Abstract
Approximately 80 x 10/sup 12/ Btu/y 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. The 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. All nine options are considered tecnically feasible and environmentally sound. The economics of the nine options are based on 33.9 kg/s (269,000 lb/h) of slag throughput and vary with both the energy from produced and the realizable total credits for different energy forms. Slag by-product credit is generally needed to make heat recovery economically attractive. Slag waste-heat recovery offers considerable potential for energy savings in the elemental phosphorus, iron and steel, and copper industries. Additional studies are recommended to determine if sufficient by-product credits can be obtained to justify this technology economically.
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