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Kinetic modelling of gold cyanide multi‐cycle adsorption and elution using activated carbon in the presence of foulants
Author(s) -
Otu Emmanuel O.,
Byerley John J.,
Robinson Campbell W.
Publication year - 1993
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450710614
Subject(s) - adsorption , cyanide , chemistry , activated carbon , thermal diffusivity , reagent , kinetics , elution , carbon fibers , chromatography , diffusion , inorganic chemistry , organic chemistry , thermodynamics , materials science , composite material , physics , quantum mechanics , composite number
A novel procedure was used to study the kinetics of multiple exposure of a granular activated carbon in a laboratory‐scale packed bed to solutions containing gold and sodium cyanide, or in addition one of several organic reagents commonly used in mineral processing. The repeated use of a carbon sample simulated the practice in industrial gold recovery operations. A batch, unsteady state adsorption model which assumed constant intraparticle diffusivity of Au(CN) 2 ‐ was used to model the kinetics of gold uptake. Upon repeated exposure of a carbon sample, up to a 3‐ to 4‐fold decrease in the intraparticle diffusivity of Au(CN) 2 ‐ was observed, combined with a much smaller loss of adsorption capacity.