Abstract
The integrated use of mineral raw materials based on the processing of industrial waste is one of the most important tasks of modern technologies. In the phosphorus industry, such a problem is the disposal of toxic phosphorus-containing waste for fertilizers. The purpose of this work is to obtain potassium-containing fertilizers from phosphogypsum and сotrel “milk” filtrate. Results and discussion.Analysis of the results showed that from the technogenic waste of the phosphorus industry -filtrate of сotrel "milk" and gypsum using the acid method under ammoniation and drying conditions, it is possible to obtain fertilizers with a high potassium content, in which the sum of the nutritional components is represented by P, K and N. In terms of properties, the optimal fertilizers are products containing total P2O5at the level of enriched superphosphate and simple superphosphate. Conclusion.The possibility of obtaining potassium-containing phosphorus fertilizers with a high content of K2O (6.9%) from the filtrate of сotrel “milk” and phosphogypsum, in which practically P2O5is in a water-soluble form (97.5-97 rel.%), has been shown. It has been established that during the complex processing of сotrel “milk” by the acid method under drying conditions to obtain potassium-containing phosphorus fertilizers, the sum of the nutritional components is P2O5+ K2O+N 17.29-77.3%. Thus, from the filtrate of сotrel “milk” and phosphogypsum, potassium-containing phosphorus fertilizers were obtained containing total P2O5at the level of simple and enriched superphosphate, the phosphate part of which is represented almost entirely by the citrate-digestible form of P2O5.