Abstract
The shortcomings of common equipment for utilization of phosphogypsum when processing it into semi-aqueous gypsum have been analyzed. Specific energy consumption per ton of produced construction gypsum in different equipment is shown. Calcination duration is compared. The reasons for the uncompetitivity of the process of production of construction gypsum compared to the production of natural gypsum stone are analyzed. Two problems are considered. The first - common equipment for burning construction gypsum is energy-intensive. The second is the established practice of washing impurities in phosphogypsum with water. At the same time, energy consumption increases several times due to the need for energy consumption for moisture evaporation. It is theoretically reasonable to carry out the firing in a suspended state. The firing time is a few seconds. The experimental studies show the possibility of producing construction gypsum by firing in a suspended state.
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