Industrial processing of phosphogypsum into organomineral fertilizer.

Abstract

The purpose of this study is to solve the problem of industrial waste storage. Waste from the production of mineral fertilizers is considered in this study (as an example-phosphogypsum LLC «Industrial group «Phosphorit»). Waste storages on a landfill have a significant negative impact on the environment. This fact has been confirmed by studies of wastewater from the dump (drainage water). Phosphogypsum utilization as a mineral component of an organic-mineral mixture without preliminary purification is the most promising approach. In this case, the joint utilization of lignin sludge as an organic component is required. The absence of excess content of toxic elements and the presence of plant nutrients in the required quantities was established as a result of laboratory studies of soil additive. In addition, the authors noted an increased content of stable strontium in phosphogypsum. Localization of strontium in the soil mixture is ensured by fractional application. Strontium is replaced by covalent calcium when the components are absorbed by the plants. The developed soil mixture should be considered as a single-use organomineral additive with prolonged action. Forestry activities, reclamation of disturbed lands, slopes of highways and landfills of solid municipal waste are promising areas of implementation.