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Method for preparing potassium chloride

A technology of potassium chloride and potassium chloride solution, which is applied in the direction of alkali metal chlorides, etc., can solve the problems of high energy consumption, low extraction rate of potassium chloride, and large water consumption, so as to improve the extraction rate, speed up the dissolution rate, The effect of reducing dosage

Inactive Publication Date: 2009-09-02
天津金环服科技发展有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For this reason, the technical problem to be solved by the present invention is: to overcome the shortcomings of large water consumption, high energy consumption, and low extraction rate of potassium chloride when preparing potassium chloride in the prior art, and provide a method with less water consumption and low energy consumption. , the method for preparing Potassium Chloride with high extraction rate of Potassium Chloride

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] a) Mix the electrostatic precipitator ash with potassium chloride weight percentage of 20wt% and potassium chloride saturated aqueous solution under normal temperature and pressure at a weight ratio of 5:1 to obtain a mixed solution, then add a hydrochloric acid aqueous solution with a volume concentration of 6%, adjust The pH value of the mixed solution is 7.

[0020] b) After fully stirring under the condition of heating, a potassium chloride solution and a filter residue are obtained through hot filtration under the condition of providing a positive pressure on the side of the mixed solution to be filtered. The filter residue is mixed with water, and after magnetic separation treatment, iron powder and remaining residue liquid are obtained, and the filter residue liquid is separated to obtain waste residue and waste residue water, and the waste residue water is used to prepare the hydrochloric acid solution. In this embodiment, high-frequency electromagnetic heating ...

Embodiment 2

[0027] a) Mix the electrostatic precipitator ash with potassium chloride weight percentage of 25wt% and potassium chloride saturated aqueous solution under normal temperature and pressure at a weight ratio of 4:1 to obtain a mixed solution, then add a hydrochloric acid aqueous solution with a volume concentration of 7%, adjust The pH value of the mixed solution is 6.

[0028] b) After fully stirring under the condition of heating, the potassium chloride solution and the filter residue are obtained through hot filtration under the condition of providing a negative pressure on the collecting side of the filtrate. The filter residue is mixed with water, and after magnetic separation treatment, iron powder and remaining residue liquid are obtained, and the filter residue liquid is separated to obtain waste residue and waste residue water, and the waste residue water is used to prepare the hydrochloric acid solution. In this embodiment, high-frequency electromagnetic heating is ado...

Embodiment 3

[0033] a) Mix the electrostatic precipitator ash with potassium chloride weight percentage of 10wt% and potassium chloride saturated aqueous solution under normal temperature and pressure at a weight ratio of 7:1 to obtain a mixed solution, and then add a hydrochloric acid aqueous solution with a volume concentration of 5% to adjust The pH value of the mixed solution is 8; at the same time, ethanol is added to the mixed solution, and the volume ratio of the saturated potassium chloride aqueous solution to the ethanol is 1500:1.

[0034] b) After fully stirring under the condition of heating, a potassium chloride solution and a filter residue are obtained through hot filtration under the condition of providing a positive pressure on the side of the mixed solution to be filtered. The filter residue is mixed with water, and after magnetic separation treatment, iron powder and remaining residue liquid are obtained, and the filter residue liquid is separated to obtain waste residue ...

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Abstract

The invention relates to a method for preparing potassium chloride, comprising the steps of mixing electric precipitation dust containing 10-25wt percent of potassium chloride with potassium chloride saturated aqueous solution in normal temperature and normal atmosphere at the weight ratio of 4-7:1, sufficiently stirring the mixture under a heating condition, obtaining potassium chloride solution and filter residue after thermal filtration, cooling and crystallizing the potassium chloride solution to obtain the finish product of potassium chloride. The method has the advantages of low water and energy consumption and high extraction yield of potassium chloride.

Description

technical field [0001] The invention relates to a method for preparing potassium chloride, in particular to a method for preparing potassium chloride by utilizing sintered electrostatic precipitator ash in iron and steel enterprises. Background technique [0002] The traditional potassium chloride preparation process is divided into two types, one is to extract potassium chloride from natural potassium ore, and the other is to extract potassium from bittern potassium or seawater, but these two preparation methods have complex processes and high operating costs. High defects, and with the increasing shortage of mineral resources and bittern potassium resources, the cost of raw materials is continuously increasing. At the same time, the traditional preparation process will cause environmental pollution and waste of energy. [0003] Chinese patent document CN101234766A discloses a method for producing potassium chloride by using sintered electrostatic precipitator ash in iron a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/04
Inventor 李金发
Owner 天津金环服科技发展有限公司
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