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Method for quasi-fractionation extraction and separation of sodium and potassium in lithium sulfate

A lithium sulfate and quasi-fractionation technology, applied in the direction of improving process efficiency, can solve the problems of high operating environment requirements, low purity of lithium sulfate, poor separation effect, etc., and achieve the effects of good operating environment, low separation cost and easy operation.

Inactive Publication Date: 2018-10-26
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using traditional methods to separate alkali metal impurities in lithium sulfate has disadvantages such as high operating environment requirements, high labor intensity, poor separation effect, high production cost, low yield, and the purity of lithium sulfate is lower than 99.999%.
As of today, there are few reports on the preparation of lithium sulfate with a purity of 99.999% to 99.9999%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Lithium sulfate feed solution

[0021] Lithium sulfate feed liquid is adjusted to pH 13 by lithium hydroxide, wherein the concentration of lithium is 1.5M, the concentration of sodium is 0.006M, and the concentration of potassium is 0.003M.

[0022] 2) Organic phase

[0023] The organic phase is a sulfonated kerosene solution of t-BAMBP, the concentration of t-BAMBP is 0.9M, and the lithium saponification rate is 18%.

[0024] 3) Apparent washing liquid

[0025] The apparent washing solution is a lithium sulfate feed solution, and the pH value is adjusted to 13 by using lithium hydroxide, wherein the concentration of lithium is 1.5M, the concentration of sodium is 0.006M, and the concentration of potassium is 0.003M.

[0026] 4) Quasi-fractionation extraction system

[0027] The quasi-fractional extraction system consists of an extraction section and an extraction and washing section. The organic phase of lithium saponification enters the quasi-fractionation extr...

Embodiment 2

[0033] 1) Lithium sulfate feed solution

[0034] Lithium sulfate feed liquid is adjusted to pH 13 by lithium hydroxide, wherein the concentration of lithium is 1.5M, the concentration of sodium is 0.002M, and the concentration of potassium is 0.001M.

[0035] 2) Organic phase

[0036] The organic phase is a sulfonated kerosene solution of t-BAMBP, the concentration of t-BAMBP is 1.0M, and the lithium saponification rate is 17%.

[0037] 3) Apparent washing liquid

[0038] The apparent washing solution is a lithium sulfate feed solution, and the pH value is adjusted to 13 by using lithium hydroxide, wherein the concentration of lithium is 1.5M, the concentration of sodium is 0.012M, and the concentration of potassium is 0.006M.

[0039] 4) Quasi-fractionation extraction system

[0040] The quasi-fractional extraction system consists of an extraction section and an extraction and washing section. The lithium saponified organic phase enters the quasi-fractionation extraction ...

Embodiment 3

[0046] 1) Lithium sulfate feed solution

[0047] Lithium sulfate feed liquid is adjusted to a pH value of 13 by lithium hydroxide, wherein the concentration of lithium is 2.0M, the concentration of sodium is 0.012M, and the concentration of potassium is 0.006M.

[0048] 2) Organic phase

[0049] The organic phase is a sulfonated kerosene solution of t-BAMBP, the concentration of t-BAMBP is 1.0M, and the lithium saponification rate is 20%.

[0050] 3) Apparent washing liquid

[0051] The apparent washing liquid is a lithium sulfate feed liquid, and the pH value is adjusted to 13 by using lithium hydroxide, wherein the concentration of lithium is 2.0M, the concentration of sodium is 0.012M, and the concentration of potassium is 0.006M.

[0052] 4) Quasi-fractionation extraction system

[0053] The quasi-fractional extraction system consists of an extraction section and an extraction and washing section. The lithium saponified organic phase enters the quasi-fractionation extr...

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PUM

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Abstract

The invention discloses a method for extracting and separating sodium and potassium in lithium sulfate by quasi-fractionation, belonging to the technical field of solvent extraction. The 2N grade lithium sulfate solution after the alkaline earth metal impurities have been separated and removed is used as the feed liquid, t-BAMBP is used as the extractant, sulfonated kerosene is used as the diluent, lithium saponification t-BAMBP is used as the extraction organic phase, and the lithium sulfate feed solution is used for apparent washing Reagent, quasi-fractional extraction method to separate alkali metal impurities sodium and potassium in lithium sulfate. The lithium saponification organic phase enters the quasi-fractionation extraction system from the first stage, the lithium sulfate feed liquid enters the quasi-fractionation extraction system from the junction of the extraction section and the extraction section, and the apparent washing liquid enters from the last stage. Obtain the target product lithium sulfate solution from the first-stage outlet water phase, wherein the concentration of lithium is 1.0M~2.0M, the concentration of sodium is 2.5×10-7M~2.6×10-6M, and the concentration of potassium is 1.1×10-6M 8M~1.0×10‑7M. Concentrate and crystallize the obtained lithium sulfate solution to obtain hydrated lithium sulfate with a purity of 5N-6N. Compared with raw materials, the removal rate of sodium in the separated product is 99.978%-99.9969%, and the removal rate of potassium is 99.9983%-99.99957%.

Description

technical field [0001] The present invention relates to the method for quasi-fractionation extraction and separation of sodium and potassium in lithium sulfate, in particular to a lithium saponification t-BAMBP as the extraction organic phase, lithium sulfate stock solution as apparent detergent, quasi-fractionation extraction method for separating lithium sulfate solution The invention discloses a process method for sodium and potassium as impurities, belonging to the technical field of solvent extraction. Background technique [0002] Lithium functional materials are widely used in high-tech fields such as atomic energy, aerospace, defense industry, and optical instruments. Lithium sulfate with a purity higher than 99.99% is an important raw material for preparing high-performance lithium functional materials, so it is of great practical significance to research and develop a process for preparing lithium sulfate with a purity higher than 99.99%. [0003] The main alkali ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/26C22B26/12
CPCC22B26/12C22B3/262Y02P10/20
Inventor 钟学明
Owner NANCHANG HANGKONG UNIVERSITY
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