Method for separating lithium from salt lake brine

A salt lake brine and lithium-rich technology, applied in the field of extraction chemistry and chemical industry, can solve the problems of environmental pollution, difficulty in separating the aqueous phase and the organic phase in the extraction system, etc., and achieve the effects of avoiding environmental pollution, good practical value, and simple process

Inactive Publication Date: 2014-12-24
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the disadvantages of this method are also obvious. The use of a large amount of volatile organic solvents in the extraction process will bring serious pollution to the environment. It is difficult to separate the aqueous phase and the organic phase in the system

Method used

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  • Method for separating lithium from salt lake brine

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Effect test

Embodiment 1

[0035] Adopt the method for extracting lithium from salt lake brine of the present invention, at first, add NaClO in the salt lake brine shown in Table 1 4 Solid, so that n(ClO4-):n(Li+)=2:1, mix evenly to configure the extraction water phase, filter to remove NaCl produced by the salting-out effect, and filter the water phase for later use. Among them, since the extraction system of this embodiment does not use ferric chloride, there is no need to add strong acid to adjust the pH value of the brine to prevent the hydrolysis of ferric ions and avoid the problem of three phases.

[0036] Then the volume ratio of the preparation is 80%TBP-20%[C 4 mim][PF 6 ] for the extraction of the organic phase.

[0037] The extracted organic phase and the extracted aqueous phase were added to the separatory funnel according to the preset volume ratio (O / A) in Table 2, shaken at 20°C for 10 minutes, and stood for 20 minutes to separate the two phases to obtain the lithium-rich organic phase...

Embodiment 2

[0044] In the description of this embodiment, the similarities with Embodiment 1 will not be repeated here, and only the differences with Embodiment 1 will be described. The difference between this embodiment and Example 1 is: n(ClO4-):n(Li+)=1:1, O / A=1:1, and then the volume ratio is 90%TBP-10%[C 4 mim][PF 6 ] to extract the organic phase, and adjust the different shaking times to obtain the extraction efficiency as shown in Table 3.

[0045] Table 3 Comparison of extraction efficiencies at different shaking times

[0046] Shock time (min)

[0047] Table 3 illustrates that the present embodiment has been substantially close to the extraction equilibrium within the shaking time of 8 minutes. Therefore, in combination with faster extraction balance and higher extraction efficiency, 8-10 minutes is selected as the better shaking time.

Embodiment 3

[0049] The organic phase obtained under the ratio O / A=2 in Example 1 was subjected to a stripping experiment: the volume ratio (A / O) of the hydrochloric acid to the lithium-rich organic phase was controlled as shown in Table 4, and different stripping ratios were adjusted. (A / O) obtained different stripping efficiencies are shown in Table 3.

[0050] Table 4 Different extraction efficiencies of different back extractions (at a temperature of 20°C)

[0051] A / O

[0052] Table 4 illustrates that stripping efficiency increases with the increase of stripping ratio, and the increase of aqueous phase volume is beneficial to Li + reversed phase extraction. Further, the stripping ratio (A / O) is preferably in the range of 2 to 3, and the stripping efficiency can reach more than 70%.

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Abstract

The invention discloses a method for separating lithium from salt lake brine. The method comprises the steps as follows: tributyl phosphate and an ionic liquid are mixed to obtain an extracted organic phase, wherein the volume ratio of the ionic liquid to tributyl phosphate is not higher than 1:1; perchlorate and the salt lake brine are mixed, wherein the ratio of lithium ions in the perchlorate to those in the salt lake brine is (0.5-3):1, and the extracted organic phase and an aqueous phase are oscillated and mixed for 8-12 min at room temperature at the volume ratio of (1-4):1 and is left to stand for 20 min to obtain a lithium-rich organic phase. According to the method for separating lithium from the salt lake brine, lithium is separated from the salt lake brine with high ratio of magnesium to lithium, the separating efficiency is high, and the problems of pollution caused by solvent volatilization and phase-splitting difficulty due to system emulsification are solved.

Description

technical field [0001] The invention relates to the technical fields of extraction chemistry and chemical industry, in particular to a method for separating lithium from salt lake brine. Background technique [0002] Lithium metal not only has an important application in the defense industry, but its importance in the national economy is also increasingly evident, especially in the field of energy, 6 Li and 7 Li is an important material for the fuel of future nuclear fusion reactors and nuclear fission reactions, respectively, and the demand for lithium as a battery material is also increasing. Therefore, lithium is known as "the energy metal of the 21st century". At present, the demand for lithium continues to grow at home and abroad, so the research, development and utilization of lithium resources are imminent. [0003] Salt lake brine is an important source of lithium. my country is rich in salt lake brine lithium resources, and its reserves rank among the top in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/40C22B26/12
CPCY02P10/20
Inventor 景燕石成龙贾永忠姚颖孙进贺谢绍雷
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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