Method for preparing lithium hydroxide through electrolysis of salt lake brine

A lithium hydroxide, salt lake brine technology, applied in the electrolysis process, electrolysis components and other directions, can solve the problems of the product quality is difficult to reach the excellent standard, the brine refining process is complicated, the material flow is large, and the cost is low and the scope of application is wide. , the effect of low impurity content

Active Publication Date: 2014-07-16
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the two production methods have mature technical routes and simple process flow, they have large material circulation, high energy consumption, high cost, and serious environmental pollution, and the product quality is difficult to reach the superior standard.
U.S. patent US20110044882 is a refinement of U.S. patent US4036713. Although it has attracted attention to the production of lithium hydroxide by electrolysis of brine, and has applied for patents in many countries, the range of operating conditions has been further narrowed, but it is only for brine with relatively low magnesium content, and The refining process of brine is relatively complicated, the current efficiency is low, and the relatively expensive ion membrane is used, and the cost is relatively high
The method of electrolyzing lithium sulfate to produce lithium hydroxide has low current efficiency and high energy consumption, and the influence of impurity ions on current efficiency, voltage, and energy consumption needs to be further optimized

Method used

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  • Method for preparing lithium hydroxide through electrolysis of salt lake brine

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Effect test

Embodiment 1

[0044] (1) Preparation of refined brine

[0045] The saturated magnesium chloride brine obtained by evaporating and concentrating the salt field in the sun is firstly adjusted with hydrochloric acid to keep the pH value at 1.5. Boron in the brine is precipitated as boric acid. After solid-liquid separation, add lime or slaked lime in proportion, fully stir and filter to remove Magnesium and sulfate, to obtain a low-boron, low-sulfur electrolysis raw material solution. Then use a two-step method to remove magnesium at a temperature of 50-70°C. First, adjust the pH of the solution to 8.5 with lithium hydroxide. The generated magnesium hydroxide combines with excess magnesium ions to positively charge and adsorb boron ions in the solution. Solid-liquid Separate and remove most of the magnesium, then adjust the pH of the solution to 11.5 with the mother liquor lithium hydroxide solution and lithium carbonate solution after crystallization separation, remove the remaining magnesium...

Embodiment 2

[0055] (1) Preparation of refined brine

[0056] The saturated magnesium chloride brine obtained by evaporating and concentrating the salt fields in the sun is firstly adjusted with hydrochloric acid to keep the pH value at 2.5, boron in the brine is precipitated as boric acid, after solid-liquid separation, add lime or slaked lime in proportion, fully stir and filter to remove Magnesium and sulfate, to obtain a low-boron, low-sulfur electrolysis raw material solution. Then use a two-step method to remove magnesium at a temperature of 50-70°C. First, adjust the pH of the solution to 9.5 with lithium hydroxide. The generated magnesium hydroxide combines with excess magnesium ions to positively charge and adsorb boron ions in the solution. Solid-liquid Separation and removal of most of the magnesium, and then use the mother liquor lithium hydroxide solution or lithium carbonate solution after crystallization to adjust the pH of the solution to 12.5, remove the remaining magnesiu...

Embodiment 3

[0066] (1) Preparation of refined brine

[0067] The saturated magnesium chloride brine obtained by evaporating and concentrating the salt fields in the sun is firstly adjusted with hydrochloric acid to keep the pH value at 2. Boron in the brine is precipitated with boric acid. After solid-liquid separation, add lime or slaked lime in proportion, fully stir and filter to remove Magnesium and sulfate, to obtain a low-boron, low-sulfur electrolysis raw material solution. Then use a two-step method to remove magnesium at a temperature of 50-70°C. First, adjust the pH of the solution to 9 with lithium hydroxide. The generated magnesium hydroxide combines with excess magnesium ions to positively charge and adsorb boron ions in the solution. Solid-liquid Separate and remove most of the magnesium, then adjust the pH of the solution to 12 with the mother liquor lithium hydroxide solution and lithium carbonate solution after crystallization separation, remove the remaining magnesium, c...

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Abstract

The invention discloses a method for preparing lithium hydroxide through electrolysis of salt lake brine. The method comprises steps of (1) evaporating and concentrating original lithium containing salt lake brine through insolation in a salt pan, so as to obtain the brine with high magnesium-lithium ratio; (2) removing impurities in the brine with high magnesium-lithium ratio so as to obtain refined brine; (3) electrolyzing with the refined brine as anode liquor and lithium hydroxide solution as cathode liquor, and obtaining lithium hydroxide monohydrate solution in a cathode chamber through a cation membrane; (4) evaporating and concentrating, cooling and crystallizing, washing and drying the lithium hydroxide monohydrate solution so as to obtain lithium hydroxide monohydrate. The method can prepare a high-purity product, has low cost and high yield of lithium, is simple and is easy to control.

Description

technical field [0001] The invention belongs to the field of electrolytically preparing lithium hydroxide, in particular, the invention relates to a method for electrolyzing salt lake brine to prepare lithium hydroxide. Background technique [0002] Lithium is one of the important strategic resources, and has important strategic significance in the national defense industry and the development of high technology in the country. my country is a country with a very wide distribution of salt lakes. The salt lake lithium resources are relatively rich. In the salt lake area of ​​Qinghai alone, there are tens of millions of tons of lithium chloride stored. To speed up the development of lithium resources and improve the level of lithium industry is the current lithium industry in my country. A new content in the rapid development of industry and urgent research. [0003] As one of the important primary lithium products in lithium and its compounds, lithium hydroxide can be further...

Claims

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Application Information

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IPC IPC(8): C25B1/16C25B1/26
Inventor 李法强王敏祝增虎彭正军贾国凤诸葛芹时历杰赵有璟李锦丽龚龑王青磊
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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