| Название |
Combined electrochemical sulfidization of refractory oxidized
copper ores |
| Реферат |
This study summarizes the research results for electrochemical preparation for flotation of refractory oxidized copper ore from the Udokan deposit, containing only 0.5 % total copper by weight, with 90 % in the form of oxidized minerals. The electrolytic preparation method involves targeted conversion of chrysocolla, a refractory copper mineral, into a form that can be more easily separated by flotation. The research uses the established cathodic electrochemical reduction mechanisms for both chrysocolla and sodium sulfite under controlled electrochemical conditions to facilitate the preliminary electrochemical sulfidization of oxidized copper ores prior to flotation. The electrochemical preparation was carried out in a specially designed electrolyzer, where the oxidized copper ore slurry, combined with a sulfuric acid electrolyte, was loaded into the cathode space and subjected to electrolysis under intensive stirring. The slurry was then fed into a laboratory flotation machine. During cathodic polarization, the oxidized mineral surfaces are partially dissolved, exposing the copper. This is followed by copper reduction to an elemental state: when copper ions reach the cathode, they are transformed into solid copper metal, which then deposits onto the cathode surface. Concurrently, sulfite ions are reduced to elemental sulfur at the cathode. Due to their chemical affinity, the copper and sulfur chemically bond to form copper sulfide, a compound that is more easily recovered through flotation. A mathematical model was developed to predict copper recovery, indicating that a high recovery of 95.0 % can be achieved in the presence of a sodium sulfite sulfidizer. According to the calculations, under optimal conditions of electrochemical sulfidization of oxidized copper ore, copper recovery into concentrate can reach 95.4 %, surpassing the performance of direct flotation by 50 %.
This research was conducted under targeted funding contract IRN No. BR23991563 concluded between the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan and the Zh. Abishev Chemical and Metallurgical Institute.
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| Библиографический список |
1. Lapshin D. A., Prostakishin M. F., Zolotarev V. N., Khramtsova I. N. Development of technology of Udokan deposit ores processing. Part 1. Laboratory researches of definition of basic engineering solutions. Tsvetnye Metally. 2014. No. 8. pp. 14–19.
2. Lapshin D. A., Prostakishin M. F. Development of technology of processing of Udokan copper deposit ores. Part 2. Peculiarities of ore technological properties. Tsvetnye Metally. 2015. No. 2. pp. 14–19.
3. Bekturganov N. S. Technological and environmental aspects of complex processing of difficult-to-enrich mineral and man-made raw materials of Kazakhstan. Proc. of the International conference «Plaksin Readings – 2014». Almaty, September 16–19, 2014. pp. 9–12.
4. Senchenko A. E., Kulikov Yu. V., Aksenov A. V. Process characteristics of Udokan copper deposit ores, defining
the efficient processing flowsheet and prospective ways of the process improvement. Tsvetnye Metally. 2017. No. 10. pp. 14–17.
5. Grau R., Saari J., Maksimov I. I., Egorova V. G., Kuznetsova I. А. The Udokan deposit copper ores processing technology development studies. Obogashchenie Rud. 2018. No. 1. pp. 21–26.
6. Khalezov B. D. To the question of processing of ores of the Udokan field. Gornyi Informatsionno-analiticheskiy Byulleten'. 2014. No. 4. pp. 103–108.
7. Katkeeva G. L., Burkitseterkyzy G., Oskembekov I. M., Zhunusov E. M. On the prospects of using a modified sulfidizer in the processing of oxidized copper ores. Obogashchenie Rud. 2020. No. 3. pp. 38–42.
8. Denisov M. E., Rudnev B. P., Krylova L. N., Kuchmina Yu. S. Technology of processing of copper ore Udokan deposit with preliminary sulfuric acid leaching. Tsvetnaya Metallurgiya. 2014. No. 3. pp. 100–104.
9. Seredkin M., Zabolotsky A., Jeffress G. In-situ recovery, an alternative to conventional methods of mining: exploration, resource estimation, environmental issues, project evaluation and economics. Ore Geology Reviews. 2016. Vol. 79. pp. 500–514.
10. Sinclair L., Thompson J. In-situ leaching of copper: challenges and future prospects. Hydrometallurgy. 2015. Vol. 157. pp. 306–324.
11. Zhang Q., Wen S., Feng Q., Zhang S. Surface characterization of azurite modified with sodium sulfide and its response to flotation mechanism. Separation and Purification Technology. 2020. Vol. 242. DOI: 10.1016/j.seppur.2020.116760
12. Zhao Q., Liu W., Wei D., Wang W., Cui B., Liu W. Effect of copper ions on the flotation separation of chalcopyrite and molybdenite using sodium sulfide as a depressant. Minerals Engineering. 2018. Vol. 115. pp. 44–52.
13. Maleki H., Noaparast M., Chehreghani S., Mirmohammadi M. S., Rezaei A. Optimization of flotation of the Qaleh Zari mine oxidized copper ore sample by the sequential sulfidation approach using the response surface method technique. Rudarsko-Geolosko-Naftni Zbornik. 2023. Vol. 38, Iss. 1. pp. 59–68.
14. Brest K. K., Henock M. M., Guellord N., Kimpiab M., Kapiamba K. F. Statistical investigation of flotation parameters for copper recovery from sulfide flotation tailings. Results in Еngineering. 2021. Vol. 9. DOI: 10.1016/j.rineng.2021.100207
15. Bekturganov N. S., Katkeeva G. L., Oskembekov I. M., Akubaeva M. A. Sulfidization application during the processing of oxidized copper ores of Udokan deposit. Tsvetnye Metally. 2016. No. 9. pp. 22–27.
16. Boduen A. Ya., Fokina S. B., Petrov G. V., Andreev Yu. V. Ammonia autoclave technology for the processing of low-grade concentrates generated in flotation concentration of cupriferous sandstones. Obogashchenie Rud. 2019. No. 2. pp. 33–38.
17. Chanturiya V. А., Vaisberg L. A., Kozlov А. P. Promising trends in investigations aimed at all-round utilization of mineral raw materials. Obogashchenie Rud. 2014. No. 2. pp. 3–9
18. Chanturia V. A., Bunin I. Z., Ryazantseva M. V., Chanturia E. L., Khabarova I. A., Koporulina E. V., Anashkina N. E. Modification of structural, chemical and process properties of rare metal minerals under treatment by high-voltage nanosecond pulses. Journal of Mining Science. 2018. Vol. 53, Iss. 4. pp. 718–733.
19. Chanturia V. A., Chanturia E. L., Minenko V. G., Samusev A. L. Acid leaching process intensification for eudialyte concentrate based on energy effects. Obogashchenie Rud. 2019. No. 3. pp. 29–36.
20. Chanturia V. A., Vigdergauz V. E. Electrochemistry of sulfides. Theory and practice of flotation. Moscow: Publishing House «Ore and Metals», 2008. 272 p.
21. Dospaev М. М., Bayeshov A., Zhurinov M. Z., Zhumakanova A. S., Bayeshova A. K., Syzdykova B. B., Dospaev D. M., Kakenov K. S. Physical-and-chemical regularities of forming chrysocolla mineral in metasilicate solutions. News of the Аcademy of Sciences of the Republic of Kazakhstan. Series of Geology and Technical Sciences. 2018. No. 5. pp. 107–112.
22. Dospaev M. M., Syzdykova B. B., Figurinene I. V., Dospaev D. M. Hydrometallurgical production of monovalent copper sulfide powder by electrolysis in a sulfuric acid medium. Proc. of the scientific and practical conference with international participation and elements of the school of young scientists «Prospects for the development of metallurgy and mechanical engineering using completed fundamental research and R&D». Ekaterinburg, June 3–5, 2015. pp. 320–324.
23. Bayeshov A., Figurinene I. V., Dospaev M. M. Electrochemical synthesis of sulfur compounds. Karaganda: Glasir, 2017. 263 p.
24. Dausheva M. R., Songina O. A. Behavior of suspension of poorly soluble substances on electrodes. Uspekhi Khimii. 1973. Vol. 42, No. 2. pp. 323–342.
25. Malyshev V. P., Teleshev K. D., Nurmagambetova A. M. Destructibility and preservation of conglomerates. Almaty: Gylym, 2003. p. 122. |
