A preparation method for flame-retardant potassium dihydrogen phosphate granules
A technology of potassium dihydrogen phosphate and granules, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problem that evaporation crystallization does not meet the requirements of environmental protection, and the neutralization method cannot meet the requirements of flame retardant product quality, etc. problems, to achieve the effect of suppressing side reactions and the generation of impurities, ensuring particle size and fluidity, and facilitating industrial scale production
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Embodiment 1
[0081] 1) Put 12.2kg of purified industrial-grade wet-process phosphoric acid with a mass fraction of 85% in an aeration storage tank with an air inlet pipe installed on the top, and use compressed air to pass through the opening of the bottom pipeline to aerate the phosphoric acid in the aeration storage tank. Aeration was continued for 20 minutes at 110°C; potassium hydroxide was dissolved in deionized water under stirring to make a solution with a mass fraction of 35%, and then sent to a raw material storage tank with a spray generating device for atomization.
[0082] 2) Put the pretreated phosphoric acid solution in a conical enamel reaction kettle with a spray feed pipe and a stirring paddle on the top, raise the temperature to 80°C, and start stirring; preheat the 35% potassium hydroxide solution to 80°C ℃, then spray 16.1kg potassium hydroxide solution evenly into the reactor through the spray feed pipe on the upper part of the reactor through the metering pump, control...
Embodiment 2
[0091] Step (1)-(6) method is the same as embodiment 1;
[0092] Step (7) post-processing:
[0093] Further, add 0.6 kg of 200-mesh silicon dioxide to the prepared potassium dihydrogen phosphate particles, stir evenly in a mixer, and vacuum-dry until the product drying loss is ≤0.2%, to obtain phosphoric acid containing silicon dioxide anticaking agent Potassium Dihydrogen Granules.
Embodiment 3
[0095] 1) Put 115kg of high-purity phosphoric acid (made from phosphorus pentoxide) with a mass fraction of 90% in an aeration storage tank with an air inlet pipe installed on the top, and use compressed air to pass through the opening of the bottom pipeline to aerate the Phosphoric acid was continuously aerated for 15 minutes at 120°C; potassium hydroxide solid accounting for 95% of the total molar amount of phosphoric acid was dissolved in deionized water under stirring to form a solution with a mass fraction of 40%, and then sent to a spray generator In the raw material storage tank of the device, ready to use.
[0096] 2) Put the phosphoric acid solution after aeration pretreatment in a cone-shaped enamel reaction kettle with a spray feed pipe and a stirring paddle on the top, raise the temperature to 85°C, and start stirring; preheat the above potassium hydroxide solution to 85°C, then spray the preheated potassium hydroxide solution evenly into the reactor through the sp...
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