深度碳化法处理碳酸盐型锂精矿生产电池级碳酸锂

Production of battery-grade lithium carbonate from carbonate-type lithium concentrate by deep carbonization method

西藏有丰富的卤水锂资源,笔者通过多年的研究,开发了一种对西藏扎布耶盐湖卤水中得到的碳酸盐型锂精矿进行加工提纯的新工艺———深度碳化法。在一定的二氧化碳压力、一定的反应温度下,固体碳酸锂精矿可以变为可溶于水的碳酸氢锂,从而与不溶杂质分离,然后经过树脂交换除杂质、加热分解、精制洗涤、烘干、粉碎,得到电池级碳酸锂。这种新工艺与现行的苛化法工艺相比有以下几大优点:工艺简单、流程短、物料流通量小、金属回收率高、污染小、成本低、投资少,是目前最有前途的一条工艺路线。此新工艺已经获得国家发明专利(CN,102502720)。

Tibet has abundant lithium brine resources.Through many years＇research, the author developed a new technology： deep carbonization method for processing and purifying the carbonate-type lithium concentrate from the brine in the Zhabuye salt lake,Tibet.Under a certain CO2 pressure and reaction temperature, solid lithium concentrate could be transformed into the water soluble lithium bicarbonate, so that it could be separated from the insoluble impurities.Then through resin exchange impurity removing,heating decomposition,refining ＆ washing,drying,and crashing,the battery-grade lithium carbonate could be obtained.This new technology had such advantages as simple process, short flow, small material circulation, high metal recovery,less pollution,low cost,and less investment,comparing with the current causticizing process.It＇s the most promising process route at present and it has already got China Invention Patent （CN, 102502720）.