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PROCESSING AND COMPLEX USAGE OF MINERAL RAW MATERIALS
ArticleName Stage-activation leaching of oxidized copper–gold ore: Theory and technology
DOI 10.17580/em.2020.01.10
ArticleAuthor Rasskazova A. V., Sekisov A. G., Kirilchuk A. G., Vasyanovich Yu. A.
ArticleAuthorData

Khabarovsk Federal Research Center, Far East Branch, Russian Academy of Sciences, Khabarovsk, Russia:

Rasskazova A. V., Senior Researcher, Candidate of Engineering Sciences
Sekisov A. G., Acting Director, Doctor of Engineering Sciences, sekisovag@mail.ru
Kirilchuk A. G., Post-Graduate Student

Far Eastern Federal University, Vladivostok, Russia:

Vasyanovich Yu. A., Professor, Doctor of Engineering Sciences

Abstract

The article emphasizes the urgent need of heap leaching in the current geotechnical conditions. The application prospects for heap leaching are connected with preliminary oxidation of refractory ore. Another important requirement is geo-engineering typification of ore through geotechnical mapping. An alternative of cyanide in gold leaching is chlorine compounds. The article describes the theory of formation of active chlorine–oxygen complexes using electrochemical and photochemical effects. Iron acts as a catalyst of gold complexing by means of change in the oxidation rate +3/+2. The tests of agitation leaching are carried out on oxidized copper–porphyry–gold ore from the Malmyzh deposit. Efficiency of the best reagent scheme is proved by the results of percolation leaching. The laboratory experiment included primary processing of ore in peroxide–sulfuric solution prepared by electrochemical and photochemical treatment. After diffusion oxidation during ageing of treated samples for three days, the samples were irrigated with active hypochlorite–chloride solution for 15 days. The experiment proved recoverability of gold at a rate of 92–93% and copper at a rate of 55–60% without capital input and at minimized operating cost. The new-developed circuit of heap leaching includes layer-by-layer stockpiling. Selectivity of heap leaching is ensured by treatment of layers of qualitatively different ore types and grades by solutions of different reagents, at certain concentrations and in certain hydrodynamic modes of irrigation.

keywords Copper–porphyry–gold ore, oxidized ore, leaching, geotechnical mapping, stockpiling, electro-photochemical activation, preparatory oxidation, reagents, peroxide–sulfuric solutions, hypochlorite– chloride leaching
References

1. Liipo J., Hicks M., Takalo V.-P., Remes A., Talikka M., Khizanishvili S., Natsvlishvili M. Geometallurgical characterization of South Georgian complex copper-gold ores. The Journal of the Southern African Institute of Mining and Metallurgy. 2019. Vol. 119, Iss. 4. pp. 333–338.
2. Kryukov V. G., Lavrik N. A., Litvinova N. M., Stepanova V. F. Typomorphic minerals oxidation zone of gold-copper porphyry ore of the Malmyzh deposit (Svoboda). Georesources. 2019. Vol. 21, Iss. 3. pp. 91–98.
3. Sekisov A. G., Ivanov V. V., Rasskazova A. V., Ignatyev E. K. Geochemical features and geotechnical investigation of oxidized zone in the Malmyzh copper–gold ore deposit. Gornyi Zhurnal. 2018. No. 10. pp. 30–35. DOI: 10.17580/gzh.2018.10.05
4. Velásquez-Yévenes L., Torres D., Toro N. Leaching of chalcopyrite ore agglomerated with high chloride concentration and high curing periods. Hydrometallurgy. 2018. Vol. 181. pp. 215–220.
5. Ofori-Sarpong G., Osseo-Asare K. Preg-robbing of gold from cyanide and non-cyanide complexes: Effect of fungi pretreatment of carbonaceous matter. International Journal of Mineral Processing. 2013. Vol. 119. pp. 27–33.
6. Adams M. D. Advances in Gold Ore Processing. Series: Developments in Mineral Processing. Amsterdam : Elsevier, 2005. Vol. 15. 1076 p.
7. Hasab M. G., Rashchi F., Raygan S. Chloride-hypochlorite oxidation and leaching of refractory sulfide gold concentrate. Physicochemical Problems of Minerals Processing. 2013. Vol. 49, Iss. 1. pp. 61–70.
8. Mohammadnejad S., Provis J. L., Van Deventer J. S. J. The effect of grinding mechanism on the preg-robbing of gold onto quartz. International Journal of Mineral Processing. 2014. Vol. 128. pp. 1–5.
9. Santiago R. C. C., Ladeira A. C. Q. Reduction of preg-robbing activity of carbonaceous gold ores with the utilization of surface blinding additives. Minerals Engineering. 2019. Vol. 131. pp. 313–320.
10. Ahtiainen R., Lundström M. Cyanide-free gold leaching in exceptionally mild chloride solutions. Journal of Cleaner Production. 2019. Vol. 234. pp. 9–17.
11. Voeikov V. L . Key role of stable nonequilibrium state of aqueous systems in bioenergetics. Russian Journal of General Chemistry. 2011. Vol. 81, No. 1. pp. 209–219.
12. Sekisov A. G., Lavrov A. Yu., Rasskazova A. V. Photochemical and electrochemical processes in geotechnology. Chita : Zabaykalskiy gosudarstvennyi universitet, 2018. 305 p.
13. Xiaobo Min, Hitoshi Watanabe, Yasushi Takasaki, Takahiko Okura, Muneyuki Tamura et al. Copper Leaching Behavior of Iron-Oxide Hosted Copper-Gold Ore in Sulfuric Acid Medium. Materials Transactions. 2008. Vol. 49, No. 11. pp. 2611–2617.
14. Ivanov V. V., Kononov V. V., Ignatiev E. K. Mineralogical and geochemical features of mineralization in metasomatic deposits of the Malmyzh copper–gold belt (Low Amur Region). Tectonics, deep structure and minerageny of East Asia : Contributions of the 8th All-Russia Conference in memory of Academician Yu. A. Kosygin. Khabarovsk : ITiG im. Yu. A. Kosygina DVO RAN, 2013. pp. 258–261.
15. Sekisov A. G., Rasskazova A. V. Method of leaching gold from refractory ores. Patent RF, No. 2647961. Applied: 09.06.2017. Published: 21.03.2018. Bulletin No. 9.

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