Purification Method of Exchangeable Cations of Calcium Bentonite

PAN Xueying; QIN Liuyang; JI Jingru; CHEN Konglei; ZHAO Yanping; ZHANG Qin

doi:10.12476/kczhly.202211230740

2025 Vol. 46, No. 5

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Article navigation > Multipurpose Utilization of Mineral Resources > 2025 > 46(5): 170-175

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PAN Xueying, QIN Liuyang, JI Jingru, CHEN Konglei, ZHAO Yanping, ZHANG Qin. Purification Method of Exchangeable Cations of Calcium Bentonite[J]. Multipurpose Utilization of Mineral Resources, 2025, 46(5): 170-175. doi: 10.12476/kczhly.202211230740

Citation:

PAN Xueying, QIN Liuyang, JI Jingru, CHEN Konglei, ZHAO Yanping, ZHANG Qin. Purification Method of Exchangeable Cations of Calcium Bentonite[J]. Multipurpose Utilization of Mineral Resources, 2025, 46(5): 170-175. doi: 10.12476/kczhly.202211230740

Purification Method of Exchangeable Cations of Calcium Bentonite

1.
Guangxi Key Laboratory of New Energy and Building Energy Saving, Guilin University of Technology, Guilin, Guangxi 541004, China
2.
Guilin University of Aerospace Technology, Guilin, Guangxi 541004, China

More Information

Corresponding author: ZHANG Qin, zhangqin@glut.edu.cn

Received Date: 23 November 2022

Publish Date: 25 October 2025

Abstract

Abstract

The properties of bentonite are influenced by the type and content of exchangeable cations. The content of single-type cations can be increased by purification, thereby improving the properties of bentonite (such as the properties of adsorption, dispersion and expansion). The Gaomiaozi (GMZ) bentonite was used as the tested materials. Purification of exchangeable cations was first carried out through the immersion-dialysis method, and the cations was exchanged by using NH₄Cl-C₂H₅OH solution. Inductively coupled plasma mass spectrometry (ICP-MS) was used to determine the species and content of exchangeable cations. The experimental results show that the use of dialysis to wash salt can significantly improve the soil sample recovery rate,which is above 96%, and the salt washing time is about 3 days. After the bentonite is repeatedly exchanged with the NH₄Cl-C₂H₅OH solution for 5 times, the exchangeable cations can be replaced completely.The exchangeable sodium percentages of GMZ bentonite was 72.12%, the exchangeable potassium percentage was 82.60%, and the exchangeable calcium percentage was 88.16%, respectively. The purification rate of single-type exchangeable cations has been greatly increased. The purification of bentonite by dialysis is simple and effective, which is worthy of further study.
- bentonite /
- exchangeable cations /
- dialysis method /
- purification rate /
- ICP-MS

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References

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