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Boric acid composite extractant and method for recovering boric acid, magnesium and lithium from salt lake old brine

A compound extractant, the technology of salt lake old brine, applied in lithium carbonate;/acid carbonate, magnesium carbonate, boron oxyacid, etc., can solve the problem of unsatisfactory extraction rate, high energy consumption, and dosage of chemicals Large and other problems, to achieve the effect of high-value recovery

Inactive Publication Date: 2021-02-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because salt lake brine has the characteristics of high magnesium and low lithium ratio, and the content of boron is small, the efficiency of acidification method and precipitation method is not high, and a large amount of chemical reagents are needed, so it has not been widely promoted; fractional crystallization needs to use forced ammonia distillation The method enables different salts in the salt lake to be crystallized and separated step by step within the suitable temperature range, and finally the boron-containing mother liquor is cooled to obtain boron-containing mother liquor, and borax is obtained by cooling, but this method has extremely high requirements for equipment. High energy consumption and other issues
[0006] At present, the most widely used extraction method is mainly based on the extraction method. A large amount of boron can be extracted from the brine through the extraction method, but the extraction rate of the existing extraction agent is not ideal, and multi-stage extraction is usually required, and the extraction efficiency is relatively low. The process is complex, the amount of medicament used is large, and the prospect of industrial practical application is not ideal

Method used

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  • Boric acid composite extractant and method for recovering boric acid, magnesium and lithium from salt lake old brine
  • Boric acid composite extractant and method for recovering boric acid, magnesium and lithium from salt lake old brine
  • Boric acid composite extractant and method for recovering boric acid, magnesium and lithium from salt lake old brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) the old brine of the salt lake is acidified with hydrochloric acid to adjust the pH value to 1.25, then adopt 20% mixed alcohol (isooctanol, isoamyl alcohol, 2-ethyl-1,3 hexanediol mixed alcohol (mass ratio 1:1:1) extraction, 80% sulfonated kerosene as diluent, control O / A to 1:1, after one-stage extraction of B, the extraction rate of B reaches 92.01%, back extraction with 0.1mol / L NaOH solution , O / A is 1:1, get H 3 BO 3 , after concentration and crystallization to obtain H 3 BO 3 product;

[0056] (2) Precipitate the brine after removing B with ammonia water, control the reaction temperature to 70°C, control the reaction pH to 8.0, and the reaction time is 2h, filter and wash to obtain Mg(OH) 2 Product, the recovery rate of Mg is 93.6%;

[0057] (3) Add ammonia water and ammonium bicarbonate to a section of the mother liquor of heavy magnesium, adjust the pH to 9.0, the amount of ammonium bicarbonate is 1.5 times the theoretical amount, control the reaction ...

Embodiment 2

[0060] (1) The old brine of the salt lake is acidified with hydrochloric acid to adjust the pH value to 1.25, and then 30% of mixed alcohol (isooctanol, isoamyl alcohol, 2-ethyl-1,3 hexanediol mixed alcohol (1: 1:1) extraction, 70% sulfonated kerosene as diluent, control O / A to 1:1, after one-stage extraction B, the extraction rate of B reaches 98.177%, back extraction with 0.1mol / L NaOH solution, O / A 1:1, get H 3 BO 3 , after concentration and crystallization to obtain H 3 BO 3 product;

[0061] (2) Precipitate the brine after removing B with ammonia water, control the reaction temperature to 70°C, control the reaction pH to 8.0, and the reaction time is 2h, filter and wash to obtain Mg(OH) 2 Product, the recovery rate of Mg is 93.6%;

[0062] (3) Add ammonia water and ammonium bicarbonate to a section of heavy magnesium mother liquor, adjust the pH to 9.0, the amount of ammonium bicarbonate is 1.5 times of the theoretical amount, control the reaction temperature at 60°C...

Embodiment 3

[0065] (1) The old brine of the salt lake is acidified with hydrochloric acid to adjust the pH value to 1.25, then adopt 40% mixed alcohol (the mixed alcohol of isooctyl alcohol, isoamyl alcohol, 2-ethyl-1,3 hexanediol (mass ratio 1:1:1)) extraction, 60% sulfonated kerosene as diluent, control O / A to 1:1, after primary extraction B, the extraction rate of B reaches 99%, back extraction with 0.1mol / L NaOH solution , O / A is 1:1, get H 3 BO 3 , after concentration and crystallization to obtain H 3 BO 3 product;

[0066] (2) Precipitate the brine after removing B with ammonia water, control the reaction temperature to 70°C, control the reaction pH to 8.0, and the reaction time is 2h, filter and wash to obtain Mg(OH) 2 Product, the recovery rate of Mg is 93.6%;

[0067] (3) Add ammonia water and ammonium bicarbonate to a section of heavy magnesium mother liquor, adjust the pH to 9.0, the amount of ammonium bicarbonate is 1.5 times of the theoretical amount, control the reactio...

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Abstract

The invention belongs to the field of salt lake chemical industry, and particularly relates to a boric acid composite extractant, which comprises isooctyl alcohol, isoamyl alcohol and 2-ethyl-1, 3-hexanediol. The invention also provides a method for extracting boric acid from salt lake old brine by adopting the boric acid composite extractant, and a method for extracting boron, magnesium and lithium from salt lake old brine through gradient separation. The invention innovatively finds that isooctyl alcohol, isoamyl alcohol and 2-ethyl-1, 3-hexanediol have unexpected synergism in the aspect ofboric acid extraction, and the single-stage extraction rate of boric acid can be effectively improved.

Description

technical field [0001] The invention belongs to the field of salt lake chemical industry and relates to a method for preparing boric acid, magnesium hydroxide, basic magnesium carbonate and magnesium oxide by adopting step separation to extract boron, magnesium and lithium from salt lake brine. Background technique [0002] There are many salt lakes in my country, which are rich in boron, magnesium, lithium and other resources. Among the salt lake resources, potassium, sodium, magnesium, lithium and boron are the most abundant and have large reserves. With the rapid development of my country's economy and the rise of new energy vehicles, the demand for potassium, boron, magnesium, lithium, especially lithium resources has increased sharply, and the development of salt lake resources has become unprecedentedly important. [0003] In the development and utilization of salt lake resources, it should be said that the development and utilization of potassium resources in salt la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/10C01D15/08C01F5/24B01D11/04
CPCC01B35/1045C01F5/24C01D15/08B01D11/0492
Inventor 杨喜云伍玲龙徐徽王园园王小弟
Owner CENT SOUTH UNIV
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