100t转炉用含钛铁水冶炼高碳钢的留渣+单渣操作实践

针对100t转炉用含钛铁水冶炼高碳钢的前期成渣难于熔化、脱磷率低的问题,分析了含钛铁水转炉炼钢的成渣过程和炉渣的物理特性,开发了留渣+单渣工艺技术。循环利用终点炉渣,充分发挥渣中10%～13%FeO高（FeO）含量的特点,快速把含钛铁水冶炼前期的CaO-TiO₂-SiO₂三元渣系转变为CaO-TiO₂-SiO₂-FeO四元渣系,脱除钢中大部分磷。控制终渣碱度大于3.2、（TiO₂）含量小于5%,使转炉出钢C]≥0.20%、P]≤0.014%,转炉炼钢脱磷率达到88%～92%,石灰消耗下降到28 kg/t钢。

Operational Practice of Heel Slag + Single Slag for Steelmaking High Carbon Steel in 100 t BOF with Titanium-Bearing Hot Metal

Aiming at the problems such as difficult melting of slag and low dephosphorization rate at the early stage of steelmaking high carbon steel in 100 t BOF （ basic oxygen furnace） with titanium-bearing hot metal, the slagging process and the slag physical characters of BOF steelmaking with titanium-bearing hot metal are analyzed, the technology of heel slag + single slag is developed,:, e. The terminal slag is recycled to use,to full play the character of high FeO content of 10% ?13% FeO in the terminal slag, the CaO-TiO₂-SiO₂ ternaiy slag system in the early stage of steelmaking of titanium-bearing hot metal is rapidly converted into the Ca0-TiO₂ -SiO₂ -FeO quaternary slag system, so that most of phosphorus in steel is removed. The basicity of terminal slag is controlled to be more than 3. 2 , the TiO₂ content in terminal slag is controlled to be less than 5% ,the BOF tapping C]≥0.20% and tapping P]≤0.014%  , the dephosphorization rate of steelmaking in BOF reaches to 88% ?92% ,and the consumption of lime decreases to 28 kg per ton of steel.