近似核壳型微球对钢渣的熔融还原行为分析

以钢渣的纤维化应用为最终目标,将高分子材料科学中的核壳结构应用技术引入到钢铁冶金领域,用于高效还原重构熔融钢渣,并采用超高温激光共聚焦显微镜,对核壳微球在液渣中的熔融还原行为进行微观研究,分析温度和钢渣酸度系数对微球还原基层熔速的影响。研究结果表明,将核壳微球设计成悬浮于熔渣中间部位,其熔融还原反应要早于常规粉剂还原6 min到达平衡状态,渣中金属氧化物的还原回收时效性得到明显提高。不同还原基层核壳微球对比显示,铝基微球表现出极好的还原时效性,反应3 min内还原率达到了95.17%。高温、高酸度系数熔渣能够促进核壳微球还原基层的快速熔融,有效改善还原反应的热力学条件,提升还原渣中金属氧化物的时效性,达到渣金迅速分离的效果。通过微球还原基层-渣界面的熔融动力学模型,计算出微球还原基层介质在不同条件下的有效二元扩散系数范围为3.86×10^-11～4.92×10^-11 m²/s。对于工业应用还原基材重构改性钢渣而言,可以碳为主要还原基材配加适量的铝或硅来制备成核壳微球用于钢渣的还原重构,可显著提升钢渣还原重构的时效性,并取得...

Melting and reduction behavior of core-shell microsphere in steel slag

The ultimate goal of this study is the application of steel slag fibrosis. The application technology of core-shell structure in polymer materials science is introduced into the field of iron and steel metallurgy for efficient reduction and refactoring of molten steel slag. The melting and reduction behavior of core-shell microsphere in slag was studied by using ultra-high temperature laser confocal microscope. The effects of temperature and acidity coefficient on the melting rate of microsphere reduction base were analyzed. The results show that when the core-shell microsphere is suspended in the middle part of the slag,the melting reduction reaction reaches the equilibrium state 6 min earlier than that of the conventional powder reduction. The reduction and recovery timeliness of metal oxides in slag is obviously improved. The comparison of core-shell microsphere with different reduction substrates show that the aluminum-based microsphere exhibits an excellent reduction timeliness,and the reduction rate reaches 95.17% within 3 min. The slag with high temperature and high acidity coefficient can promote the rapid melting of core-shell microsphere and effectively improve the thermodynamic conditions of reduction reaction. It can improve the timeliness of metal oxides in reduction slag,and achieve the effect of rapid separation of slag and metal. Based on the melting kinetics model of the substrate and slag interface of microsphere,the effective binary diffusion coefficients of microsphere reduction substrate range from 3.86×10-11 to 4.92×10-11 m2/s under different conditions. For the industrial application of steel slag refactoring and modification by reducing substrate,carbon can be used as the main reducing substrate and an appropriate amount of aluminum or silicon can be added to prepare the core-shell microsphere for the reduction and refactoring of steel slag,which can significantly improve the timeliness of the reduction and refactoring of steel slag and achieve high economic benefits. It provides a new idea for the efficient reduction of steel slag.