Synthesis of NPK fertilizer from low-grade phosphate raw material
Kareeva A. Besterekov U. Abdurazova P. Nazarbek U. Pochitalkina I. Raiymbekov Y.
1 August 2022De Gruyter Open Ltd
International Journal of Chemical Reactor Engineering
2022#20Issue 8805 - 814 pp.
The article presents the results of studies of the process of obtaining NPK fertilizer from low-grade phosphate raw materials with P2O5 of about 18%. Phosphate raw materials were leached with a mixture of nitric-phosphoric acids with the addition of potassium carbonate, which serves as a source of potassium in the final product. The main parameters determined were the content of the main nutrients P2O5:N:K2O, temperature and time of the leaching process. According to the graphical method, the apparentactivation energy of the heterogeneous process is found, which is equal to 3.8 kJ/mol indicates the intradiffusion nature of the process. Methods of chemical analysis, scanning electron microscopy and XRD analysis were used for a comprehensive study of raw materials and final products.
low-grade phosphate raw materials , monocalcium phosphate , nitrogen-phosphoric acid decomposition , NPK fertilizer , phosphorus pentoxide
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M Auezov South Kazakhstan State University, Shymkent, Kazakhstan
Dmitry Mendeleev University of Chemical Technology of Russia, Moskva, Russian Federation
M Auezov South Kazakhstan State University
Dmitry Mendeleev University of Chemical Technology of Russia
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