Describe the present invention in detail below in conjunction with drawings and Examples; Fig. 1 has provided the technical process of the best of the present invention; at first ammonium nitrate is measured; slightly broken with the wolf's fang crusher; be transported to dissolving in the dissolving tank 1 in the ammonium nitrate dissolution system device then; here be to utilize ammonium nitrate solubleness to the very sensitive characteristics of temperature; its solvent temperature is controlled in 85～115 ℃ of scopes; ammonium nitrate solution after the dissolving enters dashpot 9; the temperature of dashpot is controlled within 85～115 ℃; then required ammonium nitrate solution is transported to granulation on the pulverulent solids material fertilizer that quantitatively sprays uniformly in the tablets press within it by the insulation of ammonium nitrate pump; the pulverulent solids material fertilizer by solid phosphate fertilizer and potash fertilizer and trace element fertilizer respectively after pulverizer is pulverized; after mixing in required ratio metering, measuring apparatus delivers in the tablets press; selected tablets press is a rotary drum granulator; on rotary drum granulator, be provided with ammonium nitrate shower nozzle and steam shower nozzle; helping ammonium nitrate solution evenly sprays and infiltration; make the particle nutrient more even; improve balling ratio; meanwhile; can spray steam on demand; steam plays regulates granulation water and temperature action; its moisture content is controlled at 3.5-5.5%; dry under the effect of the big air quantity gaseous media of low temperature with combination flight formula drying machine then; make the more all even safety of dry materials; the oven dry material temperature is about 60 ℃; again through cooling; cooling back temperature of charge is controlled at below 40 ℃; sieve out finished particle; finished particle evenly wraps up with aforementioned parcel oil on the parcel tube; prevent moisture absorption of ammonium nitrate fertilizer material and caking; defective particle after the screening is pulverized the back and is returned tablets press as returning charge with fine powder, measures finished product packing at last.Fig. 2 has provided ammonium nitrate dissolution system apparatus structure synoptic diagram, and it is made of dissolver and snubber assembly.Described dissolver is by dissolving tank 1, the steam coil 2 of band steam-gas inlet C is installed in the dissolving tank 1, dissolving tank 1 top is provided with import 3 and the water-in W of ammonium nitrate solid material S, the stirring arm 7 that is driven by reducing motor is installed in the dissolving tank 1, through type vapour pipe 6 is installed the upflow tube 5 that is communicated with snubber assembly at dissolving tank 1 upper end sidewall and is constituted; Described snubber assembly is by dashpot 9, and the steam coil 10 of mounting strap steam-gas inlet C in the dashpot 9 is provided with the export mixes of ammonium nitrate solution A at the lower end of dashpot 9 sidewall, and the water in the system, vapour, liquid level are controlled by robot control system(RCS).Solid ammonium nitrate through the metering coarse breaking continuously adds dissolving tank 1 from opening for feed 3, quantitatively add water W from water-in, under the effect of steam coil 2 well heaters and straight-through steam, make solution temperature in 85～115 ℃ of scopes, keep selected temperature constant state by robot control system(RCS), under the effect of stirring arm 7, the solid ammonium nitrate is dissolved rapidly, constantly flow in the dashpot 9, also be provided with the temperature that steam coil 10 well heaters keep solution in the dashpot 9, constantly supply with the ammonium nitrate solution of the required flow of granulating system certain pressure again by the ammonium nitrate pump.Production technique provided by the invention and equipment can be used for producing the universal or special composite fertilizer of any prescription.Below with paddy rice

Embodiment one: paddy rice composite fertilizer (by % weight) ammonium nitrate 43%, monoammonium phosphate 34%, Repone K 20%, surplus is the trace element fertilizer material formula.Its production process: become fine powder below monoammonium phosphate, Repone K and micro-separated pulverizing become 20 orders, metering according to the above ratio enters rotary drum granulator after mixing; Ammonium nitrate metering, broken back are dissolved at dissolution system; solvent temperature is at 100～115 ℃, the insulation of ammonium nitrate solution is delivered to carries out spray granulating on the rotary drum granulator, and granulation water is about 5%; enter drying on the whizzer behind the granulating, drying temperature is that temperature of charge is controlled at 60 ℃.On the rotating cylinder cooler, cool off then,, grain is wrapped up after telling at 1～4.5 millimeter particle, carry out metering packing at last by bolting.Remain and return granulating system as returning charge with fine powder after defective particle is pulverized.

Embodiment two: corn composite fertilizer: (by % weight) ammonium nitrate 48.5%, monoammonium phosphate 34%, Repone K 16.2%, surplus is a trace element formula.Its production process is same as paddy rice composite fertilizer production process.

Embodiment three: tobacco compound fertilizer: (by % weight) ammonium nitrate 15%, coarse whiting 20%, general calcium 23%, vitriolate of tartar 34% prescription.Its production process is for to become fine powder with coarse whiting, general calcium, vitriolate of tartar separated pulverizing, and metering according to the above ratio enters rotary drum granulator after the uniform mixing; With ammonium nitrate metering, the broken dissolving at dissolution system afterwards; solvent temperature is at 85～95 ℃; ammonium nitrate solution insulation is delivered to carries out spray granulating on the rotary drum granulator; granulation water is about 4%; enter behind the granulating and carry out drying on the whizzer; drying temperature is that temperature of charge is controlled at about 60 ℃, and it is described that all the other production processes are same as embodiment one.