OBTAINING POTASSIUM-CONTAINING FERTILIZERS FROM WASTES OF THE PHOSPHORUS INDUSTRY

Abstract

Introduction. 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 P2O5 at 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 P2O5 is 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
P2O5 at the level of simple and enriched superphosphate, the phosphate part of which is represented
almost entirely by the citrate-digestible form of P2O5.