The invention discloses a production process of a high-
potassium-based compound
fertilizer, which comprises the following steps: S1,
raw material pretreatment: crushing
potassium feldspar to 200 meshes, mixing with 5%
sulfuric acid according to a
mass ratio of 1: 3, calcining at 120-130 DEG C for 2-3 hours, washing with water until the pH is 6.5-7.0, and
drying to obtain
potassium feldspar activated
powder; s2, putting a potassium citrate solution, a
calcium citrate solution,
potassium feldspar activated
powder, a
trace element organic acid salt solution,
urea,
modified zeolite and a binder into a high-speed mixer in proportion, uniformly stirring, and granulating by adopting a high
tower to obtain base material particles; s3, the base material particles are dried, broken particles with the
diameter smaller than 2.5 mm are removed, multiple
layers of composite films are sprayed to the surfaces of the base material particles for
coating, and coated base material particles are obtained after
drying; and S4, spraying a
bacillus subtilis microbial agent on the surfaces of the coated base material particles, and
drying at low temperature to obtain the high-potassium-based compound
fertilizer. The high-potassium-based compound
fertilizer produced by the invention has the advantages of high
nutrient content, long fertilizer efficiency and small environmental
pollution, and can improve the soil environment and increase the
crop yield.