HAN Gui-hong
,
JIANG Tao
,
ZHANG Yuan-bo
,
HUANG Yan-fang
,
LI Guang-hui
钢铁研究学报(英文版)
By means of isothermal oxidation and chemical analysis, great importance was attached to the parameters that made effects on the oxidation degree of vanadium, titanium-bearing magnetite pellet in high-temperature processing (1073-1323 K). Based on the experimental data, oxidation kinetics of pellet was analyzed according to shrinking unreacted-core model subsequently. Experiment results display that the oxidation degree of pellet increases with increasing of oxidation time, oxidation temperature and oxygen content, as well as shrinking of pellet diameter. Under the condition of oxidation time 20 min, oxidation temperature 1223 K, oxygen content 15%, and pellet diameter 12 mm, oxidation degree of pellet reaches 92.92%. The analysis of oxidation kinetics indicates that oxidation process of pellet is controlled by chemical reaction with activation energy 68.64 kJ/mol at a relatively lower temperature (1073-1173 K). Oxidation process of pellet is mixed-controlled by chemistry reaction and diffusion with activation energy 39.66 kJ/mol in the temperature range of 1173-1273 K. When oxidation temperature is higher than 1273 K, the limited link of oxidation reaction is the diffusion control with the activation energy 20.85 kJ/mol. These results can serve as a reference to the production of vanadium, titanium-bearing magnetite pellet.
关键词:
vanadium
,
titanium-bearing magnetite
,
oxidation degree
,
pellet
,
shrinking unreacted-core model
,
oxidation kinetics
董进明
,
赵飞
,
张延玲
,
仇圣桃
,
干勇
钢铁
在实验室条件下，系统研究了1380℃下，钒在FeO-SiO2-MnO渣系与铁液间的分配行为。结果表明：钒的提取率、钒在渣-金两相的分配比、渣的钒容量随渣中SiO2的质量分数升高而降低。在SiO2的质量分数较低时，以上参数随MnO质量分数的增加而升高。而在SiO2的质量分数较高（>20%）时，随MnO质量分数的增加呈现先升高后降低的趋势。FeO-SiO2-MnO三元渣系中，SiO2的质量分数为10%～20%、MnO的质量分数为13%～5%时，以上参数达到最大值，且该区域对应着FeO-SiO2-MnO渣系熔点最低的区域。V2O3在 FeO-SiO2-MnO渣系中活度系数的数量级为10-6～10-7。
关键词:
钒
,
FeO-SiO2-MnO
,
slag system
,
distribution behavior
