Effects of reactor type and mass transfer on the morphology of CuS and ZnS crystals by Mousa Al-Tarazi, A. Bert M. Heesink, and Geert F. Versteeg

Crystal Research and Technology

Cryst. Res. Technol. 40, 735 (2005) - Abstract -

Effects of reactor type and mass transfer on the morphology of CuS and ZnS crystals

Mousa Al-Tarazi, A. Bert M. Heesink, and Geert F. Versteeg

aculty of Science & Technology, University of Twente, Enschede, The Netherlands, (www.utwente.nl)

Keywords	crystal morphology, copper sulfide, zinc sulfide, bubble column, MSMPR, laminar jet
PACS	81.10.A
DOI	10.1002/crat.200410421

For the precipitation of CuS and ZnS, the effects of the reactor/precipitator type, mass transfer and process conditions on crystal morphology were studied. Either H₂S gas or a S^2- solution were applied. Three different types of reactors have been tested, namely a laminar jet, a bubble column and an MSMPR reactor. The choice of reactor type as well as mass transfer and metal concentration all have a considerable influence on the morphology of the produced crystals. A well mixed bubble column with H₂S containing gas as feed yields the coarsest crystals. Use is then made of the surface active properties of CuS-particles, which induce agglomeration at the gas-liquid interface, where as the low metal concentrations inside the reactor also contribute to the formation of coarser particles (especially for ZnS).

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