Researches on Purification and Sodium-Modification of Ca-Bentonite by Tri-Roller Grinder

Abstract:

To fully evaluate the usability of a raw Ca-bentonite source and to deeply understand the property of bentonite mineral are critical for applications of these special layered materials. Due to sodium bentonites have several advantages over calcium bentonites, especially in expansibility, cation exchange capacity, cohesive force, dispersibility, and thermostability, sodium-modification of Ca-bentonite is regarded as a top priority of effective utilization of abundant Ca-bentonite source in China. In present work, the purified Na-montmorillonite was synthesized by purification and sodium-modification of a raw Ca-bentonite source (Liaoning, China) by tri-roller grinder. Important influencing factor rolling times in purification and sodium modification process was investigated. Mineral compositions, microscopic morphology, and thermal stability were characterized by using different techniques. The crystalline phases and compositions were identified by X-ray powder diffraction (XRD). The morphology and structure were evaluated by scanning electron microscopy (SEM). The thermal properties were investigated using differential thermal gravity analysis (DTG) and differential thermal analysis (DTA) analysis.

• Periodical: Advanced Materials Research (Volumes 962-965)
• Pages: 809-813
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.962-965.809
• Online since: June 2014
• Authors: Bing Bing Zhang, Ming Yue Miao, Jing Bai, Guang Jin Yuan, Yan Yan Jia, Zhe Xiang Han, Zhi Guo Zhao, Hai Quan Su*
• Keywords: Ca-Bentonite, Na-Montmorillonite, Sodium Modification, Tri-Roller Grinder

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