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Method for extracting lithium from lithium-containing solution

A lithium solution and lithium extraction technology, applied in the field of lithium extraction, can solve the problems of poor magnesium-lithium separation effect, low adsorption capacity, and low recovery of lithium, and achieve the effects of easy industrialization, high reactivity, and simple operation.

Active Publication Date: 2015-06-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This makes most of the development of salt lakes in my country limited to potassium extraction, while lithium is rarely recovered, resulting in a serious waste of resources.
At present, many methods for extracting lithium from salt lake brine have been developed, such as precipitation method, solvent extraction method, calcination leaching method, electrodialysis method, carbonization method, and ion exchange adsorption method. A method for extracting lithium from brine [patent application number: 02145583.X], through the preparation of aluminum salt adsorbent LiCl 2 ·Al(OH) 3 ·nH 2 O to adsorb lithium in brine, but the adsorbent LiCl prepared by this method 2 ·Al(OH) 3 ·nH 2 The adsorption capacity of O for lithium is low, and the working adsorption capacity for Li is usually 2-3mgLi + / g; some people will AlCl 3 Add NaOH to the brine synchronously, using the Al(OH) generated in situ 3 To adsorb and precipitate lithium, but this method needs to consume a large amount of AlCl 3 and NaOH, the production cost is high, and because NaOH is directly added to the brine, part of the Mg in the brine is converted into Mg(OH) 2 Precipitation in the form of magnesium and lithium, the separation effect of magnesium and lithium is poor, and the final lithium product is difficult to meet the use requirements

Method used

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  • Method for extracting lithium from lithium-containing solution

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Aluminum powder and KCl are mixed at a mass ratio of 2:5, and then ball-milled for 4 hours at a ball-to-material ratio of 30:1; then the pH value of the solution with a Li concentration of 1.5g / L and a Mg concentration of 30g / L is adjusted to 7. Then mix the ball milling mixture with the content solution at a liquid-solid ratio of 3:1, control the molar ratio of aluminum in the ball milling mixture to lithium in the solution to 2:1, react at a temperature of 20°C for 30 minutes, pass solid-liquid The lithium-containing precipitate was separated, wherein the mass ratio of magnesium to lithium was 1:2, and the lithium content was 31.8 mg / g. The XRD detection pattern of the precipitate was as follows figure 1 shown.

Embodiment 2

[0024] Mix the aluminum powder and NaCl at a mass ratio of 1:5, then ball mill for 2 hours at a ball-to-material ratio of 20:1; then adjust the pH value of the solution with a Li concentration of 0.5g / L and a Mg concentration of 25g / L to 6. Then mix the ball mill mixture with the content solution at a liquid-solid ratio of 5:1, control the molar ratio of aluminum in the ball mill mixture to lithium in the solution to be 3:1, react at a temperature of 0°C for 60 minutes, and pass solid-liquid The lithium-containing precipitate was separated, wherein the mass ratio of magnesium to lithium was 1:2.5, and the lithium content was 26.5 mg / g.

Embodiment 3

[0026] Aluminum powder and Na 2 SO 4 Mix according to the mass ratio of 1:10, and then ball mill for 10h according to the ball-to-material ratio of 15:1; then adjust the pH value of the solution with a Li concentration of 800mg / L and a Mg concentration of 30g / L to 7, and then ball mill the mixture Mix with the content solution at a liquid-solid ratio of 10:1, control the molar ratio of aluminum in the ball milling mixture to lithium in the solution to 4:1, react at a temperature of 50°C for 20 minutes, and obtain a lithium-containing precipitate by solid-liquid separation , wherein the mass ratio of magnesium to lithium is 1:6, and the lithium content is 32.4mg / g.

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Abstract

The invention discloses a method for extracting lithium from a lithium-containing solution. The method comprises the following steps: mixing and ball-milling aluminum and an activating agent so as to activate the aluminum powder, then performing the reaction of the activated aluminum powder and the lithium-containing solution, and extracting lithium by settling, with other components left in the solution. The method is suitable for extracting lithium from various materials with different lithium content. The method has the advantages of short technological process, simplicity in operation, good selectivity in lithium extraction and high efficiency.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for extracting lithium from a lithium-containing solution. Background technique [0002] Lithium is the lightest alkali metal element in nature. Its metals and compounds are widely used in traditional fields such as metallurgy, manufacturing, glass ceramics, petrochemicals, textiles, synthetic rubber, lubricating materials, and medical treatment. In recent years, lithium has become more and more important in the fields of aerospace, nuclear energy, battery energy and lithium aluminum alloys. It has become a very important metal in industry and is known as "the energy metal of the 21st century". [0003] Lithium resources mainly occur in salt lakes and granite pegmatite deposits, among which salt lake lithium resources account for 87% of the global lithium reserve base. With the growth of market demand, mineral lithium resources are in short supply, and the mi...

Claims

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Application Information

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IPC IPC(8): C22B26/12
Inventor 陈星宇赵中伟刘旭恒
Owner CENT SOUTH UNIV