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
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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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