The simulation of gold adsorption by carbon using a film diffusion model
No Thumbnail Available
Date
2015-04-22
Authors
Johns, Mark William
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Experimental work showed that the adsorption of the aurocyanide
ion by activated carbon is under film diffusion
control until the carbon reaches 70 per cent of its
equilibrium loading capacity. A rate expression based on
the classical film diffusion rate expression is suggested
and the model for the batch test developed. The proposed
model is shown to simulate batch adsorption tests at
different ratios of carbon mass to solution volume.
The mass transfer coefficient was linked to the carbon
particle size and agitation rato by the use of dimensionless
numbers. Correlations are suggested for fixed beds,
fluidized beds and rolling bottles. It was determined
experimentally that, at equivalent Reynolds numbers, the
fixed bed provides the optimum system for mass transfer.
Description
Thesis (M.Sc.(Chemical Engineering))--University of the Witwatersrand, Faculty of Engineering, 1987.