Approximately 80 × 1012 Btu/yr of thermal energy are contained in molten slags produced by the elemental phosphorus industry, the iron and steel industry, the copper industry, and wet-bottom coal-fired boilers. This study evaluates the technical, economic and environmental feasibility of recovering this wasted energy;the impact of slag waste heat recovery on the industries in question;and the steps necessary to commercialize applicable heat recovery technology.nThe study considered two approaches to recovering thermal energy from phosphorus slag: the float chamber and the contact tower. Based on these approaches, nine energy recovery options for converting the energy in slag into other usable forms of energy were conceptualized and economically evaluated.
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