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RECORD NUMBER: 35 OF 135

OLS Field Name OLS Field Data
Main Title Comparison of Several Standard Materials and Techniques for the Warren-Averbach Determination of Microstructure Characteristics of Calcium Hydroxide Sorbent Materials.
Author Briden., F. E. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab.
Publisher c1990
Year Published 1990
Report Number EPA/600/J-90/181;
Stock Number PB91-116855
Additional Subjects Calcium hydroxides ; Absorbers(Materials) ; Air pollution ; Sulfur oxides ; Microstructure ; Chemical reactivity ; Surface chemistry ; Combustion products ; Reprints ;
Holdings
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Status
NTIS  PB91-116855 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 03/04/1991
Collation 8p
Abstract
The paper gives results of a comparison of several standard materials and techniques for the Warren-Averbach determination of microstructure characteristics of calcium hydroxide--Ca(OH)2--sorbent materials. The comparison is part of an investigation of the injection of dry Ca(OH)2 into combustion streams for the removal of sulfur oxides (SOx). It has been known, for some time, that the reactivity for removal of SOx varies over a wide range for different batches of Ca(OH)2. Because reactivity is a critical factor in the economics of the process, a method to predict the reactivity of Ca(OH)2 batches is desirable. Reactivity can be affected by many factors, including the origin of the calcium carbonate mineral from which the hydroxide is produced, production conditions, and the presence of additives used for reactivity enhancement. It has been theorized that all of the preceding contribute to such physical characteristics as surface area, particle size, and porosity. The examination of these physical characteristics has provided the basis for understanding the reaction processes, but has not provided all the factors necessary to correlate intrinsic sorbent characteristics with reactivity.