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Method for preparing lithium hydroxide and lithium carbonate by utilizing soluble lithium-salt solution

A technology of lithium salt solution and lithium hydroxide, which is applied in the direction of lithium oxide;/hydroxide, lithium carbonate;/acid carbonate, etc., can solve the problem of reducing the operating efficiency of bipolar membrane electrodialyzers and increasing Energy consumption and other issues to achieve the effect of avoiding cumbersome processes and pollution discharge links, saving energy consumption and material costs

Active Publication Date: 2017-10-27
JIANGSU LITHITECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the two-chamber bipolar membrane electrodialyzer, the hydrogen ions generated by the hydrolysis of the bipolar membrane will pass through the positive membrane to the alkali chamber, reducing the operating efficiency of the bipolar membrane electrodialyzer and increasing energy consumption

Method used

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  • Method for preparing lithium hydroxide and lithium carbonate by utilizing soluble lithium-salt solution
  • Method for preparing lithium hydroxide and lithium carbonate by utilizing soluble lithium-salt solution
  • Method for preparing lithium hydroxide and lithium carbonate by utilizing soluble lithium-salt solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] Use crude lithium carbonate as raw material to prepare battery-grade lithium hydroxide and battery-grade lithium carbonate (see image 3 ).

[0096] 1. Heating ball milling fine washing process of lithium concentrate

[0097] Collect the lithium concentrate (40%-60% crude lithium carbonate) produced by the sun pool of Zhabuye Salt Lake in Tibet, crush it, and then carry out heating ball refining, washing, and centrifugal filtration to form the refined ore (coarse lithium carbonate) and washed liquid. The refined ore enters the lithium sulfate solution configuration process, and the washing liquid enters the comprehensive utilization process.

[0098] Table 1: Zabuye lithium concentrate analysis table (mass percentage content, %)

[0099] project

Li

Ca

Mg

Na

K

Fe 2 o 3

％

10.371

0.372

0.145

16.143

0.996

0.16

project

SO 4 2-

Al

SiO 2

Cl -

CO 3 2-

acid insoluble matter

...

Embodiment 2

[0115] Preparation of battery-grade lithium carbonate from lithium-rich brine.

[0116] Collect intercrystalline brine from Yiliping Salt Lake in Qinghai Province, China, and concentrate through natural evaporation in the salt pan to form potash ore and boron-lithium brine. The ion-selective electrodialysis process is implemented on the boron-lithium brine to form the following lithium-rich brine.

[0117] Table 3: Analysis table of lithium-rich brine (unit: g / l)

[0118] project

Li +

Mg 2+

Ca 2+

Cl -

SO 4 2-

K +

B 3+

Na +

g / l

7.66

5.32

0.05

65.76

0.16

2.16

0.1

5.82

[0119] 1. React lithium-rich brine with lithium lye to causticize magnesium removal

[0120] Mix the lithium-rich brine and the lithium lye prepared by the back-end bipolar membrane electrodialysis process in a heating reactor, control the reaction temperature at 60°C, form magnesium hydroxide sediment, and control the mixed...

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Abstract

The invention discloses a method for preparing lithium hydroxide and lithium carbonate by utilizing a soluble lithium-salt solution. The method comprises the following steps: the soluble lithium-salt solution is used as a raw material to produce the battery-level lithium hydroxide, and a lithium hydroxide solution is utilized to produce the high-purity lithium carbonate. The method is characterized in that various soluble lithium-salt solutions (the lithium solutions are expressed as LiX in the description) can be utilized, and a bipolar membrane electrodialyzer is applied to treat the soluble lithium-salt solutions, so that a higher-concentration LiOH solution and a corresponding HX acidic solution are obtained; the HX acidic solution returns to a previous-stage process for preparing the lithium salt solution; and the LiOH solution is subjected to evaporation concentration and crystallization to obtain the battery-level lithium hydroxide solid, and the produced lithium hydroxide solution can be further reacted with a carbon dioxide gas through a gas-liquid reactor, so that the high-purity lithium carbonate is obtained. The method can realize continuous stable production with low energy consumption, free pollution and large scale, and realize low-cost and high-efficiency manufacture of the battery-level lithium hydroxide and the high-purity lithium carbonate.

Description

technical field [0001] The invention relates to a method for producing lithium hydroxide and lithium carbonate by using a novel bipolar membrane electrodialyzer as the core of the process. Specifically, the present invention relates to a method of using various soluble lithium salt solutions as raw materials to form a lithium hydroxide solution and a corresponding acid solution through a bipolar membrane electrodialyzer, and further, evaporating and crystallizing the lithium hydroxide solution into battery-grade hydroxide Lithium, or react lithium hydroxide solution with carbon dioxide to generate high-purity lithium carbonate, and the resulting acid solution is returned to the front-end process for the preparation of lithium salt solution. Background technique [0002] In the synthesis process of lithium battery cathode materials and lithium battery electrolytes, lithium hydroxide has a better synthesis effect than lithium carbonate. With the rapid development of China's b...

Claims

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Application Information

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IPC IPC(8): C01D15/08C01D15/02
CPCC01D15/02C01D15/08C01P2006/80
Inventor 郭发云龚政
Owner JIANGSU LITHITECH CO LTD
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