Record Display for the EPA National Library Catalog


Main Title Sintering of Nascent Calcium Oxide.
Author Borgwardt, R. H. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab.
Publisher c1989
Year Published 1989
Report Number EPA/600/J-89/006;
Stock Number PB89-236400
Additional Subjects Calcium oxides ; Air pollution control ; Surface chemistry ; Reaction kinetics ; Mathematical models ; Temperature ; Impurities ; Limestone ; Porosity ; Sintering
Library Call Number Additional Info Location Last
NTIS  PB89-236400 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 10p
The paper discusses the measurement of the sintering rate of CaO in a nitrogen atmosphere at temperatures of 700-1100 C. CaO prepared from ultrapure CaCO3 was compared with an impure CaO derived from limestone. Both materials yielded an initial surface area of 104 sq m/g. The rate of surface reduction was independent of particle size between 2 and 20 micrometers, but strongly dependent on temperature and impurities. A model was used to correlate the kinetics of surface reduction and identify lattice diffusion as the mechanisms of solid transport. Impurities increased the rate of sintering at a given temperature and reduced the activation energy. The porosity declined logarithmically with time during the intermediate stage of sintering.