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  

Study on the Technology of Preparing Magnesium Oxychloride Cement Material byCalcination Extraction of Lithium By-Product Based on Orthogonal Experiment and Response Surface Method

作　　者：刘盼 肖学英[1,2] 常成功 阿旦春[1,2,3] 李颖 董金美 郑卫新[1,2] 黄青 董飞[1,2,3] 刘秀泉 文静[1,2] LIU Pan;XIAO Xueying;CHANG Chenggong;A Danchun;LI Ying;DONG Jinmei;ZHENG Weixin;HUANG Qing;DONG Fei;LIU Xiuquan;WEN Jing(Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lake,Chinese Academy of Sciences,Xining 810008,China;Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province,Xining 810008,China;University of Chinese Academy of Science,Beijing 100049,China)

机构地区：[1]中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效重点实验室,西宁810008 [2]青海省盐湖资源化学重点实验室,西宁810008 [3]中国科学院大学,北京100049

出　　处：《材料导报》2020年第S02期308-314,共7页Materials Reports

基　　金：青海省重点研发与转化计划(2019-GX-165);中国科学院青年创新促进会(2018467,2019423)。

摘　　要：为了拓展氯氧镁水泥材料(MOC)用活性氧化镁的来源途径,采用正交试验和响应面分析法研究了煅烧法提锂副产物制备氯氧镁水泥材料的最佳工艺条件。以抗压强度为评价指标,采用三因素四水平正交试验研究了副产物煅烧温度、MgO与MgCl 2的物质的量比以及MgCl 2溶液的波美度对不同龄期氯氧镁水泥材料抗压强度的影响规律。显著性分析结果表明:煅烧温度和MgCl 2溶液波美度是影响氯氧镁水泥材料不同龄期抗压强度的重要因素,而MgO与MgCl 2的物质的量比对氯氧镁水泥材料不同龄期抗压强度的影响不明显。以28 d抗压强度为评价指标,制备氯氧镁水泥材料的最佳工艺条件为:煅烧温度800℃、MgO与MgCl 2的物质的量比8.7、MgCl 2溶液的波美度28。进一步采用响应面分析法和验证试验佐证了正交试验结果的准确性,响应面预测模型对优化材料制备工艺以及预测材料力学性能具有一定的指导意义。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 MgCl 2,and the baume degree of MgCl 2 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 MgCl 2 solution are important factors that affect the compressive strength of magnesium oxychloride cement materials at different ages,while the molar ratio between MgO and MgCl 2 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 MgCl 2,baume degree of MgCl 2 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.

关 键 词：煅烧法提锂 氯氧镁水泥 抗压强度 正交试验 响应面 

分 类 号：TU528[建筑科学—建筑技术科学]