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Sodium humates, phosphorite, phosphoric acid, nitric acid, humate composition, humate-phosphate fertilizer


The influence of various factors on the process of interaction in the systems "sodium humate-mixture of phosphoric and nitric acids" and "phosphorite-mixture of acids-sodium humate" has been investigated. The influence of the ratios of the initial components, the amount of sodium humate introduced, the rate of the acid reagent, the temperature and duration of the reaction on the interaction process in the systems under study was studied, and the optimal process conditions were determined. The methods of chemical and physicochemical analysis revealed that as a result of interaction in the studied heterogeneous systems, ammonium humate, sodium acid phosphates, as well as sodium and ammonium nitrates are formed. Based on the studies carried out, it was found that the introduction of sodium humate prevents the inhibition of the decomposition of phosphate raw materials and the retrogradation of P2O5, i.e. the sparingly soluble calcium hydrogen phosphate formed as a result of the interaction of the initial components under the influence of sodium humate transforms into a readily soluble dihydrogen phosphate. A basic technological scheme for obtaining new types of humate-containing composite products has been developed. A basic technological scheme for obtaining new types of humate-containing products has been developed, which allows obtaining two types of products: fertilizers and compositions. When sodium humate interacts with an acidic reagent, the finished product is a humate composition, and if phosphorite is added to the system, a humate-phosphate fertilizer. The resulting products have a high content of P2O5, nitrogen and humic substances.

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