Preg-robbing of gold in chloride-bromide solution

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2016
Major/Subject
Mcode
Degree programme
Language
en
Pages
8
244-251
Series
PHYSICOCHEMICAL PROBLEMS OF MINERAL PROCESSING, Volume 52, issue 1
Abstract
One of the major issue in gold chloride leaching is a tendency of gold to either precipitate or adsorb on a carbonaceous matter in an ore, i.e. preg-robbing. This paper discusses issues related to a preg-robbing phenomenon in gold hydrometallurgy, specifically in gold chloride-bromide leaching. This phenomenon has been observed in the 1800s to decrease gold recovery during gold chlorination as well as the state-of-art of gold cyanidation processes. The experiments were conducted in order to study the preg-robbing phenomenon in chloride-bromide media. The tendency of preg-robbing was demonstrated by adding carbon in a non-preg-robbing ore. It was shown that the preg-robbing tendency in the chloride-bromide media was very strong. Addition of 0.01% w/w of carbon powder into the non-preg-robbing ore decreased gold recovery from 92 to 70% and addition 5% w/w of carbon decreased gold recovery to almost zero.
Description
Keywords
Carbon, Gold, Hydrometallurgy, Leaching, Pre-robbing
Other note
Citation
Ahtiainen , R & Lundström , M 2016 , ' Preg-robbing of gold in chloride-bromide solution ' , Physicochemical Problems of Mineral Processing , vol. 52 , no. 1 , pp. 244-251 . https://doi.org/10.5277/ppmp160121