Effective use of phosphogypsum waste from phosphorus production

Abstract

The article presents a brief overview of the methods and methods of application of phosphogypse, which is a waste of phosphorus production, as part of a long-term mineral fertilizer for use in various sectors of the national economy and, in particular, in the agro-industrial complex. The results of the study of the physico-chemical properties of phosphogyps are presented to justify the possibility of using it as a meliorant in the calcination of acidified soils due to the presence of CaSO4, macro - and microelements in its composition. X - ray phase analysis of phosphogypsa shows the content of old and new piles: gypsum CaSO4∙2H2O - 87.93% and 85.04%; Quartz SiO2 - 9.10% and 10.58%; bassanite CaSO4 ∙ 0,67H2O -2.97% and 4.38%, respectively. The authors have studied chemical composition of phosphogyps samples taken from old and new landfills of the Taraz branch of Kazphosphate LLP. Differential-thermal and IR analysis of phosphogyps samples of these dumps was carried out. It turned out that there are no special differences in the content of the main components. Based on the conducted studies, the authors studied the possibility of obtaining a new range of complex mixed fertilizer mixtures from solid waste of industrial facilities with a long-acting content. Complex mixed fertilizer in the plan includes a phosphorous substance, vermiculite as a moisture-retaining component, internal rocks containing trace elements as a soil cover neutralizer to reduce acidification and salinization of acreage, and phosphogyps.