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Kinetics of Solid-Solid Reactions: Influence of the Number of Contact Points

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Title Kinetics of Solid-Solid Reactions: Influence of the Number of Contact Points
 
Creator AMARESH, R
PATHAK, M
SURESH, AK
 
Subject QUANTITATIVE RIETVELD ANALYSIS
TRICALCIUM ALUMINATE
SELF-DIFFUSION
CLINKER PHASES
PARTICLES
CAAL2O4
REFINEMENT
MECHANISM
MIXTURES
OXIDES
 
Description Dalvi and Suresh (AIChE J. 2011, 57, 1329-1338) proposed a model for the kinetics of a reaction between two particulate solids A and B, where B is the diffusing component, in terms of the average number of contact points N-AB between the two types of particles. In the present work, the applicability and validity of the model is studied, taking the formation of tricalcium aluminate from its immediate precursors as a candidate reaction. Partial analytical solutions to the Dalvi-Suresh model have been derived, and a simple parameter-estimation methodology has been developed. The data clearly show an influence of N-AB, and use of the Ginstling-Brounshtein model (Appl. Chein. USSR 1950, 23, 1327-1338) for parameter estimation leads to diffusivity values that depend on N-AB in a systematic way. Parameters estimated using the Dalvi-Suresh model, on the other hand, show only a random scatter and also show reasonable agreement with the values of diffusivity of Ca in oxides.
 
Publisher AMER CHEMICAL SOC
 
Date 2014-12-29T05:38:47Z
2014-12-29T05:38:47Z
2014
 
Type Article
 
Identifier INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 53(29)11659-11667
0888-5885
http://dx.doi.org/10.1021/ie501542p
http://dspace.library.iitb.ac.in/jspui/handle/100/17214
 
Language English