Patent ID: 10745287

Abstract:
A method for preparing industrial grade lithium carbonate from crude lithium fluoride includes the following steps: a, pulping by stirring crude lithium fluoride into a pulp, and adding an acid to prepare a crude lithium fluoride pulp-like material; b, double decomposition by adding the lithium fluoride pulp-like material obtained in the step a into a boiling calcium chloride solution, and then adding an alkaline substance to obtain a lithium chloride solution; c, lithium carbonate precipitation by heating the lithium chloride solution obtained in the step b, adding a carbonate solution according to the mass of lithium in the lithium chloride solution, stirring at a constant temperature, and filtering, wherein the filter cake is a lithium carbonate product. The lithium fluoride is decomposed at one time in a low-acidity environment; fluoride ions are removed; and a double decomposition reaction is used to decompose the lithium fluoride into lithium ions and calcium fluoride precipitates.