Relationship between the morphological properties of half-calcined dolomite and the kinetics of the sulfation reaction

Autor:	L. H. Fuchs, B. R. Hubble, S. Siegel, E. L. Nielsen
Rok vydání:	1978
Předmět:	Calcite Chemistry Annealing (metallurgy) Kinetics Dolomite Inorganic chemistry Analytical chemistry General Chemistry Atmospheric temperature range Crystal chemistry.chemical_compound Sulfation X-ray crystallography Environmental Chemistry
Zdroj:	Environmental Science & Technology. 12:1411-1416
ISSN:	1520-5851 0013-936X
DOI:	10.1021/es60148a014
Popis:	A kinetic, morphological, and structural study has been made of the half-calcination process in BCR 1337 dolomite stones. The investigation covered the temperature range 640 to 800/sup 0/C in 40% CO/sub 2/ to 60% He and 100% CO/sub 2/ at 1-atm pressure. Certain morphological features which can have a bearing on subsequent sulfation kinetics have been examined. At the lower temperature, the calcite crystals are large and exhibit relic structures of the original dolomite crystals. As the half-calcination temperature increases, the calcite crystals within the relic grains become increasingly smaller and more randomly oriented until at 800/sup 0/C the randomization is almost complete. The calcite crystals exhibit disorder but show the onset of annealing at 800/sup 0/C after a 1-h heating period. Sulfation experiments on half-calcined stones containing small and large calcite crystals as well as those showing some annealing indicate that the kinetics are dependent to some extent on crystal size (surface area) and disorder. 12 figures.
Databáze:	OpenAIRE
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