A method for comprehensive utilization of 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: 2015-12-09
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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  • A method for comprehensive utilization of potassium, boron and lithium in carbonate-type salt lake brine

Examples

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Comparison scheme
Effect test

Embodiment 1

[0026] A carbonate-type salt lake brine, its main composition is K2.93%, Na9.82%, CO 3 2- 2.27%, B 2 o 3 0.66%, Li0.07%.

[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 salt...

Embodiment 2

[0035] A carbonate-type salt lake brine, its main composition is K2.93%, Na9.82%, CO 3 2- 2.27%, B 2 o 3 0.66%, Li0.07%.

[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 chlo...

Embodiment 3

[0044] A carbonate-type salt lake brine, its main composition is K2.93%, Na9.82%, CO 3 2- 2.27%, B 2 o 3 0.66%, Li0.07%.

[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 sodium s...

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Abstract

The invention provides a method for comprehensive utilization of potassium, boron and lithium in carbonate-type salt lake brine. By introducing an acidification process, the type of brine is converted from carbonate type to chloride type, so that the composition of brine is simplified, thereby effectively solving the problem of Solved the technical problem of joint extraction of potassium, boron and lithium from carbonate-type salt lake brine. The method adopts an acidification process to adjust the pH value of the brine, and extracts boric acid from the acidified brine by solvent extraction; the raffinate enters the sodium salt pool, evaporates in the sun to precipitate sodium salt, and then enters the potassium salt pool to precipitate potassium mixed salt; it is purified by flotation Potassium chloride is produced from potassium mixed salt; lithium carbonate is extracted from the potassium-enriched mother liquor by precipitation method, and the old brine after lithium extraction is returned to the acidification pool 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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Patent Type & Authority Patents(China)
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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