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Growth and aggregation rates for calcite and calcium oxalate monohydrate
Author(s) -
Collier Alan P.,
Hounslow Michael J.
Publication year - 1999
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690451105
Subject(s) - calcite , growth rate , chemistry , precipitation , calcium oxalate , ionic strength , reaction rate constant , mineralogy , oxalate , calcium , chemical engineering , thermodynamics , kinetics , inorganic chemistry , aqueous solution , mathematics , geometry , physics , organic chemistry , quantum mechanics , meteorology , engineering
Seeded batch experiments were conducted at low magma densities and moderate ionic strength to determine the growth and aggregation rate constants for calcite precipitation in a stirred vessel. The growth was found to be surface‐reaction‐limited, and the growth rates agreed broadly with other studies of calcite precipitation. Aggregation rates have rarely been presented for calcite. The aggregation rate constant studied here was directly proportional to the instantaneous growth rate and inversely proportional to the average shear rate in the vessel. The results were also compared with similar work carried out on calcium oxalate monohydrate. It was found that the relationship between the aggregation rate constant and stirrer speed was virtually identical in the two cases, despite almost an order of magnitude difference in the growth rate constants.