Open AccessKinetics of fly ash beneficiation by carbon burnout. Quarterly report, July 1--September 30, 1997
Author(s) -
J.N.D. Dodoo,
Joseph M. Okoh,
A. Diaz
Publication year - 1998
Language(s) - English
Resource type - Reports
DOI - 10.2172/663434
Subject(s) - beneficiation , fly ash , thermogravimetric analysis , carbon fibers , atmosphere (unit) , combustion , dolomite , spectrum analyzer , coal , environmental science , coal combustion products , materials science , mineralogy , waste management , chemistry , metallurgy , environmental chemistry , meteorology , composite material , engineering , physics , organic chemistry , composite number , electrical engineering
Oxidation studies of coal fly ash have been carried out at partial pressures in the range 1 atmosphere down to 400 torr. The studies have also been carried out at 1 atmosphere for different temperatures in the range 500 to 750 C. The equipment used was a state-of-the-art Cann Thermogravimetric analyzer having sensitive microbalance that permitted measurements to .1 {micro}g. The analyzer is part of a GC/MS/TG setup in this laboratory. The fly ash was supplied by Delmarva Power Indian River Plant, DE. The samples were dried and stored in a desiccator to ensure that they remained dry prior to combustion. The combustion process inside the TGA is continuous and the heat released can be related to the percent of carbon consumed. The setup provided easy identification of the elements in the fly ash. The elemental analysis was also augmented by use of an energy dispersive X-ray analyzer. In the X-ray analysis the carbon in the fly ash was compared with that in a dolomite (CaMg(CO{sub 3}){sub 2}) standard obtained from the US Bureau of Mines (USBOM). Preliminary data show encouraging results in the rate of reduction of the residual carbon. Both analyses show reduction of carbon after burning