|Evaluating the Thermal Stability of Mercury and Other Metals in Coal Combustion residues Used in the Production of Cement Clinker, Asphalt, and Wallboard (EPA/600/R-09/152) December 2009
Research is underway by the U.S. Environmental Protection Agency (EPA) to document any changes that may occur to coal combustion residues (CCRs) as a result of implementation of mercury and multiipollutant control technology at coal-fired power plants. This work was cited as a priority in EPA's Mercury Roadmap (http://www.epa.gov/mercury/roadmap.htm) to ensure that cross-media transfers are not occurring and that mercury and other metals are not being controlled at a power plant and then later released based on the characteristics and management of fly ash and other air pollution control residues. This report focuses on the potential for an increase in the volatilization of mercury and other metals from the utilization of CCRs in the making of cement clinker, wallboard and asphalt, three end-use products which require heating during production. The four metals chosen for this study were mercury, arsenic, selenium, and lead due to their relatively low volatilities as metals. Heating temperatures of the CCRs for this study were chosen to simulate actual conditions encountered in the cement, wallboard, and asphalt industries.
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