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Preparation technique of high-purity potassium chloride

A preparation process and technology of potassium chloride, applied in the direction of alkali metal halide purification, etc., can solve the problems of potassium chloride crystal particle size control, relatively strict crystal particle requirements, unreachable amine substances, etc., and achieve low production cost. , The effect of small process loss and simple equipment

Active Publication Date: 2015-07-01
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the production processes adopt the hot-melt crystallization process, such as the process disclosed in CN102241408 A, which uses the difference in the solubility of impurity ions and potassium chloride to remove impurities, but the effect is not ideal, and a large amount of water needs to be consumed for evaporating a large amount of water. Energy; CN101683987A discloses that the KCl supersaturated mother liquor obtained by thermal melting is cooled to below zero for cooling and crystallization to obtain high-purity potassium chloride. Then through the second effect decompression evaporation crystallization, high-purity potassium chloride product is obtained, but the crystal particle size of potassium chloride is not controlled; CN102874847A discloses the scheme, is to utilize saturated potassium chloride slurry to add potassium chloride crystal A kind of method, forms thick slurry, then the method of cooling crystallization, obtains high-purity potassium chloride product, and the crystal particle of 0.5 mm or more in the potassium chloride product obtained by this process accounts for more than 80%, but needs to add a large amount of potassium chloride Seed crystals, and the requirements for crystal particles are more stringent
At present, agricultural-grade potassium chloride is mostly directly obtained by flotation, and amines are mostly used as flotation agents in the flotation method. Therefore, the amines in agricultural-grade potassium chloride are far from food-grade and Pharmaceutical grade requirements, but few technologies describe how to remove such substances

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Add a hydrochloric acid solution with a mass concentration of 10wt% in a mass ratio of 1:0.3 to agricultural potassium chloride (KCl content is 95wt%), stir for 0.5h, perform solid-liquid separation, and discard the liquid phase; (2 ) into the solid phase obtained in step (1) by adding a KOH solution with a mass concentration of 3wt% in a mass ratio of 1:1, heating to 80°C for dissolution, and filtering with heat preservation to obtain a high-temperature supersaturated potassium chloride mother liquor; (3) in Add the sodium hexametaphosphate solution with a mass concentration of 5wt% in the obtained high-temperature supersaturated potassium chloride mother liquor in step (2) according to a mass ratio of 100:2 as a dispersing agent, stir at a speed of 30 r / min until the mother liquor is cooled to room temperature, Obtain potassium chloride slurry; (4) adopt potassium chloride saturated mother liquor to adjust the mass percentage of potassium chloride crystals in step ...

Embodiment 2

[0033] (1) Add a hydrochloric acid solution with a mass concentration of 20wt% to agricultural potassium chloride (95wt% KCl content) at a mass ratio of 1:0.4, stir for 1 hour, separate the solid from the liquid, and discard the liquid phase; (2) Add a KOH solution with a mass concentration of 1wt% to the solid phase obtained in step (1) in a mass ratio of 1:0.5, heat to 80°C for dissolution, heat-preserve and filter to obtain a high-temperature supersaturated potassium chloride mother liquor; (3) in step (2) In the obtained high-temperature supersaturated potassium chloride mother liquor, add a sodium hexametaphosphate solution with a mass concentration of 2wt% in a mass ratio of 100:0.5 as a dispersing agent, stir at a speed of 60 r / min until the mother liquor is cooled to room temperature, and obtain Potassium chloride slurry; (4) adjust the mass percentage of potassium chloride crystals in the potassium chloride slurry obtained in step (3) to 5% by using saturated mother li...

Embodiment 3

[0035](1) Add a hydrochloric acid solution with a mass concentration of 35wt% to agricultural potassium chloride (90wt% KCl content) at a mass ratio of 1:0.5, stir for 2 hours, separate the solid from the liquid, and discard the liquid phase; (2) Add a KOH solution with a mass concentration of 4wt% to the solid phase obtained in step (1) in a mass ratio of 1:1.5, heat to 100°C for dissolution, heat-preserve and filter to obtain a high-temperature supersaturated potassium chloride mother liquor; (3) in step (2) In the obtained high-temperature supersaturated potassium chloride mother liquor, add a sodium hexametaphosphate solution with a mass concentration of 8wt% in a mass ratio of 100:3 as a dispersing agent, stir at a speed of 120r / min until the mother liquor is cooled to room temperature, and obtain Potassium chloride slurry; (4) adjust the mass percentage of potassium chloride crystals in the potassium chloride slurry obtained in step (3) to 30% by using saturated mother li...

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PUM

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Abstract

The invention relates to a preparation technique of high-purity potassium chloride, which comprises the following steps: (1) adding a hydrochloric acid solution into agricultural potassium chloride, stirring, and carrying out solid-liquid separation; (2) adding a KOH solution into the solid phase, dissolving by heating, keeping the temperature, and filtering to obtain a high-temperature oversaturated potassium chloride mother solution; (3) adding a sodium hexametaphosphate solution into the high-temperature oversaturated potassium chloride mother solution, and stirring until the mother solution is cooled to room temperature, thereby obtaining a potassium chloride slurry; and regulating the mass percent of the potassium chloride crystal in the potassium chloride slurry, carrying out cyclone grading, and drying the obtained potassium chloride coarse crystal to obtain the high-purity potassium chloride. The technique has the advantages of energy saving, consumption reduction, short technical process, simple equipment, low investment, high product purity (at least 99.5%), high potassium chloride yield (at least 95.5%) and favorable potassium chloride crystallinity. The potassium chloride with the particle size of 1mm above accounts for 70 wt% of the total potassium chloride, and the impurity content is lower than 0.3%; and thus, the potassium chloride satisfies the requirements in GB25585-2010.

Description

technical field [0001] The invention relates to a preparation process of inorganic salts, in particular to a process for preparing high-purity potassium chloride by using agricultural potassium chloride. Background technique [0002] High-purity potassium chloride is an important raw material for medicine and food additives, and is also a raw material for the manufacture of high-purity potassium hydroxide, potassium sulfate, potassium nitrate and potassium chlorate. As one of the main components of low-sodium salt, the dosage is huge. Low-sodium salt is a new generation of edible salt with health care effects. Long-term consumption is beneficial to the balance of sodium, potassium, magnesium and other ions in the human body, and has obvious effects on preventing high blood pressure. Effect. [0003] At present, most of the high-purity potassium chloride that can be used in food and pharmaceutical grades in my country is obtained by removing impurities from agricultural pota...

Claims

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Application Information

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IPC IPC(8): C01D3/14
Inventor 谢超高文远汤建良郑贤福
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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