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Method and device for extracting boron from saline brine by using air-floatation polymers

A salt lake brine and polymer technology, applied in the direction of boron/boride, etc., can solve the problem of not wide pH range, and achieve the effect of fast extraction speed and wide range of solution pH adaptability

Active Publication Date: 2014-07-02
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the extractants used to extract boron from salt lake brine are all organic alcohol extractants. The disadvantage of this type of extractant is that the applicable pH range of the extraction system is not wide.
However, none of the air flotation extraction methods in the prior art can effectively extract boron from salt lake brine.

Method used

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  • Method and device for extracting boron from saline brine by using air-floatation polymers
  • Method and device for extracting boron from saline brine by using air-floatation polymers
  • Method and device for extracting boron from saline brine by using air-floatation polymers

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Effect test

specific Embodiment 1

[0048] Take B 2 o 3 300ml of salt lake brine with a mass fraction of 0.1% is filled to such figure 1 shown in the air flotation extraction column. Air is blown in from the gas inlet 1 shown in the figure, and the blowing rate is 0.1mL / min. From figure 1 The indicated water-soluble polymer aqueous solution inlet 5 was added 1.5 mL of a polymer polyethylene glycol PEG (molecular weight: 2000) aqueous solution at a rate of 0.01 mL / min at a rate of 0.01 mL / min. The bubble foam at the top of the air flotation extraction column is collected by the foam scraper 10, the boron in the foam is back-extracted with hydrochloric acid, and the boron concentration in the salt lake brine water sample flowing out from the salt lake brine outlet 3 is analyzed, and the boron air flotation extraction rate is calculated to be 85%. .

specific Embodiment 2

[0049] Take B 2 o 3 300ml of salt lake brine with a mass fraction of 3% is filled to such figure 1 shown in the air flotation extraction column. Nitrogen is blown in from the gas inlet 1 shown in the figure, and the blowing rate is 100mL / min. From figure 1 The water-soluble polymer aqueous solution inlet 5 shown in the figure adds 240 mL of an aqueous solution of polymer ethylene oxide-propylene oxide copolymer (EOPO) (molecular weight: 2500) with a polymer mass fraction of 80% at a rate of 0.01 mL / min. The bubble foam at the top of the air flotation extraction column is collected by the foam scraper 10, the boron in the foam is back-extracted with hydrochloric acid, and the boron concentration in the salt lake brine water sample flowing out of the salt lake brine outlet 3 is analyzed, and the boron air flotation extraction rate is calculated to be 82%. .

specific Embodiment 3

[0050] Take B 2 o 3 300ml of salt lake brine with a mass fraction of 0.01% is filled to such figure 1 shown in the air flotation extraction column. Air is blown in from the gas inlet 1 shown in the figure, and the blowing rate is 20mL / min. From figure 1The water-soluble polymer aqueous solution inlet 5 shown in the figure adds 30 mL of a high molecular polymer polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer aqueous solution with a mass fraction of high molecular polymer of 8% at a rate of 2 mL / min. The bubble foam at the top of the air flotation extraction column is collected by the foam scraper 10, the boron in the foam is back-extracted with hydrochloric acid, and the boron concentration in the salt lake brine water sample flowing out of the salt lake brine outlet 3 is analyzed, and the boron air flotation extraction rate is calculated to be 80%. .

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Abstract

The invention discloses a method and a device for extracting boron from saline brine by using air-floatation polymers. The method comprises the following steps: saline brine is filled in an air floatation extraction column, air are bubbled inside from the lower end of the air floatation extraction column, a water-soluble polymer aqueous solution is added from a U-shaped draft tube on the side wall of the air floatation extraction column, the polymer aqueous solution is mixed with overflow saline brine in the U-shaped draft tube, the mixed solution is sprayed into the air floatation extraction column via a feeding ring, bubbles generated above the air floatation extraction column are collected through a scraping plate, and boron in the bubbles is recovered by back extraction. The method is completed by using the air floatation extraction column which comprises a hollow cylinder, an air inlet, an air distributor, the feeding ring, the U-shaped draft tube positioned on the outer wall outside the hollow cylinder, a water-soluble polymer aqueous solution inlet and the bubble scraping plate; according to the method and the device, polymer molecule micro-aggregates formed by the water-soluble polymer in the saline brine are utilized to trap boron, the vanadium-contained polymer molecule micro-aggregates are trapped by air floatation, and the method and the device are suitable for extracting vanadium from various saline brines.

Description

technical field [0001] The invention belongs to the technical field of boron extraction from salt lake brine, and in particular relates to a method and a device for extracting and extracting boron from salt lake brine by an air flotation polymer. Background technique [0002] Boron is one of the important rare elements in the earth's crust. It is widely used in various sectors of the national economy because of its excellent insulation, temperature resistance, friction resistance and flame retardancy in materials. my country is rich in boron resources, but the usable or easy-to-process boron-magnesium ore (white boron) only accounts for 6.7% of the domestic reserves. With the continuous expansion of boron application fields, only extracting boron from boron ore is far from meeting the market demand, so it is of great significance to develop other available boron resources. There are abundant boron resources in the salt lakes in western my country. Extracting boron from sal...

Claims

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Application Information

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IPC IPC(8): C01B35/02
Inventor 黄焜林洁媛刘会洲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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