Method for recovering lithium in mother liquor of process for producing lithium carbonate from spodumene through sulfuric acid process

Abstract

The invention discloses a method for recovering lithium in mother liquor of a process for producing lithium carbonate from spodumene through a sulfuric acid process. The method is used for solving the problems that second-grade lithium carbonate and first-grade lithium carbonate are low in yield, and soluble impurities (SO4<2->, K<+> and Cl<->) in the mother liquor return to the system to affect the product quality in a method for recovering lithium in the lithium carbonate mother liquor in the prior art. The method disclosed by the invention mainly comprises the steps: concentrating lithium carbonate mother liquor; reacting to generate lithium stearate and separating the lithium stearate; and reacting to produce lithium sulfate and conveying the lithium sulfate to a lithium sulfate liquid storage tank. The method solves the problems of recovery of lithium in the lithium carbonate mother liquor and product quality, increases the yield of first-grade lithium carbonate, prevents the soluble impurities (SO4<2->, K<+> and Cl<->) from returning to the system and guarantees the product quality.

Description

technical field [0001] The invention belongs to the technical field of production of lithium carbonate by a mining method, and in particular relates to a method for recovering lithium in a mother liquor of a process for producing lithium carbonate by a spodumene sulfuric acid method. Background technique [0002] At present, the production process of lithium carbonate by mining method mainly includes processes such as roasting, ball milling, acidification, leaching, filtration, smelting, freezing, evaporation and cooling crystallization and separation. [0003] For example, the patent of invention with application number 201310243237.8 discloses a method for producing high-purity lithium carbonate from lithium concentrate. The method comprises the following steps: [0004] (1) Steps for preparing acid clinker: Lithium concentrate is first calcined in a rotary kiln at 1000-1150°C and transformed into roasted material, then the roasted material is cooled to 80-145°C by a coole...

AI Technical Summary

Problems solved by technology

[0019] The present invention produces secondary product lithium carbonate, first-grade product lithium carbonate yield low in order to solve prior art to the recovery method of lithium in lithium carbonate mother liquor, soluble impurity (SO in mother liquor) 4 2- 、K + , Cl - ) returns to the problem that the system affects product quality, and provides a method for recovering lithium in the lithium carbonate mother liquor produced by the spodumene sulfuric acid method, which solves the problems of lithium recovery and product quality in the lithium carbonate mother liquor, and improves the quality of the first-grade product. The yield of lithium carbonate prevents soluble impurities (SO 4 2- 、K + , Cl - ) back to the system to ensure the quality of the product