INVESTIGATION OF THERMAL STABILITY OF RAW MATERIALS COMPONENTS AND NPK FERTILIZERS BASED ON THEM

UDC 661.152.3

 

Nosko Elena Vladimirovna – leading engineer of the Chemical Technology Department. JSC “Belgorkhimprom” (26a, Kiselyova str., 220029, Minsk, Republic of Belarus). E-mail: enosko@bmci.by

Eshchenko Lyudmila Semyonovna – DSc (Engineering), Professor, Professor, the Department of Inorganic Materials Technology and General Chemical Technology. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail:yeshchanko@belstu.by

DOI: https://doi.org/ 10.52065/2520-2669-2024-283-11.

Key words: NPK fertilizers, steam granulation, thermal stability, ammonium phosphates, carbamide, ammoniated superphosphate.

For citation: Nosko E. V., Eschenko L. S. Investigation of thermal stability of raw materials components and NPK fertilizers based on them. Proceedings of BSTU, issue 2, Chemical Engineering, Biotechnologies, Geoecology, 2024, no. 2 (283), pp. 92–97 (In Russian). DOI: 10.52065/2520-2669-2024-283-11.

Abstract

The work investigated the thermal stability of the initial components and NPK fertilizers based on them in the temperature range of 80–160°C. The dependence between the composition of nitrogen, phosphorus, potassium containing raw materials, their ratio in mixtures and the temperature of thermal stability has been established. It is shown that the most thermally decomposable is diammophos grade 18-46 (TU 113-08-556-93), whose mass loss in the temperature range of 80–100°C is 6.23–8.56 wt. %. The influence of the diammophos : urea mass ratio on the thermal stability of NPK fertilizers obtained on their basis has been established. The effect of temperature on the decomposition of ammoniated superphosphate as a potential raw material component for NPK fertilizers produced by JSC “Gomel Chemical Plant” has been studied. Variants of formulations of NPK fertilizers of grades 15-15-15, 15-08-15 based on the studied raw materials have been developed. It is shown that thermally the most stable fertilizers are those using ammonium as a phosphorus containing raw material with its mass ratio to urea equal to 1 : 0.32 (mark 15-15-15), as well as superphosphate ammoniated to urea with a mass ratio of 1 : 0.37 (mark 15-08-15). The content of phosphorus in the digestible form in the developed formulation of fertilizers of grades 15-15-15, 15-08-15 reaches 94–96% of the total content of P2O5, this fertilizer is watersoluble. The results of the study of the phase composition of samples of the developed formulations of NPK fertilizer are presented, it is noted that the samples contain not only chemical compounds introduced into the batch, such as KCl, (NH4)2SO4, NH4H2PO4 as well as KH2PO4, NH4Cl, formed as a result of physicochemical transformations during its heating.

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25.05.2024