Inhibition of potassium ions on hydration swelling of montmorillonite

被引：0

作者：

Xu Z.-Q. ^{[1
]}

Liu J. ^{[1
]}

Wang H.-F. ^{[1
]}

Zhang Z.-J. ^{[1
]}

机构：

[1] School of Chemical & Environmental Engineering, China University of Mining & Technology, Beijing

来源：

Meitan Xuebao/Journal of the China Coal Society | 2016年 / 41卷 / 02期

关键词：

Hydration swelling; Inhibition; Montmorillonite; Potassium ions;

D O I：

10.13225/j.cnki.jccs.2015.0486

中图分类号：

学科分类号：

摘要：

Montmorillonite is the main factor affecting the settling performance of coal slime water, static settling tests and pressure filtration experiments were designed to study inhibition of potassium ions on hydration swelling of montmorillonite. Volume expansion of montmorillonite in deionized water is 2.3 times greater than the original volume of dry powder, while the volume expansion of montmorillonite in the solution of 0.1 mol/L potassium ions is only 1.8 times greater than the original volume. The filtering speed of montmorillonite in the solution of potassium ions is obviously faster than that in deionized water. Hydration swelling of montmorillonite could be inhibited by potassium ions, and Inhibitive effect of potassium ions on hydration swelling of montmorillonite is better than calcium ions. The inhibitive mechanism of potassium ions on hydration swelling of montmorillonite is that the potassium ion was adsorbed on montmorillonite interlayer, potassium ion is not easy to hydration, the water molecules between the crystal layer is discharged, and the bonding layer between the potassium ions greatly restrain the expansion or separation process of adjacent crystal layers. © 2016, China Coal Society. All right reserved.

引用

页码：464 / 468

页数：4

共 15 条

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