Crystallization kinetics of ZnS precipitation; an experimental study using the mixed-suspension-mixed-product-removal (MSMPR) method by Mousa Al-Tarazi, A. Bert M. Heesink, Mohammed O. J. Azzam, Salah Abu Yahya, and Geert F. Versteeg

Crystal Research and Technology

Cryst. Res. Technol. 39, 675 (2004) - Abstract -

Crystallization kinetics of ZnS precipitation; an experimental study using the mixed-suspension-mixed-product-removal (MSMPR) method

Mousa Al-Tarazi, A. Bert M. Heesink, Mohammed O. J. Azzam*, Salah Abu Yahya*, and Geert F. Versteeg

Faculty of Science & Technology, University of Twente, Enschede, The Netherlands, www.utwente.nl
*Chemical Engineering Department, Jordan University of Science and Technology, Jordan, www.just.edu.jo

Keywords	precipitation kinetics, nucleation, growth, agglomeration, zinc sulfide
PACS	81.10.A
DOI	10.1002/crat.200310238

The precipitation kinetics of zinc sulfide were studied using a lab scale mixed-suspension-mixed-product-removal (MSMPR) precipitation reactor. The vessel was operated at different feed concentrations, molar ratios, stirrer speeds, pH-values, feed injection positions and residence times. Primary nucleation and volume average crystal growth rates as well as agglomeration kernel were determined. Relationships were found between the rates of the different crystallization steps on the one hand and supersaturation, stirrer speeds, pH-values, Zn²⁺ to S^2- ratio, feed positions on the other. These show that larger crystals are obtained at high supersaturation, moderate stirrer speeds, small residence times, a pH-value of around 5 and high Zn²⁺ to S^2- ratios. One should realize though that the applied MSMPR method is not the most optimal technique for examining fast precipitation reactions.

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