高富氧喷吹条件下钒钛炉料的软熔性能

Soft melt performance of vanadium titanium charge under high oxygen-enriched injection conditions

高炉炼铁工艺是钢铁冶金中能源消耗量最高的流程之一。在国家“降碳减碳”政策的号召下,保证高炉稳定顺行是节能减排的重要前提。高炉软熔带的位置、形状对炉内煤气流的分布状态及高炉的稳定顺行具有重要影响。本文通过模拟高富氧喷吹条件下高炉的还原性气氛,在不同还原性气氛条件下采用高温熔滴炉进行钒钛炉料的软化熔滴试验。结果表明:随着富氧率的提高,煤气中CO的体积分数增加,钒钛炉料的软化开始温度和软化结束温度均降低,软化温度区间变大;当CO体积分数从30%增加到45%时,软化开始温度下降72℃,软化结束温度下降43℃,软化温度区间扩大29℃。富氧喷吹后,熔化开始温度升高,炉渣流动性变好,滴落物质量增加;富氧喷吹后,钒钛炉料的软熔带整体呈现“上移扩大”的趋势,软熔带的最高压差逐渐降低,透气性得到改善,Ti元素向渣中迁移增强,Fe元素向渣中迁移得到抑制。

The blast furnace ironmaking process is one of the most energy-consuming processes in iron and steel metallurgy.Under the call of the national policy of “carbon reduction and carbon reduction”,ensuring the stable and smooth operation of blast furnace is an important prerequisite for energy conservation and emission reduction.The position and shape of the blast furnace soft melt zone have an important impact on the distribution state of the gas flow in the furnace and the stable anterograde of the blast furnace.The reducing atmosphere of the blast furnace under high oxygen-enriched injection conditions is simulated,and the softening droplet test of vanadium and titanium charge is carried out by using a high-temperature droplet melting furnace under different reducing atmosphere conditions.The results show that with the increase of oxygen enrichment,the volume fraction of CO in coal gas increases,the softening start temperature and softening end temperature of vanadium and titanium charge decrease,and the softening temperature range becomes larger.When the CO volume fraction is increased from 30% to 45%,the temperature at the beginning of softening is decreased by 72 ℃,the temperature at the end of softening is decreased by 43 ℃,and the softening temperature range is expanded by 29 ℃.After oxygen-enriched injection,the melting start temperature increases,the fluidity of the slag becomes better,and the quality of the dripping matter increases.After oxygen-enriched injection,the soft melt zone of vanadium and titanium charge shows a trend of “moving up and expanding”,the maximum pressure difference of the soft melt belt gradually decreases,the air permeability is improved,the migration of Ti elements to the slag is enhanced,and the migration of Fe elements to the slag is inhibited.