The effects of CO₂ injection on the high-temperature metallurgical performance of Cr-bearing vanadia-titania magnetite (CVTM) in blast furnace (BF) smelting were investigated. The dry air or O₂-enriched air is not necessarily suitable for any blast furnace production, and CO₂-containing high-temperature energy-carried gas (CHEG) also can be an alternative injection gas with lower cost and pollution. This kind of CHEG can be blast furnace gas, basic oxygen furnace gas, coke oven gas, sintering gas and rotary kiln gas and so on, which contained high sensible heat and CO₂, H₂ and CO. Injecting CHEG into the blast furnace can replace air injection to achieve the heat balance in the cohesive zone and raceway. The calculated boundary injection ratio of CO₂ is approximately 15.3%, and the experimental optimal CO₂ injection ratio is about 10∼20%. CO₂ injection benefits the blast furnace operation, the permeability of cohesive zone, recovery ratio of Cr and V. With increasing injected content of CO₂, the temperature range of softening zone [T₄₀-T₄] and melting-dripping zone [T_d-T_s] decrease almost 20℃, and the dripping ratio increases from 62.36% to 69.76%, the recovery of V increases from 32.75% to 47.96%, and the recovery of Cr increases from 42.35% to 64.41%. The CO₂ injection affects the melting temperature of the high-titanium slags to be higher and the maximum temperature difference can reach 45℃, which is beneficial to the slag stability and separation of slag-iron and restrain the over-deduction of titania to TiN upon the slag-coke interface with lower N₂.

研究了CO ₂注入对高炉冶炼含铬钒钛磁铁矿（CVTM）高温冶金性能的影响。干燥的空气或富含O _2的空气不一定适合任何高炉生产，并且含CO ₂的高温载能气体（CHEG）也可以作为替代喷射气体，具有较低的成本和污染。这种CHEG可以是高显热，CO ₂，H ₂含量高的高炉煤气，碱性氧气炉煤气，焦炉煤气，烧结气和回转窑煤气等。在高炉中注入CHEG可以代替空气注入，以实现内聚区和滚道的热平衡。计算出的CO ₂边界注入率约为15.3％，实验最优CO ₂注入率约为10〜20％。注入CO _2有利于高炉操作，粘结区的渗透性，Cr和V的回收率。随着注入CO ₂含量的增加，软化区的温度范围[T ₄₀ -T ₄ ]和熔滴区[T] _d -T_小号]下降约20℃，滴水率从62.36％增加到69.76％，V的回收率从32.75％增加到47.96％，Cr的回收率从42.35％增加到64.41％。注入CO ₂会影响高钛渣的熔融温度更高，最高温差可达45℃，有利于渣的稳定和渣铁的分离，抑制二氧化钛过度还原成TiN N ₂较低的炉渣-焦炭界面上。