Study on the Technology of Preparing Magnesium Oxychloride Cement Material by Calcination Extraction of Lithium By-Product Based on Orthogonal Experiment and Response Surface Method
LIU Pan1,2,3, XIAO Xueying1,2, CHANG Chenggong1,2, A Danchun1,2,3, LI Ying1,2, DONG Jinmei1,2, ZHENG Weixin1,2, HUANG Qing1,2,3, DONG Fei1,2,3, LIU Xiuquan1,2,3, WEN Jing1,2
1 Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lake, Chinese Academy of Sciences, Xining 810008, China 2 Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China 3 University of Chinese Academy of Science, Beijing 100049, China
Abstract: In order to expand the source of active magnesium oxide for magnesium oxychloride cement materials, the optimum technological conditions for the preparation of magnesium oxychloride cement from the by-product of lithium extraction by calcination were studied by orthogonal test and response surface analysis. The effects of calcination temperature, molar ratio between MgO and MgCl2, and the baume degree of MgCl2 solution on the compressive strength of magnesium oxychloride cement at different ages were studied by using the three-factor and four-level ortho-gonal test, with the compressive strength as the evaluation index. The significance analysis results show that the calcination temperature and the baume degree of MgCl2 solution are important factors that affect the compressive strength of magnesium oxychloride cement materials at different ages, while the molar ratio between MgO and MgCl2 had no obvious effect on the compressive strength of magnesium oxychloride cement at different ages. Taking the 28 d compressive strength as an evaluation index, the best technological conditions for the preparation of magnesium oxychloride cement materials were as follows: calcination temperature 800 ℃, molar ratio 8.7 between MgO and MgCl2, baume degree of MgCl2 solution 28. The accuracy of the orthogonal test results is proved by response surface analysis and verification test. The response surface prediction model has certain guiding significance for optimizing the material preparation process and predicting the mechanical properties of materials.
刘盼, 肖学英, 常成功, 阿旦春, 李颖, 董金美, 郑卫新, 黄青, 董飞, 刘秀泉, 文静. 基于正交试验和响应面法优化煅烧法提锂副产物制备氯氧镁水泥材料的工艺研究[J]. 材料导报, 2020, 34(Z2): 308-314.
LIU Pan, XIAO Xueying, CHANG Chenggong, A Danchun, LI Ying, DONG Jinmei, ZHENG Weixin, HUANG Qing, DONG Fei, LIU Xiuquan, WEN Jing. Study on the Technology of Preparing Magnesium Oxychloride Cement Material by Calcination Extraction of Lithium By-Product Based on Orthogonal Experiment and Response Surface Method. Materials Reports, 2020, 34(Z2): 308-314.
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2020, Vol. 34 
