Novel method for removing fluorine by lithium carbonate prepared by utilizing tantalum-niobium tailing lepidolite

The invention discloses a novel method for removing fluorine by lithium carbonate prepared by utilizing tantalum-niobium tailing lepidolite, wherein a method for acid leaching and neutralization fluorine removal by adding dilute sulfuric acid solution in lithium carbonate raw material is adopted. The method is characterized by comprising the steps of: crushing lithium mica powder to about 200 meshes; inputting the lithium mica powder and sulfuric acid solution with concentration of 30-70% into a reaction device according to solid-liquid mass ratio of 1: 2-8 so as to carry out acid leaching and fluorine removal reaction for 3-10h at a temperature of 60-200DEG C; vacuumizing to separate generated hydrofluoric acid after the reaction so as to obtain solid-liquid mixed solution; and filtering and removing the slag to obtain mother solution I, wherein the neutralization fluorine removal comprises the step of adding calcium hydroxide after adding water equal to the separated hydrofluoric acid solution in the solid-liquid mixed solution and the pH in the solution is controlled within 9-12.