Research into the process of storage and recycling technogenic phosphogypsum placers
Viktor Moshynskyi, Zinovii Malanchuk, Valerii Tsymbaliuk, Larysa Malanchuk, Ruslan Zhomyruk, Oleksandr Vasylchuk
Abstract
Purpose. Study of technogenic placers storage conditions using the example of phosphogypsum dumps at PJSC “Rivneazot” by determining the rocks sorption properties, distribution and concentration of elements, as well as substantiation of recommendations for this production waste recycling. \nMethods. A series of experimental, laboratory, and full-scale studies of the hydrophysical soils properties have been conducted and the degree of their pollution by phosphogypsum waste under PJSC “Rivneazot” conditions has been revealed. Coefficient of permeability was found using the PVN-OO appliance. Granulometric composition was determined by the method of N.A. Kachynskyi. Mathematical modelling of the elements distribution process within the waste storage was applied. The migration of phosphorus, fluorine, sulphur, copper, chromium, manganese, zinc, lead, cadmium, iron, nickel and cobalt along the profile of artificial soil cross section has been studied. The experimental data were approximated and statistically processed in the MathCad and Microsoft Excel software packages. \nFindings. The patterns of rare earth elements distribution in technogenic placers within the mining waste storage have been determined. The authors have developed a mathematical model of the polluting agents’ filtration process through the soil massif. The recommendations are presented on the environmentally safe storage and recycling of phosphogypsum waste. A technology is proposed for the соmprehensive phosphogypsum wastes recycling of anti-radiation building products manufacture, which is accompanied by rare earth elements extraction. \nOriginality. The main factors and patterns have been revealed that regulate the distribution of rare earth elements in technogenic placers within the mining waste storage, which influence the rocks sorption properties. \nPractical implications. Based on determined patterns, the study substantiates the practical possibility for recycling the technogenic placers within the phosphogypsum waste storage and identifying the zones with maximum elements concentration.