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Purification production technique for producing high pure and high clear lithium hydroxide from lithium hydroxide in industrial grade

A technology of lithium hydroxide and production technology, applied in the direction of lithium oxide;/hydroxide, etc., can solve the problem that high-purity high-definition lithium hydroxide cannot be produced industrially, and achieve high product yield, simplified process and shortened operation. Convenient and simple effect

Inactive Publication Date: 2005-10-26
广州锐鑫锂能新材料科技有限公司
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Problems solved by technology

However, due to historical and institutional reasons, the industrial production of high-purity and high-definition lithium hydroxide has not yet been realized, and it mainly relies on imports

Method used

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  • Purification production technique for producing high pure and high clear lithium hydroxide from lithium hydroxide in industrial grade

Examples

Experimental program
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Effect test

Embodiment 1

[0025] see as figure 1 As shown in, the purification production technology of producing high-purity and high-definition lithium hydroxide from industrial-grade lithium hydroxide of the present invention, the raw materials are produced by Xinjiang Lithium Salt Factory, and the industrial grade 1 quality standard. Its main quality indicators are: LiOH·H 2 O main content: ≥56.5 (molecular crystallization water is counted), the content of each impurity element is as follows: CO 2 : 0.5%, K + : 0.15%, Na + : 0.05%, CaO: 0.035%, Fe 2+ : 0.003%, Cl - : 0.004%, SO 4 2- : 0.03%, hydrochloric acid insoluble matter: 0.01%, water insoluble matter: 0.02%. The impurity content of silicon (Si) in the raw material is mainly expressed in the form of hydrochloric acid insoluble matter and water insoluble matter, the sum of which is 0.03%, ie 300ppm. Feed about 170kg of industrial-grade lithium hydroxide, add about 650kg of conductive water, introduce it into the dissolution tank A, stir...

Embodiment 2

[0027] Use the same raw materials as in Example 1, feed about 170kg of industrial grade lithium hydroxide, add about 650kg of conductive water, introduce it into the dissolution tank A, stir at room temperature 30°C for 10 minutes to fully dissolve, and remove surface impurities after standing for 10 minutes , and then quickly filtered to remove about 0.1 to 0.2% of the total weight of insoluble sediment to obtain silicon removal solution 1, inject silicon removal solution 1 into reactor B and start heating, when the temperature reaches 50°C, add 7% carbonation Reagents were purified and subjected to partial carbonation co-precipitation reactions. Ammonia and hydrogen are released during the reaction, which should be discharged and recovered in time with ventilation equipment. Continue heating to boiling (about 100-105°C), and keep boiling for 1 hour, so that all kinds of reactions can be carried out completely. Filtrate while hot within 20 minutes after stopping heating, carr...

Embodiment 3

[0029] Use the same raw materials as in Example 1, feed about 170kg of industrial grade lithium hydroxide, add about 650kg of conductive water, introduce it into the dissolution tank A, stir at room temperature 25°C for 15 minutes to fully dissolve, and remove surface impurities after standing for 8 minutes , and then quickly filtered to remove about 0.1 to 0.2% of the total weight of insoluble sediment to obtain silicon removal solution 1, inject silicon removal solution 1 into reactor B and start heating, when the temperature reaches 45°C, add 4% carbonation Reagents were purified and subjected to partial carbonation co-precipitation reactions. Ammonia and hydrogen are released during the reaction, which should be discharged and recovered in time with ventilation equipment, continue to heat to boiling (about 100-105°C), and keep boiling for 50 minutes to complete the various reactions. Filtrate while hot within 15 minutes after stopping the heating, and separate the liquid a...

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Abstract

The present invention discloses a purification production technique for producing high-purity high-cleaness lithium hydroxide by utilizing industrial-level lithium hydroxide. It includes the following steps: (1) fully dissolving industrial-level raw material lithium hydroxide at 20-30 deg.C and quickly filtering to obtain silica-removed liquor; (2). heating silica-removed liquor to 40-50 deg.C in reactor, adding carbonating purification reagent, heating, boiling, precipitating, filtering to obtain purified liquor; (3). heating the purified liquor, concentrating, crystallizing, solid-liquid separating to obtain lithium hydroxide crystal; and (4). purifying the obtained lithium hydroxide crystal, drying and dewatering so as to obtain the high-purity high-cleaness lithium hydroxide.

Description

technical field [0001] The invention relates to a purification technology of lithium hydroxide, in particular to a purification production technology for producing high-purity and high-definition lithium hydroxide from industrial-grade lithium hydroxide used for producing high-tech lithium products. Background technique [0002] High-purity high-definition lithium hydroxide is one of the most important basic raw materials for the production of high-tech lithium products. Its high-purity concept is: main content (LiOH·H 2 O) reaches more than 99.9% (including molecular crystal water), or the impurity content of each element and compound is less than 30ppm, and the key impurity element (such as Si) is less than 15ppm; the concept of high definition (that is, transmittance or clarity) reaches 95 % above, up to 99.5%. At present, it is mainly used for the production of single crystal chips (such as high-purity high-definition lithium tetraborate single crystal, high-purity high...

Claims

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Application Information

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IPC IPC(8): C01D15/02
Inventor 卢胜安卢征路二莲孔原房档存
Owner 广州锐鑫锂能新材料科技有限公司
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