Method for preparing lithium carbonate by purifying lithium-containing solution through adsorption-pressurized desorption method

A technology of lithium solution and lithium carbonate, which is applied in the field of lithium extraction and resource utilization, can solve the problem of few kinds of adsorbents, etc., and achieve the effects of simple process, cost reduction and increased cycle times

Active Publication Date: 2022-05-27
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

This method improves the chitosan adsorbent by cross-linking, improves its adsorption performance and recognition performance, and improves the disadvantages of chitosan being easy to dissolve, soften and lose in acidic media to a certain extent, but this modification method is suitable for There are few kinds of adsorbents, usually only suitable for the modification of some organic adsorbents

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  • Method for preparing lithium carbonate by purifying lithium-containing solution through adsorption-pressurized desorption method

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Embodiment 1

[0065] The present embodiment provides a method for purifying a lithium-containing solution to prepare lithium carbonate by an adsorption-pressurized desorption method. The process flow diagram of the method is as follows: figure 1 shown, including the following steps:

[0066] (1) the lithium-containing solution is adsorbed by a lithium adsorbent, the lithium-containing solution is a salt lake brine with a lithium element content of 1 g / L, the lithium adsorbent is a manganese-based ion sieve, and the temperature of the adsorption is 80 ° C, The flow rate of the lithium-containing solution is 30BV / h, and the saturated lithium adsorbent is obtained after the adsorption is saturated; the saturated lithium adsorbent is washed with water, the temperature of the water washing is 30°C, the flow rate is 25BV / h, and the amount of water is 3BV, to obtain a lean Lithium solution;

[0067] (2) desorbing the saturated lithium adsorbent obtained in step (1) by using a composite desorber, ...

Embodiment 2

[0072] The present embodiment provides a method for preparing lithium carbonate by purifying a lithium-containing solution by an adsorption-pressurized desorption method, and the method includes the following steps:

[0073] (1) The lithium-containing solution is adsorbed by a lithium adsorbent, the lithium-containing solution is raffinate wastewater with a lithium element content of 0.8 g / L, the lithium adsorbent is a lithium adsorption resin, and the adsorption temperature is 20 ° C , the flow rate of the lithium-containing solution is 2.5BV / h, and the saturated lithium sorbent is obtained after the adsorption is saturated; the saturated lithium sorbent is washed with water, the temperature of the water washing is 20 ° C, the flow rate is 5BV / h, and the amount of water is 1BV, to obtain a lithium-poor solution;

[0074] (2) desorbing the saturated lithium adsorbent obtained in step (1) by using a composite desorbent, wherein the composite desorber is SO 2 and the gas-liquid...

Embodiment 3

[0079] The present embodiment provides a method for preparing lithium carbonate by purifying a lithium-containing solution by an adsorption-pressurized desorption method, and the method includes the following steps:

[0080] (1) Lithium-containing solution is adsorbed by a lithium adsorbent, the lithium-containing solution is a precipitation lithium mother liquor with a lithium element content of 0.75g / L, and the lithium adsorbent is a manganese-based ion sieve, and the temperature of the adsorption is 40 ℃ ℃, the flow rate of the lithium-containing solution is 10BV / h, and the saturated lithium sorbent is obtained after the adsorption is saturated; the saturated lithium sorbent is washed with water, the temperature of the water washing is 40℃, the flow rate is 10BV / h, and the amount of water is 2BV, to obtain a lithium-poor solution;

[0081] (2) desorbing the saturated lithium adsorbent obtained in step (1) by using a composite desorbent, wherein the composite desorber is CO ...

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Abstract

The invention provides a method for preparing lithium carbonate by purifying a lithium-containing solution through an adsorption-pressurized desorption method, and the method comprises the following steps: adsorbing the lithium-containing solution by adopting a lithium adsorbent, and obtaining a saturated lithium adsorbent after adsorption saturation; the saturated lithium adsorbent is subjected to pressurized desorption through a composite desorption agent, the composite desorption agent comprises a gas-liquid mixture of acid gas and an alkali metal bicarbonate solution, and a lithium-rich desorption solution is obtained; and carrying out gas-liquid separation on the lithium-rich desorption liquid, heating and decomposing the obtained liquid phase, and crystallizing to obtain a lithium carbonate product. According to the method, pressurized desorption of the saturated lithium adsorbent is achieved through the composite desorption agent, the composite desorption agent forms a weak acid or acid-free environment, and efficient desorption of lithium ions is achieved; the composite desorption agent adopted by the method can greatly reduce the dissolution loss of the lithium adsorbent, improve the cycle use frequency of the lithium adsorbent and reduce the cost; the process of preparing lithium carbonate from the desorption liquid does not involve acid-base neutralization, no acid-base waste liquid is discharged, and the process is simple.

Description

technical field [0001] The invention belongs to the technical field of lithium extraction and resource utilization, and relates to a method for preparing lithium carbonate by purifying a lithium-containing solution by an adsorption-pressure desorption method. Background technique [0002] As an important strategic metal, lithium has broad application prospects in energy and materials. In recent years, with the rapid development of the new energy industry, the technical demand for lithium resource development has surged. At present, lithium resources mainly exist in salt lake brine, pegmatite-type lithium ore and new carbonate clay-type lithium ore. Among them, salt lake brine Lithium resources account for the highest proportion in the middle, but the lithium concentration in salt lake brine is wide and the ratio of lithium to magnesium is high, which makes the separation and extraction of lithium more difficult. In addition to the above-mentioned resources such as lithium-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
CPCC01D15/08Y02P10/20
Inventor 李少鹏武文粉李会泉侯新娟李占兵张建波
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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