弱氧化剂CO2(g)对含钒铁水吹炼制钒渣的影响

采用弱氧化剂选择性氧化含钒铁水，先弱氧化脱硅，再强氧化提钒，以获得高品位的钒渣。对弱氧化剂CO2浅度氧化含钒铁水炼制钒渣进行了理论分析，确定脱硅保钒反应的物理化学条件，研究了温度、CO2气体流量、搅拌和熔剂等因素对脱硅保钒反应的影响及脱硅反应产物的分布。结果表明，温度1450℃及CO2气体流量1 L/min、有搅拌条件下，脱硅率高达68.62%，而钒氧化率仅为0.73%。

Effect of weak oxidizer CO2(g) on the vanadium slag production from the vanadium-bearing molten iron

75%?85% of vanadium products in the world are produced from the vanadium?titanium magnetite, in vanadium-titanium magnetite, Fe, V and Ti are distributed in the isomorphism phase, which cannot be enriched and separated by physical methods. Usually, the vanadium slag and the semi-steel are obtained by the oxygen blowing process in the steel making process. The semi-steel is used to produce steel, and the vanadium slag is the raw material for extracting vanadium. When vanadium slag is obtained by blowing vanadium-bearing molten iron with oxygen, the impurities such as Ca, Mg, Al, Ti and Si in the molten iron enter into slag phase along with V, oxygen as a strong oxidizer. Both vanadium oxide and impurity oxides are contained in the vanadium slag, resulting in high impurity content and low vanadium grade, which make the subsequent vanadium extraction process costly, that is the drawback of the current vanadium slag process. Weak oxidizer CO2(g) was used in this research to produce the low-silicon and high-vanadium slag by selective oxidation, during which Si was removed into slag firstly and then V left in the molten iron by weak oxidation. Theoretical analysis was firstly performed and then the effects of temperature, flow rate of CO2(g), stirring and smelt agent on the desilication process were investigated. The results showed that the desilication rate reached 68.62%, and the oxidation rate of vanadium was only 0.73% when the desilication process was performed with stirring and CO2(g) flow rate of 1 L/min at 1450℃.