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A method of producing battery-grade lithium hydroxide monohydrate from battery-grade lithium carbonate

A technology of lithium hydroxide and lithium carbonate, which is applied in the direction of lithium oxide; The effect of guaranteeing product quality, ensuring quality, and reducing processing steps

Active Publication Date: 2019-02-01
JIANGXI HZONE LITHIUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the technical deficiencies of the prior art, such as large energy consumption, serious environmental pollution, accumulation of amphoteric hydroxides in the product, high calcium impurity content in the product and difficulty in completely removing it, and the present invention provides a battery-grade monohydric A method for lithium hydroxide, particularly a method for producing battery-grade lithium hydroxide monohydrate from battery-grade lithium carbonate, which uses battery-grade lithium carbonate as a raw material, adopts a calcium cycle method, and is combined with battery-grade lithium carbonate production, hydroxide After the lithium crystallization mother liquor is neutralized by acid, precipitated and separated to remove the amphoteric hydroxide, it is returned to the battery-grade lithium carbonate production system to produce battery-grade lithium hydroxide monohydrate through intermediate steps, eliminating the main impurities such as sodium, potassium, zinc, tin and aluminum, etc. The accumulation of the system has improved the product quality, avoided the introduction of a large amount of impurities in the industrial lime into the system, greatly reduced the treatment steps of the lithium hydroxide solution, and reduced the cost

Method used

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  • A method of producing battery-grade lithium hydroxide monohydrate from battery-grade lithium carbonate

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Embodiment 1

[0024] Embodiment 1 A method of producing battery-grade lithium hydroxide monohydrate from battery-grade lithium carbonate

[0025] 1) Transformation reaction: add calcium oxide and water to lithium carbonate at a weight ratio of 1:0.7:18, and a transformation reaction occurs at 80°C for 7 hours to generate transformation slag and lithium hydroxide solution. The conversion rate is 91.1%. The concentration is 3.49%.

[0026] 2) Separation and washing: separating the reacted conversion slag from the lithium hydroxide solution, washing the conversion slag, and incorporating the washing solution into the lithium hydroxide solution.

[0027] 3) drying the conversion slag obtained in step 2), and the generated calcium oxide enters the calcium cycle to participate in the conversion reaction of step 1) again;

[0028] 4) Evaporate, crystallize and dry the lithium hydroxide solution obtained in step 2) to obtain lithium hydroxide monohydrate; the condensed water generated during the c...

Embodiment 2

[0030] Embodiment 2 A method of producing battery-grade lithium hydroxide monohydrate from battery-grade lithium carbonate

[0031] 1) Conversion reaction: add calcium oxide and water to lithium carbonate at a weight ratio of 1:0.75:18.7, and a conversion reaction occurs at 85°C for 5.5 hours to generate conversion slag and lithium hydroxide solution. The conversion rate is 98.5%. Lithium hydroxide The concentration is 3.45%.

[0032] 2) Separation and washing: separating the reacted conversion slag from the lithium hydroxide solution, washing the conversion slag, and incorporating the washing solution into the lithium hydroxide solution.

[0033] 3) drying the conversion slag obtained in step 2), and the generated calcium oxide enters the calcium cycle to participate in the conversion reaction of step 1) again;

[0034] 4) Evaporate, crystallize and dry the lithium hydroxide solution obtained in step 2) to obtain lithium hydroxide monohydrate; the condensed water generated d...

Embodiment 3

[0036] Embodiment 3 A method of producing battery-grade lithium hydroxide monohydrate from battery-grade lithium carbonate

[0037] 1) Conversion reaction: add calcium oxide and water to lithium carbonate at a weight ratio of 1:0.72:20, and a conversion reaction occurs at 80°C for 6.5 hours to generate conversion slag and lithium hydroxide solution. The conversion rate is 93.3%. The concentration of lithium is 3.43%.

[0038] 2) Separation and washing: separating the reacted conversion slag from the lithium hydroxide solution, washing the conversion slag, and incorporating the washing solution into the lithium hydroxide solution.

[0039] 3) drying the conversion slag obtained in step 2), and the generated calcium oxide enters the calcium cycle to participate in the conversion reaction of step 1) again;

[0040] 4) Evaporate, crystallize and dry the lithium hydroxide solution obtained in step 2) to obtain lithium hydroxide monohydrate; the condensed water generated during the...

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Abstract

The invention provides a method for producing battery-grade lithium hydroxide monohydrate from battery-grade lithium carbonate, and belongs to the field of battery-grade lithium hydroxide monohydrate preparation. The method comprises the steps of carrying out conversion reaction on excessive lithium carbonate, water and calcium oxide, separating obtained conversion slag from a lithium hydroxide solution, combining a conversion slag washing liquid into the lithium hydroxide solution, drying the obtained conversion slag and entering generated calcium oxide and unreacted lithium carbonate into a calcium cycle for participating into conversion reaction again; evaporating and crystallizing the obtained lithium hydroxide solution, drying to obtain the lithium hydroxide monohydrate. The battery-grade lithium hydroxide monohydrate is produced from the battery-grade lithium carbonate as the raw material by adopting a calcium cycle method, so that accumulation of main impurities of sodium, potassium, zinc, tin and aluminum in a system is removed, the quality of a product is improved, a lot of impurities in industrial lime are prevented from being introduced into the system, the cost is reduced and the method has a good application prospect.

Description

technical field [0001] The invention relates to a method for producing battery-grade lithium hydroxide monohydrate, in particular to a method for producing battery-grade lithium hydroxide monohydrate from battery-grade lithium carbonate Background technique [0002] Mineral phase reconstruction technology is a new technology for mineral processing. Mineral phase reconstruction is to restructure the mineral structure containing valuable components by processing the original minerals, so that the valuable components can be extracted and separated from each other, so as to effectively separate the valuable components. Such as: 1) Yan Qunxuan, Li Xinhai, etc., a new method for processing lepidolite ore [P], 201210080657.4; 2) Hu Qiyang, Li Xinhai, etc., a method for comprehensive utilization of lepidolite ore phase reconstruction and extraction of lithium slag [P], 201310625983.3; 3) Hu Qiyang, Li Xinhai, etc., an improved solid-reconstructed lepidolite extraction method for al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/02
CPCC01D15/02
Inventor 胡简郭永兴王迎春曾小毛刘金练樊磊欧阳红勇祝宏帅
Owner JIANGXI HZONE LITHIUM TECH
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