Combined Experimental Study on Flotation—oxidation Leaching of a Gold Flotation Tailings in Laos

SHENG Jie; LIU Quanjun; DONG Jingshen; GAO Yalong; LIU Meilin

doi:10.13779/j.cnki.issn1001-0076.2022.01.039

2022 Vol. 42, No. 6

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SHENG Jie, LIU Quanjun, DONG Jingshen, GAO Yalong, LIU Meilin. Combined Experimental Study on Flotation—oxidation Leaching of a Gold Flotation Tailings in Laos[J]. Conservation and Utilization of Mineral Resources, 2022, 42(6): 94-100. doi: 10.13779/j.cnki.issn1001-0076.2022.01.039

Citation:

SHENG Jie, LIU Quanjun, DONG Jingshen, GAO Yalong, LIU Meilin. Combined Experimental Study on Flotation—oxidation Leaching of a Gold Flotation Tailings in Laos[J]. Conservation and Utilization of Mineral Resources, 2022, 42(6): 94-100. doi: 10.13779/j.cnki.issn1001-0076.2022.01.039

Combined Experimental Study on Flotation—oxidation Leaching of a Gold Flotation Tailings in Laos

1.
State Key Laboratory of Complex Nonferrous Metals Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China
2.
Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China

More Information

Corresponding author: LIU Quanjun, kmliuqj@163.com

Received Date: 19 April 2022

Publish Date: 26 December 2022

Abstract

Abstract

The flotation tailing of a gold mine from Laos has a gold grade of 2.99 g/t, and the gold content is relatively high. Systematic beneficiation experimental studies were carried out to recover the tailings efficiently. Gold in tailings mainly occurs in sulfide, followed by intergrowth gold and monomer gold. Therefore, the flotation-oxidation leaching combined separation process was decided to employ upon that accountant above, and lime was used as pH regulator, sodium hexametaphosphate and sodium silicate were used as gangue dispersants, CuSO₄ and Pb(NO₃)₂ were used as activators, and ammonium dibutyldithiophosphate and butyl xanthate were used as collectors. Through the closed-circuit process test of "one coarse, three cleaning and three scavenging" on the basis of condition tests, the gold concentrate with a gold grade of 28.57 g/t and recovery of 67.36%, and the gold tailings with a gold grade of 1.05 g/t were obtained respectively. Then by using potassium permanganate as the oxidant and sodium cyanide as the leaching agent for oxidize and leach the tailings, the leaching rate of gold, in the best performance, was 43.57%, which was 14.22% over the raw ore, and the gold grade was only 0.6 g/t in the leaching residue, and the total recovery of gold was 81.58%. The relatively satisfactory production index was obtained eventually.
- gold tailings /
- pyrite /
- oxidizing leaching /
- flotation

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References

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