On the effect of secondary nucleation on the crystal size distribution from a seeded batch crystallizer

✍ Scribed by A. Chianese; F. Di Berardino; A.G. Jones

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 962 KB
• Volume: 48
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(93)80309-e

✦ Synopsis

AMmct

-The rem&s of two series of cxpctients concerning, respectively, the breakage and the batch erystallimtion of Ks80, crystals suspended in liquids in the same apparatus are reported. A model, incorporattng erystnl breakage, to predict the performance of the seeded batch cooling crystallizer is also presented turd the ctkt of breakage on fine crystal distribution obtained is examined in detail. It is confirmed that f'ragments of potassium sulphate crystals arise by breakage over the whole size range up to the d size, and the generation rate by secondary nucleation is la&y dependent on magma density and supersaturation. In eonsequenee, a broadening of the product crystal size distribution is observed during seeded batch crystallization. This bchaviour Is well-simulated by the crystal breakage and growth model under modsrate cooling conditions; at high cooling rates, however, a significant deviation ia crystallimr fines dlstributlon occurs, implying a change in the mechanism of secondary nucleation on moving from slightly to highly supersaturated solutions.