Journal
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
Volume 22, Issue 1, Pages 12-20Publisher
SPRINGER
DOI: 10.1007/s12613-015-1037-7
Keywords
fluidized beds; ferric oxide; iron ores; agglomeration; hydrogen; drag force
Categories
Funding
- National Natural Science Foundation of China [51234001]
- Major State Basic Research Development Program of China [2012CB720401]
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The fixed-gas drag force from a model calculation method that stabilizes the agitation capabilities of different gas ratios was used to explore the influence of temperature and hydrogen concentration on fluidizing duration, metallization ratio, utilization rate of reduction gas, and sticking behavior. Different hydrogen concentrations from 5vol% to 100vol% at 1073 and 1273 K were used while the drag force with the flow of N-2 and H-2 (N-2: 2 L center dot min(-1); H-2: 2 L center dot min(-1)) at 1073 K was chosen as the standard drag force. The metallization ratio, mean reduction rate, and utilization rate of reduction gas were observed to generally increase with increasing hydrogen concentration. Faster reduction rates and higher metallization ratios were obtained when the reduction temperature decreased from 1273 to 1073 K. A numerical relation among particle diameter, particle drag force, and fluidization state was plotted in a diagram by this model.
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