Method for separating elemental boron from boron-containing brine by nanofiltration

A technology of brine and nanofiltration, which is applied in the direction of borate, lithium halide, boron oxide, etc., can solve the problems that boron ore products cannot meet the needs of domestic economic construction, cannot realize the comprehensive utilization of boron resources, and rely on imports of boron products, etc. Achieve the effect of increasing lithium ion yield, low cost and low cost

Active Publication Date: 2019-01-15
QINGHAI TUS QINGYUAN NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional brine boron removal technologies include: dilution salt method, acid addition boron removal method, ion exchange boron removal method, extraction boron removal method, etc., which have high cost of impurity removal, low efficiency, large loss of lithium ions, narrow application range, and cannot Realize the limitations of comprehensive utilization of boron resources
Although China is rich in boron ore resources, boron ore products cannot meet the needs of domestic economic construction, and boron products rely heavily on imports

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Preferably, a method for separating boron from boron-containing brine by nanofiltration is also provided, wherein in the brine, the content of lithium ions is 22g / L, the content of sodium ions is 15g / L, and the content of chloride ions is 136g / L. The boron content is 1800ppm, the brine pH is 4.0, and the brine temperature is 35°C. The specific boron element separation steps are as follows:

[0059] a) adding sodium hydroxide to the feed brine to adjust the pH to 9.5;

[0060] b) The bittern with adjusted pH is pumped into the first-level nanofiltration system, and pressure is applied on both sides of the nanofiltration membrane to form a pressure difference. The pressure difference on both sides of the membrane is controlled to be 27bar, and the temperature of the controlled brine is 27°C; Retentate boron-rich brine 1 and permeate boron-poor brine 1;

[0061] c) lithium ion content in boron-poor brine 1 is 22g / L, sodium ion content is 15g / L, chloride ion content is 13...

Embodiment 2

[0068] Preferably, a method for separating boron from boron-containing brine by nanofiltration is also provided, wherein in the brine, the content of lithium ions is 18g / L, the content of sodium ions is 12g / L, and the content of chloride ions is 111g / L. The boron content is 3300ppm, the brine pH is 12.7, and the brine temperature is 29°C. The specific boron element separation steps are as follows:

[0069] a) adding hydrochloric acid to the feed brine to adjust the pH to 10.0;

[0070] b) The brine with adjusted pH is pumped into the primary nanofiltration system, and pressure is applied on both sides of the nanofiltration membrane to form a pressure difference. The pressure difference on both sides of the membrane is controlled to be 37 bar, and the temperature of the brine is controlled to be 28.5°C; Retentate boron-rich brine 1 and permeate boron-poor brine 1;

[0071] c) lithium ion content in boron-poor brine 1 is 18g / L, sodium ion content is 12g / L, chloride ion content...

Embodiment 3

[0081] Preferably, a method for separating boron from boron-containing brine by nanofiltration is also provided, wherein in the brine, the content of lithium ions is 8g / L, the content of sodium ions is 5g / L, and the content of chloride ions is 48.9g / L , the boron content is 200ppm, the pH of the brine is 5.6, and the temperature of the brine is 41°C. The specific boron element separation steps are as follows:

[0082] a) adding sodium hydroxide to the feed brine to adjust the pH to 9.5;

[0083] b) The brine with adjusted pH is pumped into the first-stage nanofiltration system, and pressure is applied on both sides of the nanofiltration membrane to form a pressure difference. The pressure difference on both sides of the membrane is controlled to be 18 bar, and the temperature of the brine is controlled to be 17° C.; Retentate boron-rich brine 1 and permeate boron-poor brine 1;

[0084] c) The lithium ion content in boron-poor brine 1 is 8g / L, the sodium ion content is 5g / L, ...

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Abstract

In the process of comprehensive utilization of brine resources, especially in the process of lithium extraction from brine, boron in the brine is usually removed as an impurity. Traditional boron removal technologies include a method of dilution for salt formation, a method of acidification for boron removal, a method of ion exchange for boron removal, a method of extraction for boron removal, etc., and have the limitations of high cost for impurity removal, low efficiency, great loss of lithium ions, a narrow application scope, incapability of realizing comprehensive utilization of boron resources, etc. Although China is rich in boron resources, boron rock products cannot meet the needs of domestic economic construction, and boron products rely heavily on imports. The invention relates toa membrane-process boron removal technology which can remove elemental boron in brine at low cost and high efficiency, improve the yield of lithium ions and realizes the comprehensive utilization ofboron resources.

Description

technical field [0001] The invention relates to a method for separating boron element from boron-containing brine by nanofiltration method, especially a method for separating boron element from complex brine system. Background of the invention [0002] Boron is necessary for the formation of ribonucleic acid, an essential building block of life. James Stephenson, a postdoctoral researcher at the NASA Astrobiology Institute at the University of Hawaii, said: "Boron may be important for the origin of life on Earth because it stabilizes nucleic acids, which are important components of ribonucleic acid. In early life, Ribonucleic acid is considered to be the informational precursor of deoxyribonucleic acid." [0003] The scientific community does not know enough about the absorption and metabolism of boron. Boron is easily absorbed in the diet, and most of it is excreted in urine. It is combined with oxygen in the blood and is H. 3 BO 3 or B(OH) 4 - , boric acid forms ester...

Claims

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Application Information

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IPC IPC(8): C01B35/12C01D3/06C01D15/04
Inventor 曹建勇袁桅赵清杨荣梅波
Owner QINGHAI TUS QINGYUAN NEW MATERIAL CO LTD
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