VARIABILITY OF SOME FUNCTIONAL GROUPS OF THE IR SPECTRA OF PHOSPHORITES AFTER INTERACTION WITH MICROFLORA AND ACID TREATMENT

The article discusses the current problems of enrichment of low-grade phosphorites by thermal method, as well as the production of mineral fertilizers using various acids. An alternative biotechnological method for obtaining organomineral fertilizers using neutrophilic, heterotrophic microorganisms of the activated sludge of a biochemical purification station for processing low-grade phosphorites and obtaining phosphorus-containing organomineral fertilizers is proposed. The acceleration of the processes of modification of phosphorus cemented in the minerals of granular phosphorites, resembling the natural cycle of phosphorus in nature, is noted. A comparative description of functional groups in the IR spectra after microbiological treatment and subsequent treatment with sulfuric and nitric acids showed the transition of valuable components of phosphorus compounds to a state assimilated by plants. The performed studies can serve as a basis for the disposal of low-grade phosphorites unused in production