For the granulation of nitrate-sulfate-carbonate melt, the prilling method is applied using a granulation tower. The composition and properties of new types of fertilizers were studied. It is shown that with the ratio NH4NO3: СаСО3: (NH4)2SO4 = 100: 24: 1 the product contains 28,03% - N, 0,50% - SO3, 10% - СаО and has a granule strength of 6.03 MPa, which is much higher than the strength of pure NH4NO3 granules (1.32 MPa). The absorption of pure AN granules is 4.82 g. With an increase in the proportion of chalk and ammonium sulfate to the NH4NO3: СаСО3: (NH4)2SO4 = 100: 24: 1 ratio, the absorbency of the LAN granules is 2.57g.

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Abstract. In this article, the composition of products obtained at processing mineralized mass from Central Kyzylkum phosphorites (14.33% P2O5) with wet processing phosphorus acid, containing three types of concentration (14.32; 18.55; 24.23% P2O5) at temperature 75°C for 30 minutes and at under various norms of phosphorus acid has been studied. Activation of the mineralized mass with extraction phosphoric acid was carried out in the range of weight ratios of P2O5 in acid to P2O5 in raw materials from 1: 0.66 to 1 : 0.17, that is, in the range of phosphoric acid standards from 20 to 75% of the stoichiometric rate for the formation of monocalcium phosphate.It was found that the optimal norm of H3PO4 had made 55%. At this, the obtained products contained high concentration of common, available and water soluble forms of P2O5. The water-insoluble precipitate at an optimum phosphoric acid rate of 55% of the stoichiometry contains 32.58% of P2O5, 30.95% CaOcom, and the ratios of P2O5avail: Р2О5com = 42.57%, СаОavail : СаОcom= 40.97% and СаО : Р2О5 = 0.95.