Exploring relationships between various activations of granular activated carbon on silver and gold adsorption: A kinetic and equilibrium study

This investigation examined various kinetic and equilibrium models for gold (Au) and silver (Ag) adsorption from cyanide leach solution, onto surface of granular activated carbon (GAC) with 10, 35, 70 and 100% activities. Results indicated that the initial rate for Au and Ag adsorption is similar an...

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Bibliographic Details
Published inSeparation science and technology Vol. 54; no. 11; pp. 1710 - 1721
Main Authors Seyedhakimi, A., Bastami, S. A., Ghassa, S., Razavi, H., Chehreh Chelgani, S.
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 24.07.2019
Taylor & Francis Ltd
Subjects
Activated carbon
activation
Adsorption
Chemisorption
Cyanides
equilibrium
Gold
Heavy metals
kinetic
Metals
Mineral Processing
Mineralteknik
Organic chemistry
precious metals
Silver
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Summary:This investigation examined various kinetic and equilibrium models for gold (Au) and silver (Ag) adsorption from cyanide leach solution, onto surface of granular activated carbon (GAC) with 10, 35, 70 and 100% activities. Results indicated that the initial rate for Au and Ag adsorption is similar and increases by increasing the GAC activities. Outcomes showed that the adsorption for low activity GAC is proportional to the number of adsorption sites while the rate-limiting can be chemisorption for GAC with high activity. Thus, even low amount of contaminations on the fresh GAC can significantly decrease the capacity of precious metals adsorption.
ISSN:0149-6395
1520-5754
1520-5754
DOI:10.1080/01496395.2018.1540635