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Preparation method of lithium saponification organic phase of acidic extractant

The technology of an acidic extractant and production method, which is applied in the direction of improving the process efficiency, can solve the problems of reducing the purity of lithium products, polluting the environment, polluting lithium products, etc., achieving short saponification process, high degree of greening, and expanding the scope of application Effect

Inactive Publication Date: 2015-03-11
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as the separation and purification of lithium with acidic extractant is concerned, the existing saponification methods mainly have the following deficiencies: ① the second step of saponification must be carried out, and the saponification process is long
② Saponification waste water containing salt must be produced, polluting the environment
③ Sodium, calcium and magnesium contaminate lithium products, seriously reducing the purity of lithium products
In conclusion, the absence of a suitable saponification method limits the practical application of acidic extractants in the preparation of high-purity and ultra-high-purity lithium products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Preparation of unloaded acidic extractant organic solution

[0021] Add 100 kg of extractant P507 and 100 kg of diluent kerosene in sequence in the container, stir thoroughly at room temperature for 15 min, and mix well to obtain 200 kg of unloaded P507 organic solution. The concentration of P507 in the organic phase solution was 1.5 M, and it was set aside.

[0022] (2) Preparation of aqueous solution of saponification agent

[0023] Add 2.6 kg of saponification agent lithium hydroxide and 47.4 kg of water successively into the container, stir at room temperature until completely dissolved, cool to a temperature of 25° C., and obtain 50 kg of lithium hydroxide saponification liquid for future use.

[0024] (3) Preparation of lithium saponification organic phase of acidic extractant

[0025] In the extractor, sequentially add 200 kg of unloaded P507 organic solution obtained in the first step and 50 kg of lithium hydroxide saponification liquid obtained in the sec...

Embodiment 2

[0028] (1) Preparation of unloaded acidic extractant organic solution

[0029] Add 100 kg of extractant P204 and 100 kg of diluent sulfonated kerosene in sequence in the container, stir thoroughly at room temperature for 20 min, mix well, and obtain 200 kg of unloaded P204 organic solution. The concentration of P204 in the organic phase solution was 1.5 M, and it was reserved.

[0030] (2) Preparation of saponification agent slurry

[0031] Add 3.0 kg of lithium carbonate and 47 kg of water successively into the container, stir well at room temperature until the mixture is uniform, the time is about 20 min, and 50 kg of lithium carbonate saponification slurry is obtained. spare.

[0032] (3) Preparation of lithium saponification organic phase of acidic extractant

[0033] In the extractor, add 200 kg of unloaded P204 organic solution obtained in the first step and 50 kg of lithium carbonate saponification slurry obtained in the second step in sequence, control the saponific...

Embodiment 3

[0036] (1) Preparation of unloaded acidic extractant organic solution

[0037] Add 67 kg of extractant P204 and 133 kg of diluent kerosene in sequence in the container, fully stir at room temperature for 20 min, and mix well to obtain 200 kg of unloaded P204 organic solution. The concentration of P204 in the organic phase solution was 1 M, and it was set aside.

[0038] (2) Preparation of aqueous solution of saponification agent

[0039] Add 0.48 kg of saponification agent lithium hydroxide and 49.52 kg of water successively into the container, stir at room temperature until completely dissolved, cool to a temperature of 20°C, and obtain 50 kg of lithium hydroxide saponification liquid, which is set aside.

[0040] (3) Preparation of lithium saponification organic phase of acidic extractant

[0041] In the extractor, sequentially add 200 kg of unloaded P204 organic solution obtained in the first step and 50 kg of lithium hydroxide saponification liquid obtained in the second...

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Abstract

The invention discloses a preparation method of a lithium saponification organic phase of an acidic extractant. The preparation method is characterized in that lithium hydroxide, lithium oxide or lithium carbonate is used as a saponifying agent, and a cascade extraction separation system directly entering purified lithium can be obtained through one-step saponification reaction. The preparation method is suitable for the lithium saponification of an acidic phosphorus extractant, a carboxylic acid extractant and an organic phenol extractant. The prepared lithium saponification organic phase is suitable for the preparation of high-purity and ultra-high purity lithium products through cascade extraction. The preparation method comprises the following three main steps: (1) preparing an unloaded acidic extractant organic solution; (2) preparing a saponifying agent aqueous solution or slurry; and (3) preparing the lithium saponification organic phase of the acidic extractant. The preparation method has the advantages of short saponification technological process, no emission of saponification effluent brine, high environmental protection degree, low saponification cost and the like.

Description

technical field [0001] The invention relates to a preparation method of an acidic extractant saponified organic phase, in particular to a preparation method of an acidic extractant lithium saponified organic phase. Background technique [0002] High-purity and ultra-high-purity lithium products are extremely important strategic substances, widely used in electronic materials, lithium battery electrode materials, magnetic materials, ceramic materials, glass materials, lithium alloy materials, lithium battery electrolytes, atomic energy, aerospace, defense industry , optical instruments, refrigeration industry and other fields. The use of acidic extractants to separate metal ion impurities in industrial-grade lithium feed solutions is the preferred method for preparing high-purity and ultra-high-purity lithium products. Because an acidic extractant is used, lithium is a difficult-to-extract component, and impurities such as other metal ions (such as iron, aluminum, calcium, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/26C22B3/38C22B3/32C22B26/12
CPCY02P10/20
Inventor 钟学明吴少林
Owner NANCHANG HANGKONG UNIVERSITY
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