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Method for joint extraction of potassium, boron and lithium from chloride-type potassium-containing underground brine

A combined extraction technology of underground brine, which is applied in lithium carbonate, chloride-type underground brine rich in potassium, boron, and lithium to extract potassium chloride and boric acid, can solve the problems of difficult industrial production, poor product quality, and inability to obtain potassium and boron. Separation and other issues, to achieve the effect of high resource utilization and simple process

Active Publication Date: 2015-09-30
ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the process of producing potassium salt and boric acid from brine is as follows: firstly inject brine into the evaporator for evaporative desodiumization, and then the boron-potassium mixed salt is produced after the de-sodiumized mother liquor continues to evaporate, and the boron-potassium mixed salt is separated by flotation Obtain potassium salt and boric acid, the shortcoming of prior art is that industrialized production is difficult to realize, and flotation process exists when floating potassium mother liquor and floating boron mother liquor can not be separated strictly, and the defective that potassium boron will not be separated, and product quality is poor

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  • Method for joint extraction of potassium, boron and lithium from chloride-type potassium-containing underground brine

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Embodiment 1

[0022] A chloride type underground brine, its composition is K 0.73%, Na 9.16%, Cl 16.82%, Ca 0.35%, B 2 o 3 0.20%, Li 0.005%. The brine is evaporated at 100°C, and the volume is concentrated by 3 times; the concentrated brine is ion-exchanged to extract boron, using D564 as the ion-exchange resin, the boron adsorption rate is 98.79%, when the resin reaches the working exchange capacity, stop adsorption and switch to desorption , the resin was rinsed with dilute sulfuric acid to obtain a boron-containing eluent, and the boron desorption rate was 99.5%. The eluent was concentrated by evaporation and cooled to crystallize to produce boric acid. Under the condition of stirring, add 380 g / L sodium sulfate solution to react, the amount of sodium sulfate is 110% of the theoretical amount, and the calcium salt based on calcium sulfate is precipitated; the mother liquor after calcium precipitation is evaporated for one stage, and the liquid density is controlled to be 1.32g / cm 3 ...

Embodiment 2

[0024] A chloride type underground brine, its composition is K 0.73%, Na 9.16%, Cl 16.82%, Ca 0.35%, B 2 o 3 0.20%, Li 0.005%. The brine is evaporated at 105°C, and the volume is concentrated by 4 times; the concentrated brine is ion-exchanged to extract boron, and D403 is used as the ion-exchange resin, and the boron adsorption rate is 85.40%. When the resin reaches the working exchange capacity, the adsorption is stopped and desorption , the resin was rinsed with dilute sulfuric acid to obtain a boron-containing eluate, and the boron desorption rate was 98.70%. The eluate was concentrated by evaporation and cooled to crystallize to produce boric acid. Under the condition of stirring, add 380 g / L sodium sulfate solution to react, the amount of sodium sulfate is 120% of the theoretical amount, and the calcium salt based on calcium sulfate is precipitated; the mother liquor after calcium precipitation is evaporated for one stage, and the liquid density is controlled to be 1.3...

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Abstract

The invention provides a method for jointly extracting potassium, boron and lithium from chloride-type potassium-containing underground brine, in which sodium chloride is precipitated by evaporation process to enrich the brine; after concentration to a certain multiple, boric acid is extracted by ion exchange method; Precipitate calcium to eliminate the influence of calcium on the subsequent lithium extraction process; the mother liquor of calcium precipitation is evaporated at high temperature to precipitate sodium salt, and the mother liquor of potassium precipitation is crystallized to precipitate potassium salt; The evaporation stage is recycled. In the present invention, sodium chloride is precipitated by evaporation in the early stage, so that potassium, boron, and lithium are enriched and concentrated, and boric acid is separated and extracted by an ion exchange method, which effectively solves the technical problem that it is difficult to effectively separate boron and potassium under the coexistence of high concentrations of boron and potassium in underground brine. .

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of brine resources, and in particular relates to a method for extracting potassium chloride, boric acid and lithium carbonate from chloride-type underground brine rich in potassium, boron and lithium. Background technique [0002] my country is a country poor in soluble solid potassium salt ores. In addition to salt lake resources, the existing potassium resources also have abundant underground brine resources in Hubei, Sichuan and Qinghai. In addition to being rich in potassium, the brine resource also contains sodium, boron, magnesium, calcium, lithium and various trace elements with development value. To economically develop the brine resources, only by adopting high-efficiency and energy-saving technologies, comprehensively utilizing the chemical resources in the brine, and reducing the comprehensive energy consumption of the product, can the produced potassium chloride be competitive....

Claims

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Application Information

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IPC IPC(8): C01D3/06C01B35/10C01D15/08C01F11/46
Inventor 谭秀民张秀峰张利珍李琦赵恒勤
Owner ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD