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Method for producing industrial potassium chloride through hot melting crystallization of underground embedded solid potassium salt mine

A potassium chloride and potassium salt mine technology, applied in the direction of alkali metal chloride and the like, can solve the problems of lack of large soluble solid potassium salt deposits, weak potassium chloride technology, etc. Effect

Active Publication Date: 2014-12-17
YUNNAN CHEM RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In view of the fact that 95% of the proven potassium salt reserves in my country come from Quaternary salt lake brine deposits, and there is a lack of large soluble solid potassium salt deposits, the domestic technology of using ancient solid potassium salt resources to produce potassium chloride is relatively weak

Method used

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  • Method for producing industrial potassium chloride through hot melting crystallization of underground embedded solid potassium salt mine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Raw ore (KCl: 13.89% NaCl: 49.23% MgCl 2 : 15.50%H 2 O: 21.38%) is crushed by a hammer crusher until the particle size is less than 10mm, 1000g of raw ore is taken, and 428.09g of circulating potassium mother liquor is added to decompose in the decomposition tank. The decomposition reaction time is 15 minutes at room temperature, and 1428.09g of slurry is obtained. ;

[0024] (2) Slurry is subjected to wet sieving, Taylor standard sieve mesh is 16 meshes, and 470.07g of large-particle solid phase sodium chloride oversize and mixed slurry undersize with solid phase potassium chloride are obtained. Sodium chloride was directly backfilled downhole, and the underscreen was separated from solid and liquid by suction filtration to obtain 337.06g of crude potassium mineral and 620.96g of decomposed mother liquor;

[0025] (3) Add 573.02g of circulating potassium mother liquor, 239.74g of water and 30.86g of washing water to the crude potassium mineral, heat-dissolve at 9...

Embodiment 2

[0028] (1) Raw ore (KCl: 13.73% NaCl: 49.50% MgCl 2 : 15.40%H 2 O: 21.37%) was crushed by a hammer crusher until the particle size was less than 10mm, 1000g of raw material ore was taken, and 434.78g of circulating potassium mother liquor was added to decompose in the decomposition tank. The decomposition reaction time at room temperature was 30 minutes, and 1434.78g of slurry was obtained;

[0029] (2) The slurry is wet screened, and the Taylor standard sieve mesh is 35 meshes, and 540.24g of large-particle solid phase sodium chloride oversize and mixed slurry undersize with solid phase potassium chloride are obtained. Sodium chloride was directly backfilled downhole, and the underscreen was separated from solid and liquid by suction filtration to obtain 280.78g of crude potassium mineral and 613.77g of decomposed mother liquor;

[0030] (3) Add 605.86g of circulating potassium mother liquor, 244.20g of water and 28.68g of washing water to the crude potassium mineral, heat-d...

Embodiment 3

[0033] (1) Raw ore (KCl: 17.94% NaCl: 36.26% MgCl 2 : 20.52%H 2 O: 25.28%) is crushed by a hammer crusher until the particle size is less than 10mm, 1000g of raw ore is taken, and 416.66g of circulating potassium mother liquor is added to decompose in the decomposition tank. The decomposition reaction time is 45 minutes at room temperature, and 1416.66g of slurry is obtained. ;

[0034] (2) The slurry is wet screened, and the Taylor standard sieve mesh is 20 meshes, and 371.81g of large-particle solid phase sodium chloride oversize and mixed slurry undersize with solid phase potassium chloride are obtained. Sodium chloride was directly backfilled downhole, and the underscreen was separated from solid and liquid by suction filtration to obtain 278.13g of crude potassium mineral and 766.72g of decomposed mother liquor;

[0035](3) Add 623.01g of circulating potassium mother liquor, 271.56g of water and 32.16g of washing water to the crude potassium mineral, heat-dissolve at 10...

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Abstract

The invention belongs to the field of chemical industry mineral processing, and particularly relates to a method for producing industrial potassium chloride through hot melting crystallization of underground embedded solid potassium salt mine. The method comprises: crushing underground embedded solid potassium salt mine to achieve a particle size of less than 10 mm; adding a circulation potassium mother liquor to decompose the potassium salt mine; screening the obtained decomposed slurry, wherein the material on a sieve is large particle sodium chloride and is thrown out; carrying out solid-liquid separation on the material under the sieve to obtain a potassium chloride-containing crude potassium mineral; adding the circulation potassium mother liquor and water to carry out hot melting, and carrying out thermal insulation filtration on the hot melting slurry to remove solid phase sodium chloride; and carrying out circulation cooling on the hot melting liquid, crystallizing to obtain large particle potassium chloride, and carrying out solid-liquid separation, washing and drying to obtain the industrial grade potassium chloride. According to the present invention, based on the decomposition grading characteristic of the underground embedded solid potassium salt mine, the hot melting crystallization method is adopted to produce the industrial potassium chloride, and advantages of reliable technology, stable process, high product purity, large particle size, high potassium yield, and no pollutant emission are provided.

Description

technical field [0001] The invention belongs to the field of inorganic salt industry, and in particular relates to a method for producing industrial potassium chloride by thermally dissolving and crystallizing underground buried solid potassium salt ore. Background technique [0002] Potassium salt resources are seriously scarce in my country, and the proven geological reserves are about 1 billion tons. my country is a large agricultural country, with a basic demand for potash fertilizer of about 7 million tons. It is the second largest consumer and the second largest importer in the world. Agriculture is the foundation of my country's national economic and social development. In order to ensure the sustainable development of my country's modern agriculture and food security in the 21st century, it is necessary to ensure the stable supply of nitrogen, phosphorus, and potassium fertilizers, especially potassium fertilizers, and it is necessary to implement "going out" This is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/08
Inventor 曾波王国栋李骥乐有贵
Owner YUNNAN CHEM RES INST
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