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Method for improving grade of potassium chloride and application

A potassium chloride and grade technology, which is applied in the field of separation and purification, can solve the problems of high stability of raw ore properties, lower potassium chloride grade, strict operating conditions, etc., and achieve a simple and feasible regulation method, good regulation and low cost Effect

Pending Publication Date: 2022-08-02
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the production practice has proved that the "cold decomposition-positive flotation" process has strict operating conditions and has high requirements for the stability of raw ore properties.
When the raw ore is fine-grained high-sodium carnallite, it is found that there is adhesion or intercalation between the potassium chloride and sodium chloride crystals precipitated after decomposition, and it is difficult to separate the two by flotation alone, so that the concentrate Potassium chloride grade dropped seriously

Method used

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  • Method for improving grade of potassium chloride and application

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preparation example Construction

[0021] In some preferred embodiments, the preparation method includes: dissolving a regulator in a saturated mother liquor to form a first mixed solution, and then slowly adding carnallite and water to the first mixed solution for decomposition treatment to obtain an intermediate product.

[0022] In the present invention, the mode of adding the regulator can be solid added or added as a solution.

[0023] In the present invention, the addition of the regulating agent is not limited to the saturated mother liquor, and can also be added to fresh water or other substitute fresh water.

[0024] Further, the time of the decomposition treatment is 10-20 min, and the temperature is 15-25°C.

[0025] Further, the preparation method further includes: after the decomposition treatment is completed, the obtained mixture is allowed to stand for 10-20 minutes.

[0026] In some preferred embodiments, the carnallite includes sodium-containing carnallite.

[0027] Further, the carnallite i...

Embodiment 1

[0043] 330 mL of saturated mother liquor required for the configuration and decomposition of carnallite (saturated mother liquor includes the following components calculated by mass percentage: KCl 3.0wt%, NaCl 0.05wt%, MgCl 2 26.0wt%, H 2 O 70.95wt%. ), then weigh 0.35 g of 1# regulator (composed of polyethylene glycol-800 and polyacrylamide 1:1), add it to the saturated mother liquor and stir well until it is completely dissolved. Continue stirring, control the feeding speed, add 500 g of sodium-containing carnallite (sodium chloride content of 30%) and a certain amount of fresh water synchronously and slowly to the saturated mother liquor to decompose at 20° C. The decomposition time is 10 min. After the decomposition is completed, continue to balance for 10 minutes, for a total of 20 minutes. Then the wet material is transferred to the flotation cell for flotation. After roughing, sweeping and beneficiation, the potassium chloride grade in the obtained concentrate is inc...

Embodiment 2

[0045] Prepare 330 mL of saturated mother liquor required for decomposing carnallite, then weigh 0.32 g of 2# regulator (polyethylene glycol-800), add it to the saturated mother liquor and fully stir until completely dissolved. Continue stirring, control the feeding speed, add 500 g of sodium-containing carnallite (sodium chloride content is 30%) and a certain amount of fresh water synchronously and slowly to the saturated mother liquor to decompose at 20° C. The decomposition time is 15min. After the decomposition is completed, continue to equilibrate for 15 minutes, for a total of 30 minutes. Then the wet material is transferred to the flotation cell for flotation. After roughing, sweeping and beneficiation, the potassium chloride grade in the obtained concentrate is increased from 80.73% before adding the regulator to 88.55%.

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Abstract

The invention discloses a method for improving the grade of potassium chloride and application. The method comprises the steps that a mixed reaction system containing carnallite, a regulating agent, saturated mother liquor and water is subjected to decomposition, flotation and separation treatment, and potassium chloride concentrate is prepared; wherein the regulating agent comprises any one or a combination of more than two of polyacrylamide, sodium dodecyl benzene sulfonate, polyethylene glycol, a polyethylene glycol derivative, sodium lauryl sulfate, lauryl sodium sulfate, polysorbate and fatty glyceride. The regulation and control method is simple, feasible and convenient to implement, a fine-grained high-sodium carnallite system with poor raw ore quality can be well regulated and controlled, and the grade of potassium chloride in the concentrate can be remarkably improved; and meanwhile, the regulating agent in the method is small in adding amount, free of pollution and low in cost, and the subsequent flotation process is not affected.

Description

technical field [0001] The invention belongs to the technical field of separation and purification, and in particular relates to a method and application for improving the grade of potassium chloride. Background technique [0002] Potash fertilizer is the basic fertilizer for agricultural production in my country and an important guarantee for national agricultural production and grain production. However, my country's potash mine resources are scarce and large-scale soluble solid potash deposits are lacking. Among the proven potash mine reserves in the country, 95% of the reserves come from salt lake liquid deposits. The existing potash fertilizer production is mainly based on salt lake brine as raw material, and the carnallite ore is obtained by crystallization and crystallization in the salt field, and then the carnallite is screened, decomposed and flotated to obtain potassium chloride product. However, in the process of crystallizing carnallite in the salt lake brine, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/08C01D3/14C05D1/02
CPCC01D3/08C01D3/14C05D1/02C01P2006/80Y02A40/20
Inventor 付振海俞学山李成宝张志宏唐海英张世春苏彤李志伟
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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