤矸石中铝、铁、硅组分的浸出行为差异进行了研究。结果表明,煤矸石中铝、铁和硅组分的硫酸浸出行为差异很大。在硫酸浓度7.5mol/L、液固比4:1、120℃浸出150min,TFe、Al_2O_3、SiO_2的浸出率分别为98.31%、97.19%和15.88%,TFe、Al_2O_3和SiO_2的浸出率差异分别达到82.43%、81.31%。显然,硫酸浸出可实现煤矸石中TFe、Al_2O_3和SiO_2的清洁分离,使TFe、Al_2O_3组分富集到浸出液中,SiO_2组分富集到浸出渣中。最终获得了pH<3、Al、Fe元素含量分别为10.2g/L和3.4g/L的浸出液和SiO_2含量高达90.22%的浸出渣。Leaching behavior differences of aluminum,iron and silicon components from coal gangue in Gujiao Dongqu Mining Area are studied using sulfuric acid as leaching agent. The results show that the leaching differences between aluminum,iron and silicon components in coal gangue were very obvious. Under the optimal conditions of sulfuric concentration of 7. 5 mol/L,liquid-to-solid ratio of 4： 1℃,120℃ for 150 min,the leaching ratios of TFe,Al2O3 and SiO2 are 98. 31% 、97. 19% and 15. 88% respectively. And Leaching rate difference between TFe and SiO2,Al2O3 and SiO2 are 82. 43%,81. 31% respectively. Obviously, the sulfuric leaching can realize clean separation between TFe,Al2O3 and SiO2 in coal gangue. TFe,Al2O3 component is concentered in the leachate,SiO2 component is enriched in the leaching residue. The Al and Fe element content in eventual leachate are 10. 2 g/L and 3. 4 g/L respectively and the p H 3. The leaching residue with SiO2 content as high as 90. 22% is received synchronously.

关 键 词：煤矸石 硫酸 组分 浸出率差异 分离 

分 类 号：TD849.5[矿业工程—煤矿开采] X752[矿业工程—矿山开采]