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Mechanism for the Reduction of Oxides in Copper-Smelting Slag under Blowing with CO–CO2 Gas Mixtures

  • METALLURGY OF NONFERROUS METALS
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Abstract

A mechanism is proposed for the joint reduction of oxides from multicomponent copper-smelting slag when they are blown with CO–CO2 gas mixtures and an algorithm is developed for its implementation in the form of a mathematical model. The first feature of the proposed mechanism is that the total rate of the overall reduction process is determined by CO consumption in the course of its interaction with oxygen ions formed owing to the dissociation of slag oxides. The second feature is that the equilibrium between the slag, alloy, and gas phase is achieved in accordance with the oxidation potential of the system occurring at each moment of time. It is shown that there is a satisfactory agreement between the calculated and experimental data obtained in the course of the reduction of the industrial copper-smelting slag at a temperature of 1300°C and at a ratio of CO/CO2 = 4, 6, and 156. In this case, a first-order kinetic equation is valid with respect to the difference between the initial and equilibrium CO content in the gas phase. A generalized rate constant for the reduction of multicomponent slag has been calculated amounting to k = 2.6 × 10–7 molCO/(cm2 s%) at a temperature of 1300°С. It is shown that, under the reduction of industrial multicomponent slag, the reduction rates for copper oxide and magnetite are rather high, being close to the maximum value at the very beginning of the slag blowing with the reducing gas. At the same time, the reduction rates for ferrous oxide and for the oxides of zinc and lead in the first minutes of the process are insignificant and exhibit a gradual increase before reaching a maximum, after which they again decrease almost to zero values as the system approaches the equilibrium between the supplied gas and the melt. In general, the reduction rate of oxides decreases when the equilibrium between the initial gas and the liquid phase is approached, and this should be taken into account when organizing the processes of continuous slag depletion.

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REFERENCES

  1. Komkov, A.A. and Kamkin, R.I., The behavior of copper and impurities during bubbling of copper-smelting slags with CO-CO2 gas mixture, Tsvetn. Met., 2011, no. 6, pp. 26–31.

  2. Romenets, V.A., Valavin, V.S., Usachev, A.B., Karabasov, Yu.S., and Balasanov, A.V., ROMELT Process, Moscow: MISIS, 2005.

    Google Scholar 

  3. Min, D.J., Han, J.W., and Chung, W.S., A study of the reduction rate of FeO in slag by solid carbon, Metal. Mater. Trans. B, 1999, vol. 30, pp. 772–775.

    Article  Google Scholar 

  4. Parra, R., Wilkomirsky, I., and Allibert, M., Direct reduction of copper–iron–silicon oxide melts, in Proc. Int. Conf. “Copper 99 – Cobre 99” (Phoenix, Oct. 10–13 1999), Warrendale: TMS, 1999, vol. 4, pp. 553–570.

  5. Halder, S. and Fruehan, R.J., Reduction of iron-oxide-carbon composites: pt. 1. Estimation of the rate constants, Metal. Mater. Trans. B, 2008, vol. 39, pp. 784–795.

    Article  Google Scholar 

  6. Corbari, R., Matsuura, H., Halder, S., Walker, M., and Fruehan, R.J., Foaming and the rate of the carbon–iron oxide reaction in slag, Metal. Mater. Trans. B, 2009, vol. 40, pp. 772–775.

    Article  Google Scholar 

  7. Madej, P. and Kucharski, M., Influence of temperature on the rate of copper recovery from the slag of the flash direct-to-blister process by a solid carbon reducer, Arch. Metal. Mater., 2015, vol. 60, pp. 1663–1671.

    Article  CAS  Google Scholar 

  8. Hayes, P.C., Okongwu, D.A., and Togyri, J.M., Some observation of the reaction between molten oxides and solid carbon, Can. Metal. Quart., 1995, vol. 34, pp. 27–36.

    Article  CAS  Google Scholar 

  9. Warczok, A. and Utigard, T.A., Fayalite slag reduction by solid graphite, Can. Metal. Quart., 1998, vol. 37, pp. 27–39.

    Article  CAS  Google Scholar 

  10. Huaiwei, Z., Xiaoyan, S., Bo, Z., and Xin, H., Reduction of molten copper slags with mixed CO–C4–Ar gas, Metal. Mater. Trans. B, 2014, vol. 45, pp. 582–589.

    Article  Google Scholar 

  11. Hu, X., Matsuura, H., and Tsukihashi, F., Interfacial reaction between CO2–CO gas and molten iron oxide containing P2O5, Metal. Mater. Trans. B, 2006, vol. 37, pp. 395–401.

    Article  Google Scholar 

  12. Barati, M. and Coley, K.S., Kinetics of CO–CO2 reaction with CaO–SiO2–FeOx melts, Metal. Mater. Trans. B, 2005, vol. 36, pp. 169–178.

    Article  Google Scholar 

  13. Li, Y. and Ratchev, I.P., Rate of interfacial reaction between molten CaO–SiO2–Al2O3–FexO and CO–CO2, Metal. Mater. Trans. B, 2002, vol. 33, pp. 651–660.

    Article  Google Scholar 

  14. Utigard, T., Sanchez, G., Manriquez, J., Luraschi, A., Diaz, C., Cordero, D., and Almendras, E., Reduction kinetics of liquid iron oxide-containing slags by carbon monoxide, Metal. Mater. Trans. B, 1997, vol. 28, pp. 821–826.

    Article  Google Scholar 

  15. Xie, D. and Belton, G.R., Kinetics of reduction of ferric iron in Fe2O3–CaO–SiO2–Al2O3 slags under argon, CO–CO2, or H2–H2O, Metal. Mater. Trans. B, 2003, vol. 34, pp. 225–234.

    Article  Google Scholar 

  16. Sorokin, M.L., Andryushechkin, N.A., and Nikolaev, A.G., Thermodynamics of the Cu-Fe system, Izv. Vyssh. Uchebn. Zaved.,Tsvetn. Metall., 1996, vol. 6, pp. 10–14.

    Google Scholar 

  17. Ladygo, E.A., Copper and nickel distribution patterns between the depleting melt products in reducing conditions, Extended Abstract of Cand. Sci. (Eng.) Dissertation, Moscow: MISIS, 2003.

  18. Cockcroft, S.L., Richards, G.G., and Brimacombe, J.K., Mathematical model of lead behaviour in the zinc slag fuming process, Can. Metal. Quart., 1988, vol. 27, pp. 27–40.

    Article  CAS  Google Scholar 

  19. Vanyukov, A.V., Bystrov, V.P., Vaskevich, A.D., Bruek, V.N., Zaitsev, V.Ya., Kirillin, I.I., Komkov, A.A., Mantsevich, N.M., Miklin, N.A., Sorokin, M.L., Fedorov, A.N., Tsesarsky, V.S., and Shubsky, A.G., Smelting in the Liquid Bath, Moscow: Metallurgiya, 1988.

    Google Scholar 

  20. Vaskevich, A.D., Sorokin, M.L., and Kaplan, V.A., General thermodynamic model of copper solubility in slags, Tsvetn. Met., 1982, vol. 10, pp. 22–26.

    Google Scholar 

  21. Komkov, A.A. and Vaskevich, A.D., Model of the biphasic gas-liquid flow, Izv. Akad. Nauk USSR.Met., 1989, vol. 6, pp. 24–29.

    Google Scholar 

  22. Komkov, A.A., Kamkin, R.I., Kuznetsov, A.V., and Karyaev, V.I., Specifics of copper recovery from the slags during reducing in bubbling conditions, Tsvetn. Met., 2018, vol. 11, pp. 21–26.

    Article  Google Scholar 

  23. Thermodynamic database FactSage. http:// www.factsage.com. Cited 17.02.2018.

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Authors and Affiliations

  1. National Research Technological University “MISiS”, 119991, Moscow, Russia

    A. A. Komkov

  2. OOO BASF, 125167, Moscow, Russia

    R. I. Kamkin

Authors
  1. A. A. Komkov
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  2. R. I. Kamkin
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Correspondence to A. A. Komkov or R. I. Kamkin.

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Translated by O. Polyakov

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Komkov, A.A., Kamkin, R.I. Mechanism for the Reduction of Oxides in Copper-Smelting Slag under Blowing with CO–CO2 Gas Mixtures. Russ. J. Non-ferrous Metals 61, 57–64 (2020). https://doi.org/10.3103/S106782122001006X

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