高钛铁水转炉少渣冶炼技术研究实践

Study and practice of BOF less-slag steelmaking technology with high-titanium hot metal

渣料消耗是转炉炼钢的关键经济技术指标之一,其值高低代表炼钢技术水平,与满足脱磷、护炉要求相矛盾。某钢厂受高炉矿原料配比影响,铁水钛、磷含量较高,为保脱磷、护炉满足要求,渣料消耗较高。为此,基于高钛铁水性质及其转炉成渣特征,优化转炉供氧制度、造渣制度,以“镁固钛”为技术核心,控制炉渣高TiO_(2)含量对脱磷、护炉的影响,提高渣料利用率。通过上述工艺的持续优化,形成了高钛铁水转炉少渣冶炼技术,渣料消耗由55.67 kg/t降低至45.86 kg/t,取得了较好的经济效益,为高效化炼钢技术发展奠定了基础。

The consumption quantity of slagging materials is one of key economic and technical indicators of BOF steelmaking and represents the technical level of steelmaking,but it is inconsistent with the requirements of dephosphorization and furnace-lining protection.In an iron and steel enterprise,the contents of titanium and phosphorus in hot metal are high due to titanium-bearing iron ore used for ironmaking in blast furnace,so the consumption quantity of slagging materials is high in order to meet requirements of dephosphorization and furnace-lining protection.Therefore,based on the characters of high-titanium hot metal and the characteristics of slagging in BOF,the rules about oxygen supply and slagging were improved,a method called as“magnesium fixing titanium”(TiO 2 becomes inactive due to its combining with MgO)was taken as a technique to suppress the disadvantage influence of high-TiO_(2) slag on dephosphorization and furnace-lining protection to enhance the advantage efficiency of slag.By the continuous improvement of the above processes,a BOF less-slag steelmaking technology with high-titanium hot metal was developed.The consumption quantity of slagging materials was reduced from 55.67 kg/t to 47.86 kg/t.Good economic benefit was achieved,and a foundation for the development of high efficient steelmaking technology was laid.