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Method for deeply removing magnesium through chelating resin for extracting lithium from salt lake brine

A technology of salt lake brine and brine, applied in separation methods, chemical instruments and methods, lithium carbonate; Easy operation, less raw materials, and the effect of improving yield and purity

Active Publication Date: 2014-03-26
SUNRESIN NEW METERIALS CO LTD XIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of magnesium in the primary magnesium removal solution is still as high as about 100 mg / L, and the content of magnesium will increase in the subsequent concentration process, which will affect the yield and purity of lithium carbonate in the process of precipitating lithium carbonate with sodium carbonate

Method used

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  • Method for deeply removing magnesium through chelating resin for extracting lithium from salt lake brine
  • Method for deeply removing magnesium through chelating resin for extracting lithium from salt lake brine
  • Method for deeply removing magnesium through chelating resin for extracting lithium from salt lake brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The raw brine of the salt lake (see Table 1 for components) is treated with a lithium adsorbent (aluminum hydroxide-based lithium adsorbent AI-8 produced by the Beijing Institute of Chemical Industry and Metallurgy of the Nuclear Industry), the adsorption flow rate is 2-10 BV / h, and the average adsorption capacity It is 2.8-3.3 g / L. Using water as the eluent, the dosage is 0-18BV to obtain the desorption solution with the ratio of magnesium to lithium in the range of 1:1-10:1. Different desorption solutions are then treated with cation exchange resin LSD-010 (produced by Xi'an Lanxiao Technology Co., Ltd.), and the ratio of magnesium to lithium is reduced to below 1:1 to obtain magnesium removal solution (referred to as primary magnesium removal solution).

Embodiment 2

[0020] Take the primary magnesium removal solution obtained in Example 1, in which the lithium content is 720 mg / L, and the magnesium content is 700 mg / L (the ratio of magnesium to lithium is 0.97:1). Take 100ml of LSC-100 aminocarboxylic acid chelating resin (produced by Xi'an Lanxiao Technology Co., Ltd.), and put it into a jacketed plexiglass resin column to pretreat the resin (the plexiglass resin column is customized by the laboratory, The jacket can keep the temperature of the resin column constant and stable. The heat preservation water in the jacket is produced by a constant temperature water bath, and the water circulation is driven by a peristaltic pump. The following methods are the same). The pretreatment method is: treat with 400ml of 4% sodium hydroxide solution for 40min, wash with water until neutral, then treat with 400ml of 5% hydrochloric acid solution for 40min, wash with water until neutral for later use. Pass 1000ml of the primary magnesium removal soluti...

Embodiment 3

[0022] Take the primary magnesium removal solution obtained in Example 1, in which the lithium content is 512 mg / L, and the magnesium content is 132 mg / L (the ratio of magnesium to lithium is 0.26:1). Take 100ml of LSC-500 aminophosphonic acid chelating resin (produced by Xi'an Lanxiao Technology Co., Ltd.), put it into the exchange column, and pretreat the resin. The pretreatment method is: treat with 400ml of 4% sodium hydroxide solution for 40min, wash with water until neutral, then treat with 400ml of 5% hydrochloric acid solution for 40min, wash with water until neutral for later use. Pass 5000ml of qualified magnesium removal solution through LSC-500 resin at 0°C at a flow rate of 20 BV / h to obtain a magnesium content of 0.82 mg / L and a lithium content of 503 mg / L in the effluent mixed solution. Concentrated by evaporation, Na 2 CO 3 Precipitate, filter and wash to obtain 14.9g Li 2 CO 3 , a purity of 99.2%, and a total yield of 97%.

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Abstract

The invention discloses a novel method for deeply removing magnesium for extracting lithium from salt lake brine, characterized in that: salt lake brine is processed by lithium adsorbent and cation exchange resin to obtain a magnesium removing liquid having the ratio of magnesium to lithium being less than 1 to 1, further magnesium removal is carried out through chelating resin at a temperature of 0-100 DEG C with a speed of 0.5-20 BV / h, and then condensation and deposition are carried out to prepare lithium carbonate. The method has the advantages of low chemical raw material consumption, simple process, easy operation, and no pollution, and the obtained product has low content of magnesium and high purity of lithium.

Description

technical field [0001] The invention relates to a novel magnesium removal method for extracting lithium from salt lake brine, in particular to a chelating resin magnesium removal method for extracting lithium carbonate from salt lake brine with a high magnesium-to-lithium ratio, and belongs to the field of hydrometallurgy. Background technique [0002] Lithium metal and its compounds have great application prospects in energy and new materials. Lithium resources in nature mainly occur in granite pegmatite deposits, salt lake brine, sea water and geothermal water. According to statistics, the reserves of lithium resources in salt lake brines account for about 70-80% of the total lithium resources. Therefore, extracting lithium from salt lake brines will become the main way to produce lithium salts. At present, lithium salt products (calculated as lithium carbonate) produced from brine in the world have accounted for more than 85% of the total lithium products. Lithium extrac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/08B01D15/04
Inventor 寇晓康王刚李岁党刘琼
Owner SUNRESIN NEW METERIALS CO LTD XIAN