RESEARCH OF PHYSICAL AND CHEMICAL TRANSFORMATIONS OCCURRING IN THE VOLUME OF GRANULES OF INTEGRATED MINERAL FERTILIZERS IN THE STORAGE PROCESS
Based on the study of physical and chemical transformations occurring in the volume of complex mineral fertilizer granules during storage for various brands of complex NPK, the absence of a significant concentration gradient of individual components in the volume of complex-mixed fertilizer granules was established, which indicates the optimal organization of the technological process and method. introduction of nitrogen-, phosphorus- and potassium-containing ingredients. The data of X-ray phase analysis of samples of complex fertilizers confirm the course of conversion processes at the stage of warehouse storage of the final product. This is confirmed by the presence of clear reflections characteristic of double salts of potassium-ammonium, in particular, ammonium arcanite, as well as corresponding to the adduct of carbamide with potassium chloride in the samples at the initial moment of time (product arrival at the warehouse). New scientific data have been obtained on the course of secondary conversion processes at the storage stage, leading to a significant change in the mineralogical composition and, as a consequence, to a change in the physical and mechanical properties of fertilizers. It has been established that when using prilled urea, the final product is subject to less caking compared to using granular urea as a raw material, which is associated with a slowdown in secondary conversion processes due to the additives present in the composition of prilled urea. Thus, the fact of a decrease in caking is noted for samples of fertilizers of the 15-15-15 brand, the formulation of which contains significantly less carbamide.