Preparation method and preparation system of battery-grade rare earth electrolyte

Abstract

The invention discloses a preparation method of a battery-grade rare earth electrolyte. A finished product is prepared by subjecting lanthanum cerium carbonate, lithium fluoride, potassium fluoride and the like to fluoridation reaction with hydrogen fluoride. The invention also provides a preparation system of the battery-grade rare earth electrolyte. The preparation system comprises a main fluorination furnace and a raw material fluorination furnace, wherein a discharge port of the raw material fluorination furnace communicates with a feed end of the main fluorination furnace through a connecting pipe; and the raw material fluorination furnace comprises a furnace body, reaction chambers are arranged in the furnace body from top to bottom at intervals, the reaction temperatures of the reaction chambers rise in sequence, every two adjacent reaction chambers are separated through a heat insulation baffle and communicate through material holes in the heat insulation baffle, material switches are arranged at the material holes, a feeding pipe is arranged at the reaction chamber on the uppermost layer of the furnace body, and a stirring part rotating around the axis of the furnace body is arranged in the reaction chamber. The invention aims to improve the quality of the prepared electrolyte.

Description

technical field [0001] The invention relates to the field of electrolytes, in particular to a method and system for preparing battery-grade rare earth electrolytes. Background technique [0002] The common preparation process of electrolytes used in batteries and other products is to put rare earth + lithium fluoride into the fluorination furnace, and the electric heating rod and other heating devices in the fluorination furnace heat the furnace, and then add hydrogen fluoride gas, etc. and rare earth , lithium fluoride, etc. to react to obtain finished products. However, in the existing preparation process, the reaction decomposition temperature of each component of the material is different, which leads to incomplete fluorination of some materials, thereby affecting the quality of the finished product. Contents of the invention [0003] The object of the present invention is to address the above problems and provide a method for preparing a battery-grade rare earth elec...

AI Technical Summary

Problems solved by technology

[0005] 1) Add lanthanum cerium carbonate to the fluorination system and hydrogen fluoride gas to carry out fluorination by means of staged temperature rise. After fluorination of lanthanum cerium carbonate, rare earth fluoride is obtained. The fluorination temperature is 100-500 degrees Celsius and the time is 4-8 Hours, by raising the temperature in stages, the problem of incomplete fluorination caused by the different reaction and decomposition temperatures of each element is solved; the REO of lanthanum cerium carbonate is greater than 45%;

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