X.M. Yang
,
D.B. Huang
,
L. T. Kong
,
T.J. Yang
,
Y.S. Xie and D. G. Wang(Institute of Chemical Metallurgy
,
Chinese Academy of Sciences
,
Beijing 100080
,
China)(University of Science and Technology Beijing
,
Beijing 100083
,
China)
金属学报(英文版)
The rate of reducing Fet O in CaO-SiO2-Al2O3-Fet O slags with carbon saturated in molten iron has been determined in a graphite crucible in the temperature range of 1673-1773K. The effects of temperature, slag basicity and FetO content on the reduction rate have also been discussed. Test results show that the reduction rate increases with increasing temperature or FEtO concentration in slags, and the reduction rate has a parabolic relation with the simple basicity or optical basicity of slag, the maximum reduction rate being observed at around CaO/SiO2=1.5 of molten slags. The reduction reaction order is 1. 73 or 1.80, and the reduction activation energy is 299.9 or 295.9 kJ/mol in regard to Fet O weight content or Fet O activity calculated by using regular solution model, respectively. The reduction rate of CaO-SiO2-Al2 O3-Fet O slags with carbon saturated in molten iron is in the range of 0.32-3.48 mol-O/cm2·s.
关键词:
CaO-SiO_2-Al_2O_3-Fe_tO slags
,
null
,
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,
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X.M. Yang
,
Y.S. Xie and D.G. Wang (Institute of Chemical Metallurgy
,
The Chinese Academy of Sciences
,
Beijing 100080
,
China) D.B. Huang
,
T.J. Yang and L.T. Kong (University of Science and Technology Beijing
,
Beijing 100083
,
China)
金属学报(英文版)
The reduction behavior of iron ore pellets containing carbon under non-isothermal condition in the temperature range from 573 to 1373K has been investigated in a laboratory scale setup. The test results show that carbon content has no obvious effect on reduction degree of composite pellets (C/O mole ratio=1.0) by CO in the temperature range from 575 to 1373K under linear temperature-rising program; reduction degree of iron ore pellets containing carbon is larger in 90%CO-10%CO2 mixture than that of in 100%CO atmosphere or in 80%CO-20%CO2 mixture; the s type temperature-rising program has a better effect than that of linear one to increase the reduction degree; and reduction degree of slower linear temperature-rising program is greater than that of faster one, but the final reduction degrees, i.e., those at the highest temperature are about same for various CO partial pressures or temperature-rising programs. The kinetic analysis also shows that the reduction of iron ore-carbon composite pellets by CO or CO-CO2 mixture under non-isothermal condition should be controlled 6y surface reaction, and the apparent reduction activation energy changes with the reduction progress under various test conditions.
关键词:
iron ore pellet containing carbon
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null
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