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Method for producing lithium hydroxide from lithium phosphate

A technology of lithium hydroxide and lithium phosphate, applied in the direction of lithium oxide;/hydroxide, chemical instruments and methods, phosphorus compounds, etc., can solve problems such as inappropriate application, long reaction time, and large energy consumption

Active Publication Date: 2019-08-02
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, a large amount of energy will be consumed when the electrolytic process is used, and the reaction time is too long when an anion precipitant is used, so it is not suitable for application in the actual process

Method used

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  • Method for producing lithium hydroxide from lithium phosphate
  • Method for producing lithium hydroxide from lithium phosphate
  • Method for producing lithium hydroxide from lithium phosphate

Examples

Experimental program
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preparation example Construction

[0027] The preparation method of lithium hydroxide according to one embodiment includes: adding more than one acid selected from hydrochloric acid, sulfuric acid and nitric acid into lithium phosphate slurry containing lithium phosphate particles; Alkaline substances are put into the slurry to be converted into lithium hydroxide aqueous solution.

[0028] First, the step of adding one or more acids selected from hydrochloric acid, sulfuric acid, and nitric acid to lithium phosphate slurry containing lithium phosphate particles will be described.

[0029] The term "lithium phosphate slurry" used in this specification means a state in which undissolved solid lithium phosphate particles are mixed in a saturated aqueous solution containing lithium phosphate.

[0030] Lithium phosphate has low solubility in water. That is, at room temperature (20°C), lithium phosphate (Li 3 PO 4 ) The solubility to water is about 0.039g / L.

[0031] However, if a small amount of acid is added to...

Embodiment 1

[0092] Embodiment 1: put in the conversion reaction of the lithium phosphate→lithium hydroxide of acid

[0093] Based on lithium phosphate, 0.5 N of sulfuric acid and distilled water were mixed to prepare 1 L of dilute sulfuric acid solution. Specifically, 37.18 g of sulfuric acid with a purity of 95% was added, and the sulfuric acid concentration of the prepared sulfuric acid solution was 3.7 wt%.

[0094] Lithium phosphate was added to the sulfuric acid solution prepared as above so that the amount of lithium in the slurry was 10 g / L, and stirred at 90° C. for 30 minutes to prepare a slurry.

[0095] The slurry was sampled, and the dissolution rate of lithium phosphate was analyzed. As a result, the dissolution rate of lithium phosphate was 81%.

[0096] Then, 1.1 equivalents of calcium hydroxide (Ca(OH) 2 ) and the slurry were put into the reactor, and stirred at room temperature (25° C.) for one hour, and then solid-liquid separation was performed using a vacuum filter t...

experiment example 1

[0108] Experimental example 1: Calculation of the conversion rate from lithium phosphate to lithium hydroxide

[0109] The conversion rate was calculated for the lithium hydroxide aqueous solution prepared according to Examples 1 to 4 and Comparative Example 1 and Reference Example 1.

[0110] Specifically, the conversion rate of lithium phosphate (LP)→lithium hydroxide (LH) was calculated using the total amount of lithium in lithium phosphate initially charged and the amount of lithium present in the aqueous solution after preparation of the lithium hydroxide aqueous solution. The formula used in the calculation of the conversion rate is the same as the following Mathematical Formula 1, and the calculation results are shown in Table 3 below.

[0111] [mathematical formula 1]

[0112]

[0113] 【table 3】

[0114]

[0115] Referring to Table 3, under the same conditions, Comparative Example 1, which did not use an acid, showed a conversion rate of about 27%.

[0116] On...

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Abstract

A method for producing lithium hydroxide according to an embodiment of the present invention comprises: a step for introducing at least one acid selected from the group consisting of hydrochloric acid, sulfuric acid, and nitric acid into a lithium phosphate slurry including lithium phosphate particles; and a step for introducing an alkali material into the lithium phosphate slurry into which the at least one acid has been introduced, and thereby converting the lithium phosphate slurry into a lithium hydroxide solution.

Description

technical field [0001] The present invention relates to a method for preparing lithium hydroxide from lithium phosphate, more specifically, relates to a method for converting lithium phosphate slurry containing lithium phosphate particles into an aqueous solution containing lithium hydroxide. Background technique [0002] Recently, with the rapid development of information technology (IT) and the electric vehicle market, the demand for lithium, which is the core raw material of secondary batteries, is expected to increase significantly. The lithium market for secondary batteries is highly weighted towards South Korea, China, and Japan, but South Korea is all dependent on imports, so a stable supply and demand approach is required. For this reason, the technology of extracting lithium from ore and brine is being developed, and among them, the technology of extracting lithium from brine has an advantage in terms of production cost. In South America and China, some companies h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02C01B25/30C01F11/46C01B25/32
CPCC01B25/30C01B25/32C01D15/02C01F11/46Y02E60/10C01B25/305Y02W30/84
Inventor 金倞焄李相民李锺学金畿永崔在爀孙修焕
Owner 浦项股份有限公司