Efficient Desilication by Adsorption with Aluminum Salt-modified Bentonite from Green Liquor

Tao Lin, Xue Li, Yongjian Xu, Xuefeng Yin, Dingjun Zhang, Yong Tian

Abstract


The objective of this work was to investigate the possibility of using Na-bentonite as a raw material to produce aluminum salt-modified bentonite (AlMB) for desilication of green liquor. Batch experiments were carried out by varying the experimental parameters to find the optimum conditions. The optimum adsorbent dose was 20 g/L. The maximum adsorptions of 96.37% and 87.22% took place at pH 7.4 when the initial concentrations of silicate in green liquor were 4 and 6 g/L, respectively. The kinetic models showed that the process included physical adsorption and chemical adsorption. Finally, this study showed that the extent of desorption was 56.78% for silicate after desorption of AlMB in 2 M NaOH solution. The AlMB is an efficient and novel adsorbent for desilicating that can provide a good reference for the “silicon influence” in a papermaking mill.

Keywords


Bentonite; Modification; Aluminum salts; Adsorption; Desilication; Green liquor

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