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A kind of method for separating boron from boron-containing brine

A technology of brine and water phase, applied in the direction of borate, boron oxide, etc., can solve the problems of complex process, high dissolution loss of organic phase, low boron separation efficiency, etc., and achieve high efficiency, low loss tolerance rate and low cost Effect

Active Publication Date: 2015-08-19
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

[0007] The technical problem to be solved by the present invention is to overcome the defects of low separation efficiency, high organic phase dissolution loss and complicated process for separating boron in boron-containing brine in the prior art, and provide a method for separating boron with high efficiency, low organic phase dissolution loss and simple process. A method for separating boron from boron-containing brine, which reduces the boron content in the aqueous solution to below 1 mg / L, meeting the requirements for boron content in the electrolytic preparation of metallic magnesium

Method used

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  • A kind of method for separating boron from boron-containing brine

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Experimental program
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Effect test

Embodiment 1

[0055] Adopt the method provided by the present invention to separate boron from boron-containing brine, wherein, boron-containing brine is the original brine of a salt lake, and its ion composition is:

[0056] the element

Mg 2+

Cl -

Na +

K +

B

SO 4 2-

Content (mg / L)

119000

345000

1500

4750

275

1450

[0057] experiment procedure:

[0058] Use 30% concentrated hydrochloric acid to adjust the pH of the original salt lake brine to 2.0; use 2.2-dimethyl-1-benzyl-1,3-propanediol and 2,2,5-trimethyl-1,3-hexanediol according 1:1 ratio is mixed to form the extractant, and benzene is used as the diluent, and the above-mentioned extractant and diluent are mixed at a volume ratio of 1:1 to obtain the extracted organic phase; Boron brine to obtain a boron-containing organic phase, wherein the extraction is centrifugal extraction, the centrifuge speed is 1500r / min, the complexation time is 1min, the extraction...

Embodiment 2

[0061] Adopt the method provided by the present invention to separate boron from boron-containing brine, wherein, boron-containing brine is magnesium sulfate mother liquor, and its ion composition is:

[0062] the element

Mg2+

Na+

K+

B

Cl-

SO42-

Content (mg / L)

56700

400

200

236

620

253200

[0063] experiment procedure:

[0064] Use 30% concentrated hydrochloric acid to adjust the pH of the original salt lake brine to 1.0; use 2-butyl-2-ethyl-1,3-hexanediol, 2.2-dimethyl-1-benzyl-1,3-propanediol according to 1:1 ratio is mixed to form the extractant, and toluene is used as the diluent, and the above extractant and the diluent are mixed in a volume ratio of 1:1 to obtain the extracted organic phase; Boron brine to obtain a boron-containing organic phase, wherein the extraction is centrifugal extraction, the centrifuge speed is 10000r / min, the complexation time is 10min, the extraction temperature is 35°C, th...

Embodiment 3

[0067] Adopt the method provided by the present invention to separate boron from boron-containing brine, wherein, boron-containing brine is magnesium nitrate mother liquor, and its ion composition is:

[0068] the element

Cl -

SO 4 2-

Ca 2+

Mg 2+

K +

Na +

B

Content (mg / L)

7210

460

33680

48970

1270

5260

178

[0069] experiment procedure:

[0070] Use 30% concentrated hydrochloric acid to adjust the pH of the original salt lake brine to 1.0; use 2-ethylhexanol, 2-ethyl-2-butyl-1,3-propanediol, Pentylene glycol is mixed according to the ratio of 1:1:1 to form the extractant, and p-xylene is used as the diluent, and the above-mentioned extractant and diluent are mixed at a volume ratio of 1:1 to obtain the extracted organic phase; the extracted organic phase is extracted using three-stage countercurrent Extract the boron-containing brine adjusted by pH value to obtain the boron-containing org...

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Abstract

A method for separating boron from boron-containing bittern comprises the steps as follows: the pH value of the boron-containing bittern is adjusted to be in a range from 1 to 4; an extraction agent and a diluent are mixed, so that an extraction organic phase is obtained; the pH-value-adjusted boron-containing bittern is extracted through the extraction organic phase, so that a boron-containing organic phase is obtained; a stripping agent is used for stripping the boron-containing organic phase, so that an organic phase and a water phase are obtained; and the water phase is subjected to evaporation, concentration and crystallization, so that boric acid or borate is obtained. According to the method, monohydric alcohol, dihydric alcohol or mixed alcohol containing the monohydric alcohol and the dihydric alcohol is taken as the extraction agent, an aromatic hydrocarbon is taken as the diluent, and the extraction agent and the diluent are mixed, so that the extraction organic phase is obtained; the pH-value-adjusted boron-containing bittern is subjected to multistage extraction through the extraction organic phase, so that the boron-containing organic phase is obtained; and the stripping agent is used for stripping the boron-containing organic phase; and the water phase is subjected to evaporation, concentration and crystallization, so that the boric acid or the borate is obtained, the boron in the boron-containing bittern is separated, and the boron separation efficiency is high.

Description

【Technical field】 [0001] The invention relates to a method for separating boron in boron-containing brine, in particular to a method for separating boron from boron-containing brine. 【Background technique】 [0002] Boric acid is an important basic chemical raw material, which is widely used in national economic construction. At present, the annual consumption of boric acid in China is about 320,000 tons, but the output can only be maintained at about 90,000 tons. The shortage of boron resources has threatened the development of related industries. There is a large amount of boron in the salt lake, mostly in the form of liquid ore. How to separate high-purity boron from boron-containing brine is an urgent problem to be solved. [0003] At present, the methods for separating boron from boron-containing brine mainly include: acidification removal method, precipitation method, adsorption method, solvent extraction method and other methods. Because the solvent extraction method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/10C01B35/12
Inventor 李法强王敏彭正军时历杰祝增虎康为清诸葛芹
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI