冷却速率对钢渣物相结构和稳定性的影响研究

Effect of cooling rate on the phase structure and stability of steel slag

为了解钢渣处理的冷却机制,实现钢渣清洁化利用,对熔融钢渣进行高温冷却试验,通过炉冷、空冷、水雾冷却、水淬4种不同冷却处理方法,研究了冷却速率对钢渣物相结构、物相转变规律、微观形貌和稳定性的影响。热力学平衡计算结果表明钢渣在冷却过程中部分钙先后以硅酸盐和铁酸钙的形式结晶,部分以金属氧化物固溶体的形式存在;钢渣碱度越高,游离氧化钙含量越高。高温熔渣冷却试验结果表明随着冷却速率增加,钢渣中硅酸盐和固溶体氧化物含量升高,而游离氧化钙含量显著降低,钢渣的稳定性可显著提高。

In order to understand the cooling mechanism of steel slag treatment and realize the clean utilization of steel slag,the high temperature cooling test of molten steel slag was carried out.And the effect of cooling rate on the physical phase structure,phase transformation law,microstructure and stability of steel slag were studied by four different cooling treatment methods,viz.,furnace cooling,air cooling,water mist cooling,and water quenching.The results of thermodynamic equilibrium calculations show that some of calcium crystallizes in the form of calcium silicate and calcium ferrite,and some exist in the form of metal oxide solid solution.The higher the basicity of the steel slag,the higher the content of free calcium oxide.The results of high temperature slag cooling experiments show that as the cooling rate increases,the content of silicate and solid solution oxides in the slag increases,while the content of free calcium oxide decreases significantly,the stability of the slag can be significantly improved.