The effect of weak acid dissociable cyanide on gold and silver flotation in Hidden Valley Mine

Guo, B., Peng, Y. and Espinosa-Gomez, R. (2013). The effect of weak acid dissociable cyanide on gold and silver flotation in Hidden Valley Mine. In: Leon Lorenzen, World Gold 2013 Conference: Challenges in Gold Mining. Proceedings. 5th World Gold 2013 Conference, Brisbane, QLD, Australia, (341-346). 26-29 September, 2013.

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Name Description MIMEType Size Downloads
Author Guo, B.
Peng, Y.
Espinosa-Gomez, R.
Title of paper The effect of weak acid dissociable cyanide on gold and silver flotation in Hidden Valley Mine
Conference name 5th World Gold 2013 Conference
Conference location Brisbane, QLD, Australia
Conference dates 26-29 September, 2013
Proceedings title World Gold 2013 Conference: Challenges in Gold Mining. Proceedings
Place of Publication Carlton, VIC, Australia
Publisher AusIMM: Australasian Institute of Mining and Metallurgy
Publication Year 2013
Sub-type Fully published paper
Open Access Status
ISBN 9781921522956
9781921522963
Editor Leon Lorenzen
Start page 341
End page 346
Total pages 6
Collection year 2014
Language eng
Formatted Abstract/Summary
In gold processing plants, the water from the cyanidation stages is treated to detoxify cyanide species and this recycle water becomes the main part of the process water. Despite the low concentration of free and weak acid dissociable (WAD) cyanides in process water, the recoveries of gold and silver is still affected during flotation, especially when gold and silver are associated with iron sulfide minerals. This is a case at the Hidden Valley (HV) Mine. In this study, the effect of free and WAD cyanides on gold and silver recoveries by flotation from the HV Mine was considered.

WAD cyanide (WAD CN) was prepared by mixing sodium cyanide and copper sulfate at a cyanide to copper ratio of 3:1 dosed at different cyanide concentrations. It was found that both free and WAD CN depressed gold and silver and particularly iron sulfides in flotation. The depressed gold and silver recoveries were closely associated with the depressed recovery of iron sulfide minerals, suggesting that free and WAD CN may not depress the flotation of liberated gold and silver minerals significantly. It was also found that 10 ppm free cyanide completely depressed the flotation of iron sulfide minerals and WAD CN depression is probably through the WAD dissociation to free cyanide species (mainly aqueous HCN) during the grinding process, resulting from a decrease in pH. Thermodynamic calculation showed that 5.5 ppm free cyanide was released in the end of grinding at an initial WAD CN concentration of 50 ppm. This research provides a guideline to counteract the negative effect of WAD CN in the flotation of gold and silver minerals.
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Conference Paper
Collections: School of Chemical Engineering Publications
Official 2014 Collection
 
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Created: Sat, 08 Feb 2014, 15:59:23 EST by Dr Yongjun Peng on behalf of School of Chemical Engineering