摘要
通过对钢液钙处理脱氧脱硫过程动力学的研究发现,当钙粒以喂线的形式注入钢水中时,一部分钙溶解,另一部分变为钙气泡,气泡在上浮的过程中与钢液中的氧、硫反应.钙粒的粒径越大,气化后的气泡在钢液中的停留时间和平均上浮速率就越大,脱氧脱硫的传质系数越小;在炼钢温度范围内,上浮速率及停留时间与钢液温度几乎没有关系,但传质系数随温度的增加而增加;随着钢液中氧、硫含量的增加,钙粒的最佳粒径增加;在一定的钢液深度和一定的氧、硫含量时,钙脱氧脱硫的利用率随其粒径的增加而减小;在温度为1 823 K、钢液中硫的质量分数为0.012%以及钢水包的深度为3 m情况下,当Ca的粒径小于0.002 m时,理论上Ca全部转化;当Ca的粒径在0.002～0.003 m时,钙的转化率为84.4%.
Based on a dynamical research on deoxidation and desulfurization of molten steel with calcium treatment, it is found that when solid calcium particles are fed into molten steel, some dissolve and the others become bubbles reacting with oxygen and sulfur. The bigger the diameter of the calcium particle is, the bigger the residenee time and average flotation speed of the bubble in molten steel are, and the less the mass transfer coefficients of deoxidation and desulfurization are. The residence time and flotation speed have hardly relationship with temperature in the steelmaking temperature range, but the mass transfer coefficient becomes large with increasing temperature. With increasing the contents of oxygen and sulfur in molten steel, the optimal diameter of calcium particles enlarges. The usage of calcium decreases with increasing particle size at a given depth of molten steel and oxygen and sulfur contents. Calcium particles of less than 0. 002 m in diameter will be wholly utilized under the condition of the temperature of 1823 K, the mass fraction of [ S] of 0.012 % and the depth of molten steel of 3 m. The conversion rate of calcium is 84.4 % when the particle diameter is in the range of 0. 002 to 0.003 m.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2009年第6期690-695,700,共7页
Journal of University of Science and Technology Beijing
关键词
钙处理
脱氧
脱硫
动力学
最佳粒径
calcium treatment
deoxidation
desulfurization
kinetics
optimal particle size
