Effect of Salt in Aqueous Solution on the Swelling and Water-Retention Capacity of Bentonite

Abstract:

The swelling and water-retention capacity of bentonite in saline water are the important application properties of bentonite as the raw material of GCLs. In this paper, the swelling volumes and the filter loss of six kinds of Na-bentonite samples hydrated with different concentrations of NaCl, CaCl₂, and MgCl₂ solutions were investigated. In addition, the ion-exchange properties of raw materials, the morphology and structure analysis of the samples soaked in the salt solution were discussed. The results show that the water-retention capacity of bentonite decreases with the increase of salt concentration in aqueous solution; And at the same mass concentration, the water-retention capacity in MgCl₂ solution decreases most, followed by CaCl₂ and the least is NaCl. The water-retention capacity of bentonite in saline water is related with ENa⁺. The larger the ENa⁺ is, the better the chemical resistance of bentonite is.

• Periodical: Advanced Materials Research (Volumes 194-196)
• Pages: 2039-2045
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.194-196.2039
• Online since: February 2011
• Authors: Zhi Ming Sun, Jian Yu, Shui Lin Zheng, Chun Hua Bai
• Keywords: Bentonite, Filter Loss, Saline Water, Swelling Characteristic, Water-Retention Capacity

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