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Lithium precipitation mother liquor treatment method and device

A lithium sinking mother liquor and solution technology, applied in lithium halide, lithium sulfate/sulfite, lithium carbonate;/acid carbonate, etc., can solve high cost, low phosphorus utilization economy, Lithium purity is low and other problems, to achieve high recovery, reduce the amount of use, improve the effect of purity

Active Publication Date: 2020-06-12
ЦИНХАЙ СОЛТ ЛЕЙК ИНДАСТРИ ГРУП КО ЛТД +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Patent CN104925837A discloses a method for recovering lithium-precipitating mother liquor. This method uses relatively expensive phosphoric acid and sodium hydroxide as raw materials, and the cost is high. The lithium phosphate produced in the process of recovering lithium in the mother liquor has a low purity. As a transition product, it needs to be converted into other substances to recover and use lithium, and the higher-value phosphorus enters the low-value calcium phosphate, and the utilization of phosphorus is not economical.

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  • Lithium precipitation mother liquor treatment method and device
  • Lithium precipitation mother liquor treatment method and device
  • Lithium precipitation mother liquor treatment method and device

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Experimental program
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Effect test

Embodiment 1

[0055] Step 1, taking the lithium sinking mother liquor after the reaction of preparing lithium carbonate, and evaporating and separating under reduced pressure to obtain the first mixed solution and lithium carbonate;

[0056] Step 2, adding hydrochloric acid to the first mixed solution to adjust the pH to 6-7 to obtain the second mixed solution;

[0057] Step 3, the second mixed solution contains lithium ions with a mass concentration of 1.9 g / l and sodium ions with a mass concentration of 75.9 g / l. After 85°C, -0.8Bar vacuum evaporation and concentration, the obtained water vapor is recycled after cooling, and the obtained suspension is the third mixed liquid. Wherein, the mass of solid sodium chloride in the third mixed solution accounts for 85.5%, and the mass of lithium-sodium mixed solution accounts for 14.5%;

[0058] Step 4, freeze and crystallize the third mixed solution at -5°C, reduce the sodium content in the third mixed solution by 3 times, and obtain the fourth...

Embodiment 2

[0061] Step 1, taking the lithium sinking mother liquor after the reaction of preparing lithium carbonate, and evaporating and separating under reduced pressure to obtain the first mixed solution and lithium carbonate;

[0062] Step 2, adding hydrochloric acid to the first mixed solution to adjust the pH to 6-7 to obtain the second mixed solution;

[0063] Step 3, the second mixed solution contains lithium ions with a mass concentration of 1.3 g / l and sodium ions with a mass concentration of 93.4 g / l. After 85°C, -0.7Bar vacuum evaporation and concentration, the obtained water vapor is recycled after cooling, and the obtained suspension is the third mixed liquid. Among them, the mass of solid sodium chloride in the third mixed solution accounts for 89.29%, and the mass of lithium-sodium mixed solution accounts for 10.71%;

[0064] Step 4, freezing and crystallizing the third mixed solution at -5°C, the mass ratio of the sodium content in the third mixed solution is reduced by...

Embodiment 3

[0067] Step 1, taking the lithium sinking mother liquor after the reaction of preparing lithium carbonate, and evaporating and separating under reduced pressure to obtain the first mixed solution and lithium carbonate;

[0068] Step 2, adding hydrochloric acid to the first mixed solution to adjust the pH to 6-7 to obtain the second mixed solution;

[0069] Step 3, the second mixed solution contains lithium ions with a mass concentration of 1.9 g / l and sodium ions with a mass concentration of 75.9 g / l. After 85°C, -0.7Bar vacuum evaporation and concentration, the obtained water vapor is recycled after cooling, and the obtained suspension is the third mixed liquid. Among them, the mass of solid sodium chloride in the third mixed solution accounts for 82.3%, and the mass of lithium-sodium mixed solution accounts for 17.7%;

[0070] Step 4, freezing and crystallizing the third mixed solution at 0°C, the mass ratio of the sodium content in the third mixed solution is reduced by 2....

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Abstract

The method for treating the lithium precipitation mother liquor comprises the following steps: S1, carrying out reduced pressure evaporation and solid-liquid separation on the lithium precipitation mother liquor to obtain a lithium carbonate wet material and a first mixed solution; S2, adding hydrochloric acid into the first mixed solution for acidification to obtain a second mixed solution; S3,evaporating the second mixed solution under reduced pressure to obtain a third mixed solution; S4, freezing and crystallizing the third mixed solution to obtain a fourth mixed solution; and S5, carrying out centrifugal separation on the fourth mixed solution to obtain a sodium chloride crystal and a lithium chloride solution. According to the method, the lithium carbonate in the lithium precipitation mother liquor is partially separated and then acidified, so that the consumption of inorganic acid is reduced, the yield of the lithium carbonate is increased, and the sodium and lithium separation efficiency and the purity of the sodium salt are improved by combining reduced-pressure evaporation and freezing crystallization. The lithium is recycled by stages in two forms, so that the recoveryrate of the lithium is high.

Description

technical field [0001] The present invention generally relates to the field of recycling and utilization of lithium-precipitating mother liquor, and more specifically, relates to a method and device for treating lithium-precipitating mother liquor. Background technique [0002] Qinghai Salt Lake has a large amount of lithium resources. The salt lake brine is used to extract lithium, and after a series of impurity removal treatments, a higher concentration of lithium chloride mixed solution can be obtained, which is then reacted with sodium carbonate to precipitate lithium to prepare lithium carbonate products. The lithium precipitation mother liquor after the reaction usually contains lithium ions and a large amount of sodium ions and carbonate ions. Direct discharge will bring environmental pollution and waste of resources. The key to recovery is to effectively separate sodium ions, lithium ions and carbonate ions. In order to recover the active ingredients in the lithium s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08C01D15/04C01D3/06C01D15/06
CPCC01D15/08C01D15/04C01D3/06C01D15/06C01P2006/80
Inventor 何永平张荣子邢红杨建育马汉晓张占伟张成勇张成胜陈彩霞刘发贵景海德马成功宋生忠范莹莹田森
Owner ЦИНХАЙ СОЛТ ЛЕЙК ИНДАСТРИ ГРУП КО ЛТД