减少45t AOD奥氏体不锈钢精炼过程喷溅的工艺优化

Process Optimization for Decreasing Spitting in 45 t AOD Refining Process of Austenite Stainless Steel

太钢45tAOD在2004年改造后,由于AOD炉容比减小,造成新炉壳前期钢水喷溅严重,导致大量的金属和合金的损失。通过脱碳初期,在保证基本碱度的前提下,将石灰加入量由原20%降至10%,加石灰次数由原5次增至8次,脱碳后期原氮(氩)和氧气流量由原2040 m^3/h和1020 m^3/h降低至1800m^3/h和1000m^3/h等工艺措施,使AOD精炼过程的喷溅显著降低,硅铁消耗量降低0.6 kg/t,金属收得率由96.7%提高到98.4%,精炼时间缩短3 min。

After revamping 45 t AOD unit at TiSCO in 2004,due to decreasing of AOD furnace volume ratio with new furnace shell the steel spitting is serious in earlier refining period led to larger loss of metal and alloy. With the measures including in earlier decarburization period at prerequisite to insure basic basicity of slag, the amount of lime decreases from original 20% to 10% and the adding times of lime increases from original 5 times to 8 times, and in decarburization later period the nitrogen（argon） and oxygen flow rate decrease respectively from original 2 040 m^3/h and 1 020 m^3/h to 1 800 m^3/h and 1 000 m^3/h, the spitting in AOD refining process decreases obviously, the consumption of ferrosilicon decreases by 0. 6 kg/t, the yield of metal increases from 96. 7% to 98. 4% and the refining time reduces by 3 min.