铝灰用于钢包渣改质剂试验

Development of Ladle Slag Reducer Using Aluminum Dross

低铝铝灰中单质Al质量分数小于5%,循环再利用性较差。对其用于钢包渣改质剂的可行性做了试验,发现铝灰中除单质Al外,AlN也是一种还原剂。试验采用渣钢比1∶10放入MgO坩埚中加热到1 600℃,将铝灰和石灰与萤石按4∶6∶1混合后加入坩埚中,保温90min后自然冷却。试验结果表明低铝铝灰具有很好的还原性,可将钢包渣中w((FetO))由31.17%降低至3.24%,钢中w([O])由480×10-6降低至17×10-6,钢中w([S])由190×10-6降低至75×10-6,但该过程会造成钢液增[N],w([N])由66×10-6增至129×10-6。

In the current study,ladle slag reducer was made using aluminum dross that contained a low content of me- tallic aluminum and high percentage of AlN. Laboratory experiments were performed in MgO crucibles under 1 600 ℃ with a 1 ： 10 dross-steel ratio and a 4：6 ： 1 dross-lime-fluorite, the samples were cooled by nature convection after 90 min heat preservation. The results indicate that both AlN and metallic aluminum in the dross could work as reducer to remove the oxygen in BOF slags carried on. Using this kind of aluminum dross, the w（ （Fet O）） in BOF slag could be decreased from 31.2% to 3.2 %, w（[O]） in the steel can be lowered from 480 ×10^-6 and 17 × 10^-6 , and w（[S]） in the steel is lowered 190×10^-6 and 7×10^-6. However,the w（[N]） in the steel is increased from 66×10-6 to 129×10^-6.