A. A. Mamataliyeva, Sh. S. Namazov

Table 2
Strength of granules of NS-fertilizers samples obtained on the basis of NH₄NO₃ and (NH₄)₂SO₄ melt, depending on the number of thermal cycle

Mass ratio NH4NO3 : (NH4)2SO4	Granule strength, kg/granule					Number thermal cycles 2060°С
	After making	After 10 thermal cycles	After 50 thermal cycles	After 100 thermal cycles	After 150 thermal cycles
Granulated NH4NO3 brand "B"	0.67	-	-	―*	―*	90
AN with 0.28% MgO	0.80	-	-	―**	―**	100
97 : 3.0	1.95	1.39	0.43	-	-	126
95 : 5.0	2.16	1.57	0.60	-	-	132
93 : 7.0	2.34	1.68	0.76	-	-	138
90 : 10	2.53	1.80	0.91	0.14	-	145
86 : 14	2.70	1.94	1.07	0.22	-	150
83 : 17	2.86	2.03	1.12	0.36	-	157
80 : 20	3.05	2.16	1.19	0.43	-	163
78 : 22	3.24	2.25	1.28	0.57	-	166
75 : 25	3.58	2.34	1.40	0.69	0.07	174
70 : 30	3.65	2.41	1.53	0.81	0.16	181
65 : 35	3.73	2.59	1.67	0.94	0.21	186
60 : 40	3.92	2.70	1.82	1.05	0.29	193

* Granules collapsed after 90 thermal cycles, ** after 100 thermal cycles.
Table 3 indicates the amount of completely destroyed granules of both pure NH₄NO₃, nitrate with 0.28% magnesia additive, and NS fertilizers after a certain number of thermal cycles. Thus, the introduction of ammonium sulfate into the NH₄NO₃ melt makes it possible to obtain a highly effective nitrogenous sulfur fertilizer with high granule strength and thermal stability.


Table 3
Thermal stability of granules of NS-fertilizers samples obtained on the basis of NH₄NO₃ and (NH₄)₂SO₄ fusion depending on thermal cycles

Mass ratio NH4NO3 : (NH4)2SO4	The number of destroyed granules by cycles of transitions of forms IV↔III, %
	10 cycle	25 cycle	50 cycle	90 cycle	100 cycle	150 cycle	175 cycle	200 cycle
Granulated NH4NO3 brand "B"	5	21	36	100	―*	―*	―*	―*
AN with 0.28% MgO	−	13	27	82	100	―**	―**	―**
97 : 3,0	−	−	19	67	86	−	−	−
95 : 5,0	−	−	15	54	79	−	−	−
93 : 7,0	−	−	9	46	65	−	−	−
90 : 10	−	−	4	37	53	−	−	−
86 : 14	−	−	−	28	47	100	−	−
83 : 17	−	−	−	15	38	95	−	−
80 : 20	−	−	−	10	24	89	−	−
78 : 22	−	−	−	6	19	83	−	−
75 : 25	−	−	−	3	12	78	100	−
70 : 30	−	−	−	−	8	71	96	−
65 : 35	−	−	−	−	5	66	88	−
60 : 40	−	−	−	−	2	54	79	100

* Granules destroyed after 90 thermal cycles, ** after 100 thermal cycles.


Conclusion. Research has been carried out to obtain a sulfur-containing nitrogen fertilizer based on melt and powdered ammonium nitrate and sulfate. It was found that the more powder-like ammonium sulfate is introduced into the ammonium nitrate melt, the lower the N content and the higher the S content in the product. It was also shown that the greater the amount of ammonium sulfate, the lower the caking and absorbency of diesel oil and the higher the strength, thermal stability, water solubility and decomposition temperature of nitrate granules. Thus, samples of ammonium sulfate nitrate have improved physicochemical, agrochemical, and lower detonation properties.

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