Pulping Properties and Mechanism of Bentonite Controlled by Polymer

Abstract

Abstract: Based on the test of sodium bentonite with 43% montmorillonite content in Jiangsu province, it was found that the Φ600 of mud was 5 mPa·s, and the filter loss was 27 mL. The bentonite cannot meet the requirements of national standard soil. In this paper, a scheme was proposed to improve the pulping performance by adding different polymers. The influence of polymer on the properties of bentonite slurry was studied by single factor experiment. SEM,FTIR, XRD and Zeta potential were used to investigate the mechanism of the effect of the polymer on the slurry-making properties of bentonite. The optimum polymer composition and dosage were obtained by orthogonal experiment and optimization experiment. The results show that the polymer is adsorbed on the surface of bentonite particles, which is not only beneficial to the formation of hydrogen bond on the crystal surface, but also to the formation of network structure. Which improves the viscosity of the mud, and reduces the loss of mud. When the polymer is 0.1% (mass fraction) sodium polyacrylate+0.4% (mass fraction) carboxymethyl starch, the Φ600 of mud is 60.5 mPa·s, and the filter loss is 14.5 mL. Other properties also met the requirements of the national standard for mud soil.

Key words: montmorillonite, bentonite, pulping property, polymer, mud

CLC Number:

TD985

LI Xin, WU Xuelan, LONG Hongming, WANG Weikui, YU Zhengwei, LI Xiang. Pulping Properties and Mechanism of Bentonite Controlled by Polymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2256-2263.

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