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Fixed-bed adsorption method for removing boron from salt lake magnesium chloride brine

A technology of fixed bed adsorption and magnesium chloride, applied in the direction of improving process efficiency, etc., can solve the problems of high production cost and complicated extraction process

Inactive Publication Date: 2013-03-27
SUNRESIN NEW METERIALS CO LTD XIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"Brine Extraction and Boron Removal" ("Light Metals" No. 7, 1995) has a corresponding report, but the extraction process is complicated and the production cost is very high. The boron content in the brine after boron removal is 20-300ppm, and it needs to be combined with other The boron removal method can meet the raw material requirements of magnesium chloride brine electrolysis to produce metal magnesium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Chelating resin LSC-800 (Xi'an Lanxiao Technology New Materials Co., Ltd.)

[0036] The steps for removing boron from chelating resin are as follows:

[0037] (1) Adsorption: Load 600ml of LSC-800 chelating resin into a Ф30*1000mm plexiglass column with a jacket, pass the salt lake magnesium chloride brine with a boron ion content of 273ppm, and pass the chelate at a flow rate of 5BV / h at 25°C Resin, the processing capacity is 10BV, and the mixed sample of the effluent is tested by ICP (inductively coupled plasma spectrometer). The boron ion content is 0.7ppm, and the boron ion removal rate is 99.7%.

[0038] (2) Washing: Pass the resin column filled with resin after (1) adsorption into deionized water to replace the magnesium chloride brine remaining in the resin. The flow rate of 2BV / h through the chelating resin at 25℃, the amount of 2BV, take the instantaneous sample at the end of the effluent 2BV and measure 1.0g / ml with a densitometer. The effluent is close to the densi...

Embodiment 2-9

[0041] Comparative experiment under the same temperature and different adsorption rate of boron removal

[0042] Chelating resin LSC-800 (Xi'an Lanxiao Technology New Materials Co., Ltd.), the experimental device is the same as in Example 1, the boron ion content of the salt lake magnesium chloride brine is 231ppm, the operating temperature is 25℃, and the effluent samples are taken to detect the boron ion content by ICP , And compare with boron ion removal rate.

[0043] Name

Embodiment 9-15

[0045] Comparative experiment of adsorption and removal of boron at the same adsorption rate and different temperature

[0046] Chelating resin LSC-800 (Xi'an Lanxiao Technology New Materials Co., Ltd.), the experimental device is the same as in Example 1, the boron ion content of the salt lake magnesium chloride brine is 156ppm, the adsorption rate is 2BV / h, and the effluent samples are taken for ICP detection of boron The ion content is compared with the removal rate of boron ion.

[0047] Name

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PUM

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Abstract

The invention discloses a fixed-bed adsorption method for removing boron from salt lake magnesium chloride brine. The fixed-bed adsorption method comprises the following steps: (1), adsorbing: removing boron ion in the salt lake magnesium chloride brine containing boron through resin; (2), leaching: removing the residual brine in the resin which is adsorbed with boron by a leaching agent, returning the brine to a drying salt pond; (3), desorbing: removing the born adsorbed on the leached resin by strippant, so that the resin recovers adsorptive property and can be re-used for an adsorption process. The method provided by the invention is adopted, so that the content of the boron in the magnesium chloride brine can be reduced to be lower than 1pp, and the removal rate of the boron reaches more than 99% for providing d a reliable and stable material to electrolyze magnesium chloride to produce magnesium metal.

Description

Technical field [0001] The invention relates to a fixed-bed adsorption method for removing boron from salt lake magnesium chloride brine, in particular to a method for removing boron during the electrolysis of salt lake magnesium chloride brine to produce metal magnesium after potassium salt is extracted. Background technique [0002] my country's salt lake resources are very rich in the world, and have advantages over the United States, Russia and other major countries. One is the large number and scale, and the other is the shallow burial. In addition to the main components of sodium, potassium, and magnesium, the salt lake also has important minerals such as boron and lithium, which are also quite abundant. [0003] After potassium chloride is produced from salt lake brine, it is particularly important for the comprehensive development of magnesium chloride-rich brine. For every ton of potassium chloride produced, 10 tons of bischofite (magnesium chloride containing six crysta...

Claims

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Application Information

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IPC IPC(8): C22B3/24C25C3/04
CPCY02P10/20
Inventor 寇晓康郭福民王程王日升陈绍添王刚刘琼
Owner SUNRESIN NEW METERIALS CO LTD XIAN
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