Production of Lime-Ammonium Nitrate Based on Chalk, Nitrate and Ammonium Sulfate

Abstract

The article studies the process of obtaining carbonate-ammonium nitrate (CAN) based on the mixing of melt ammonium nitrate (NH4NO3) with chalk (СаСО3) and ammonium sulfate (NH4)2SO4). For the granulation of nitrate-sulfate-carbonate melt the prilling method is applied using a granulation tower. Determined the composition and properties of new types of fertilizers. It is shown that with the ratio NH4NO3 : СаСО3 : (NH4)2SO4 = 100 : 24 : 1 the product contains 28,03% N, SO3 – 0,50%, 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). Porosity and absorption of pure AN granules is 22,0% and 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 porosity and absorbency of the LAN granules is 6,11% and 2,57g, respectively. It was revealed that the use of the (NH4)2SO4, СаСО3 additive in the NH4NO3 melt at a mass ratio of NH4NO3 : СаСО3 : (NH4)2SO4 = from 100 : 2 : 0,5 to 100 : 58 : 2 allows to increase the strength and temperature of the onset of decomposition of the nitrate granules by 2-6,7 and 1-1,3 times and reduce the porosity by 2,7-4,8 2 times.

Obtaining ammophosphate and sulfoammophosphate fertilizers on base of the washed dry concentrate containing 26% P2O5

“…from 72.32 to 26.90; from 89.14 to 47.06; from 69.07 to 25.47%, from 84.26 to 28.57 and from 18.84 to 51.33%, respectively, for phosphorite powder (17.65% P2O5; 15.2% CO2; CaO: P2O5 = 2.69), chemical concentrate (26.76% P2O5; 4.51% CO2; CaO: P2O5 = 1.73); thermoconcentrate (27.26% P2O5; 2.41% CO2; CaO: P2O5 = 1.96), dust fraction (18.54% P2O5; 14.8% CO2; CaO: P2O5 = 2.4) and mineralized mass ( 14.33% P2O5; 14.7% CO2; CaO: P2O5 = 3.0). The first raw material is processed into nitrocalcium phosphate fertilizer (NCPF -6% N; 16% P2O5) at JSC "Samarqandkimyo", the second was obtained according to the method described in [19][20][21][22], which was subjected to chemical enrichment, that is, 52% nitric acid to dissolve and remove calcite in the form of calcium nitrate.…”