Abstract

The cementation of gold from acidic thiocyanate solution was studied using aluminum powder. The related parameters such as pH, thiocyanate concentration, gold concentration, temperature, stirring speed, aluminum/gold mass ratio, presence of iron (III) and gas atmosphere were systematically investigated. The results show that temperature and deoxygenation were determined to positively affect the gold recovery. Conversely, the presence of iron (III) inhibits significantly the cementation reaction. The addition of fluoride into leach solution could overcome the inhibitory effect of iron (III) and enhance the gold cementation rate. It was established that the rate of the reaction was first-order with respect to the gold concentration. The activation energy was found to be 41.9kJ/mol and the cementation process was considered to be chemically controlled without the presence of ferric ion and the addition of fluoride ion in solution. A possible cementation mechanism was proposed.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.