B2O3对含钛高炉渣中钙钛矿相及渣铁分离的影响

Effect of B2O3 on separation of perovskite and slag in Ti-bearing blast furnace slag

针对钒钛磁铁矿高炉冶炼过程出现的炉渣黏稠、渣铁难分等问题,通过配加不同比例的B_2O_3改性剂对炉渣成分进行调整,研究了改性剂对含钛高炉渣中钙钛矿晶粒的析出行为、微观形貌等的影响,并探讨了改性剂B_2O_3的改性机理。结果表明,添加一定量的B_2O_3能够对钙钛矿晶粒的析出产生比较明显的抑制作用,其效果随B_2O_3添加量的增加而增加。结合SEM-EDS对产物进行分析,发现随着B_2O_3改性剂用量的增加,金属铁更加容易聚集长大。B_2O_3作为一种低熔点助熔剂进入高钛型高炉渣中,能够有效地降低冶金渣的黏度和液相线温度,改变渣的物相组成,实现富钛相较好的富集,此方面的机理研究能够对将来高钛型高炉渣的资源化利用提供一定的理论基础。

In order to study the slag composition of vanadium-titanium magnetite in the blast furnace smelting process and slag-iron slag,the slag composition was adjusted by adding different proportions of B_2O_3 modifiers. The effects of modifier on the microstructure and the precipitation behavior of the titanium ore grains were investigated,and the modification mechanism of the additive B_2O_3 was discussed preliminarily. The results show that the addition of a certain amount of B_2O_3 can inhibit the precipitation of perovskite grains obviously,and the effect increases with the B_2O_3 content increasing. The product is analyzed by SEM-EDS,and it is found that the metal iron grows more easily with the increase of the amount of B_2O_3 modifier. As a low melting flux into the high titanium blast furnace slag,B_2O_3 can effectively reduce the viscosity of metallurgical slag and liquidus temperature,and change the phase composition of slag to achieve a better enrichment of titanium-rich. Thus,the mechanism inveatigation can provide a theoretical basis for the future utilization of high titanium blast furnace slag.