Extraction system for extracting boric acid from magnesium-containing brine and extraction method thereof

An extraction and system technology, applied in the field of boric acid preparation, can solve the problems of high solvent loss, high cost, and economic inapplicability of the extractant, and achieve the effect of overcoming the problem of dissolution loss, solving the problem of loss, and optimizing the extraction effect.

Inactive Publication Date: 2018-05-11
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two most widely used extractants are monohydric alcohol extractant and binary fatty alcohol extractant; among them, the extraction performance of monohydric alcohol increases with the decrease of molecular weight, but the solubility of low molecular weight monohydric alcohol in brine Larger, the generated ester is easily hydrolyzed, and the separation is mainly achieved by phase balance, so the extraction effect is not ideal; relatively speaking, the six-membered ring boronic acid ester formed with boric acid is more stable and has a better effect on boric acid. The extraction effect, but its loss in the aqueous phase is also the main reason why it is difficult to apply in industry
[0005] At present, there are many reports on boron extraction by solvent extraction, such as: a method for extracting boric acid from boron-containing magnesium chloride solution, the raw material is acidified, filtered, extracted multiple times, stripped multiple times, filtered, hot-melt decolorized, filtered Boric acid product is obtained after deslagging, cold crystallization filtration, evaporation, and cold crystallization filtration. The extraction agent is a mixture of 2-octanol and iso-octanol in a ratio of 1:5 to obtain a monohydric mixed fatty alcohol with a main chain containing C5-C10 and branched chains. The recovery rate of boron can reach 95%; a kind of brine after extracting lit

Method used

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  • Extraction system for extracting boric acid from magnesium-containing brine and extraction method thereof
  • Extraction system for extracting boric acid from magnesium-containing brine and extraction method thereof
  • Extraction system for extracting boric acid from magnesium-containing brine and extraction method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] First of all, the old magnesium salt lakes after the potassium of salt lake brine is used as the extraction water phase, and the pH is 1.5, which contains 14.99g / L boric acid.

[0054] The main composition of the old magnesium salt lake is shown in Table 1.

[0055] Table 1 The main component of the old braised magnesium salt lake

[0056]

[0057] Then, with sulfide kerosene as a diluent, 2-butadyl-1-positive glycol (as shown in the following type 1-1) as the extracting agent, the extraction system composed of extracting agent and diluent The concentration of the extraction agent in the organic phase is 1.5mol / L, that is, the volume percentage of the extract agent in the corresponding extraction organic phase is 33.4 %.

[0058]

[0059] Again, the control extraction is 1, and the first -level extraction is performed at a room temperature at 25 ° C to obtain the organic phase and the extraction solution; Essence

[0060] Finally, the water is used as an anti -extract, ...

Embodiment 2

[0062] First of all, the old magnesium salt lake old halogen after the potassium of salt lake brine is used as the extraction water phase. The pH is 1.5, which contains 14.99g / L boric acid; the composition of the old salt lake old halogen is the same as the embodiment 1.

[0063] Then, with 1,2-dichloroethane as a diluent, the boron extracting agent with 2-hexyl-1-decirol (as shown in the following type 1-2), the extract system composed of extract agent and diluent is used as the Extracting organic phase, the concentration of extracting agent in organic phase is 1.5mol / L, that is, the volume percentage of the volume of the extract agent in the corresponding extraction organic phase is 43.3 %.

[0064]

[0065] Again, the control extraction is 1, and the first -level extraction is performed at a room temperature at 25 ° C to obtain the organic phase and the extraction solution; Essence

[0066] Finally, the water is used as an anti -extract, and the anti -extract is compared to 1...

Embodiment 3

[0068] First of all, the old magnesium salt lake old halogen after the potassium of salt lake brine is used as the extraction water phase. The pH is 1.5, which contains 14.99g / L boric acid; the composition of the old salt lake old halogen is the same as the embodiment 1.

[0069] Then, with kerosene as a diluent, 2-orthopedic -1-dulate (as shown in the following type 1-3) as the extracting agent, the extracting system composed of extracting agent and diluent is used as the extraction organic phase The concentration of the extraction agent in the organic phase is 1.5mol / L, that is, the volume percentage of the volume of the extraction agent in the organic phase of the organic phase is 53.2 %.

[0070]

[0071] Again, the control extraction is 1, and the first -level extraction is performed at a room temperature at 25 ° C to obtain the organic phase and the extraction solution; Essence

[0072] Finally, the water is used as an anti -extract, and the anti -extract is compared to 1....

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Abstract

The invention discloses an extraction system for extracting boric acid from magnesium-containing brine and an extraction method thereof. The system comprises an extractant and a diluent which are mixed with one another, wherein the structure of the extractant is as shown in the formula 1, in the formula 1, R1 is the alkyl group selected from C4-C8, and R2 is the alkyl group selected from C6-C10. According to the system, solubility of the extraction system in water is very low, the boric acid can be effectively extracted from the magnesium-containing brine, and extraction saturated capacity ofthe extraction system is high, emulsification does not easily occur, and the extraction system is more suitable for industrial production. Compared with a conventional alcohol extractant in the priorart, not only is the conflict between extraction performance of a monohydric alcohol extractant and the problem of solution loss caused by solubility solved, but also the problem of polyhydric alcoholextractant loss in an aqueous phase is solved. The invention further provides an extraction method for extracting the boric acid from the magnesium-containing brine based on the extraction system.

Description

Technical field [0001] The present invention is the field of boric acid preparation technology. Specifically, it involves an extraction method of extracting boric acid from magnesium salt lake brine and extracting boric acid based on the extract system from the magnesium salt lake brine. Background technique [0002] Boric acid is an important basic chemical raw material. It is an important component of glass fiber, insulation material, permanent magnet material, ceramic, detergent, pesticide, flame retardant and other chemical products. , National Defense, Agriculture, Medicine and many other industries have a important role in the development of many industries. At present, the shortage of domestic boron resources has threatened the development of related industries, especially my country's solid boron mine resources have been exhausted after decades of mining; while the salt lake brine in western my country contains rich liquid boron mines. [0003] At present, the salt lake b...

Claims

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Application Information

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IPC IPC(8): C01B35/10B01D11/04
CPCB01D11/0492C01B35/1081
Inventor 李丽娟彭小五时东张利诚宋富根聂锋姬连敏宋雪雪李慧芳韩文生
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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