Study on Mechanism of Molybdenum Concentrate Roasting

Lian Yong Wang; Jin Ling Dong; Jiu Ju Cai

doi:10.4028/www.scientific.net/AMR.455-456.60

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 455-456Study on Mechanism of Molybdenum Concentrate...

Study on Mechanism of Molybdenum Concentrate Roasting

Abstract:

Thermo gravimetric analyzer was used to investigate the thermo-gravimetric behavior and the exothermicity of molybdenum concentrate roasting. Roasting reaction mechanism of molybdenum concentrate was concluded with the double extrapolated method. Data processing and fitting was constructed with the integral methods of Costs-Redfern and Flynn-Wall-Ozawa, and roasting reaction kinetic parameters were proposed. The results showed that roasting reaction process of weight loss was divided into four stages, namely preheated drying stage, diffusion stage, rapid reaction stage and deep oxidation stage respectively. The heat released from the oxidation reaction mostly concentrated in the rapid reaction stage, the main product of this stage was MoO₂, and the activation energy was 227.7kJ/mol. The main product of deep oxidation stage was MoO₃. When the temperature was about 600°C, the formation rate of MoO₃ was maximum, less heat released at this stage and the activation energy was 163.2kJ/mol.

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Periodical:

Advanced Materials Research (Volumes 455-456)

Pages:

60-64

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.455-456.60

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Online since:

January 2012

Authors:

Lian Yong Wang, Jin Ling Dong, Jiu Ju Cai

Keywords:

Double Extrapolation Method, Mechanism Model, Molybdenum Concentrate, Oxidation Roasting

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References

[1] T.G. Xiang, Molybdenum Metallurgy, Changsha: Central South University Press, 2002, pp.1-10.

Google Scholar

[2] Rare Metal Editorial Board, Rare Metal Manual, Vol. 2. Beijing: Metallurgical Industry press, 1995, pp.34-40.

Google Scholar

[3] R.Z. Xu, Material Science of Powder Metallurgy Structure, Changsha: Central South University Press, 1998, pp.50-53.

Google Scholar

[4] Q.X. Zhang, Q.S. Zhao, Metallurgy of Tungsten and Molybdenum Beijing: Metallurgical Industry Press, 2005, pp.5-10.

Google Scholar

[5] H.F. Huang, Solution for Pollution and Waste of Molybdenum Concentrate Roasting, Ferroalloy, Vol. 1, p.33–37，january (2002).

Google Scholar

[6] H. X, Guo, Applied Chemical Industry Kinetics, Beijing: Chemical Industry Press, 2003, pp.1-10, 253-261.

Google Scholar

[7] J.M. Cai L.S. Bi, Precision of the Coats and Redfern Method for the Determination of the Activation Energy without Neglecting the Low-Temperature End of theTtemperature Intergral, Energy Fuels, Vol. 22, pp.2172-2174, April (1955).

DOI: 10.1021/ef8002125

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