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Continuous ion exchange method for separating lithium from salt lake brine

A salt lake brine and separation technology, applied in the field of continuous separation and separation, can solve the problems of low utilization rate and utilization efficiency of adsorption materials, long process operation process, high production and treatment costs, etc., achieve target ion yield improvement, simple automatic control system, The effect of improving the recovery rate

Pending Publication Date: 2021-04-23
XIAN LANSHEN NEW MATERIAL TECHNOLOGY CO LTD
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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 to provide a continuous detachment method for separating lithium from salt lake brine in view of the deficiencies in the above-mentioned prior art, so as to solve the problems in the prior art due to the low utilization rate and utilization efficiency of the adsorption material and the lithium recovery rate. Low cost, high production and processing costs, long process operation process and difficult equipment maintenance

Method used

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  • Continuous ion exchange method for separating lithium from salt lake brine
  • Continuous ion exchange method for separating lithium from salt lake brine
  • Continuous ion exchange method for separating lithium from salt lake brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060]figure 1 withfigure 2 In the first suction zone resin column set, 1 group, 1 of the second suction zone resin column, and the first group is 6 resin columns, and the second group is 7, the top fluid zone resin. The column is 1 group, which is 4 resin columns, and the resin column is 1 group, each group of 6 resin columns. The temperature of 15 ° C is used in a temperature of 15 ° C, which is derived from a temperature of 15 ° C which is 15 ° C which is 15 ° C medium, and the temperature of 15 ° C is a pyrolysis liquid, and the valve is passed through the center rotation valve, respectively. Valve switching time is 15 minutes) The corresponding first adsorption region feed tube (24 #), the second adsorption region feed tube (11-23 #), a top-liquid feed tube (7-10 #), analytical liquid feed After the tube (1-6 #) enters the corresponding resin column, the entire process is achieved from the corresponding number of discharge tubes, respectively.

[0061]1. The first adsorption regio...

Embodiment 2

[0069]The feed temperature and the center rotation valve switching time were used in the same manner as in Example 1, respectively, respectively, and each liquid phase composition was shown in Table 4.

[0070]1. The first adsorption region control feed flow rate is controlled at 0.35 bv / h to obtain an adsorption tail solution to recovery into a top-liquid storage tank.

[0071]2, the second adsorption region controls the feedstream flow rate to adsorb in 2.2bv / h, adsorbing the tail liquid L2-1 discharge tail liquid storage, and finally returned to the salt field, the recovery of lithium in the second adsorption region was 86.2%.

[0072]3, the top fluid zone control feed flow rate control is controlled at 1.6 bv / h to carry out the top fluid, and the topcogen is returned to the brine storage tank again.

[0073]4, the desorption liquid region control the feed flow rate control at 1.5 bv / h, using pure water as a parsing medium, and the obtained analytical solution L2-2 medium is used as ...

Embodiment 3

[0075]The feed temperature and the center rotation valve switching time were used in the same manner as in Example 1, respectively, respectively, and each liquid phase composition was shown in Table 4.

[0076]1. The first adsorption region controls the feedstream flow rate to adsorb at 0.6 bv / h, and the adsorption tail is recovered to the top liquid storage tank.

[0077]2, the second adsorption area controls the feedstream flow rate control at 3 BV / h to adsorb the tail liquid L3-1 emissions tail liquid storage, and finally returned to the salt field, the recovery of lithium in the second adsorption region is 84.14%.

[0078]3, the top fluid zone control feed flow rate control is carried out in 2BV / H to return to the brine storage tank again.

[0079]4, the desorption liquid region controls the feedstream flow rate control at 2BV / H to perform a top fluid, and the pure water is used as the parsing medium, and the obtained analytical solution L3-2 medium is used as the product fluid.

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Abstract

The invention discloses a continuous ion exchange method for separating lithium from salt lake brine. The method comprises the following steps that a feeding flow rate is controlled, the salt lake brine is fed into a first adsorption zone of an ion exchange column and a second adsorption zone of the ion exchange column, and tail liquid containing lithium and other hetero-ions adsorbed by the first adsorption zone is collected to serve as a liquid ejection raw material; lithium-poor brine tail liquid adsorbed by the second adsorption zone is collected by means of an adsorption discharge pipe and returns to a salt pan; a feeding flow rate is controlled, the liquid ejection raw material is fed into a liquid ejection zone of the ion exchange column to conduct a liquid ejection process, and the ejected tail liquid is used for cyclic adsorption; and a feeding flow rate of a desorption medium is controlled, a desorption solution medium is fed into a desorption solution zone of the ion exchange column for desorption, desorbed tail liquid is collected, and an obtained desorption solution is taken as a product solution. According to the method, a separation process of lithium is realized by adopting simple steps, and the method has the characteristics of simplicity, easiness in operation and the like, and has a good application prospect.

Description

Technical field[0001]The present invention belongs to the technical field of lithium electric energy raw material production, and in particular, the present invention relates to a continuous lexation method for separating lithium from salt lake.Background technique[0002]Lithium and its compounds are widely used in many areas such as electronics, metallurgical, chemical, pharmaceutical, energy, and have a very important position in the national economy and national defense construction. In recent years, the application of lithium in new energy and new materials has increased, driving the booming of the international lithium market, high-quality lithium salt production has become a focus and hotspots of everyone, so pursue low production costs, high recycling Rate and high purity lithium salt production technology will become the main attack direction of lithium salt production in the 21st Century.[0003]Lithium salt production technology varies from the source of raw materials to olit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/12C22B3/42
CPCY02P10/20
Inventor 谭晓龙毛新宇冯志军梅昂孙冰杰
Owner XIAN LANSHEN NEW MATERIAL TECHNOLOGY CO LTD
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