高炉熔渣机械离心粒化的关键技术

Key technique of mechanical centrifugal granulation of blast furnace slag

为了提高高炉熔渣机械离心粒化产物的质量,针对高炉熔渣离心粒化颗粒尺寸分布范围大、易产生丝状物等问题,进行了高炉熔渣离心粒化冷态实验可视化研究。实验结果表明:锯齿状边沿结构以及边沿表面加筋结构的粒化器可以保证在粒化过程中液膜分裂方式的相对稳定性,粒化液滴粒径小而均匀,其索特平均直径比普通平盘最多可减小0.7 mm;对于直径为150 mm的粒化器,当熔料温度大于130℃,体积流量为15~20 mL/s,转速为600~800 r/min时可有效减少丝状物的比例;对产生丝状物的最直接的影响因素为粒化工艺条件,而不是粒化器结构。

In order to improve the quality of centrifugal granulation products of blast furnace slag,the cold state experiment visualization research of blast furnace granulated centrifugal granulation was carried out for the problem of large size distribution of granulated blast furnace granules and easy generation of slag wool.The experimental results show that the serrated edge structure and the edge surface reinforced granulator can ensure the relative stability of the liquid film splitting mode during the granulation process.The granulated droplet size is small and uniform,compared with the ordinary flat plate.The sot average diameter can be reduced by a maximum of 0.7 mm.For a granulator with a diameter of 150 mm,the proportion of filaments can be effectively reduced when the melt temperature is greater than 130℃,the volume flow rate is in the range of 15~20 mL/s,and the rotation speed is in the range of 600 r/min to 800 r/min.The granulator structure has no obvious influence on it and the most direct and effective way to inhibit the filament production is to find the best granularity in the granulation process.