Method for cyclically using lithium deposition for preparing sodium carbonate solution to produce lithium carbonate

Abstract

The invention discloses a method for producing lithium carbonate by circularly applying mother solution from which lithium is subsided to prepare a sodium carbonate solution, which comprises the sequential steps such as refrigerating the mother solution from which lithium is subsided, filtering the mother solution from which sodium is sought out, heating the purified liquid of the mother solution from which the sodium is sought out, sweating out the mother solution to prepare the sodium carbonate solution, and performing reaction of the sodium carbonate solution with the lithium sulfate solution so that lithium is subsided. The invention has the characteristics of high lithium sedimentation efficiency, simple technique, stable product, high production efficiency, high recovery rate, low consumption of sodium carbonate, low energy consumption and low cost.

Description

Technical field:

[0001] The invention relates to a method for recycling lithium-precipitating mother liquor for preparing sodium carbonate solution to produce lithium carbonate. Background technique:

[0002] Lithium is a rare resource, but lithium and lithium compounds are widely used in more and more fields. How to make full use of lithium resources while taking into account energy saving and consumption reduction is a common concern of enterprises and society.

[0003] In the production of lithium carbonate by the traditional sulfuric acid method, the balance of process liquid volume is the key issue to solve the recovery rate of lithium. If the liquid volume is unbalanced, the amount of water with lithium is lost more, and the loss of lithium is also more; the longer the route of water circulation with lithium, the greater the loss of lithium. Therefore, the production of lithium carbonate by sulfuric acid method is one of the keys to the process technology to solve the...