CO2-O2混合喷吹对铁液中C、V元素氧化的影响

为了验证用CO2替代部分O2进行转炉氧化提钒的可行性,在实验室进行了CO2-O2混合喷吹提钒模拟实验。结果显示C的氧化量与C的氧化速率随CO2含量的增加而升高;V的氧化量随CO2含量的增加而降低,其中CO2含量为20%与纯O2对C、V的氧化量接近;纯O2喷吹时C的氧化量为34.56%,V的氧化量为96.85%;CO2含量为20%混合气体喷吹时C的氧化量为36.83%,V的氧化量为93.29%;以V的相对氧化量与C的相对氧化量的比值(ΔV/ΔC)来衡量提钒保碳能力,CO2含量为20%的最终ΔV/ΔC为5.96,CO2含量,40%、60%、80%的最终ΔV/ΔC均小于3.8;反应前期,V的氧化速率随CO2含量的增加而升高,反应后期V的氧化速率随CO2含量的增加而降低。

Effect of CO2 and O2 mixed injection on the oxidation of carbon and vanadium in vanadium-containing hot metal

To clarify the possibility of substituting part of O2 with CO2 during the vanadium extraction process in converter,the oxidation of vanadiumTo clarify the possibility of substituting part of O2 with CO2 during the vanadium extraction process in converter,the oxidation of vanadium-containing hot metal is carried out on a laboratory-experimental scale by using CO2-O2 gas mixture as oxidizer.The results show that both the oxidized carbon and oxidation rate of carbon in the hot metal are increased with increasing proportion of CO2 in the gas mixture,while the amount of oxidized vanadium decreases with increasing proportion of CO2 .The amounts of oxidized vanadium and carbon are comparable when the CO2 proportion is 0 and 20% (volume percentage)respectively.The amount of oxidized carbon and vanadium is 34.56%and 96.85% respectively when the CO2 proportion is 0,and the amount of oxidized carbon and vanadium is 36.83% and 93.29%respectively when the CO2 proportion is 20%.The ratio of vanadium oxidation amount to carbon oxidation amount (ΔV/ΔC)is adopted to evaluate the effectiveness of extracting vanadium.TheΔV/ΔC is 5.96 when the CO2 proportion is 20%,and the ΔV/ΔC are all below 3.8 when the CO2 proportion is 40%,60% and 80%.The vanadium oxidation rate increases in the early reaction stage and decreases in the late reaction stage with increasing of CO2 concentration.