High-purity lithium chloride production technology

Abstract

The invention discloses a high-purity lithium chloride production technology. An apparatus in the production technology comprises a filter press, a blending pot for acid adjusting treatment, an extraction system, a washing system and a back-extraction system connected by the multistage centrifugation extraction machines in series respectively, an iron-removal system and an oil removing system which are connected in order through the pipelines, wherein, an output terminal of a back extraction solution of the back-extraction system is connected with the washing system, an organic phase output terminal of the back-extraction system is connected with a saponification system, the saponification system is connected with the extraction system; and the extraction system, the washing system, the back-extraction system and the saponification system form a circulation loop. The apparatus also comprises a data analysis system capable of switching an abnormal centrifugation extraction machine station to a backup centrifugation extraction machine. A frequency-conversion closed loop flow control system is arranged at a material input of each system of the circulation loop, and the accurate flowing and input phase ratio can be obtained by appropriate adjusting. The apparatus has the advantages of high extraction efficiency, fast establishing time for phase equilibrium, small solvent required amount, small consumption of a solvent, and continuous and reliable processes.

Description

[0001] This application is a divisional application of an invention patent with an application date of July 13, 2016, an application number of "201610550355.7", and an invention titled "a high-purity lithium chloride extraction device". technical field [0002] The invention belongs to the field of inorganic salt chemical industry, and in particular relates to a production process of high-purity lithium chloride. Background technique [0003] Lithium chloride is mainly used in air-conditioning dehumidifiers, bleaching powder, insecticides, synthetic fibers, pharmaceutical industry, lithium battery electrolytes, metal alloy welding agents or fluxes, and another very important use is for the production of lithium metal, lithium It is an urgently needed strategic material for the development of the national economy and national defense construction. The only industrial method for producing metal lithium is proposed by Gantz in 1893, that is, the lithium chloride molten salt elec...

AI Technical Summary

Problems solved by technology

Traditional solvent extraction methods generally use static extraction tanks and extraction chambers as the main extraction tools, which have the following disadvantages: 1. Large solvent demand, high consumption, and high cost; 2. Low extraction efficiency, many stages required, and difficult to obtain purity High product; 3. It takes a long time to establish phase equilibrium, and the extraction process is unstable; 4. The operation and maintenance are cumbersome, with many supporting equipment, high labor intensity, and too large an area, etc.

The above reasons have hindered the popularization and application of solvent extraction in the process of extracting lithium, and also hindered the industrial production of high-purity lithium chloride

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