Leaching and Kinetic Modelling of Molybdenite Concentrate Using Hydrogen Peroxide in Sulfuric Acid Solution

Document Type : Research Article

Authors

Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, P.O. Box 15875-4413 Tehran, I.R. IRAN

Abstract

Leaching of molybdenite concentrate with hydrogen peroxide in sulfuric acid solution was investigated to determine the effects of reaction time, reaction temperature, H2O2 concentration, H2SO4 concentration, pulp density and rotation speed on molybdenum extraction and molybdenite dissolution kinetics, using the Taguchi method. From analysis of variance (ANOVA) for molybdenum extraction, the most significant factors were H2O2 concentration, pulp density and reaction temperature. The optimal factor levels to maximize extraction were determined. As the leaching process does not result in an ash layer, only chemically controlled kinetic model was applied. ANOVA for the reaction rate constant showed that H2O2 concentration made the greatest contribution to the model, and reaction time and temperature were also statistically significant factors. The reaction rate constant increased with increasing temperature and H2O2 concentration. The order of reaction with respect to H2O2 and activation energy for the dissolution were determined to be 1.21 and 46.5 kJ/mol, respectively, and a semi-empirical rate equation was derived.

Keywords

Main Subjects

References

[1] Kholmogorov A.G., Kononova O.N., Processing Mineral Raw Material in Siberia: Ores of Molybdenum, Tungsten, Lead and Gold, Hydrometallurgy, 76: 37- 54 (2004).
[2] Nair K.U., Sathiyamoorthy D., Bose D.K., Gupta C.K., Processing of Low-Grade Indian Molybdenite Concentrate by Chlorination in a Fluidised-Bed Reactor, International Journal of Mineral Processing, 23: 171-180 (1988).
[3] Singh S., Chetty M.K., Juneja J.M., Sehra J.C., Gupta C.K., Studies on the Processing of a Low Grade Molybdenite Concentrate by Lime Roasting, Minerals Engineering, 1: 337-342 (1988).
[4] Prasad P.M., Mankhand T.R., Rao P.S., Lime-Scavenged Reduction of Molybdenite, Minerals Engineering, 6: 857-871 (1993).
[5] Rao P.S., Prasad P.M., Direct Synthesis of Molycarbide by Molybdenite- Carbon Monoxide Reaction in the Presence of Lime, Materials Transactions JIM, 34: 1229-1233 (1993).
[6] Shah V.D., Rakhasia R.H, Sehra J.C., Recovery of Molybdenum as Molybdic Oxide from Rakha Molybdenite, India, by Soda-Ash Roasting, Mineral Processing and Extractive Metallurgy, 105: 199-203 (1996).
[7] Vizsolyi A., Peters E., Nitric Acid Leaching of Molybdenite Concentrates, Hydrometallurgy, 6: 103-119 (1980).
[8] Parsons G.J., Brimacombe J.K., Peters E., Computer Simulation of a Molybdenite Leaching Process Using Dilute Nitric Acid, Hydrometallurgy, 17: 133-154 (1987).
[9] Khoshnevisan A., Yoozbashizadeh H., Mozammel M., Sadrnezhaad S.K., Kinetics of Pressure Oxidative Leaching of Molybdenite Concentrate by Nitric Acid, Hydrometallurgy, 111: 52-57 (2012).
[10] Antonijević M.M., Pacović N.V., Investigation of Molybdenite Oxidation by Sodium Dichromate, Minerals Engineering, 5: 223-233 (1992).
[11] Cao Z.F, Zhong H., Qiu Z.H., Liu G.Y, Zhang W.X, A Novel Technology for Molybdenum Extraction from Molybdenite Concentrate, Hydrometallurgy, 99: 2-6 (2009).
[12] Bhappu R.R., Reynolds E.H., Stahmen W.S., “Studies on Hypochlorite Leaching of Molybdenite”, State Bureau of Mines & Mineral Resources, New Mexico Institute of Mining & Technology, (1963).
[13] Pistaccio L., Curutchet G., Donati E., Tedesco P., Analysis of Molybdenite Bioleaching by Thiobacillus-Ferrooxidans in the Absence of Iron-(II), Biotechnology Letters, 16: 189-194 (1994).
[14] Olson G.J., Clark T. R., Bioleaching of Molybdenite, Hydrometallurgy, 93: 10-15 (2008).
[15] Pecina T., Franco T., Castillo P., Orrantia E., Leaching of Zinc Concentrate in H2SO4 Solutions Containing H2O2 and Complexing Agents, Minerals Engineering, 21: 23-30 (2008).
[16] Khan K., Ali T., The Impact of Solvent Extraction on the Recovery of Molybdenum from Molybdenite Ore, Journal of the Chemical Society of Pakistan, 12: 316-321(1990).
[17] Cruywagen J.J., Mckay H.A.C., The Extraction of Molybdenum (VI) by Tri-n-butyl Phosphate, Journal of Inorganic and Nuclear Chemistry, 32: 255-265
(1970).
[18] Sato T., Watanabe H., Suzuki H., Liquid-Liquid Extraction of Molybdenum (VI) from Aqueous Acid Solutions by TBP and TOPO, Hydrometallurgy, 23: 297-308 (1990).
[19] Dai G.S., Xuan B.Y., Su Y.F., Separation of Tungsten and Molybdenum in Dilute Hydrochloric Acid Solution by Extraction with Sulfoxides, Hydrometallurgy, 13: 137-153 (1984).
[20] Des N.R., Naudi B., Bhattacharya S.N., Solvent Extraction Separation of Molybdenum and Tungsten Using Di(Zethy1 hexyl) Phosphonic Acid (HDEHP) as an Extractant, “Proceeding of International Solvent Extraction Conference”, (1983).

Files

Share

How to cite

Statistics