Abstract
The thermodynamics of the MoS2-C-CaO system has been studied in order to understand the carbothermic reduction of molybdenite in the presence of CaO. Kinetic studies were also conducted with mixtures of MoS2+C+CaO in the temperature range of 900 °C 1200 °C. The reduction of MoS2 with carbon in the presence of lime proceeds through the direct oxidation of MoS2 by CaO to form intermediate molybdenum oxidized species, MoO2 and CaMoO4, which subsequently undergo reduction by CO to yield mixtures of Mo, Mo2C, and CaS. Complete conversion of MoS2 can be obtained at 1200 °C in less than 20 minutes for molar concentrations of MoS2:C:CaO=1:2:2. The kinetic model ln (1−X)=kt was used to determine the rate constants. The activation energy found for the temperature range studied was 218.8 kJ/mol.
Article PDF
Similar content being viewed by others
Explore related subjects
Discover the latest articles, news and stories from top researchers in related subjects.Avoid common mistakes on your manuscript.
References
W.G. Scholz, D.V. Doane, and G.A. Timmons: Trans. TMS-AIME, 1961, vol. 221, pp. 356–64.
P.A. Huska and C.W. Clump: Y & EC Process Design and Development, 1967, vol. 6 (2), pp. 239–44.
K.V. Nair, D.K. Bose, and G.C. Gupta: Min. Eng., 1978, vol. 30, pp. 291–96.
O.K. Mehra, D.K. Bose, and C.K. Gupta: Metall. Trans., 1973, vol. 4, pp. 691–94.
F.A. Schmidt, R.M. Bergman, O.N. Carlson, and H.A. Wilhelm: J. Met., 1971, vol. 23 (8), pp. 38–44.
T.K. Mukherjee and C.K. Gupta: Metall. Trans., 1974, vol. 5, pp. 707–13.
F. Habashi and R. Dugdale: Metall. Trans., 1973, vol. 4, pp. 1865–71.
T.R. Mankand and P.M. Prasad: Metall. Trans. B, 1982, vol. 13B, pp. 275–82.
C. Johnston and C.A. Pickles: Trans. Inst. Min. Metall., Sect. C, 1990, vol. 99, pp. 100–04.
A. Roine: Outokumpu HSC Software, 1994, ver. 2.0.
L.B. Pankratz, A.D. Mah, and S.W. Watson: U.S. Bureau of Mines Bull. 689, U.S. Government Printing Office, Washington, DC, 1987.
R. Padilla and H.Y. Sohn: Metall. Trans. B, 1979, vol. 10B, pp. 109–15.
Y.K. Rao and S.K. El-Rahaiby: Metall. Trans. B, 1985, vol. 5B, pp. 465–75.
Y.K. Rao: Metall Trans., 1971, vol. 2, pp. 1439–47.
Binary Alloy Phase Diagrams, 2nd ed., Thadeous B. Massalski, ed., ASM INTERNATIONAL, Materials Park, OH, 1990, vol. 1, p. 862.
Binary Alloy Phase Diagrams, 2nd ed., Thadeous B. Massalski, ed., ASM INTERNATIONAL, Materials Park, OH, 1990, vol. 3, p. 2661.
U.O. Igiehon, B.S. Terry, and P. Grieveson: Trans. Inst. Min. Metall. Sect. C, 1992, vol. 101, pp. 144–54.
A. Jha, U.O. Igiehon, and P. Grieveson: Scand. J. Metall., 1991, vol. 20, pp. 270–78.
U.O. Igiehon, B.S. Terry, and P. Grieveson: Trans. Inst. Min. Metall., Sect. C, 1994, vol. 103, pp. 41–53.
G.J.W. Kor: Metall. Trans. B, 1978, vol. 9B, pp. 307–11.
R.J. Carvalho, P.G. Quariyuasi, and J.C. D’abreu: Can. Metall. Q., 1994, vol. 33 (3), pp. 217–25.
B.P. Mohanty and K.A. Smith: Trans. Inst. Min. Metall., Sect. C, 1993, vol. 102, pp. 163–73.
Y.K. Rao: J. Met., 1983, vol. 35 (7), pp. 46–50.
A. Jha and P. Grieveson: Scand. J. Metall., 1992, vol. 21, pp. 127–37.
Y.K. Rao and B.P. Jalan: Metall. Trans., 1972, vol. 3, pp. 2465–77.
P.L. Walker, M. Shelef, and R.A. Anderson: Chemistry and Physics of Carbon, Marcel Dekker, New York, NY, 1968, vol. 4, pp. 287–301.
E.T. Turkdogan and J.V. Vinters: Carbon, 1970, vol. 8, pp. 39–53.
R.J. Fruehan: Metall. Trans. B, 1977, vol. 8B, pp. 279–86.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Padilla, R., Ruiz, M.C. & Sohn, H.Y. Reduction of molybdenite with carbon in the presence of lime. Metall Mater Trans B 28, 265–274 (1997). https://doi.org/10.1007/s11663-997-0093-4
Received:
Issue Date:
DOI: https://doi.org/10.1007/s11663-997-0093-4