高炉渣均质化行为及其粒化效果研究

Homogenization and Granulation Effect of Blast Furnace Slag

利用动态黏度实验法研究了高炉渣的均质化行为,构建熔渣调质过程动力学模型,同时对高炉渣均质化状态进行验证,并对最终粒化效果进行了分析。结果表明,均质化时间随调质剂添加量增加先减少后增加,添加量为15.43%时均质化时间最短;高炉渣粒度大于1.75 mm时,均质化时间明显增加;随炉渣温度升高,均质化时间逐渐缩短,通过与充分均质化高炉渣的成分及矿相进行对比,验证了高炉渣在黏度值达到稳定时已完成了均质化。粒化渣珠粒径主要位于1~2.5 mm,基本呈正态分布;高炉渣均质化处理后非晶相含量均高于85%,满足国家标准要求。

Base on the study on homogenization behavior of blast furnace slag(BFS)by dynamic viscosity experiment,a kinetic model was constructed for molten slag conditioning process.The homogenization state of BFS was verified and the final granulation effect was analyzed.It is found that the homogenization time becomes shorten first and then prolonged as the addition of conditioner increases,which is the shortest when an addition of conditioner is at an amount of 15.43%.As for BFS with grain size greater than 1.75 mm,the homogenization time increases obviously.As slag temperature increases,the homogenization time is gradually shortened.Based on the comparison with the composition and mineral phases of fully homogenized BFS,it is verified that homogenization is completed when viscosity value becomes stable.The granulated slag particles with size mainly in the range from 1 mm to 2.5 mm present approximately normal distribution,and the homogenized BFS has amorphous phase content higher than 85%,meeting the requirements in the national standard.