Thermoanalytical Study on Fertilizer Components and Their Mixtures
Thermal decomposition of several fertilizer components and their most important mixtures has been studied by simultaneous recording of the TG, DTG, and DTA curves up to 900 °C. The seven mixtures studied were NH4NO3+(NH4)2SO4, NH4NO3+KN03, 0.7NH4NO3•0.3KNO3+2NH4NO3;(NH4)2SO4, 0.7NH4NO•0.3KNO3 +NH4H2PO4, and (K, NH4)2(NO3)2SO4 with 2NH4NO3 • (NH4)2SO4, NH4H2PO4 or 0.7NH4NO3 • 0.3KN03. In addition to simple mixtures, synthetic and industrial compound fertilizers with varying N:P:K ratios were studied.
The effect of additional elements (Cu, Fe, Mg and B) and of experimental conditions, such as the amount of sample and the heating rate, was investigated for a synthetic fertilizer preparation containing N:P205:K20 in the ratio 20:10:10.
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