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Method for producing high-quality crude potassium by using crude potassium oversize product

A high-quality, screen-over technology, applied in potash fertilizers, applications, inorganic fertilizers, etc., can solve the problems of crude potassium slurry product output decline, waste of resources, etc., and meet the requirements of broadening stringent requirements, avoiding waste of resources, and prolonging decomposition time Effect

Inactive Publication Date: 2018-09-28
ЦИНХАЙ СОЛТ ЛЕЙК ИНДАСТРИ ГРУП КО ЛТД
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to produce high-quality crude potassium by using the crude potassium oversize produced in the reverse flotation-cold crystallization production process, so as to solve the problem that the crude potassium oversize directly returns to the decomposition crystallizer to cause the grade drop of the crude potassium slurry to affect the product The quality even causes a sharp decline in product output, and the discharge of tail salt will cause a certain waste of resources. It also provides a method for the production of high-quality crude potassium by using low-grade carnallite

Method used

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  • Method for producing high-quality crude potassium by using crude potassium oversize product
  • Method for producing high-quality crude potassium by using crude potassium oversize product
  • Method for producing high-quality crude potassium by using crude potassium oversize product

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Effect test

Embodiment 1

[0045] Decomposing the fresh water addition in the crystallizer is 40-50% of the material quality on the coarse potassium sieve, and after decomposing and crystallizing the thick potassium slurry solid-liquid separation, obtain the low-grade thick potassium, and the described low-grade thick potassium is used for determining the composition, thereby Effects obtained by the method of the present invention will be described. The decomposed and crystallized crude potassium slurry is sieved with a 0.8 mm vibrating sieve for a second time. The oversize is waste salt, and the high-quality crude potassium slurry under the sieve is subjected to solid-liquid separation to obtain high-grade crude potassium. The component mass percentage composition of described crude potassium sieve material, low-grade crude potassium, high-grade crude potassium and waste salt is shown in Table 1:

[0046] Table 1:

[0047]

[0048]

[0049] Through the analysis of production data, the selection ...

Embodiment 2

[0051] Decomposing the fresh water addition in the crystallizer is 40-50% of the material quality on the coarse potassium sieve, and after decomposing and crystallizing the thick potassium slurry solid-liquid separation, obtain the low-grade thick potassium, and the described low-grade thick potassium is used for determining the composition, thereby Effects obtained by the method of the present invention will be described. The decomposed and crystallized crude potassium slurry is sieved with a 0.6mm vibrating sieve for a second time. The oversize is waste salt, and the high-quality crude potassium slurry under the sieve is subjected to solid-liquid separation to obtain high-grade crude potassium. The component mass percentage composition of described crude potassium sieve material, low-grade crude potassium, high-grade crude potassium and waste salt is shown in Table 2:

[0052] Table 2:

[0053] project

[0054] Through the analysis of production data, the selectio...

Embodiment 3

[0056] Decomposing the fresh water addition in the crystallizer is 40-50% of the material quality on the coarse potassium sieve, and after decomposing and crystallizing the thick potassium slurry solid-liquid separation, obtain the low-grade thick potassium, and the described low-grade thick potassium is used for determining the composition, thereby Effects obtained by the method of the present invention will be described. The decomposed and crystallized crude potassium slurry is sieved with a 0.8 mm vibrating sieve for a second time. The oversize is waste salt, and the high-quality crude potassium slurry under the sieve is subjected to solid-liquid separation to obtain high-grade crude potassium. The component mass percentage composition of described crude potassium sieve material, low-grade crude potassium, high-grade crude potassium and waste salt is shown in Table 3:

[0057] table 3:

[0058] project

[0059] Through the analysis of production data, the selecti...

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Abstract

The invention relates to a method for producing high-quality crude potassium by using a crude potassium oversize product. The method comprises the following steps: S1, preparing the crude potassium oversize product into a slurry; S2, mixing the slurry with fresh water, decomposing carnallite and crystallizing potassium chloride to obtain a crude potassium slurry; S3, screening the crude potassiumslurry to obtain an oversize product and an undersize product, wherein the oversize product is waste salt and the undersize product is a high-quality crude potassium slurry; S4, performing solid-liquid separation on the high-quality crude potassium slurry to obtain a solid phase of high-quality crude potassium and a liquid phase of decomposition mother liquor; and S5, discharging the decompositionmother liquor. The method provided by the invention solves the problems that the grade of crude potassium is reduced due to the direct return of the coarse potassium oversize product to a decomposition crystallizer, the product quality is then affected and even the product yield is greatly reduced, and the coarse potassium oversize product is discharged to a tail salt to cause a certain waste ofresources.

Description

technical field [0001] The invention belongs to the field of processing and production of salt minerals, and in particular relates to a method for recovering crude potassium oversize in a reverse flotation-cold crystallization potassium fertilizer production process for producing high-quality crude potassium. Background technique [0002] Potassium chloride is the largest category in the potash fertilizer market, 80% of which is used in agriculture. The main production methods are cold decomposition-positive flotation method, reverse flotation-cold crystallization method, hot melting method, and brine method, etc. The reverse flotation-cold crystallization method, as the most advanced process in the production of potassium chloride, has many advantages such as high yield, large particle size, and low energy consumption. Such as image 3 As shown, the main process flow is: the raw ore carnallite slurry is removed through the reverse flotation system to remove sodium chloride...

Claims

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Application Information

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IPC IPC(8): C05D1/04
CPCC05D1/04
Inventor 蒋中华袁建平任红伟郝红军莫维军王韧史忠录王玉梅石海燕马新东郭晓雯周强
Owner ЦИНХАЙ СОЛТ ЛЕЙК ИНДАСТРИ ГРУП КО ЛТД