Investigation on Electro oxidation of Molybdenite Concentrate and Reduction in Energy Consumption

Document Type : Research Article

Authors

Research Lab for Advanced Separation Processes, Department of Chemical Engineering, Iran University of Science and Technology, P.O. Box 16846-13114 Tehran, I.R. IRAN

Abstract

In this research, dissolution of molybdenite through electro-oxidation of molybdenite concentrate in alkaline electrolyte solution was investigated. Effect of various parameters, including operating potential, liquid to solid ratio, NaCl concentration and distance between electrodes on the dissolution of molybdenite and the consumed electric energy within the electrochemical cell was studied. The results show that, dissolution of molybdenite was increased by increasing operating potential, liquid to solid ratio and NaCl concentration. The same was increased by increasing the distance between electrodes up to 10 mm, while for further distances the latter decreased. The energy consumption increased by increasing operating potential, liquid to solid ratio, and the distance between electrodes. The consumed energy also decreased by increasing NaCl concentration up to 100 g/L, while for further salt concentrations the latter increased. At optimum conditions including operating potential of 3 V, liquid to solid ratio of 200 mL/g, NaCl concentration of 100 g/L, distance between electrodes of 10 mm, and a period of 4 hours operation, the efficiency of molybdenum recovery and energy consumption were 70.41% and 5.56 kWh, respectively, per kilogram of molybdenite concentrate.

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References

[1] Mounsey D.M., "Factors Influencing the Recovery of Molybdenum During the Hypochlorite Leaching of Low Grade Molybdenite-Copper Concentrates", PhD Diss., University of British Columbia, 1979.
[2] Henrie T., Lindstrom R., Scheiner B., "Electro-oxidative Method for the Recovery of Molybdenum from Sulfide Ores", U.S. Patent 3,849,265, Issued November 19, (1974).
[3] Cao Z.F., Zhong h., Liu G-Y, Fu J.G., Wen Z.Q., Wang Sh., Electric-Oxidation Extraction of Molybdenite Concentrate in Alkaline NaCl Electrolyte, Journal of Central South University of Technology, 17, 480-484 (2010).
[4] 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(1): 2-6 (2009).
[5] Darjaa T., Okabe T., Waseda Y., Umetsu Y., Electro-Oxidation of Molybdenum Concentrate in Sodium Chloride Solution, Shigen-to-Sozai, 115(10): 755-761 (1999).
[6] Ketcham, J., Enzo L. Coltrinari, Wayne W. Hazen. Pressure Oxidation Process for the Production of Molybdenum Trioxide from Molybdenite, U.S. Patent 6149883, Issued May 2, (1996).
[7] Ashraf M., Hydrometallurgical Recovery of Molybdenum from Egyptian Qattar Molybdenite Concentrate, Physicochem. Probl. Miner. Process, 47: 105-112 (2011).
[8] Youcai, Liu, Zhong Hong, Cao Zhanfang, Molybdenum Removal from Copper Ore Concentrate by Sodium Hypochlorite Leaching, Mining Science and Technology (China), 21(1): 61-64  (2011).
[9] Zamani Askari M.A., Hiroyoshi N., Tsunekawa M., Vaghar R., Oliazadeh M., Bioleaching of Sarcheshmeh Molybdenite Concentrate for Extraction of Rhenium, Hydrometallurgy, 80(1): 23-31 (2005). 
[10] CAO, Zhan-fang, Hong Zhong, Zhen-qian WEN, Jian-gang FU, and Na Chen. Ultrasonic Electro-oxidation Process of Molybdenite Concentrate, The Chinese Journal of Process Engineering, 8(5): 926-931 (2008).
[11] Gupta C.K., "Extractive Metallurgy of Molybdenum", CRC Press, (1992).
[12] Cao, Zhan-fang, Hong Zhong, Guang-yi Liu, Yun-ren Qiu, Shuai Wang., Molybdenum Extraction from Molybdenite Concentrate in NaCl Electrolyte, Journal of the Taiwan Institute of Chemical Engineers, 41(3): 338-343 (2010).
[13] Zhan‐fang, Cao, Zhong Hong, Liu Guang‐yi, Fu Jian‐gang, Wang Shuai, and Qiu Yun‐ren. Electric‐Oxidation Kinetics of Molybdenite Concentrate in Acidic NaCl Solution, The Canadian Journal of Chemical Engineering, 87(6): 939-944 (2009).
]14[ وقار، رامز، "هیدرومتالورژی"، شرکت ملی صنایع مس ایران، دانشگاه تهران، تهران، (1378).

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