宝钢不锈钢事业部2500m^3高炉的高Al_2O_3炉渣生产实践

Operation of high Al_2O_3 slag from the 2500 m^3 blast furnace in Baosteel Stainless Steel Unit

在近年来铁矿石价格持续上扬、铁矿石资源不断劣化的大背景下,宝钢不锈钢事业部炼铁厂高炉入炉A l2O3负荷在2009年1～4月达到47.4 kg/t,为了将炉渣A l2O3含量控制在15%,高炉渣比被迫增大到310 kg/t以上。预计多使用劣质铁矿石资源必将成为高炉冶炼的趋势,故突破炉渣A l2O3含量15%水平的上限势在必行。为此,开展了适当放宽高炉炉渣A l2O3含量的研究及其生产实践。分别选取2009年1～4月(炉渣A l2O3月平均含量为14.86%)、2010年1～4月(炉渣A l2O3月平均含量为16.81%)两段时期,对比分析高炉的生产技术指标。结果表明,通过高炉操作制度的合理调控,高炉有能力接受16%水平的炉渣A l2O3含量。

In recent years,iron ore has been rising in price and degrading in quality.Under this background,Al2O3 load of the 2 500 m3 blast furnace in Baosteel Stainless Steel Unit reached 47.4 kg/t in the period of January to April 2009.In order to restrict Al2O3 content in slag to the level of 15%,slag rate was forced to hoist to more than 310 kg/t.It has been predicted that using low-quality iron ore resources will be the main trend for the blast furnace process in the future,so it will be imperative to break through the ceiling of 15% Al2O3 content in slag.Therefore,the study and production practice in terms of appropriately increasing Al2O3 content in slag have been carried out.In this paper,the technical indicators in the two periods： from January to April 2009（the monthly average slag Al2O3 content was 14.86%） and from January to April 2010（the monthly average slag Al2O3 content was 16.81%） were compared.The analytical results show that the 2 500 m3 blast furnace in Baosteel Stainless Steel Unit has the ability to accept 16% slag Al2O3 content by reasonable control of the operational system.