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Method for comprehensively utilizing potassium, boron and lithium in carbonate type salt lake brine

A carbonate type, salt lake brine technology, applied in lithium carbonate;/acid carbonate, boron oxide, alkali metal halide purification and other directions, can solve the problem of comprehensive utilization and reduce lithium extraction efficiency , limit the large-scale extraction of lithium, etc., to achieve the effect of good product quality, simple process and high resource utilization rate

Active Publication Date: 2014-01-15
ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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Problems solved by technology

[0004] Although the above method can extract lithium resources simply and greenly, there are two deficiencies: one is that the solubility of lithium carbonate is low, and the existence of carbonate radicals in carbonate-type brine limits the concentration and enrichment of lithium ions, thus limiting the concentration and concentration of lithium ions in brine. The large-scale extraction of lithium in the medium reduces the extraction efficiency of lithium; the second is that it is impossible to talk about the comprehensive utilization of the valuable elements potassium and boron in carbonate salt lakes

Method used

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  • Method for comprehensively utilizing potassium, boron and lithium in carbonate type salt lake brine

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A carbonate-type salt lake brine, its main composition is K 2.93%, Na 9.82%, CO 3 2- 2.27%, B 2 o 3 0.66%, Li 0.07%.

[0027] (1) In the acidification pool, add hydrochloric acid to the original brine to cause a neutralization reaction, and adjust the pH of the brine to 2.0;

[0028] (2) Extract the acidified brine. Under the extraction conditions of 2-ethyl-1,3-ethanediol concentration of 15% and isooctyl alcohol concentration of 35%, the extraction rate is 96.32%. Under the condition of 0.625mol / L, the stripping rate is 98.50%. The stripping liquid is evaporated and concentrated 10 times, and boric acid is precipitated by acidification. After filtering, washing and drying, the boric acid product is obtained. The yield of boric acid is 90.90%, and the recovery rate of boron is 86.24%;

[0029] (3) The raffinate is introduced into the sodium salt pool, and concentrated by solar evaporation to a density of 1.296g / cm 3 , to precipitate sodium chloride-based sodium...

Embodiment 2

[0035] A carbonate-type salt lake brine, its main composition is K 2.93%, Na 9.82%, CO 3 2- 2.27%, B 2 o 3 0.66%, Li 0.07%.

[0036] (1) In the acidification pool, add hydrochloric acid to the original brine to cause a neutralization reaction, and adjust the pH of the brine to 4.6;

[0037] (2) Extract the acidified brine. Under the extraction condition of 2-ethyl-1,3-ethanediol concentration of 50%, the extraction rate is 97.27%. Under the condition of NaOH concentration of 0.50mol / L , the stripping rate was 97.54%, the stripping solution was evaporated and concentrated by 8.2 times, and boric acid was precipitated by acidification, and the boric acid product was obtained after filtration, washing and drying. The yield of boric acid was 87.92%, and the boron recovery rate was 83.41%;

[0038] (3) The raffinate is introduced into the sodium salt pool, and concentrated by solar evaporation to a density of 1.309g / cm 3 , to precipitate sodium salt mainly composed of sodium...

Embodiment 3

[0044] A carbonate-type salt lake brine, its main composition is K 2.93%, Na 9.82%, CO 3 2- 2.27%, B 2 o 3 0.66%, Li 0.07%.

[0045] (1) In the acidification pool, add hydrochloric acid to the original brine, a neutralization reaction occurs, and the brine pH value is adjusted to 5.4;

[0046] (2) Extract the acidified brine. Under the extraction condition of 2-ethyl-1,3-ethanediol concentration of 30%, the extraction rate is 98.32%. Under the condition of NaOH concentration of 1.0mol / L , the stripping rate is 99.50%, the stripping solution is evaporated and concentrated 13 times, acidified and precipitated to produce boric acid, and the boric acid product is obtained by filtering, washing and drying, and the recovery rate of boron is 83.1%;

[0047] (3) The raffinate is introduced into the sodium salt pool, evaporated by the sun and concentrated to a density of 1.310g / cm 3 , to precipitate sodium chloride-based sodium salt;

[0048] (4) The mother liquor after the sod...

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Abstract

The invention provides a method for comprehensively utilizing potassium, boron and lithium in carbonate type salt lake brine. The brine type is converted from the carbonate type into the chloride type through introducing the acidification technology, so that the brine composition is simplified, and further the technical problem of combined extraction of potassium, boron and lithium from the carbonate type salt lake brine is solved. According to the method, the acidification technology is adopted to regulate the pH value of the brine, and the solvent extraction method is adopted to extract boric acid from the acidified brine; raffinate enters a sodium salt pond, then is subjected to solarization and evaporation to separate out sodium salt, and gets into a potassium salt pond to separate out potassium mixed salt; the potassium mixed salt is purified to prepare potassium chloride by adopting the flotation method; the precipitation method is adopted to extract lithium carbonate from the potassium separated mother liquor with enrichment of lithium; old brine subjected to lithium extraction is returned to the acidification pond for recycling.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of salt lake brine resources, in particular to a method for extracting potassium chloride, boric acid and lithium carbonate from carbonate-type salt lake brine rich in potassium, boron and lithium. Background technique [0002] my country's Tibet is rich in carbonate-type salt lake resources, such as Bangor Co, Dangxiong Co, Zabuye Chaka, Guojialin Co and other carbonate-type salt lakes. Carbonate-type salt lakes are rich in inorganic salt-forming elements such as sodium, potassium, boron, lithium, chlorine, sulfate, and carbonate. The content of calcium and magnesium in carbonate-type salt lakes is extremely low, and there is no difficulty in the separation of magnesium and lithium in brines with high magnesium-lithium ratios, which is very conducive to the extraction of lithium carbonate. Therefore, carbonate-type salt lakes are high-quality resources for lithium extraction from brines ...

Claims

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Application Information

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IPC IPC(8): C01B35/10C01D3/06C01D3/14C01D15/08
Inventor 谭秀民张秀峰张利珍李琦赵恒勤黄维农康红林仁青罗布洛布占堆
Owner ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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