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• W2072039676 abstract "The crystal growth kinetics of calcium sulfate α-hemihydrate (α-HH) in nearly constant supersaturated HCl–CaCl2 solutions were investigated. Two types of solutions were used, the first had a low HCl (1.4 mol/L) and high CaCl2 (2.8 mol/L) concentration and the second had a high HCl (5.6 mol/L) and low CaCl2 (0.7 mol/L) concentration. These conditions were chosen to represent the first and last stage of a newly developed stage-wise HCl regeneration process. The seeded growth experiments were carried out in a stirred, temperature controlled semi-batch reactor in which supersaturation was kept constant by simultaneous addition of CaCl2 and Na2SO4 solutions. The influence of the following parameters on α-HH crystal growth was studied: temperature (70–95 °C), specific power input of stirring (0.02–1.29 W/kg) and equimolar inflow rate of CaCl2 and Na2SO4 (0–0.6 mol/h). The crystal growth rate was derived from particle size distribution measurements made with the laser light diffraction technique. It was found that the surface area normalized crystal growth rate increased linearly with the molar inflow rate up to 0.3 mol/h, at higher inflow rates no further increase of the growth rate was observed. Temperature and specific power input, within the investigated ranges, did not show a marked effect on the growth rate, attributable to a diffusion/adsorption controlled growth process. An interesting finding of the present research is the establishment of a positive relationship between the narrowing of the width of the particle size distribution with increasing crystal growth rate. The results show that the resulting particle size distribution is positively related to the reagent inflow rate, a finding that can be applied to the industrial design and scale-up of the α-HH crystallization/HCl regeneration process." @default.
• W2072039676 created "2016-06-24" @default.
• W2072039676 creator A5035216496 @default.
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• W2072039676 date "2012-07-01" @default.
• W2072039676 modified "2023-09-24" @default.
• W2072039676 title "The crystal growth kinetics of alpha calcium sulfate hemihydrate in concentrated CaCl2–HCl solutions" @default.
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• W2072039676 doi "https://doi.org/10.1016/j.jcrysgro.2012.04.014" @default.
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