利用盐湖提锂尾液制备电池正极材料行业级碱式碳酸镁工艺研究

Study on the Preparation of Industrial Grade Basic Magnesium Carbonate as Cathode Material of Battery by using the Tail Liquid of Extracting Lithium from Salt Lake

在青海锂业有限公司现有电池级碳酸锂生产线基础上,以ED分离尾液和碳沉锂转化尾液为原料,通过正交法试验开发镁、锂综合回收利用工艺路线,生产高附加值的电池正极材料行业级碱式碳酸镁,通过研究确定了最佳操作条件:物料反应配比1∶8~1∶12,反应温度45℃~60℃,反应时间45 min。在此条件制备的碱式碳酸镁满足HG/T 2959-2010的要求。该工艺方法可实现盐湖镁锂资源的综合利用。

On the basis of the existing battery grade lithium carbonate production line of Qinghai Lithium Industry Co.,Ltd.,using the ED separation tail liquid and the carbon precipitation lithium conversion tail liquid as raw materials,the process route of comprehensive recovery and utilization of magnesium and lithium was developed through orthogonal test to produce the industrial grade basic magnesium carbonate,which is a high value-added battery cathode material.Through research,the optimal operating conditions were determined:the material reaction ratio was 1∶8~1∶12,the reaction temperature was 45℃~60℃,and the reaction time was 45 min.The basic magnesium carbonate prepared under this condition meets the requirements of HG/T 2959-2010.The process realizes the comprehensive utilization of magnesium and lithium resources in salt lake.