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Novel method for extracting lithium from salt lake brine

A technology for extracting lithium from salt lake brine, applied in the field of lithium extraction, can solve the problems of complicated process and high production cost, and achieve the effect of simple process operation and reduced production cost

Active Publication Date: 2011-05-25
SUNRESIN NEW METERIALS CO LTD XIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing method for extracting lithium from salt lake brine needs to further remove magnesium from the effluent, the process is complicated, and the production cost is high; for this reason, the present invention provides a method for extracting lithium from lithium-containing brine Methods

Method used

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  • Novel method for extracting lithium from salt lake brine
  • Novel method for extracting lithium from salt lake brine
  • Novel method for extracting lithium from salt lake brine

Examples

Experimental program
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Effect test

Embodiment 1

[0024]

[0025] Cation exchange resin: Xi'an Lanxiao Technology Co., Ltd., gel type strong acid cation exchange resin LSD-010.

[0026] Resin magnesium removal steps:

[0027] Put the cation exchange resin into a Φ30*1000mm plexiglass column, pass it into the salt lake brine, pass through the gel-type strong acid cation exchange resin column at a flow rate of 5BV / H, treat 0.1BV, and take the effluent to detect the content of magnesium and lithium by atomic absorption method Respectively: 0.002g / L and 4.8g / L, the lithium ion content of the effluent is concentrated by a reverse osmosis membrane to reach 25g / l, and solid sodium carbonate is added to precipitate lithium carbonate.

[0028] The ratio of magnesium to lithium in the concentrated brine is Mg / Li<350.

Embodiment 2

[0030] The salt lake brine comes from Taijier Lake in Qinghai, and the composition of the salt lake brine is the same as in Example 1;

[0031] Cation exchange resin: Xi'an Lanxiao Technology Co., Ltd., macroporous strong acid cation exchange resin D001.

[0032] Resin pretreatment: 7% Nacl solution for 3 resin bed volumes, washed with water until the conductivity is less than 50us.

[0033] Resin magnesium removal steps:

[0034] Put the cation exchange resin into a Φ30*1000mm plexiglass column, pass it into the salt lake brine, pass through the macroporous strong acid cation exchange resin column at a flow rate of 5BV / H, treat 0.2BV, and take the effluent to detect the content of magnesium and lithium by atomic absorption method, respectively 0.055g / L and 5.1g / L, the lithium ion content of the effluent is concentrated by reverse osmosis membrane to reach 25g / l, and solid sodium carbonate is added to precipitate lithium carbonate.

Embodiment 3

[0036] The salt lake brine comes from Taijier Lake in Qinghai, and the composition of the salt lake brine is the same as in Example 1;

[0037] Cation exchange resin: Xi'an Lanxiao Technology Co., Ltd., macroporous strong acid cation exchange resin SEPLITE SC-20.

[0038] Resin pretreatment: 7% Nacl solution for 3 resin bed volumes, washed with water until the conductivity is less than 50us.

[0039] Resin magnesium removal step: put the cation exchange resin into a Φ30*1000mm plexiglass column, pass it into the salt lake brine, pass through the macroporous strong acid cation exchange resin column at a flow rate of 5BV / H, treat 0.3BV, and take the effluent to detect magnesium by atomic absorption method Lithium content and lithium content are respectively: 6.7g / L and 5.4g / L, described effluent is concentrated lithium ion content reaches 25g / l through reverse osmosis membrane, adds solid sodium carbonate, precipitates out lithium carbonate.

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Abstract

The invention discloses a method for extracting lithium from lithium-containing brine. The method comprises the following steps: (1) concentrating salt lake brine through evaporation in a solarization pool or through forced evaporation to ensure that the lithium content reaches 400mg / l-30g / l; and (2) passing the concentrated salt lake brine obtained in the step (1) through cation exchange resin at the rate of 1-30 BV / H to remove magnesium in the salt lake brine, and carrying out concentration and precipitation to obtain lithium carbonate. The method has the advantages of low consumption of chemical raw materials, simple technique and no pollution, and is easy to operate.

Description

technical field [0001] The invention relates to a new method for extracting lithium from salt lake brine, in particular to a method for extracting lithium from concentrated lithium-containing salt lake brine with a magnesium-lithium ratio Mg / Li<350 and concentrated lithium-containing old brine in salt fields. Background technique [0002] Metal lithium and its compounds have great application prospects in energy and new materials, and lithium extraction from salt lake brine will become the main direction of lithium salt production in the 21st century. 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 brine account for about 70-80% of the total lithium resources. Therefore, lithium extraction from salt lake brine will become the main way of lithium salt production. The lithium salt products (calculated as lithium carbonate) produced...

Claims

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Application Information

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IPC IPC(8): C01D15/00C22B3/42C22B26/12
CPCY02P10/20
Inventor 寇晓康李岁党王刚边维娜
Owner SUNRESIN NEW METERIALS CO LTD XIAN
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