不锈钢冶炼渣铁浴熔融还原动力学实验研究

STUDY ON KINETICS OF SMELTING REDUCTION OF SLAG FROM STAINLESS STEELMAKING

通过10 kg级小型不锈钢冶炼渣熔融还原试验,研究了不锈钢废渣在1 500～1 650℃温度范围内的熔融还原动力学行为,认为还原反应体现在两个阶段:反应初期不锈钢废渣熔解为反应的控速环节;而反应后期界面处的化学反应演变为反应的控速环节。从整体熔融还原试验上看,不同阶段对炉渣组成有着不同的要求:反应初期需要降低熔渣熔点,能有效促进形成液态渣,以提高不锈钢渣的熔解速度;反应后期需合理调节炉渣流动性以加速熔融还原反应。故可以通过炉渣参数优化以求在保证终渣的残铬达到较高回收的前提下尽可能提高熔融还原的速率。

Kinetics of the stainless steel slag smelting reduction within 1 500 - 1 650℃ was studied. It was believed that reduction consisted of two parts ： smelting reduction which was controlled by stainless steel slag melting initially and the interface reaction. On the whole, different stages of the smelting reduction were of different requirements： decreasing of the melting point initially and increasing of the liquidity later could accelerate the smelting reaction so that optimization of slag could not only raise the recovery of chromium in slag but also accelerate the reaction rate of smelting reduction.