Method for purifying lithium carbonate

A technology of lithium carbonate and hydrogenation solution, applied in the direction of lithium carbonate; The effect of high main content of the product
CN102531002AActive Publication Date: 2012-07-04天齐锂业(射洪)有限公司
5 Cites 38 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
天齐锂业(射洪)有限公司
Publication Date
2012-07-04

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to a method for purifying lithium carbonate, belonging to the technical field of the preparation of high-purity lithium carbonate. The method is characterized by safe production process and high lithium yield. The method comprises the following specific steps: (1) washing lithium carbonate to be purified to remove impurities, and adding water to prepare lithium carbonate slurry; (2) introducing CO2 into the lithium carbonate slurry prepared in the step (1) to carry out hydrogenation reaction, stopping introducing CO2 when the concentration of lithium oxide concentration in a solution is 10-30g / L, and filtering the solution to obtain a hydrogenated solution, wherein the hydrogenation reaction is carried out at the pressure of 0.2-0.6Mpa and the temperature of 20-30 DEG C; (3) subjecting the hydrogenated solution obtained in the step (2) to an ion exchange resin to remove impurity ions in the hydrogenated solution; and (4) heating the hydrogenated solution in which the impurity ions are removed in the step (3) to 70-90 DEG C to carry out decomposition reaction, separating solid from liquid to obtain the wet lithium carbonate, and drying the wet lithium carbonate. The produced battery-level lithium carbonate has high main content, excellent quality and stable performance.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a method for purifying lithium carbonate, which belongs to the technical field of preparation of high-purity lithium carbonate. technical background

[0002] Lithium carbonate is a basic compound of lithium, which has many industrial uses and is widely used in ceramics, glass, atomic energy, aerospace and lithium batteries, lithium alloys, medicine and other fields. In addition, lithium carbonate, as a basic raw material for lithium, can be converted into various other lithium compounds. Battery-grade lithium carbonate is mainly used to produce lithium-ion battery cathode materials such as lithium cobaltate, lithium iron phosphate, lithium nickelate, lithium manganate or lithium nickel-cobalt manganese oxide. % speed increase. Battery-grade lithium carbonate is mainly produced by one-step sulfuric acid method with spodumene as raw material, lithium hydroxide carbonization method, deep hydrogenation of lithium carbonate to lit...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More