气淬法粒化高炉渣实验研究

为了有效利用高炉渣余热，提高炉渣附加值，采用干式处理方法——气淬法，对高炉渣进行粒化，研究碱度和喷吹气体压力对成珠率、渣珠平均直径和粒径分布的影响规律.结果表明:成珠率随碱度的增加呈先增加后降低的趋势，碱度1.2时获得最高成珠率;渣珠的平均直径随碱度的增加先减小后增大，碱度超过1.2后，平均粒径显著增大;随喷吹压力的增加，成珠率呈先增加后减小之后又增加的趋势，压力为0.2MPa时成珠率最高;渣珠平均直径基本呈逐渐减小趋势并且减小趋势变缓;渣珠粒径集中分布在1~2.5mm之间，基本呈正态分布，分布较均匀.

Experimental Study on Granulation of Blast Furnace Slag by Gas Quenching

To effectively utilize waste heat from blast furnace slag(BFS)and increase the additional value of slag， the BFS is granulated using the dry treatment(gas quenching) method. The effects of basicity and nozzle pressure on bead formation rate， mean diameter and particle size distribution of slag beads are studied. The results show that with the increases of basicity， the bead formation rate firstly increases up to the highest rate at the basicity of 1.2 and then decreases. The mean diameter firstly decreases and then increases with the basicity， especially， when the basicity is over 1.2. With the nozzle pressure increasing， the bead formation rate firstly increases， followed by a drop and then raise again. The bead formation rate reaches the highest value at the pressure of 0.2MPa. The mean diameter of the slag beads decreases gradually and the decreasing tendency slows down when the pressure is larger than 0.3MPa. The particle size distribution of slag beads mainly ranges in 1~2.5mm， satisfying the Gaussian distribution basically.