Record Display for the EPA National Library Catalog

RECORD NUMBER: 7 OF 18

Main Title Electron Paramagnetic Resonance (EPR) Investigation of Limestones and Their Calcines and Correlation with Reactivity with Acid Gases.
Author Ashfor, Nicholas A. ; Jark, Frank H. ;
CORP Author IIT Research Inst., Chicago, Ill.
Year Published 1972
Report Number IITRI-C6241-7; EPA-68-02-0208; R2-72-019;
Stock Number PB-211 504
Additional Subjects ( Limestone ; Electron paramagnetic resonance) ; ( Calcium oxides ; Electron paramagnetic resonance) ; ( Carbonate rocks ; Electron paramagnetic resonance) ; Crystal structure ; Chemical reactions ; Sulfur dioxide ; Roasting ; Slaking ; Air pollution ; Hydration ; Control ; Manganese ; Correlation ; Geochemistry ; Iron ; Trace elements ; Limestone scrubbing ; Air pollution control
Holdings
Library Call Number Additional Info Location Last
Modified		 Checkout
Status
NTIS  PB-211 504 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 78p
Abstract
A research program was undertaken to investigate a selected set of calcined and uncalcined carbonate rock samples by electron paramagnetic resonance (EPR) spectroscopy in order to assist in the characterization of marls and chalks to identify properties which account for their high reactivity with SO2, establish a semi-quantitative basis for evaluating a crystalline order of limestones to predict their reactivity with acid gases, investigate the effect of altering the calcination temperature on the crystalline structure of calcines in order to identify those properties which account for the varying reactivity and deadburning, and investigate the effects of slaking on the crystalline parameters of calcines produced at different temperatures in order to support wet limestone scrubbing process development using manganese ions as a probe of calcium carbonate crystallinity, the fitting of manganese EPR line width data to the SO2 reactivity and capacity data resulted in correlation coefficients of r = 0.55 and 4 = 0.49 respectively. No significant EPR linewidth correlation was found for the reactivity and capacity of calcined materials. (Author)