Study on the Preparation Process of Magnesium-Lithium Mixed Oxide AITranslate

4Yao-Wu Wang,Kun Zhao,Jian-Ping Peng,Yue-Zhong Di,Ying-Long Li,Yang Song,Xin-Zhong Deng.Process of producing magnesium by thermal vacuum reduction using silicocalcium as reductant[J].稀有金属：英文版,2016,0(7):571-575. 被引量：2

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Chinese Library Classification Number:TQ131.11[化学工程—无机化工]

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The preparation process of magnesium-lithium mixed oxide by calcining magnesite and lithium hydroxide monohydrate as raw materials was studied.Through differential thermal-thermogravimetric analysis of raw materials during calcination and X-ray diffraction phase analysis of calcined products,the decomposition process of lithium hydroxide monohydrate in the mixture was discussed.The results show that lithium hydroxide monohydrate is melted at first and then decomposed during direct calcination,while part of Li₂CO₃is generated during calcination of the mixture of lithium hydroxide monohydrate and magnesite,making subsequent decomposition difficult.The calcination process of the mixture of lithium hydroxide monohydrate and calcined magnesite produces a small amount of magnesium hydroxide,but the magnesium hydroxide is quickly decomposed into magnesium oxide,which has no effect on decomposition of lithium hydroxide.When calcination temperature is above 950℃and calcination time reaches 120 min,the decomposition ratio of lithium hydroxide monohydrate in the mixture is over 98%,and the main phases of calcined materials are MgO and Li₂O.