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An extraction and brine technology, which is applied in the field of lithium extraction from brine, can solve the problems of extraction equipment corrosion, restriction of industrial application, and high concentration of tributyl phosphate, and achieve the effects of reducing corrosion, eliminating emulsification, and reducing application restrictions
Inactive Publication Date: 2020-12-11
CHANGSHA RES INST OF MINING & METALLURGY
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However, the concentration of tributyl phosphate in this system is high, which severely corrodes the extraction equipment, and tributyl phosphate degrades in acidic medium, especially its severe swelling effect on plastic materials limits its application. Adding amide compounds to butyl ester and diluent to form a composite extraction system can effectively reduce the amount of tributyl phosphate and reduce its application restrictions, but the amide compounds in the extraction system are weakly alkaline, and the ferric iron in the solution It is easy to hydrolyze ferric iron during contact and emulsify the extraction process, which seriously restricts its industrial application
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Embodiment 1
[0023] The method for extracting lithium from brine of the present embodiment comprises the following steps:
[0024] (1) Get 70ml tributyl phosphate and 30ml sulfonated kerosene to be configured into an organic solution, and the organic solution and the ferric chloride solution with an iron ion concentration of 70g / L are mixed and extracted according to O / A=1:1, and mixed The time is 3min to obtain the first organic phase containing ferric ions;
[0025] (2) Add 20ml of tributyl phosphate, 40ml of amide extractant (A101N,N'-dinormal acetamide in this example), and 40ml of sulfonated kerosene into the first organic phase to form tributyl phosphate 45% of ester, 20% of amide extractant, 35% of sulfonated kerosene, and the second organic phase of loaded iron 35g / L;
[0026] (3) the second organic phase is taken 50ml and pH is 0.5, Li content is 2.8g / L, Mg content is 115.2g / L, Cl content is the high magnesium lithium ratio salt lake brine of 205.9g / L by comparison O / A=2:1 for ...
Embodiment 2
[0028] The method for extracting lithium from brine of the present embodiment comprises the following steps:
[0029] (1) Get 70ml tributyl phosphate and 30ml sulfonated kerosene to be configured into an organic solution, and the organic solution and the ferric chloride solution with an iron ion concentration of 50g / L are mixed and extracted according to O / A=5:3, and mixed The time is 5min to obtain the first organic phase containing ferric ions;
[0030] (2) Add 20ml of tributyl phosphate, 40ml of amide extractant (N,N-bis(2-ethylhexyl)acetamide is used in this example), and 40ml of sulfonated kerosene to the first organic phase to form a compound containing The second organic phase of 45% tributyl phosphate, 20% amide extractant, 35% sulfonated kerosene, and 25g / L iron loading;
[0031] (3) the second organic phase is taken 50ml and pH is 3, Li content is 3.2g / L, Mg content is 118.9g / L, Cl content is the high magnesium lithium ratio salt lake brine of 213.3g / L by comparison...
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Abstract
The invention discloses a method for extracting lithium from brine. According to the method, tributyl phosphate, an amide compound and a diluent are used as extraction agents and ferric salt as a co-extraction agent to extract the brine. The method comprises the following steps of: (1) preparing the co-extraction agent into a solution to obtain a co-extraction agent solution; carrying out mixed extraction on the co-extraction agent solution, the tributyl phosphate and the diluent, and separating to obtain a first organic phase; (2) adding the amide compound, the tributyl phosphate and the diluent into the first organic phase to obtain a second organic phase; and (3) mixing the second organic phase with the brine, extracting, and separating to obtain a lithium-containing extracting solution. According to the method for extracting the lithium from the brine, an emulsification phenomenon easily occurring during extraction of the tributyl phosphate and the amide compound can be eliminated,smooth operation of an extraction process is ensured, application limitation of an amide extraction agent is reduced, corrosion condition of extraction equipment during extraction can be reduced, andthe industrial application of the tributyl phosphate and the amide compound as the extraction agent is facilitated.
Description
technical field [0001] The invention relates to the field of chemical metallurgy, in particular to a method for extracting lithium from brine. Background technique [0002] The content of lithium in salt lake brine is relatively high, accounting for 66% of the world's lithium reserves and more than 80% of the lithium reserve base. Lithium extraction from salt lake brine has the advantages of rich resources, simple process, low cost, and strong market competitiveness, and has become the main way to develop and produce lithium salts at home and abroad. my country is rich in lithium resource reserves, ranking second in the world's currently proven lithium resource reserves, of which liquid ore lithium resources account for 79% of China's total lithium resources. Lithium-containing salt lake brines in China generally have a high magnesium-lithium ratio of 40 to 1800. How to extract lithium from salt lake brines with high magnesium-lithium ratios is a difficult problem. Domesti...
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