Method for recovering lithium and producing high-purity boric acid or borax

A high-purity lithium recovery technology, applied in borates, boron oxyacids, chemical instruments and methods, etc., can solve the problems of high acid-base consumption, organic solvent pollution of brine, and large acid consumption, etc. The effect of high lithium ion yield, wide application range and low acid-base consumption

Active Publication Date: 2019-01-25
BEIJING QINGYUAN POWERISE TECH CO LTD +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The boron removal rate of this method is low, the acid consumption is large, and the boric acid obtained has low purity and poor economic value, and at the same time causes entrainment loss of lithium and other high value-added elements
[0016] Detachment boron removal method: use meglumine-based chelating resin to remove boron in brine by ion exchange. This method removes boron thoroughly, but it is only suitable for low boron content brine. At the same time, the consumption of acid and alkali is high, and at the same time Regenerated wastewater is generated, and some lithium elements enter the recycled w

Method used

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  • Method for recovering lithium and producing high-purity boric acid or borax

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Embodiment 1

[0040] see figure 1 , the present invention provides a reverse osmosis method from Na m Li n B x o y The method for reclaiming lithium in the solution and producing high-purity boric acid or high-purity borax comprises the steps:

[0041] a. Na m Li n B x o y Add acid to the solution to adjust the pH to 2.0-7.0;

[0042] b. Pump the pH-adjusted solution into the membrane system, and apply pressure on both sides of the reverse osmosis membrane to form a pressure difference. Part of the water and H in the solution 3 BO 3 Transmembrane migration from the high pressure side to the low pressure side;

[0043] c. Lithium ions on the high-voltage side are enriched to obtain lithium-rich, boron-poor brine;

[0044] d. The aqueous solution on the low-pressure side is a boric acid solution containing a small amount of lithium ions;

[0045] Among them, the Na m Li n B x o y In the solution, the content of B element is 100-15000ppm, and the content of lithium ion is 30-10...

Embodiment 2

[0057] Preferably, there is also provided a m Li n B x o y A method for recovering lithium in solution and producing high-purity boric acid or high-purity borax. The specific steps of the method are as follows:

[0058] a) adding acid to the feed brine to adjust the pH to 2-7;

[0059] b) will adjust the pH of the Na m Li n B x o y The solution is pumped into the first-stage reverse osmosis system, and pressure is applied on both sides of the reverse osmosis membrane to form a pressure difference to obtain the retentate 1 lithium-rich boron-poor brine and the filtrate 1 boric acid solution;

[0060] c) dialyzing the retentate 1 lithium-rich and boron-poor brine with pure water to obtain the retentate 2 lithium-rich and boron-poor brine and the filtrate 2 boric acid solution;

[0061] d) performing secondary filtration on filtrate 1 and filtrate 2 boric acid solution using reverse osmosis membrane to obtain retentate 3 and filtrate 3 high-purity boric acid solution;

...

Embodiment 3

[0072] Preferably, a kind of Na is also provided m Li n B x o y In the solution, the lithium ion content is 3000ppm, the sodium ion content is 2000ppm, the boron content is 6000ppm, the pH of the brine is 10.0, and the temperature of the brine is 35°C.

[0073] Preferably, the method for reclaiming lithium and producing high-purity boric acid or high-purity borax comprises the following steps:

[0074] a) adding hydrochloric acid to the feed brine to adjust the pH to 4.0;

[0075] g) will adjust the pH of the Na m Li n B x o y The solution is pumped into the first-stage reverse osmosis system, and pressure is applied on both sides of the reverse osmosis membrane to form a pressure difference. The pressure difference on both sides of the membrane is controlled to 60 bar, and the temperature of the brine is controlled to 27°C; the intercepted solution 1 is rich in lithium and poor in boron. Brine and filtrate 1 boric acid solution;

[0076] h) Lithium ion content 6000pp...

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Abstract

A method for recovering lithium and producing high-purity boric acid or borax comprises the steps that acid is added into a NamLinBxOy solution to adjust the pH to be 2.0-7.0, solution obtained afterpH adjustment is pumped into a membrane system, pressure is applied to the two sides of a reverse osmosis membrane to form a pressure difference, and part of water and H3BO3 in the solution are transferred from a high-voltage side to a low-pressure side through the membrane; lithium ions at the high-voltage side are enriched so as to obtain lithium-rich and poor-boron brine, and the aqueous solution on the low-pressure side is a boric acid solution containing a small quantity of lithium ions. The method is combined with a boron removal technology using a nanofiltration membrane method, the yield of the lithium ions is increased while boron elements in the brine are removed at low cost and at high efficiency, and comprehensive utilization of boron resources is achieved.

Description

technical field [0001] The present invention relates to a kind of method of reclaiming lithium and producing high-purity boric acid or borax, more particularly, relate to a kind of method from Na m Li n B x o y A method for recovering lithium in solution and producing high-purity boric acid or high-purity borax. Background technique [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 ...

Claims

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Application Information

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IPC IPC(8): C01B35/10C01B35/12C01D15/02C01D15/08B01D61/02
CPCB01D61/02C01B35/1045C01B35/122C01D15/02C01D15/08
Inventor 曹建勇袁桅赵清杨荣梅波
Owner BEIJING QINGYUAN POWERISE TECH CO LTD
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