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Method for purifying lithium carbonate

A technology of lithium carbonate and hydrogenation solution, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problems of unstable product performance, leaking, high recovery rate, etc., and achieve high quality and high main content of the product , The effect of production process safety

Active Publication Date: 2013-08-14
天齐锂业(射洪)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the decomposition process LiHCO 3 The wall sticking is very serious, and it decomposes violently and releases a large amount of CO 2 Gas, if the production process is not properly controlled, it is prone to "sink" accidents
In addition, the hydrogenation temperature has a large recovery rate of lithium, resulting in very unstable product performance

Method used

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  • Method for purifying lithium carbonate
  • Method for purifying lithium carbonate
  • Method for purifying lithium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Present embodiment 1 method comprises the following steps (see figure 1 ):

[0051] 1. Add the defective lithium carbonate to water and stir wash it once according to the liquid-solid ratio of 3:1, remove the impurity ions wrapped in the defective lithium carbonate, and obtain the crude lithium carbonate; 2 CO 3 :H 2 The ratio of 0=1:15 lithium carbonate crude product is added in water and stirred, is configured into lithium carbonate slurry;

[0052] 2. Control the temperature of the lithium carbonate slurry at 20°C, and inject CO 2 Gas, keep the pressure in the hydrogenation tank at 0.2Mpa, hydrogenation reaction occurs with lithium carbonate, stop ventilation when the concentration of lithium oxide in the solution is 10g / L, and filter the solution to obtain hydrogenated liquid. Pass the hydrogenation solution through D732 ion exchange resin at 8BV / h to remove impurity ions in the hydrogenation solution. The hydrogenated solution after impurity removal is slowly ...

Embodiment 2

[0055] Present embodiment 2 method comprises the following steps (see figure 1 ):

[0056] 1. Add defective lithium carbonate to water and stir wash once in the ratio of liquid-solid ratio 3.5:1, remove impurity ions wrapped in defective lithium carbonate (A), obtain lithium carbonate crude product; 2 CO 3 :H 2 The ratio of 0=1:28 lithium carbonate crude product is added in water and stirred, is configured into lithium carbonate slurry;

[0057] 2. Control the temperature of the lithium carbonate slurry at 25°C, and inject CO 2 Gas, keep the pressure in the hydrogenation tank at 0.4Mpa, hydrogenation reaction occurs with lithium carbonate, stop ventilation when the concentration of lithium oxide in the solution is 20g / L, and filter the solution to obtain hydrogenated liquid. Pass the hydrogenation solution through D401 ion exchange resin at 10BV / h to remove impurity ions in the hydrogenation solution. The hydrogenation solution after impurity removal is slowly heated (at ...

Embodiment 3

[0060] This embodiment includes the following steps (see figure 1 ):

[0061] 1, by the ratio of liquid-solid ratio 4: 1, the defective lithium carbonate is added to water and stirred and washed once, and the impurity ions wrapped in the defective lithium carbonate (A) are removed to obtain lithium carbonate crude product; 2 CO 3 :H 2 The ratio of 0=1:38 lithium carbonate crude product is added in water and stirred, is configured into lithium carbonate slurry;

[0062] 2. Control the temperature of the lithium carbonate slurry at 30°C, and inject CO 2 Gas, keep the pressure in the hydrogenation tank at 0.6Mpa, hydrogenation reaction occurs with lithium carbonate, stop ventilation when the concentration of lithium oxide in the solution is 28g / L, and filter the solution to obtain hydrogenated liquid. Pass the hydrogenation solution through D751 ion exchange resin at 15BV / h to remove impurity ions in the hydrogenation solution. The hydrogenation solution after impurity remov...

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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.

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

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/08
Inventor 金鹏涂明江梁平武江虎成勾海霞
Owner 天齐锂业(射洪)有限公司
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