Carbide Battery Lithium Carbonate Pilot Test Successful

On December 6, Lithium industry experts in China jointly developed a deep carbonation process to treat carbonate lithium concentrates to produce battery-grade lithium carbonate. Pilot tests were conducted at Zhabuye Lithium Company in Baiyin, Gansu to produce qualified battery grades. Lithium carbonate product. Compared with the previous causticization process, the deep carbonation process has obvious advantages. The process flow is short, and the product quality is good. The battery-grade lithium carbonate product can be obtained directly, and the cost is reduced by about 20% compared to the causticization process.

According to Peng Qiuhua, deputy general manager of Zabuye Lithium Industry Co., Ltd., responsible for the development of the project, in order to take the lead in the future when lithium-ion batteries enter the market on a large scale, the company researches and develops battery-grade lithium carbonate products required for lithium-powered batteries in advance. In addition to the production layout, on the basis of the original lithium salt production technology with independent intellectual property rights, a number of experts from the domestic lithium industry were introduced. From July of this year, a pilot study on a new process of in-depth carbonation was started. At present, the company is stepping up the design of continuous industrial devices and is preparing to officially transfer to small-batch industrial production at the end of this year to investigate the feasibility of continuous production of the process. Since then, the company plans to use this new process to implement the second phase project with an annual capacity of 10,000 tons of battery-grade lithium carbonate.

It is understood that the current production process of silver lithium Zabuye is the company's original causticization method, and the raw material is the carbonate lithium concentrate extracted from the Zabuye Salt Lake brine in the Xigaze region of Tibet. The lithium concentrate contains about 50% to 75% of lithium carbonate, and also contains a small amount of chloride and sulfate. The products produced are industrial grade lithium carbonate and industrial grade lithium hydroxide monohydrate. The main goal of the newly developed deep carbonation process is to directly produce battery-grade lithium carbonate. The process of lithium metal recycling rate is high, up to more than 94%, 2% higher than the causticization method, while the external slag volume reduction of 90%, tons of coal consumption of less than 2 tons of product, unit product investment only caustic law 2 /3 or so.

Peng Qiuhua told reporters that the deep carbonation process has reduced the three major processes of causticization, six-stage scrubbing, and evaporation and evaporation than the causticization process. The new process first wets the lithium concentrate to a certain degree of fineness, then adds the heated and smelted lithium concentrate to the carbonization tower and carbonizes the carbon in depth. Under a certain pressure of carbon dioxide, the reaction temperature and the end pH, micro The soluble lithium carbonate is converted into water-soluble lithium bicarbonate. They then used the unstable characteristics of lithium bicarbonate to decompose the lithium bicarbonate by heating the solution back to lithium carbonate precipitation, followed by centrifugation, heating and stirring washing to separate from the soluble impurities, to obtain a battery grade lithium carbonate product of desired purity.

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