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Method for preparing potassium chloride through decomposing carnallite by concentrated brine

A technology of carnallite and potassium chloride, which is applied in the direction of alkali metal chlorides, can solve the problems of high energy consumption, large investment, and low efficiency, and achieve the effects of improving economic efficiency, solving large evaporation, and reducing costs

Active Publication Date: 2012-07-18
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for producing potassium chloride by decomposing carnallite with concentrated brine, which is a method of decomposing carnallite with concentrated brine without adding brine and adding water , the raw material bittern is made into concentrated brine, and then the concentrated brine and carnallite are thermally dissolved and decomposed, and the resulting liquid is cooled to obtain potassium chloride products, which overcomes the existing process of producing potassium chloride by the method of bittern mixed with bittern, including There are multiple processes of brine, evaporation, cooling, decomposition and washing, which have the disadvantages of high energy consumption, large investment and low benefit

Method used

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  • Method for preparing potassium chloride through decomposing carnallite by concentrated brine
  • Method for preparing potassium chloride through decomposing carnallite by concentrated brine
  • Method for preparing potassium chloride through decomposing carnallite by concentrated brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The first step is to obtain concentrated bittern from the raw bittern through concentration

[0027] Put 2800 g of bittern as a raw material in an evaporator, evaporate and concentrate until the boiling temperature of the feed liquid in the evaporator is 123° C., keep warm at 118° C., and remove the precipitated sodium chloride through solid-liquid separation to obtain 1150 g of concentrated bittern;

[0028] The second step is to prepare concentrated brine from concentrated bittern

[0029] The concentrated bittern obtained in the first step is heated up to a temperature of 140°C in an autoclave with a pressure of 0.2MPa, then cooled to 120°C, and the precipitated magnesium sulfate is removed through solid-liquid separation to obtain 1138g of concentrated bittern. In the obtained concentrated bittern The magnesium sulfate content is 2.2%;

[0030] The third step is to decompose carnallite with concentrated brine to prepare potassium chloride

[0031] The concentrated...

Embodiment 2

[0038] The first step is to obtain concentrated bittern from the raw bittern through concentration

[0039] Put 2800 g of raw bittern in an evaporator, evaporate and concentrate until the boiling point temperature of the liquid in the evaporator is 119°C, keep warm at 118°C, and remove the precipitated sodium chloride through solid-liquid separation to obtain 1150g of concentrated bittern;

[0040] The second step is to prepare concentrated brine from concentrated bittern

[0041] The concentrated bittern obtained in the first step is heated up to a temperature of 250°C in an autoclave with a pressure of 0.8MPa, then cooled to 120°C, and the precipitated magnesium sulfate is removed through solid-liquid separation to obtain 1131g of concentrated bittern. In the obtained concentrated bittern The magnesium sulfate content is 2.0%;

[0042] The third step is to decompose carnallite from concentrated brine to produce potassium chloride

[0043] The concentrated brine prepared in...

Embodiment 3

[0048] The first step is to obtain concentrated bittern from the raw bittern through concentration

[0049] 2800g of the bittern raw material was evaporated and concentrated by an evaporator until the temperature of the liquid in the evaporator was 126°C, kept at 120°C, and the precipitated sodium chloride was removed through solid-liquid separation to obtain 1150g of concentrated bittern;

[0050] The second step is to obtain concentrated brine from concentrated bittern

[0051] The concentrated bittern obtained in the first step is heated to a temperature of 270 ° C in an autoclave with a pressure of 0.85 MPa, then cooled to 120 ° C, and then the magnesium sulfate precipitated is removed through solid-liquid separation to obtain 1130 g of concentrated bittern, and the obtained concentrated bittern is The magnesium sulfate content is 1.9%;

[0052] The third step is to decompose carnallite from concentrated brine to produce potassium chloride

[0053] The concentrated brine o...

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Abstract

The invention relates to a method for preparing potassium chloride through decomposing carnallite by concentrated brine, and relates to a method for preparing the potassium chloride by utilizing acrid bittern after sea salt production. The comprises the following steps of: evaporating and concentrating the raw material acrid bittern, and carrying out solid-liquid separation to remove sodium chloride so as to obtain filter liquor concentrated acrid bittern; heating the concentrated acrid bittern to separate out sulfate or removing sulfate through chemical precipitation so as to obtain the concentrated brine; after hotly dissolving and decomposing the concentrated brine and the carnallite, separating and re-refining to obtain a potassium chloride product; after evaporating and concentratingthe decomposed solution, separating to obtain sodium chloride; after cooling and crystallizing mother solution, separating to obtain the carnallite and thick brine; taking the obtained carnallite as a raw material to be used repeatedly; and using the thick brine for preparing magnesium chloride. According to the method, brine has no need to be mixed, and water has no need to be added, so that theproblem of thick brine idling in an existing brine mixing process is avoided, the loss of heat and materials in a heating process and a cooling process is reduced, the problem of large evaporation capacity caused by hydrolytic decomposition of the carnallite is also solved, and the defects of high energy consumption, large investment and low efficiency existing in an existing potassium chloride production process through a acrid bittern brine mixing method are overcome.

Description

technical field [0001] The technical scheme of the present invention relates to preparing potassium chloride with bittern after producing sea salt, specifically a method for preparing potassium chloride by decomposing carnallite with concentrated brine. Background technique [0002] Potassium chloride is an important chemical raw material and a high-quality potassium fertilizer. my country is a large agricultural country and the country with the largest potash fertilizer consumption, accounting for about 20% of the world's potash fertilizer consumption. The source of potassium chloride mainly depends on imports. [0003] The present methods for producing potassium chloride mainly include bittern bittern and bittern, reverse flotation-cold crystallization of carnallite, cold decomposition flotation of carnallite, flotation of potassium halite and direct extraction of potassium from seawater. Among them, the technology of producing potassium chloride by adding bittern to bitt...

Claims

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Application Information

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IPC IPC(8): C01D3/06
Inventor 王军袁俊生李洪纪志永杨超鹏
Owner HEBEI UNIV OF TECH
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