高炉渣作为气淬喷吹原料的可行性分析

Feasibility analysis of blast furnace slag as gas quenching raw material

干式粒化法能够克服传统高炉渣处理方法水淬法带来的一系列问题,气淬喷吹法作为一种有前途的干式处理方法在显著回收高炉渣显热的同时能够提高炉渣利用附加值。为了研究高炉渣作为气淬喷吹原料的可行性,通过对高炉渣进行不同碱度的调质,研究高炉渣的流动性、表面张力和结晶行为,并分析熔渣物理特性对粒化效果的影响。结果表明,高温下碱性渣的黏度要小于酸性渣,而且当碱度大于1.0后,高温区黏度值基本保持在1 Pa·s以下不易成纤区间,这更有利于熔渣破碎成珠,但超过1.3后,黏度有增加趋势,同时熔化性温度急剧增加,所以碱度不易过大;高炉渣表面张力随碱度的增加逐渐增加,有利于提高渣珠规则度;玻璃体随碱度的增加逐渐减少,不利于提升渣珠的物相品质。

The dry granulation method can overcome a series of problems caused by the water quenching method of blast furnace slag traditional treatment method. As a promising dry treatment method, gas quenching injection method can significantly recover sensible heat of blast furnace slag and increase the added value of slag utilization. In order to study the feasibility of blast furnace slag as gas quenching raw material, the flowability, surface tension and crystallization behavior of BFS are studied by adjusting and tempering BFS with different basicities. The influence of physical properties of BFS on granulation effect is analyzed. The results show that the viscosity of alkaline slag at high temperature is less than that of acid slag. When the basicity is more than 1.0, the viscosity of the high temperature zone is basically kept below 1 Pa·s, which is not easy to form fiber and is more beneficial to break into beads. However, the viscosity tends to increase after more than 1.3, and the melting temperature increases sharply, so the basicity is not easy to be too large. With the increase of basicity, the surface tension increases gradually, which is helpful to improve the regular degree of slag beads. With the increase of basicity, the glass decreases gradually, which is not conducive to improving the phase quality of slag beads.