Study of The Possibility of Obtaining Binding Materials from Phosphorus Industry Waste

The research work is devoted to the possibility of recycling large-tonnage solid waste of phosphorus production – phosphogypsum in order to obtain binders for use in the construction industry to obtain various building materials. The main parameters of the process (the composition of the main raw material, the degree of grinding of the raw material, the temperature and time of dehydration of phosphogypsum) were investigated in the work. Physical and chemical studies of the properties and structure of wastes have been carried out, which make it possible to determine the fundamental possibility (or impossibility) of their use in a particular production. The use of the Rankin diagram as a technical model made it possible to determine the location of technogenic wastes of phosphorus production. The X-ray phase analysis of the gypsum binder samples showed that the X-ray patterns show lines of diffraction maxima corresponding to hemihydrate calcium sulfate, i.e., upon heat treatment of phosphogypsum up to 200°C, dihydrate gypsum in the composition of phosphogypsum mainly transforms into hemihydrate gypsum, which has good binding properties. The results of the conducted studies showed the feasibility of processing old phosphogypsum into gypsum binder.