Temperature Dependence of the Crystal Growth Rate of Potassium Sulfate at Low Temperature.

Thermodynamic Analysis of Temperature Dependence of the Crystal Growth Rate of Potassium Sulfate

“…It is clear that the crystal growth rate increases with increasing supersaturation in solution at the same temperature. At a certain supersaturation, the crystal growth rate decreases first and then increases with increasing temperature, and the minimum growth rate is found at around 303.15 K, which is in accordance with the data reported by Taguchi et al 6 This phenomenon can be explained theoretically according to eq 5.…”

“…It is notable that the calculated minimum crystal growth rate appears at 303.15 K for both aqueous K 2 SO 4 and KCl-K 2 SO 4 solutions. However, the experimental results by Taguchi et al 6 and those in this work show the minimum at about 293.15 K. It may be due to the fact that the activation energy comes from the experimental data of Garside et al 14 However, if the activation energy E and the pre-exponential constant k 0 is correlated from the experimental data by Taguchi et al, 6 the correlation coefficient R 2 of the regression is only 0.70, which implies the uncertainty of the experimental data.…”

“…However, the temperature dependence of the crystal growth rate of K 2 SO 4 is abnormal in the low temperature range; that is, the growth rate decreases with the increase of the temperature from 273.15 to 293.15 K. This abnormal phenomenon is probably due to the deposition of fine crystals on the seed crystal surface which may enhance the crystal growth rate. 6 Theoretical explanation is still needed to understand it clearly.…”

Modeling of specific structure crystallization coupling with dissolution

“…However, the temperature dependence of the crystal growth rate of K 2 SO 4 is abnormal in the low temperature range; that is, the growth rate decreases with increasing temperatures from 273.15 K to 293.15 K. This abnormal phenomenon is probably due to the deposition of fine crystals on the seed crystal surface, which may enhance the crystal growth rate [15]. Theoretical investigations are needed to explain it clearly.…”