Kinetics of thermal decomposition of hydrated minerals associated with hematite ore in a fluidized bed reactor

P. C. Beuria, S. K. Biswal, B. K. Mishra, G. G. Roy

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P. C. Beuria, S. K. Biswal, B. K. Mishra, and G. G. Roy, Kinetics of thermal decomposition of hydrated minerals associated with hematite ore in a fluidized bed reactor, Int. J. Miner. Metall. Mater., 24(2017), No. 3, pp.229-239. https://dx.doi.org/10.1007/s12613-017-1400-y
P. C. Beuria, S. K. Biswal, B. K. Mishra, and G. G. Roy, Kinetics of thermal decomposition of hydrated minerals associated with hematite ore in a fluidized bed reactor, Int. J. Miner. Metall. Mater., 24(2017), No. 3, pp.229-239. https://dx.doi.org/10.1007/s12613-017-1400-y
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研究论文

Kinetics of thermal decomposition of hydrated minerals associated with hematite ore in a fluidized bed reactor

  • Institute of Minerals and Materials Technology, Council of Scientific & Industrial Research, Bhubaneswar-751013, India

  • Indian Institute of Technology, Kharagpur-721302, India

    通信作者:

    P. C. Beuria E-mail: pcbeuria@immt.res.in

中文摘要

The kinetics of removal of loss on ignition (LOI) by thermal decomposition of hydrated minerals present in natural iron ores (i.e., kaolinite, gibbsite, and goethite) was investigated in a laboratory-scale vertical fluidized bed reactor (FBR) using isothermal methods of kinetic analysis. Experiments in the FBR in batch processes were carried out at different temperatures (300 to 1200℃) and residence time (1 to 30 min) for four different iron ore samples with various LOIs (2.34wt% to 9.83wt%). The operating velocity was maintained in the range from 1.2 to 1.4 times the minimum fluidization velocity (Umf). We observed that, below a certain critical temperature, the FBR did not effectively reduce the LOI to a desired level even with increased residence time. The results of this study indicate that the LOI level could be reduced by 90% within 1 min of residence time at 1100℃. The kinetics for low-LOI samples (<6wt%) indicates two different reaction mechanisms in two temperature regimes. At lower temperatures (300 to 700℃), the kinetics is characterized by a lower activation energy (diffusion-controlled physical moisture removal), followed by a higher activation energy (chemically controlled removal of LOI). In the case of high-LOI samples, three different kinetics mechanisms prevail at different temperature regimes. At temperature up to 450℃, diffusion kinetics prevails (removal of physical moisture); at temperature from 450 to 650℃, chemical kinetics dominates during removal of matrix moisture. At temperatures greater than 650℃, nucleation and growth begins to influence the rate of removal of LOI.

 

Research Article

Kinetics of thermal decomposition of hydrated minerals associated with hematite ore in a fluidized bed reactor

Author Affilications

    • Institute of Minerals and Materials Technology, Council of Scientific & Industrial Research, Bhubaneswar-751013, India

    • Indian Institute of Technology, Kharagpur-721302, India

  • Received: 25 April 2016; Revised: 18 October 2016; Accepted: 19 October 2016;
The kinetics of removal of loss on ignition (LOI) by thermal decomposition of hydrated minerals present in natural iron ores (i.e., kaolinite, gibbsite, and goethite) was investigated in a laboratory-scale vertical fluidized bed reactor (FBR) using isothermal methods of kinetic analysis. Experiments in the FBR in batch processes were carried out at different temperatures (300 to 1200℃) and residence time (1 to 30 min) for four different iron ore samples with various LOIs (2.34wt% to 9.83wt%). The operating velocity was maintained in the range from 1.2 to 1.4 times the minimum fluidization velocity (Umf). We observed that, below a certain critical temperature, the FBR did not effectively reduce the LOI to a desired level even with increased residence time. The results of this study indicate that the LOI level could be reduced by 90% within 1 min of residence time at 1100℃. The kinetics for low-LOI samples (<6wt%) indicates two different reaction mechanisms in two temperature regimes. At lower temperatures (300 to 700℃), the kinetics is characterized by a lower activation energy (diffusion-controlled physical moisture removal), followed by a higher activation energy (chemically controlled removal of LOI). In the case of high-LOI samples, three different kinetics mechanisms prevail at different temperature regimes. At temperature up to 450℃, diffusion kinetics prevails (removal of physical moisture); at temperature from 450 to 650℃, chemical kinetics dominates during removal of matrix moisture. At temperatures greater than 650℃, nucleation and growth begins to influence the rate of removal of LOI.

 

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    B.K. Mishra, B. Das, S. Prakash, S.K. Das, S. K. Biswal, and P.S.R. Reddy, Issues relating characterization and beneficiation of low grade iron ore, Steelworld, November 2007, p. 34.

    S.K. Biswal, Utilization of low grade iron ore fines, slimes and tailings by physical beneficiation to minimize the waste generation, J. Sustainable Planet, 1(2010), p. 46.

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    C.J. Goss, The kinetics and reaction mechanism of the goethite to hematite transformation, Mineral. Mag., 51(1987), p. 437.

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