On-Line control of supersaturation in a continuous cooling KCL crystallizer |
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Authors: | T P Redman S Rohani G Strathdee |
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Abstract: | Control of supersaturation in a 1-L continuous cooling KC1 crystallizer was investigated. The supersaturation was determined from on-line measurements of the density and temperature of clear liquor samples. A cascade control scheme was used to control the supersaturation through the manipulation of the co-saturated feed temperature set-point while maintaining the crystallizer temperature at 303.2 K. Experimental results showed that due to the suppression of spontaneous nuclearion, a decrease in the measured supersaturation resulted in a 23% increase in the mean crystal size and a 12% decrease in the amount of NaCl impurity in the KCI crystals. |
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Keywords: | supersaturation control KC1 crystallization CSD crystal purity |
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