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铵盐对次烟煤和二氧化硅吸附行为及表面特性的影响

Effect of Ammonium Salt on the Adsorption Behavior and Surface Characteristics of Sub-Bituminous Coal and Silica.

作者信息

Li Yonggai, Nie Qingmin, Chen Jianzhong, Shen Lijuan, Li Jiawei

机构信息

Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China.

出版信息

ACS Omega. 2019 Jun 17;4(6):10455-10462. doi: 10.1021/acsomega.9b00466. eCollection 2019 Jun 30.

DOI:10.1021/acsomega.9b00466
PMID:31460141
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6648452/
Abstract

Ammonium salt is a common collector in coal reverse flotation. This study compared the difference of adsorption behavior on ammonium salt Lilaflot D817M between sub-bituminous coal and silica as well as the surface characteristic change after being processed by ammonium salt. The results indicate that the adsorption capacity of sub-bituminous coal is always higher than that of silica under different experimental conditions, such as different initial concentrations of ammonium salt, different adsorption times, different concentrations of the depressant dextrin, and different pH values. Ammonium salt could increase the isoelectric point of both silica and sub-bituminous coal greatly. However, the hydrophobicity of silica enhances much more significantly than that of sub-bituminous coal after being treated by Lilaflot D817M. This indicates that the surface wettability change degrees of sub-bituminous coal and silica after being treated by ammonium salt are not proportional to the adsorption capacity because of their different surface structures. The reverse flotation test result shows that 2 kg/t Lilaflot D817M dosage could help obtain relatively good flotation indexes.

摘要

铵盐是煤炭反浮选中常用的捕收剂。本研究比较了次烟煤和二氧化硅对铵盐Lilaflot D817M的吸附行为差异以及经铵盐处理后的表面特性变化。结果表明，在不同实验条件下，如不同的铵盐初始浓度、不同的吸附时间、不同的抑制剂糊精浓度和不同的pH值，次烟煤的吸附容量始终高于二氧化硅。铵盐可大幅提高二氧化硅和次烟煤的等电点。然而，经Lilaflot D817M处理后，二氧化硅的疏水性增强幅度比次烟煤大得多。这表明，由于次烟煤和二氧化硅的表面结构不同，经铵盐处理后它们的表面润湿性变化程度与吸附容量不成正比。反浮选试验结果表明，2 kg/t的Lilaflot D817M用量有助于获得相对较好的浮选指标。

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本文引用的文献

1
Effect of Dextrin on the Adsorption Behavior and Surface Characteristics of Sub-Bituminous Coal and Silica.糊精对次烟煤和二氧化硅吸附行为及表面特性的影响
ACS Omega. 2019 Apr 22;4(4):7231-7236. doi: 10.1021/acsomega.9b00601. eCollection 2019 Apr 30.