粉剂熔化性对顶吹喷粉钢水脱磷动力学的影响

对悬挂式顶吹喷粉精炼的钢水脱磷速率进行了理论和实验研究．应用传质原理的双膜理论，分别考虑气粉流直接冲击钢水面的过渡相接触区和顶渣的稳定相接触区，建立了顶吹喷粉钢水精炼的动力学模型．考查了供粉强度和渣粉熔化特性对精炼速率的影响．结果表明，即使在渣粉熔点较低的情况下，稳定相接触区对整个精炼过程也有着重要的贡献．增加供粉强度可增加稳定相接触区反应所占的比例，但对过度相接触区无影响，降低渣粉熔点可显著提高过渡相接触区的精炼效率，从而提高整个精炼过程的速率．

Influence of Slag Powder Melting on Kinetics of Liquid Steel Dephosphorization by Powder Blowing

Rate of steel dephosphorization by slag powder blowing onto the surface of steel in an induction furnace was studied theoretically and experimentally. Based on the double-film theory of mass transfer, a kinetics model was developed for steel's refining by slag powder blowing. Both the area of transitory phase contact where the slag powder impact directly the steel surface and that of the permanent phase contact where top slag is in steady contact with steel are taken into account separately. Experimertal data were then used to fit and verify the model. The influence of blowing rate and melting behavior of slag powder on the refining process are discussed by the model. It is concluded that, even in the case of low powder melting point, the area of permanent phase contact has important contribution to the whole refining process. An increase in powder blowing rate can increaoc the refining portion of the permanert phase contact area, but has no effect on the area of transitory phase contact. Lowcring the melting points of the slag powder can greatly increace the refining rate of the transitory phase contact area, and thereby increase the efficiency of the overall process.