Method for producing potassium chloride by adopting carnallite hot-melt brine

A technology of carnallite and potassium chloride, applied in the direction of alkali metal chloride, etc., can solve the problems of increasing energy consumption, difficulty in meeting market demand, high energy consumption, etc., and achieve the effect of reducing energy consumption

Active Publication Date: 2013-07-10
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at mining brine in underground carnallite mines, Chinese patent application 201110433253.4 discloses a method for producing potassium chloride, sodium chloride and magnesium flakes by using brine in carnallite mines. Although this method can comprehensively utilize carnallite mines to a certain extent Useful ingredients in brine mining in stone mines, but this method can only obtain one level of KCl products, which is difficult to meet market demand in specific areas
At the

Method used

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Effect test

Embodiment 1

[0016] This embodiment includes the following steps:

[0017] (1) Evaporation and crystallization of carnallite: send the filtrate of the fine crystal slurry and the original halogen from step (5) into the evaporator according to the mass ratio of filtrate:original halogen=1:0.5, and send the raw material into the evaporator for the initial production The brine obtained by directly dissolving the carnallite ore extracted from the mine with fresh water is preheated to 137°C for evaporation and concentration. When the boiling point of the liquid in the evaporation chamber rises to 25°C, the material is discharged, and the evaporated mother liquid is discharged to the carnallite for cooling and crystallization. The end temperature of the cooling crystallization is 40°C. The slurry in the cooling crystallizer is sent to the thickener A. The overflow part of the thickener A is the old brine. The bottom flow of the thickener A is filtered and separated, and the obtained filter cake i...

Embodiment 2

[0023] This embodiment includes the following steps:

[0024] (1) Evaporation and crystallization of carnallite: send the filtrate of the fine crystal slurry and the original halogen from step (5) into the evaporator according to the mass ratio of filtrate:original halogen=1:0.55, and send the raw material into the evaporator for the initial production The brine obtained by directly dissolving the carnallite ore extracted from the mine with fresh water is preheated to 140°C for evaporation and concentration, when the boiling point of the material liquid in the evaporation chamber rises to 26°C, the material is discharged, and the evaporated mother liquid is discharged to the carnallite for cooling and crystallization The end temperature of the cooling crystallization is 36°C. The slurry in the cooling crystallizer is sent to the thickener A. The overflow part of the thickener A is the old brine. The bottom flow of the thickener A is filtered and separated, and the obtained filt...

Embodiment 3

[0030] This embodiment includes the following steps:

[0031] (1) Evaporation and crystallization of carnallite: send the filtrate of the fine crystal slurry and the original halogen from step (5) into the evaporator according to the mass ratio of filtrate:original halogen=1:0.56, and send the raw material into the evaporator for the initial production The brine obtained by directly dissolving the carnallite ore extracted from the mine with fresh water is preheated to 142°C for evaporation and concentration, when the boiling point of the material liquid in the evaporation chamber rises to 25°C, the material is discharged, and the evaporated mother liquid is discharged to the carnallite for cooling and crystallization The end temperature of the cooling crystallization is 41°C. The slurry in the cooling crystallizer is sent to the thickener A. The overflow part of the thickener A is the old brine. The bottom flow of the thickener A is filtered and separated, and the obtained filt...

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Abstract

The invention discloses a method for producing potassium chloride by adopting carnallite hot-melt brine. The method disclosed by the invention comprises the following steps of: (1) evaporating and crystallizing carnallite; (2) preparing a well mining injection agent and mining; (3) decomposing and crystallizing; (4) preparing agricultural-grade KCl; and (5) preparing industrial-grade KCl. According to the method, based on the decomposing and crystallizing characteristics of carnallite, KCl with thick crystal particles and KCl with thin crystal particles are processed by adopting different processes, so that the agricultural-grade and industrial-grade KCl products are obtained and the diversification of the products is realized; the process provided by the invention is low in overall energy consumption; by adopting the way of dissolving ores with a thermal injection agent, the mining rates of sodium chloride and magnesium chloride are greatly reduced during production of potassium chloride, so that the method disclosed by the invention has the advantages of saving production cost and achieving good comprehensive benefits.

Description

technical field [0001] The invention relates to a method for producing potassium chloride by using carnallite hot-dissolved brine, in particular to a method for producing different grades of potassium chloride by using underground carnallite mine hot-dissolved brine. Background technique [0002] At present, the production of potassium chloride fertilizer mainly uses soluble potassium salt ore carnallite as raw material. The main production methods for producing potassium chloride from carnallite ore in China are: cold decomposition-flotation method, cold decomposition-hot melt crystallization method, reverse flotation-cold crystallization method, and rate-controlled decomposition method for desodiumization with halogen, etc. Carnallite ores from salt lakes are generally mined in the open pit or from beach-dried salt fields, and the above methods are more suitable for preparing potassium chloride. For deep underground carnallite mines, the cost of open-pit mining is too hig...

Claims

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Application Information

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IPC IPC(8): C01D3/08
Inventor 冯跃华戴斌联刘小力陈伟来杨能红潘友明孙成高
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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