Hydrothermal purification method

A purification method, hydrothermal technology, which is applied in the field of purification, can solve the problems such as the lack of purification of lithium carbonate, achieve the effect of small loss rate, reduce waste, and reduce processing procedures

Inactive Publication Date: 2018-05-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method uses hydrothermal reaction to prepare lithium carbonate, but it does not provide the enlightenment of adopting hydrothermal method to purify lithium carbonate

Method used

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Examples

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Embodiment 1

[0079] A method for purifying lithium carbonate, said method comprising the steps of:

[0080] (1) Lithium carbonate to be purified (Li 2 CO 3 ) and distilled water (or Li 2 CO 3 Saturated solution) is mixed by the solid-to-liquid ratio of 1g: 3mL to make slurry to obtain a slurry; wherein, the lithium carbonate to be purified is industrial grade lithium carbonate, and its purity is 98.5wt%, which contains Na + 0.27wt%, K + 0.12wt%, SO 4 2- 0.51wt%;

[0081] (2) Put the slurry in the hydrothermal reaction device and seal it, raise the temperature of the hydrothermal reaction device to 110°C within 20 minutes, carry out hydrothermal purification, and keep it for 30 minutes to obtain the hydrothermal purification product;

[0082] (3) Centrifuge the hydrothermally purified product at 80°C to obtain solid S1 and solution L1;

[0083] (4) Solid S1 replaces the lithium carbonate to be purified, and L1 replaces distilled water and repeats steps (1)-(3) to obtain solid S2 and s...

Embodiment 2

[0089] A kind of method of purifying lithium carbonate, described method is except that the temperature of hydrothermal purification in step (2) is 130 ℃, all the other are identical with embodiment 1.

[0090] Dry the solid S3 at 80°C for 1 hour, accurately weigh 0.1g of solid S3 and dissolve it in distilled water, and set the volume to 250mL to make a sample. Use ICP-OES to measure the concentration of Na and K elements in the sample, and convert them into elements in solid S3 The content, the result is: Na: 0.015wt%, K: 0.010wt%. The removal rates of the two impurity elements reached 94wt% and 92wt%, respectively. Li 2 CO 3 The purity is 99.6wt%, and the recovery rate is 96.7wt%.

Embodiment 3

[0092] A kind of method of purifying lithium carbonate, described method is except that the temperature of hydrothermal purification in step (2) is 180 ℃, all the other are identical with embodiment 1.

[0093] Dry the solid S3 at 80°C for 1 hour, accurately weigh 0.1g of solid S3 and dissolve it in distilled water, and set the volume to 250mL to make a sample. Use ICP-OES to measure the concentration of Na and K elements in the sample, and convert them into elements in solid S3 The content, the result is: Na: 0.016wt%, K: 0.011wt%. The removal rates of the two impurity elements reached 94wt% and 91wt%, respectively. Li 2 CO 3 The purity is 99.7wt%, and the recovery rate is 96.7wt%.

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Abstract

The invention provides a hydrothermal purification method. The method comprises hydrothermal purification, wherein hydrothermal purification comprises steps as follows: (1) a to-be-purified substanceand water are mixed, and slurry is obtained, wherein a target material in the to-be-purified substance is an insoluble substance and/or a slight soluble substance, and impurities in the to-be-purifiedsubstance are freely soluble substances; (2) the slurry is put in a hydrothermal reaction device, the hydrothermal reaction device is sealed to be heated to 110 DEG C or above for hydrothermal purification, and a hydrothermal purification product is obtained. The method also comprises the step (3): the hydrothermal purification product is subjected to solid-liquid separation, a solid and a liquidare obtained, and the solid is the purified to-be-purified substance. The method comprises simple procedures, the impurity removal rate and the yield of lithium carbonate are high, no new chemical reagents are used, no pollution is caused to the product, energy consumption is low, the production cost is low, and the method is applicable to industrial production.

Description

technical field [0001] The invention belongs to the technical field of purification, relates to a hydrothermal purification method, in particular to a method for hydrothermal purification of lithium carbonate. Background technique [0002] Battery-grade lithium carbonate is an important raw material for the preparation of lithium iron phosphate, lithium manganate and other battery cathode materials. With the warming up of low-carbon economy and new energy industry, the application range of lithium carbonate continues to expand, and the demand for lithium carbonate is increasing. Its purity requirements Also getting higher and higher. [0003] Industrial production of lithium mainly relies on salt lake brine and spodumene metallurgy. Limited by its own conditions, the primary lithium products are all industrial grade lithium carbonate. In recent years, with the maturity of lithium extraction technology, the international market supply and demand of industrial grade lithium ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08C01F5/14C01F11/18C01F17/00
CPCC01D15/08C01F5/145C01F11/185C01F11/188C01F17/247C01P2004/03C01P2006/80
Inventor 潘峰赵君梅安震涛刘会洲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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