Study on process optimization of the vanadium containing hot metal pretreatment

A larger resulfurization took place in converter steelmaking using semi-steel from vanadium-containing molten iron pretreatment as hot metal in the Xichang Steel and Vanadium plant, which results in a serious impact on the improvement and qualified rate of a variety of high quality clean steels production. On the problems were present at the process of vanadium containing hot melt pretreatment, some production process optimization tests and process comparative analysis were carried out. The results showed that: resulfurization results in a difficult control of sulfur content in molten steel in course of vanadium recovery via BOF operation for the first desulfurization next vanadium recovery that is suitable for the production of normal sulfur steels. The first vanadium recovery next desulfurization is in more favor of slag skimming and low iron loss, which is suitable for the production of low sulfur steels. The production costs of the latter reduce 15 to 22 yuan / ton steel than the former, on the basis of cost comparison of plain steels and low sulfur steels, respectively.