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Title: |
Effect of Mechanical Activation of Carbon on the Reduction of the Iron Ore Containing Niobium under Low Temperature Thermodynamics and kinetics analysis |
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Source: |
The Second China Energy Scientist Forum (CESF 2010 E-BOOK)
(pp 394-399)
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Author(s): |
chaoke Bulin, Institute of mining and metallurgy Inner Mongolia University of science and technology, / key laboratory of high-efficiency utilization of rare earth and niobium for Bayan Obo resource, Bao tou, 014010, China
Bangwen Zhang, Institute of mining and metallurgy Inner Mongolia University of science and technology, / key laboratory of high-efficiency utilization of rare earth and niobium for Bayan Obo resource, Bao tou, 014010, China
Baowei Li, Institute of mining and metallurgy Inner Mongolia University of science and technology, / key laboratory of high-efficiency utilization of rare earth and niobium for Bayan Obo resource, Bao tou, 014010, China |
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Abstract: |
For the purpose of lowering the reaction temperature, the impact of mechanical activation on the reduction of the iron ore containing niobium was studied by the non-isothermal gravimetric analysis, and the thermodynamics and kinetics concerned was theoretically analyzed. Through ball milling, the intrinsic stratiform structure of the graphite as reducing agent was gradually destroyed, the resultant particles became finer, and specific surface area was increased conspicuously. After 120min for ball milling, the stratiform structure of the graphite was completely destroyed, the fine particles were agglomerated considerably. The TG-DSC curve and kinetic calculation indicated that mechanical activation of the carbon has little impact on the first stage of the reaction, the apparent activation energy of the reaction using milled graphite obtained respectively under 60min, 90min and 120min were 120.07, 125.97, 113.28 KJ/mol. Mechanical activation made the second stage reaction occur under a lower temperature, the corresponding apparent activation energy were 143.01, 90.68 and 87.44KJ/mol, respectively. This ascribes to the decrease of starting temperature of the Boudouard reaction, which lead to the marked reduction of apparent activation energy of the second stage reaction. The results from TG and DSC analysis and kinetic simulation conform to the theoretical analysis.
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