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Method for reducing content of NaCl in LiCl

A content and mass ratio technology, applied in the field of chemical separation, can solve the problems of high sodium content and low LiCl yield

Inactive Publication Date: 2011-08-31
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to repeated washing in this method, a large amount of Li 2 CO 3 Dissolution loss resulting in lower LiCl yield and still higher sodium content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 100g aqueous solution containing 66.8g LiCl and 20.3g NaCl was passed into HCl gas until the content of hydrochloric acid in the solution reached 10mol / L, NaCl crystallized and separated, NaCl was separated by filtration, washed twice with 8mol / L hydrochloric acid (10ml×2), and combined into the mother liquor , The solution was evaporated until no HCl gas emerged, and the NaCl mass content in the LiCl product obtained was 1.5% (compared with LiCl mass).

Embodiment 2

[0016] 100g aqueous solution containing 66.8g LiCl and 20.3g NaCl was passed into HCl gas until the content of hydrochloric acid in the solution reached 9mol / L, NaCl crystallized and separated, NaCl was separated by filtration, washed twice with 10mol / L hydrochloric acid (10ml×2), combined into the mother liquor , The solution was evaporated until no HCl gas emerged, and the NaCl mass content in the obtained LiCl product was 1.2% (compared with LiCl mass).

Embodiment 3

[0018] 100g containing 66.8gLiCl and 20.3gNaCl aqueous solution, add 200ml of analytically pure concentrated hydrochloric acid containing HCl35%, until the hydrochloric acid content in the solution reaches 8mol / L, NaCl crystallizes out, NaCl is separated by filtration, washed twice with 8mol / L hydrochloric acid (10ml × 2), merged into mother liquor, the solution was evaporated to no HCl gas, and the NaCl mass content was 1.4% (compared with LiCl mass) in the LiCl product obtained.

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PUM

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Abstract

The invention provides a method for reducing content of NaCl in LiCl, and the method comprises the following steps: (1) dissolving NaCl-containing coarse LiCl solid into water at a mass ratio of (0.3-0.8):1, or concentrating a NaCl-containing LiCl solution until the solution is saturated; (2) introducing volatile hydrogen chloride gas or direct concentrated hydrochloric acid into the solution obtained by the step (1), so that the NaCl is separated out from the solution in a crystallizing way due to the common-ion effect, the LiCl is still remained in the solution, and the NaCl can be effectively eliminated from the solution after filtration; and (3) eliminating the volatile hydrogen chloride or concentrated hydrochloric acid from the solution in a heating way to obtain a LiCl solution. The method can be used for effectively eliminating the NaCl from a NaCl-LiCl mixture, so that the content of the NaCl in the LiCl can be reduced to be less than 1.8%, the content of the LiCl in the separated NaCl solid can be less than 1%.

Description

technical field [0001] The invention relates to a chemical separation method, in particular to a method for reducing the NaCl content in LiCl. Background technique [0002] Lithium chloride is an important basic raw material of lithium salt, which is often used to prepare metallic lithium and other lithium compounds. Due to the particularity of lithium and its compounds during use, the requirements for the impurity content are relatively high. For example, when preparing lithium metal, it is required that the Na content in LiCl must be lower than 1%. [0003] At present, lithium compounds at home and abroad are extracted from lithium-containing salt lakes or lithium ores. Although the extraction process of lithium salt is different due to the different components of salt lakes and ores, the basic process of preparing lithium chloride can be summarized as follows: concentration and enrichment of Li after drying salt or decomposing ore with acid → removing the aqueous soluti...

Claims

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Application Information

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IPC IPC(8): C01D15/04C01D3/04
Inventor 杨瑛李通张海军
Owner LANZHOU UNIVERSITY
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