Study on Preparation of Sodium Silicate from Red Mud

Abstract

Abstract: In order to extract and utilize the silicon element in red mud, a new raw material was found for the preparation of sodium silicate. In this paper, the chemical composition and mineral composition of red mud of Chalco Shanxi New Materials Co., Ltd. were analyzed by chemical analysis and XRD. The results show that the red mud is an ideal silicon source for the preparation of sodium silicate, because of its high content of amorphous silica and high reactivity. Silica gel with purity of 92% is obtained by acid leaching red mud. The optimum technological parameters of sodium silicate prepared by silica gel wet method are NaOH mass concentration of 15%, liquid-solid mass ratio of 3, system temperature of 95 ℃, reaction time of 15 min. The dissolution rate of silica under the optimal parameters is 91%, and the utilization rate of silicon in the red mud is 84.6%. This study provides a new idea and basis for the resource recovery of red mud and raw material selection of sodium silicate.

Key words: red mud, silicon dioxide, silica gel, wet process, sodium silicate

CLC Number:

TQ170

SHI Guoyi, PAN Aifang, MA Yuzhao, SUN Yue, CHANG Jie, YANG Ling, DUAN Yuyu. Study on Preparation of Sodium Silicate from Red Mud[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2020, 39(12): 3913-3917.

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