Abstract
Experiments on the growth of gypsum crystals in suspension have been analysed by three methods. The most adequate description of the growth process has been obtained by applying a method, based on the relationship between the overall growth rate, the linear growth rates of the different crystals faces and the normalized volume of the crystals. The overall growth rate has been factorized into a concentration dependent function R and a function depending on the normalized volume of the crystals. Introduction of an expression for R, derived from the spiral growth model, has given a good fit with the experimental data. At constant concentration of the bulk solution the growth rate decreases with increasing normalized volume of the crystals. The results from the fitting procedure and the microscopic observations together indicate that the growth of gypsum occurs by a combined spiral growth and layer growth mechanism.
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