Coated potash fertilizer as well as preparation method and application thereof
A potash fertilizer and coating technology, applied in the application, potash fertilizer, layered/coated fertilizer, etc., can solve the problems of time-consuming, unbalanced, and intensified acidification in the mixing process, reduce the loss with rain, improve the Agronomic traits, the effect of improving the utilization rate of potassium ions
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[0027] The present invention also provides the preparation method of above-mentioned coated potash fertilizer, comprises the following steps:
[0028] (1) Use dry air to spray potassium hydroxide heated to molten state onto the turntable to obtain spherical potassium hydroxide particles; or use high-speed shearing method to shear potassium hydroxide heated to molten state onto the turntable to produce Spherical potassium hydroxide particles;
[0029] (2) adding calcium carbonate to the rotating disk containing the spherical potassium hydroxide particles described in step (1), to obtain the inner core wrapped with an alkaline material layer;
[0030] (3) spray polyvinyl alcohol aqueous solution to the surface of the spherical potassium hydroxide particle that step (1) obtains or the inner core surface that step (2) obtains and is wrapped with alkaline material layer, obtain coated potash fertilizer.
[0031] In the present invention, the pressure of the dry air injection is pr...
Embodiment 1
[0037] The potassium hydroxide raw material is heated to 380°C in a heating tank with a high-temperature-resistant cermet as the liner, so that the potassium hydroxide reaches a molten state. When sprayed with high-speed dry air, the potassium hydroxide droplets form spherical droplets due to surface tension, and the droplets solidify into round spheres when encountering cold wind. The round pellets solidified by the cold wind fall into the turntable that is equipped with 120 mesh lime powder, 20 revolutions per minute, and an angle of 55°. As the turntable rotates, the potassium hydroxide particles are wrapped with a layer of lime powder.
[0038] The mass ratio of polyvinyl alcohol to water is 3:10. First heat the water to 80°C, then slowly add polyvinyl alcohol and stir until dissolved; spray the polyvinyl alcohol aqueous solution through a high-speed atomizing pump, and evenly spray it on the lime Wrap the surface of the round granular potassium hydroxide that is rolling a...
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