Reduction kinetics of high grade rich ore fines in melt of HIsmelt process
The key technology of HIsmelt process is"deep injection of iron ore",but the kinetics of iron ore reduction in molten pool is unclear.In order to calculate the reduction conversion and conversion rate,the exhaust gas of reduction reaction was analyzed in real time by on-line gas detection analyzer.Furthermore,the influence of different factors on reduction reaction kinetics and activation energy was investigated.The results show that the smelting reduction time was shortened by 17.8％when the particle size of iron ore was decreased from 3-5 mm to 1-2 mm.And the larger surface area and faster heat transfer rate have accelerated its reduction rate.After the temperature increases,the maximum melting reduction conversion rate increases,and the time to reach the peak gradually shifts forward.The smelting reduction R0.5 value of iron ore increased from 1.388 9 × 10-2 s-1 to 2.083 3× 10-2 s-1 when w([C])content in melt increased from 1 wt.％to 4 wt.％,which significantly improves the smelting reduction rate of iron ore.The apparent activation energy of smelting reduction of this high-grade iron ore fines in Fe-C melt is 55.52 kJ/mol based on the fitting solution of iso-conversional method.
万方数据
维普
