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Open AccessArticle
Comparative Analysis of the Recovery of Cu2+ and Au from Washing Solution of Pyrite Concentrate Slag by Two Processes
by
Kun Zhu
Kun Zhu 1,2,
Lei Qi
Lei Qi 3,4,* and
Libo Zhang
Libo Zhang 1,2,*
1
Faculty of Metallurgical Energy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
2
Yunnan Gold Group Weishan County Zhacun Gold Mine Co., Ltd., Dali 671000, China
3
Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China
4
Heqing Beiya Mining Co., Ltd., Dali 671000, China
*
Authors to whom correspondence should be addressed.
Minerals 2024, 14(9), 921; https://doi.org/10.3390/min14090921 (registering DOI)
Submission received: 25 June 2024
/
Revised: 18 August 2024
/
Accepted: 23 August 2024
/
Published: 7 September 2024
Abstract
A large amount of pyrite concentrate slag washing solution is produced in China every year, and this contains valuable components such as Cu2+ and Au. The traditional treatment method not only pollutes the environment but also wastes metal resources. For the washing solution containing Cu2+ 437 mg/L and Au 0.13 mg/L, two new processes comprehensive recovery schemes were developed and compared in this paper, namely iron powder replacement pore filtration and neutralization precipitation pore filtration. When the iron powder replacement pore filtration process was adopted, Cu2+ and Au were mainly comprehensively recovered in the form of a mixture of sponge copper and particulate gold. The test results showed that the replacement optimal conditions involved a pH of 3.0, iron powder dosage of 6 g/L, and replacement time of 3.0 h. After replacement, the filter cloth with below 1 μm pore size was used for filtration. The recovery rate of Cu2+ in the washing solution was 98.13 and the total recovery rate of Au was 95.83%. Otherwise, when the neutralization precipitation pore filtration process was adopted, Cu2+ and Au were mainly comprehensively recovered in the form of a mixture of copper hydroxide and particulate gold. The test results showed that sodium hydroxide was used as the precipitant and the optimum neutralization pH value was 6.5. After precipitation, the filter cloth with a below 1 μm pore size was used for filtration. The recovery rate of Cu2+ in the washing solution was 97.35% and the total recovery rate of Au was 93.54%. The economic benefit estimation of the two processes showed that the neutralization precipitation pore filtration process had the advantages of low material consumption, low cost and high economic benefit.
Share and Cite
MDPI and ACS Style
Zhu, K.; Qi, L.; Zhang, L.
Comparative Analysis of the Recovery of Cu2+ and Au from Washing Solution of Pyrite Concentrate Slag by Two Processes. Minerals 2024, 14, 921.
https://doi.org/10.3390/min14090921
AMA Style
Zhu K, Qi L, Zhang L.
Comparative Analysis of the Recovery of Cu2+ and Au from Washing Solution of Pyrite Concentrate Slag by Two Processes. Minerals. 2024; 14(9):921.
https://doi.org/10.3390/min14090921
Chicago/Turabian Style
Zhu, Kun, Lei Qi, and Libo Zhang.
2024. "Comparative Analysis of the Recovery of Cu2+ and Au from Washing Solution of Pyrite Concentrate Slag by Two Processes" Minerals 14, no. 9: 921.
https://doi.org/10.3390/min14090921
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