高炉渣不同干法粒化工艺的对比试验

Comparative test on different dry granulation methods of blast furnace slag

为了改善高炉渣的干法粒化效果,确定合适的粒化工艺,通过对高炉渣进行多种方式的干法粒化试验,比较了不同粒化方式的特征及机制,结果表明,随着冷淬风量的增大,粒化渣向针状和丝状形态转变,传统风淬无法获得理想的颗粒尺寸和形态;采取气水混淬粒化可在较小的风量条件下改善液态渣的粒化效果,避免丝状渣的产生,可作为未来风淬法的发展方向;机械粒化效果优于风淬粒化,采取机械与风淬联合粒化,可获取最优的粒化和玻璃化效果。

In order to improve the dry granulation effect of blast furnace slag,and determine an appropriate granulation process,the characteristics and mechanism of different granulation methods were compared by means of dry granulation tests of the blast furnace slag.The results show that the form of granulated slag particles changes to needle-like and filamentous with the increasing of the air flow rate,and the traditional air-blow quenching technique cannot obtain the ideal granulation particles in size and form.In addition,adopting the air-water mixing quenching method can improve the granulation effect under a relatively small air volume,and the filamentous slag can be avoided,which can be regarded as the development direction of the air-blow quenching method.The mechanical granulation effect is better than that of air-blow quenching,and the optimal granulation as well as vitrification effect can be obtained in the combination of mechanical and air-blow quenching granulation.