Abandoned basic oxygen furnace gas (ABOFG) is a kind of byproduct fuel resource produced in the basic oxygen furnace (BOF) steelmaking process with a high temperature of 1773–1873 K and 20–40% (vol.%) CO and 20–30% (vol.%) CO₂ and is usually ignited and discharged as waste gas (34.7% abandoned rate). The effects and physicochemical phenomena of injecting CO₂-containing ABOFG into high-Cr-bearing vanadia−titania magnetite ironmaking are investigated. The thermodynamic calculation shows that the ABOFG injection changes the gas partial pressure and the oxygen potential in the slag−coke interfaces and suppresses the titanium carbonitride formation. According to the results of softening−melting−dripping experiments, the content of titanium carbonitride in the high-titanium slag decreases from 2.53% to 1.14% as the CO₂ content in ABOFG increases from 0 to 30%, which is conducive to improving the high-temperature physicochemical properties of molten slag. The recoveries of vanadium and chromium are also improved with the decrease in iron loss. Moreover, the residual coke still maintains a considerable compressive strength with a slight effect from ABOFG injection, which is expected to reduce carbon consumption.

中文翻译：

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多金属炼铁中CO2注入的理化现象

废弃碱性氧气炉气（ABOFG）是碱性氧气炉（BOF）炼钢过程中产生的一种副产品燃料资源，温度为 1773-1873 K 和 20-40% (vol.%) CO 和 20-30 % (vol.%) CO ₂并且通常被点燃并作为废气排放（34.7%的废弃率）。注入CO ₂的作用和理化现象研究了含 ABOFG 在高铬钒钛磁铁矿炼铁中的应用。热力学计算表明，ABOFG 注入改变了渣-焦界面中的气体分压和氧势，并抑制了碳氮化钛的形成。根据软化-熔化-滴落实验结果，高钛渣中碳氮化钛的含量从2.53%下降到1.14%，CO ₂ABOFG中的含量从0增加到30%，有利于提高熔渣的高温理化性能。钒和铬的回收率也随着铁损的降低而提高。此外，残留焦炭仍保持相当的抗压强度，ABOFG注入的影响很小，有望减少碳消耗。