Development of granular organomineral fertilizers based on phosphogypsum, phosphorite, glauconite, and sapropel

In the context of increasing soil salinization and growing volumes of industrial chemical waste, the development of effective fertilizer amendments based on local raw materials and chemical by-products has become highly relevant. One of the most common wastes from the phosphate fertilizer industry is phosphogypsum, which is formed during the manufacture of wet-process phosphoric acid. This material contains a significant amount of calcium and sulfur and can be considered a potential component for fertilizing and soil-amending formulations. This study aims to develop formulations and investigate the preparation of granular organomineral fertilizers based on phosphogypsum, phosphorite, glauconite, and sapropel. The paper examines the preparation of raw materials and composite mixtures, as well as the granulation of mineral components, with ammonium-containing solutions used as a binding agent. Special attention is given to studying the influence of mineral and organic components on the structure and chemical composition of the granules. The results demonstrate that the combination of phosphogypsum with phosphorite, glauconite, and sapropel enables the formation of multicomponent organomineral systems with enhanced agrochemical and physicomechanical properties. The resulting granular materials can be considered promising fertilizer amendments for improving saline soil fertility and ensuring the sustainable utilization of high-volume chemical industry waste.

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