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本文研制的模型能清楚地表明采用埋入喷吹,例如喷CaO基粉剂对铁水脱硫时,影响精炼动力学的一些重要因素。模型能够计算喷入熔体中粉剂在它上升时的反应(瞬时反应)与熔体同顶渣的反应(永久性接触反应)的名自作用;也能对“过脱硫”以及由此而产生的回硫进行定量的估算。模型应用到小型喷粉试验时,发现永久性接触反应和瞬时反应的作用大致是相等的。对所测定的熔体与上升气泡间反应速度常数同以前理论上所予报的速度常数基本上是相符合的。
The model developed in this paper clearly shows some important factors that affect refining kinetics when using in-situ injection, such as spraying CaO-based powders for desulphurization of hot metal. The model calculates the self-injection of the powder injected into the melt as it rises (instantaneous reaction) and the reaction of the melt with the slag (permanent contact reaction); it also gives rise to “over-desulfurization” and the resulting The sulfur back to quantitative estimates. When the model was applied to a small dusting test, it was found that the effects of the permanent contact reaction and the transient reaction were approximately equal. The measured reaction rate constant between the melt and the ascending bubble is basically in agreement with the previously reported velocity constant.