Method for extracting boron from magnesium-containing saline lake bittern

An extraction and magnesium salt technology, applied in the direction of boron/boride, etc., can solve the problems of economic inapplicability, and achieve the effect of reducing theoretical series, less consumption, and wide application prospect.

Active Publication Date: 2012-10-31
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the 1,3-dibasic fatty alcohol 2-ethyl-1,3-hexanediol used in this application still loses more seriously in aqueous solution, and the solubility reaches 4.18g / L under normal temperature, which is economically inapplicable, thus limit its industrial application

Method used

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  • Method for extracting boron from magnesium-containing saline lake bittern
  • Method for extracting boron from magnesium-containing saline lake bittern
  • Method for extracting boron from magnesium-containing saline lake bittern

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The magnesium-containing salt lake old brine after acidification and potassium extraction of Chaerhan Salt Lake brine in Qaidam Basin, Qinghai is used as the raw material solution, which contains 12.64g / L boric acid and 86.80g / L magnesium ions, and the pH of the raw material solution is 1.3. Using sulfonated kerosene as diluent, 1-benzyl-2-methyl-1,3-butanediol as boron extractant, and the mixed solution composed of boron extractant and diluent as extraction organic phase, extraction The concentration of the boron extraction agent in the organic phase is 0.2mol / L, the flow ratio of the extracted organic phase to the raw material liquid is 1, and 3 stages of countercurrent extraction are carried out at 25°C, and an organic extract containing boric acid is obtained in the first stage, and finally The raffinate aqueous phase is obtained in the first stage, and the extract phase containing boric acid is collected for multistage countercurrent back extraction. After extracti...

Embodiment 2

[0037] The magnesium-containing salt lake old brine after acidification and potassium extraction of the Chaerhan Salt Lake brine in the Qaidam Basin in Qinghai is used as the raw material solution, which contains 14.210g / L boric acid and 96.268g / L magnesium ions, and the pH of the raw material solution is 2. Alcohol is used as a diluent, 2,2-dimethyl-4-phenyl-1,3-pentanediol is used as a boron extraction agent, and a mixed solution composed of a boron extraction agent and a diluent is used as an extraction organic phase, and the extraction The concentration of the boron extraction agent in the organic phase is 0.4mol / L, the flow ratio of the extracted organic phase to the raw material liquid is 0.5, and 6 stages of countercurrent extraction are carried out at 20°C, and an organic extract containing boric acid is obtained in the first stage. The raffinate aqueous phase is obtained in the first stage, and the extract phase containing boric acid is collected for multistage counter...

Embodiment 3

[0042] The magnesium-containing salt lake old brine after potassium extraction from the Chaerhan Salt Lake brine in the Qaidam Basin of Qinghai is used as a raw material solution, with a pH of 5.5, containing 1.144g / L boric acid and 100g / L magnesium ions, using toluene as a diluent, and using 2 , 3-dimethyl-4-phenyl-1,3-pentanediol is the boron extraction agent, the mixed solution composed of boron extraction agent and diluent is used as the extraction organic phase, and the boron extraction agent in the organic phase is extracted The concentration is 0.5mol / L, the flow ratio of the extracted organic phase to the raw material liquid is 1, 5 stages of countercurrent extraction are carried out at 20°C, the organic extract phase containing boric acid is obtained in the first stage, and the raffinate aqueous phase is obtained in the last stage , after collecting the extract phase containing boric acid, carry out multi-stage countercurrent back extraction. After extraction, the con...

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Abstract

The invention discloses a method for extracting boron from magnesium-containing saline lake bittern. The method comprises the following steps of: performing multi-stage counter-current extraction on an extract organic phase and raw material liquid by using magnesium-containing saline lake bittern as the raw material liquid, the aryl-containing1.3-binary fatty alcohol as a boron extracting agent and using mixed solution which consists of the boron extracting agent and diluent as the extract organic phase to prepare an extract phase containing boric acid; and performing multi-stage counter-current reextraction on a stripping agent and the extract phase containing boric acid by using aqueous alkali as the stripping agent to prepare boron-containing water solution. According to the method, the content of the boric acid in the magnesium-containing bittern is reduced to be below 30mg / L, while a borax product can be obtained; the extraction ratio of single-stage boric acid is up to over 90 percent, and the boric acid yield ratio is up to over 95 percent; and the method has the advantages of good boron extraction effect, reduced consumption of solvent, simple processes, easiness for industrialization and application and the like.

Description

technical field [0001] The invention relates to the development and comprehensive utilization technology of brine resources in salt lakes, belongs to the technical field of inorganic salt chemical industry, and specifically relates to a method for extracting boron from old brines in salt lakes containing magnesium. Background technique [0002] Boric acid is an important basic chemical raw material. It is an important component of many chemical products such as glass fibers, insulating materials, permanent magnet materials, ceramics, detergents, pesticides, and flame retardants. , national defense, agriculture, medicine and many other industries play an important role in the development. At present, the annual consumption of boric acid in China is about 320,000 tons, while the output can only be maintained at about 90,000 tons. The shortage of boron resources has threatened the development of related industries, especially the solid boron resources in my country have been in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/02
Inventor 鲍宗必熊妍任其龙邢华斌苏宝根杨启炜杨亦文
Owner ZHEJIANG UNIV
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