Method for preparing lithium carbonate through salt lake brine

A technology of salt lake brine and lithium carbonate, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problems of high extraction cost and high energy consumption by direct evaporation and concentration of analytical solution, so as to reduce energy consumption, easy to operate, The effect of low energy consumption

Active Publication Date: 2016-12-21
JIANGSU HELPER FUNCTIONAL MATERIALS
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  • Claims
  • Application Information

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Problems solved by technology

The invention consumes a lot of energy for direct evaporation and concentration of the analytical solution, resulting in high extraction costs

Method used

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  • Method for preparing lithium carbonate through salt lake brine
  • Method for preparing lithium carbonate through salt lake brine
  • Method for preparing lithium carbonate through salt lake brine

Examples

Experimental program
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Embodiment 1

[0026] The process of extracting lithium carbonate from salt lake brine with high magnesium-lithium ratio is as follows:

[0027] (1) Add 24L of hybrid nanocrystalline lithium extraction adsorbent (patent number 201410065121.4) into the adsorption column, add 48L of brine for adsorption, after the adsorption is saturated, add 24L of pure water for desorption, and obtain 24L of coarse lithium eluent.

[0028] (2) 24L coarse-grade lithium eluent is passed into the nanofiltration system. If the magnesium content is higher than 2g / L, a second-stage nanofiltration is used to obtain the magnesium-removing eluent.

[0029] (3) The 17L magnesium removal eluent is passed into the forward osmosis system, and 4mol / L ammonium bicarbonate is used as the drawing solution. Ammonium bicarbonate has a high solubility in water, so a high osmotic pressure is generated, and lithium-rich The water molecules in the solution are attracted to the other side of the permeable membrane, so as to achieve...

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Abstract

The invention discloses a method for preparing lithium carbonate through salt lake brine. The method comprises the following steps of firstly adsorbing the salt lake brine through a high-property lithium extraction adsorbent, then performing nanofiltration for removing magnesium, performing forward osmosis and preliminary concentration, performing deep magnesium removal, performing multiple-effect evaporation, and performing sedimentation so as to obtain the battery-grade lithium carbonate. According to the method disclosed by the invention, an adsorption method, a membrane method and an evaporation method are organically combined together, so that the energy consumption is greatly reduced, and the cost is reduced; and besides, the lithium carbonate prepared by the method disclosed by the invention is high in purity and stable in quality. The method disclosed by the invention has the advantages of being simple and convenient to operate, low in energy consumption, stable in effects and the like.

Description

technical field [0001] The invention relates to the field of chemical extraction, in particular to a method for preparing lithium carbonate from salt lake brine. Background technique [0002] Lithium carbonate is the raw material for preparing various lithium compounds. It is the product with the largest output and the widest application among lithium salt products. It is widely used in chemical industry, metallurgy, ceramics, medicine, refrigeration and other industries, and can also be used to prepare catalysts for chemical reactions. Known as "industrial monosodium glutamate". [0003] my country's lithium resource reserves rank first in the world, but for a long time, more than 80% of the lithium carbonate needed by domestic enterprises has been dependent on imports. With the continuous technology research and development of lithium resource mining in recent years, China can gradually get rid of its dependence on foreign lithium products. At present, the lithium reserv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
CPCC01D15/08C01P2006/80
Inventor 蔡建国石洪雁
Owner JIANGSU HELPER FUNCTIONAL MATERIALS
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