TY JOUR TI CLOSED-CYCLE TECHNOLOGY FOR OBTAINING CONSTRUCTION GYPSUM FROM WASTE ENERGY AND FLUE GASES OF THERMAL POWER PLANTS KW gas emissions KW sulfur dioxide KW carbonate sludge suspension KW absorber KW gypsum dihydrate KW commercial product JO Problems of risk management in the technosphere AU Nikolaeva, L.A. AU Zainullina, E.R. AU Safina, G.G. PY 2024 IS 2024 PB Saint-Petersburg University of State Fire Service of Emercom of Russia