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NOBLE METALS AND ITS ALLOYS
ArticleName Conditioning of POX slurry and its effect on pressure oxidation performance of refractory gold sulphide ore
DOI 10.17580/tsm.2023.01.05
ArticleAuthor Zavalyuev A. S., Rogozhnikov D. A., Fomenko I. V., Lyakh S. I.
ArticleAuthorData

Pokrovskiy POX Hub, Pokrovskiy Rudnik JSC, Blagoveshchensk, Russia:

A. S. Zavalyuev, Chief Engineer, e-mail: zavaluev-a@pokrmine.ru

 

Laboratory of Advanced Technologies in Non-ferrous and Ferrous Metals Raw Materials Processing at the Institute of New Materials and Technologies, Ural Federal University named after the First President of Russia B. N. Yeltsin, Yekaterinburg, Russia:

D. A. Rogozhnikov, Head of the Laboratory, Doctor of Technical Sciences, e-mail: darogozhnikov@yandex.ru

 

R&D Centre for Hydrometallurgy LLC, Saint Petersburg, Russia:
I. V. Fomenko, General Director, Candidate of Technical Sciences, e-mail: fomenko-i@gidrometall.ru
S. I. Lyakh, Chief Engineer, Candidate of Technical Sciences, e-mail: lyakh-s@gidrometall.ru

Abstract

This paper describes the results of a laboratory study that looked at the conditioning of POX slurries produced by pressure oxidation (225 oC) of refractory gold flotation concentrates. The authors used a case study of sulphide concentrates produced as a result of flotation of refractory gold ores of the Malomyr and Pioner deposits to define the conditioning parameters applicable to POX slurries: i.e. temperature — 95 oC, duration — 2 to 4 hours. The above conditions help improve the quality of POX cakes before cyanidation so that the POX residue contained less sulphate sulphur and the cake weight could be lowered by 40–70%. The authors looked at the relationship between the conditioning parameters (60–95 oC with the duration of up to 7 hours) and the solids yield. They also examined how the above parameters influenced the transfer of the key components (i.e. iron, sulphur and arsenic) into liquid phase. In particular, the authors examined the process of conditioning POX cakes obtained from concentrates with the minimum (up to 2%) and high (8–10%) concentration of arsenic. The paper examines how the material composition of POX products tends to change after conditioning when dealing with sulphide concentrates. Conditioning was found to benefit the recovery of gold from POX cakes when dealing with high-arsenic concentrates. The gold particles in cakes can be encapsulated by mixed arsenate/sulphates of iron(III), which get dissolved during atmospheric conditioning, and the gold surface becomes available for cyanide solution. After conditioning, the share of cyanidable gold in POX cakes increases by 3.0 to 5.5%.

keywords Pressure oxidation, conditioning, flotation concentrate, POX residue, recovery of gold, cake output, mixed arsenate/sulphate of iron(III), base iron(III) sulphate
References

1. Naboyche nko S. S., Ni L. P., Shneerson Ya. M., Chugaev L. V. Autoclaving of non-ferrous metals. Yekaterinburg : GOU-UGTU-UPI, 2002. 940 p.
2. Thomas K . G., Cole A. P. Roasting developments — especially oxygenated roasting. Developments in Mineral Processing. 2005. Vol. 15. pp. 403–432.
3. Miller P., Brown A. Bacterial oxidation of refractory gold concentrates. Developments in Mineral Processing. 2005. Vol. 15. pp. 371–402.
4. Dunne R. Cha llenges and opportunities in the treatment of refractory gold ores. ALTA 2012 Gold Conference. Proceedings. 2012. pp. 1–15.

5. Rogozhnikov D . A., Rusalev R. E., Dizer O. A., Naboychenko S. S. Nitric acid loosening of rebellious sulphide concentrates containing precious metals. Tsvetnye Metally. 2018. No. 12. pp. 38–44. DOI: 10.17580/tsm.2018.12.05.
6. Adams M. D. Ad vances in gold ore processing, 1st ed. Developments in Mineral Processing. Vol. 15. Amsterdam : Elsevier, 2005. 1027 p.
7. Papangelakis V . G., Demopoulos G. P. Acid pressure oxidation of pyrite: reaction kinetics. Hydrometallurgy. 1991. Vol. 26. pp. 309–325.
8. Long H., Dixon D. G. A kinetic study of pressure oxidation of pyrite at high temperatures. EPD Congress. Proceedings. 1999. pp. 457–475.
9. Papangelakis V. G., Demopulos G. P. Acid pressure oxidation of arsenopyrite: Part 1. Reaction Chemistry. Canadian Metallurgical Quarterly. Vol. 29. No. 1. 1990. p. 1–12.
10. Gomez M. A., Bec ze L., Cutler J. N., Demopoulos G. P. Hydrothermal reaction chemistry and characterization of ferric arsenate phases precipitated from Fe2(SO4)3 – As2O5 – H2SO4 solutions. Hydrometallurgy. 2011. Vol. 107, Iss. 3-4. pp. 74–90.
11. Fleming С. A. Basic i ron sulfate – a potential killer in the processing of refractory gold concentrates by pressure oxidation. Minerals & Metallurgical Processing. 2010. Vol. 27, No. 2. pp. 81–88.
12. Lyakh S. I., Shneerson Ya. M., Klementiev M. V., Afanasiev A. V., Zavalyuev A. S. Pokrovskiy POX Hub: Start-up and a learning curve. Non-Ferrous Metals and Minerals – 2019: Proceedings of the 11th International Congress. 2019. pp. 918–927.
13. Zaicev P., Shneerson Y., Fed orov V., Zavaliuev A., Kudrin E. et al. Pokrovskiy pressure oxidation (POX) hub – from laboratory to commercial production. World Gold 2019. Conference Proceedings. Perth, Australia. pp. 504–518.
14. Zaicev P., Pleshkov M. A., Lapi n A. Y., Shneerson Y. Pressure oxidation process development for treating complex sulfide copper materials. Nickel – Cobalt – Copper Conference Proceedings of 7th Annual ALTA 2016. Perth, Australia. pp. 420–431.
15. Lyakh S. I., Bakhvalov S. S. Phase c omposition of autoclave oxidation products and its effect on gold coating. Tsvetnye Metally. 2021. No. 2. pp. 44–50. DOI: 10.17580/tsm.2021.02.06.
16. Shneerson Ya. M., Lapin A. Yu., Kabis ova A. S., Chugaev L. V. Hydrometallurgy Research & Development Centre – 12 years of successful operation. Tsvetnye Metally. 2020. No. 9. pp. 50–56.
17. Lyakh S. I., Klementiev M. V. A pilot pressure oxidation unit for conducting pilot tests with sulphide flotation concent rates of gold ores. Non-Ferrous Metals 2012: Proceedings of the 4th International Congress. Krasnoyarsk, 2012. pp. 584–589.
18. Machesky M. L., Andrade W. O., Rose A. W. Adsorption of gold(III)-chloride and gold(I)-thiosulfate anions by goethite. Geochimica et Cosmochimica Acta. 1991. Vol. 55, Iss. 3. pp. 769–776.
19. Vlassopoulos D., Wood S. A. Gold speciation in natural waters: Solubility and hydrolysis reactions of gold in aqueous solu tion. Geochimica et Cosmochimica Acta. 1990. Vol. 54, Iss. 1. pp. 3–12.

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