Production process of granulated mono ammonium phosphate (GMAP)

The invention discloses a production process of high-concentration granulated mono ammonium phosphate (GMAP). The production process comprises the concrete steps of respectively desulfurizing and clarifying dilute phosphoric acid with the mass concentration of 23-25% weighted by P2O5 and concentrated phosphoric acid with the weight concentration of 46-47% weighted by P2O5, and then, mixing and blending the dilute phosphoric acid and the concentrated phosphoric acid according to the weight ratio of (70-75):(25-30) to obtain a phosphoric acid solution; next, adding the phosphoric acid solution and gas ammonia into a tubular reactor, carrying out amino acid neutralization on the gas ammonia and the phosphoric acid solution which are added into the tubular reactor, and controlling the neutralization degree of reaction slurry at 1.02-1.07 and the reaction temperature at 95-105 DEG C; and finally, directly carrying out slurry spraying granulation on the obtained slurry, and drying to obtain the high-concentration GMAP product. Through the processes of desulfurizing, clarifying and acid blending, the content of impurities in phosphoric acid is reduced, the content of nutrients in the high-concentration GMAP product is ensured, and the quality of the product is improved.