含锌炼钢炉粉高温焙烧脱氯的冶金动力学

Metallurgical Kinetics of Dechlorination of Zinc-riching in Steelmaking Dust Furnace Powder by High Temperture Roasting

在对炼钢粉尘物理、化学特性和脱氯反应机理分析的基础上,设计了炼钢炉粉高温焙烧脱氯动力学的积分研究方法,并对炼钢粉尘进行了750、800、900℃的高温焙烧脱氯热态试验。得出炼钢粉尘焙烧脱氯反应级数为1/2,进而计算出活化能、频率因子和氯元素脱出率随焙烧时间变化的函数,通过验证,平均误差为1.41%。研究结果表明:随着焙烧温度提高,粉尘脱氯效果越明显,粉尘脱氯合格所需的时间明显缩短。在900℃和950℃温度下焙烧,炼钢粉尘脱氯合格的时间分别为90min和32min。

Based on the analysis of physical and chemical properties and the dechlorination mechanism,an integral method for kinetics of de.chlorination in roasting steelmaking zinc-rich dust process was designed,and the thermal experiments were carried out at 750,800 and 900℃.The reaction order of dechlorination was 1/2,and the activation energy(E),frequency factor(A)were calculated too,so the function of dechlorination rate varying with roasting time was built up,whose average error was 1.41%.The results show that with the increase of tempera.ture,the dechlorination effect is more obvious,and the time for qualified dichlorination is obviously shortened,which are 90 minutes and 32 minutes respectively when roasted at temperatures of 900 and 950℃.