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Method for preparing high-purity lithium hydroxide

A lithium hydroxide and purity technology, applied in the field of high-purity lithium, can solve the problems of high energy consumption, high cost, and difficulty in removing impurities, and achieve high material utilization, less impurity components, and environmentally friendly processes

Active Publication Date: 2019-06-07
MEISHAN SHUNYING POWER BATTERY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for preparing lithium hydroxide in order to overcome the shortcomings of high energy consumption, high cost and difficulty in removing impurities in the preparation process of high-purity lithium hydroxide products in the prior art

Method used

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  • Method for preparing high-purity lithium hydroxide

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Effect test

Embodiment 1

[0053] Preparation of high-purity lithium hydroxide from industrial grade lithium carbonate

[0054] Industrial grade lithium carbonate composition: Li 2 CO 3 98.1%, Na 2 O 0.26%, CaO 0.21%, SO 4 2— 0.62%, Fe 2 o 3 0.32%, MgO 0.26%, salt and inclusions 0.031%.

[0055] (1) Dilute industrial grade lithium carbonate with sulfuric acid H 2 SO 4 Leaching, add pure water and sulfuric acid during the leaching process, so that lithium sulfate Li in the leaching solution 2 SO 4 The content is 90g / L, the pH of the leaching solution is 2.8, and the Ca 129mg / L, Mg 138mg / L, and Fe 159mg / L in the leaching solution.

[0056] (2) Add lithium hydroxide LiOH liquid to adjust the pH to about 7.0, and add lithium carbonate Li at 60~70°C 2 CO 3 Powder, the amount of lithium carbonate added is 1.1 times the amount required for the theoretical removal of calcium, magnesium and iron. Add sulfuric acid or lithium hydroxide to control the pH at about 7.0, and react for 20 minutes. F...

Embodiment 2

[0062] Preparation of high-purity lithium hydroxide from industrial grade lithium carbonate

[0063] Industrial grade lithium carbonate composition: Li 2 CO 3 98.21%, Na 2 O 0.31%, CaO 0.32%, SO 4 2— 0.58%, Fe 2 o 3 0.41%, MgO 0.29%, salt and inclusions 0.035%.

[0064] (1) Add industrial grade lithium carbonate to sulfuric acid H 2 SO 4 Carry out leaching, add pure water and sulfuric acid H during the leaching process 2 SO 4 , so that lithium sulfate Li in the leaching solution 2 SO 4 The content is 110g / L, the pH of the leaching solution is 3.2, and the Ca139mg / L, Mg126mg / L, and Fe167mg / L in the leaching solution.

[0065] (2) Add lithium hydroxide LiOH liquid to adjust pH=7.2, and add lithium carbonate Li at 60~70°C 2 CO 3 Powder, the amount of lithium carbonate added is 1.05 times the amount required to remove calcium, magnesium, and iron in theory, adding sulfuric acid or lithium hydroxide to control pH = 7.3, reacting for 20 minutes, filtering through a...

Embodiment 3

[0075] Preparation of high-purity lithium hydroxide from industrial grade lithium carbonate

[0076] Industrial grade lithium carbonate composition: Li 2 CO 3 98.22%, Na 2 O 0.22%, CaO 0.38%, SO 4 2— 0.42%, Fe 2 o 3 0.46%, MgO 0.39%, salt and inclusions 0.027%.

[0077] (1) Add pure water and sulfuric acid during the leaching process, so that the lithium sulfate content in the leaching solution is 125g / L, the ph of the leaching solution is 3.4, and the Ca 119mg / L, Mg 127mg / L, and Fe 135mg / L in the leaching solution.

[0078] (2) Add lithium hydroxide liquid to adjust pH = about 7.0, add lithium carbonate powder at 60~70°C, the amount of lithium carbonate added is 1.1 times the amount required to remove calcium, magnesium, and iron theoretically, add sulfuric acid or hydroxide Lithium controls the pH=7.0, reacts for 20 minutes, and filters through a plate and frame filter press. The impurity content in the filtrate is calcium 14mg / L, magnesium 10.6mg / L, Fe9.4mg / L, an...

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Abstract

The invention discloses a method for preparing lithium hydroxide, which comprises the following steps: S1, dissolving raw lithium carbonate with sulfuric acid to obtain lithium sulfate solution; S2, using lithium hydroxide to regulate that pH of the solution to be 6.6-8.5; adding lithium carbonate to precipitate and filtering to obtain a first filtrate; S3, filtering by adopting a membrane filterdevice to obtain a second filtrate; S4, adopting resin adsorption to obtain resin adsorbed liquid; S5, adding water to dilute, and passing through a bipolar membrane to obtain dilute brine, acid waterand alkali water; the alkali water being a lithium hydroxide solution; S6, after evaporating and concentrating alkali water and crystallizing, obtaining the crystal being lithium hydroxide monohydrate, and the purity being more than 99wt%. A material liquid with extremely low impurity content is obtained by acid-base reaction precipitation impurity and multi-stage filtration treatment, membrane filtration and resin adsorption treatment using crude lithium carbonate as raw material, alkali water is obtained by bipolar membrane separation, and high-quality and high-purity lithium hydroxide is obtained by evaporation and concentration crystallization.

Description

technical field [0001] The invention relates to a preparation technology of high-purity lithium hydroxide, mainly relates to the preparation of high-purity lithium hydroxide by using a bipolar membrane after impurity removal and filtration of lithium carbonate, and belongs to the high-purity lithium technical field upstream of new energy lithium batteries. Background technique [0002] Lithium is the metal with the smallest density in nature, it has strong chemical activity, it is in the first main group of the periodic table of elements, and it is the first metal element. Lithium is currently the most widely used metal element. As a basic raw material, it plays an important role in modern industry and is an energy metal that various industries are competing to use. Among them, lithium hydroxide and lithium carbonate are the two forms most used in industry. Lithium hydroxide is mainly used in chemical raw materials, battery industry, chemicals and other industries, and of c...

Claims

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Application Information

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IPC IPC(8): C01D15/02
Inventor 但勇赵澎刘伟
Owner MEISHAN SHUNYING POWER BATTERY MATERIALS CO LTD
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