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Method for industrially producing industrial, cell-grade or high-purity lithium hydroxide monohydrate

A technology of monohydrate lithium hydroxide and lithium hydroxide, applied in the direction of lithium oxide;/hydroxide, etc., can solve the problem of low industrial production of lithium hydroxide, low lithium hydroxide yield, and inability to meet market demand, etc. problems, to achieve good industrial application prospects, reduce production costs, and easy to operate.

Inactive Publication Date: 2012-12-19
四川长和华锂科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing industrial production method of lithium hydroxide has low yield, low heat utilization rate, high energy consumption, a large amount of waste liquid discharge, and low environmental friendliness; at the same time, due to the limitation of current production equipment, the industrialization of lithium hydroxide The production volume is low and cannot meet the current market demand for lithium hydroxide monohydrate

Method used

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  • Method for industrially producing industrial, cell-grade or high-purity lithium hydroxide monohydrate
  • Method for industrially producing industrial, cell-grade or high-purity lithium hydroxide monohydrate
  • Method for industrially producing industrial, cell-grade or high-purity lithium hydroxide monohydrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Embodiment 1 The present invention prepares the method for battery-grade lithium hydroxide

[0059] according to figure 1 Shown technological process, prepares high-purity lithium carbonate:

[0060] (1), Grinding

[0061] ① Take the salt lake type lithium mine, which is the Zabuye salt lake lithium mine (Li 2 O: 5.0~40.3%)

[0062] ②coarse crushing: crush the material directly, the particle size is less than 50mm

[0063] ③Drying The drying temperature is controlled within 350°C, and the moisture content of the material is less than 3%.

[0064] ④Fine Grinding Use ultra-fine powder grinding material particle size <50μm

[0065] (2) Impurity removal by thermal precipitation

[0066] ⑤Separation of lithium and sodium once. Heat the material ④ or the sodium-containing liquid ⑩ in a reaction kettle with a solid-to-liquid mass volume ratio of 1:2 to 90°C for hot agitation. After keeping the temperature for 20-30 minutes, separate and dry it with a centrifuge to obtain...

Embodiment 2

[0114] The preparation of embodiment 2 high-purity lithium carbonate

[0115] LiOH prepared in Example 1 was dissolved in pure water for three wet fine works, and the solution Li 2 O: 60~90g / L

[0116] Add EDTA to further remove Ca 2+ , Fe 3+ , Mg 2+ 、Si 4+ , B 3+ and other impurities, and filter

[0117] The filtrate was clear and transparent, Li 2 O: 60~90g / L

[0118] Introduce high-purity CO 2 In the sealed carbonization tower, CO control 2 flow rate

[0119] Control the pressure at 0.01~0.1MPa

[0120] Centrifugal separation High purity Li 2 CO 3 Moisture content of wet crude product <8%

[0121] Will Li 2 CO 3 Add pure water to the wet crude product, stir and wash at a constant temperature of 90-120°C for 10-30 minutes at a solid-to-liquid ratio of 1:2-5

[0122] centrifugal separation

[0123] Moisture content of high-purity lithium carbonate wet product <8%

[0124] Dry at 200-500°C, moisture <0.05%

[0125] High-purity lithium ca...

Embodiment 3

[0126] Embodiment 3 The present invention prepares the method for industrial grade lithium hydroxide

[0127] according to figure 2 Shown technological process, prepares high-purity lithium carbonate:

[0128] (1), Grinding

[0129] ① Take carbonate type lithium concentrate (Li 2 O: 5.0~40.3%, such as Zabuye Salt Lake lithium mine);

[0130] ②Coarse crushing: crush the lithium concentrate to a particle size of ≤5mm;

[0131] ③Drying: Drying temperature ≤ 350 ℃, drying to material moisture ≤ 3%;

[0132] ④ Fine grinding: use ultra-fine powder to grind until the particle size of the material is ≤ 80 μm.

[0133] (2) Impurity removal by thermal precipitation

[0134] ⑤Lithium-sodium separation, the material ④ or the sodium-containing liquid ⑩ is separated and dried by solid-liquid mass, and the lithium-containing solid and the sodium-containing liquid are obtained; the volume ratio is 1:2, heated to 90°C in the reaction kettle, and the temperature is 20~ centrifuge after ...

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Abstract

The invention provides a method for industrially producing an industrial, cell-grade or high-purity lithium hydroxide monohydrate, which comprises the following steps of: (1) grinding; (2) removing impurities by a thermal precipitation method; (3) causticizing; and (4) removing impurities, crystallizing, washing, separating and drying. The invention also provides a method for preparing high-purity lithium carbonate. After causticizing reaction equipment and a reaction method which are provided by the invention are utilized, the feeding amount of the single causticizing production can be greatly improved and the large-scale industrial continuous production of the industrial and cell-grade lithium hydroxide monohydrate and the high-purity lithium carbonate is implemented; the consumption of water resources and energy can be effectively reduced and in the reaction, only a cheap precipitating agent or a cheap complexing agent needs to be used, so that the production cost is reduced; and the reaction is simple and convenient to operate and, the environment pollution is small, the obtained product has high quality and yield, the quality of the obtained product is stable and the product has wide industrial application prospect.

Description

technical field [0001] The invention relates to a method for industrially producing industrial-grade, battery-grade or high-purity lithium hydroxide monohydrate by using lithium ore. Background technique [0002] Lithium is currently known as the lightest silver-white alkali metal with the smallest nucleus radius. Because lithium and its compounds have many unique and excellent properties, they are widely used in glass, ceramics, lubrication, electronics, metallurgy, medicine, refrigeration, aerospace and other fields. With the rising demand for clean energy, lithium energy may have a profound impact on human life, and it is also known as "the energy upstart of the 21st century". Lithium hydroxide monohydrate is one of the most important lithium salts. It is widely used in chemical raw materials, chemical reagents, lithium-ion batteries, petroleum, metallurgy, glass, ceramics and other industries, and is also a traditional Chinese medicine raw material in the defense indus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02
Inventor 苏康杜洪文向东
Owner 四川长和华锂科技有限公司
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