煅烧煤矸石中铝铁和硅组分的硫酸浸出行为差异研究
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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,Al_2O_3 and SiO_2 are 98. 31% 、97. 19% and 15. 88% respectively. And Leaching rate difference between TFe and SiO_2,Al_2O_3 and SiO_2 are 82. 43%,81. 31% respectively. Obviously, the sulfuric leaching can realize clean separation between TFe,Al_2O_3 and SiO_2 in coal gangue. TFe,Al_2O_3 component is concentered in the leachate,SiO_2 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 SiO_2 content as high as 90. 22% is received synchronously.
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,Al_2O_3 and SiO_2 are 98. 31% 、97. 19% and 15. 88% respectively. And Leaching rate difference between TFe and SiO_2,Al_2O_3 and SiO_2 are 82. 43%,81. 31% respectively. Obviously, the sulfuric leaching can realize clean separation between TFe,Al_2O_3 and SiO_2 in coal gangue. TFe,Al_2O_3 component is concentered in the leachate,SiO_2 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 SiO_2 content as high as 90. 22% is received synchronously.
引文
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[3]郭建秋.煤矸石在建材领域的应用[J].能源与节能,2014(3):103-104.
[4]彭富昌,王青松.我国煤矸石的综合利用研究进展[J].能源环境保护,2016,30(1):17-20.
[5]郭彦霞,张圆圆,程芳琴.煤矸石综合利用的产业化及其展望[J].化工学报,2014,65(7):2443-2453.
[6]夏举佩,刘成龙,杨荣.高铁低铝煤矸石酸法提取铝铁研究[J].安全与环境学报,2015,15(3):248-251.
[7]夏举佩,苏毅,周新涛,等.高铁低铝煤矸石酸浸液铝铁分离研究[J].硅酸盐通报,2014,33(6):1459-1463.
[8]孔德顺,王茜,宋说讲.高铁型煤矸石酸浸液制备聚合硫酸铝铁实验研究[J].无机盐工业,2015,47(6):57-59.
[9]李瑜,舒新前,张蕾,等.酸浸法提取煤矸石中Al2O3的研究[J].环境污染与防治,2013,35(7):70-733.
[10]Yanxia Guo,Huibin Lv,Xi Yang,et al.Al Cl3·6H2O recovery from the acid leaching liquor of coal gangue by using concentrated hydrochloric inpouring[J].Separation and Purification Technology,2015,151(4):177-183.
[11]Jin Xiao,Fachuang Li,Qifan Zhong,et al.Separation of aluminum and silica from coal gangue by elevated temperature acid leaching for the preparation of alumina and Si C[J].Hydrometallurgy,2015(155):118-124.
[12]余复幸,夏举佩,周鑫涛.煤矸石酸浸渣干法制备水玻璃研究[J].硅酸盐通报,2014,33(1):170-174.
[13]杨荣,李艳红,夏举佩,等.煤矸石酸渣制备白炭黑的实验研究[J].硅酸盐通报,2013,32(8):1620-1625.
[14]杨胜丹,宗贵仪,郗晓丹,等.焙烧活化对煤矸石中硅元素浸出的影响[J].环境科技,2014,27(2):23-26.
[15]纪利春,相亚军,任根宽.酸碱联合法从低温活化煤矸石提取硅铝铁[J].非金属矿,2015,37(3):12-14.