Experimental parameter optimization study on the acid leaching of coal fly ash

被引：9
|
作者：
Yan, Long [1 ,2 ]
Shang, Junfei [3 ]
Wang, Yufei [1 ,2 ]
Li, Jian [1 ,2 ]
Liu, Huijin [1 ,2 ]
Qu, Tiantian [1 ]
Zhang, Chao [1 ]
机构：
[1] Yulin Univ, Sch Chem & Chem Engn, Yulin Engn Res Ctr Ind Water Treatment, Yulin 719000, Peoples R China
[2] Yulin Univ, Shaanxi Key Lab Low Metamorph Coal Clean Utilizat, Yulin 719000, Peoples R China
[3] Shaanxi Yulin Excelle Coal Chem Ind Co Ltd, Yulin 719000, Peoples R China
来源：
DESALINATION AND WATER TREATMENT | 2016年 / 57卷 / 23期
基金：
中国国家自然科学基金;
关键词：
Coal fly ash; Acid leaching; Orthogonal test; Hydrochloric acid; Specific surface area; WASTE; ADSORPTION; RECOMMENDATIONS; REMOVAL; DYES;
D O I：
10.1080/19443994.2015.1040463
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Coal fly ash from a power plant was leached using HCl. Factors that influenced the leaching process, such as the ratio of coal fly ash to Na2CO3, the HCl concentration, the leaching time, and the temperature, were investigated, and an orthogonal test was used to determine the optimal conditions for acid leaching the coal fly ash. The coal fly ash samples before and after acid leaching were analyzed by scanning electron microscopy, energy dispersive spectroscopy, and Brunauer-Emmett-Teller adsorption analysis. An aluminum leaching rate of 90.68% was obtained using the optimal values of 6g Na2CO3, 100g coal fly ash, 4mol L-1 HCl, 1.5h leaching time, and a temperature of 100 degrees C. The concentrations of Al3+ and Fe2+ plus Fe3+ in the leaching liquid were 34.21 and 30.67g L-1, respectively, using the optimal conditions. The coal fly ash residue had certain specific surface area and absorption features that are described. The results suggest that acid leaching offers benefits in terms of the comprehensive use of coal fly ash.
引用
收藏
页码：10894 / 10904
页数：11
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