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Separation Science and Technology Volume 54, 2019 - Issue 11
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Adsorption

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

A. SeyedhakimiDepartment of Research & Development, Faravari Pouya Zarcan Agh-Darreh Company, Tehran, Iran
,
S. A. BastamiDepartment of Research & Development, Faravari Pouya Zarcan Agh-Darreh Company, Tehran, Iran
,
S. GhassaSchool of Mining, College of Engineering, University of Tehran, Tehran, IranCorrespondence[email protected] [email protected]
ORCID Iconhttps://orcid.org/0000-0002-2107-8734
ORCID Icon,
H. RazaviDepartment of mineral processing engineering, Faculty of mining engineering, University of Amirkabir, Tehran, Iran
&
S. Chehreh ChelganiMinerals and Metallurgical Engineering, Dept. of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Luleå, SwedenCorrespondence[email protected] [email protected]
ORCID Iconhttps://orcid.org/0000-0002-2265-6321
ORCID Icon
Pages 1710-1721 | Received 21 Apr 2018, Accepted 22 Oct 2018, Published online: 29 Oct 2018
 
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ABSTRACT

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.

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