摘要
转底炉(RHF)工艺是中国处置钢铁行业含锌粉尘的有效方式之一。目前,转底炉处理含锌尘泥生产中存在含碳球团粉化严重的问题,会对生产顺行与产品质量造成不利影响。因此,对原料预处理系统、压球成型系统、干燥系统、转底炉直接还原系统、金属化球团冷却系统等各个工序中含碳球团的粉化现象进行全面考察与解析。解析发现含碳球团粉化包括自然粉化与还原粉化,自然粉化的主要原因是炼钢尘泥中活性氧化钙(f-CaO)的消解不完全与含碳球团在干燥过程中水分表面气化和内部扩散速度的差异;还原粉化的主要原因在于低温(400~600℃)还原过程中含铁物相晶型转变与晶体体积变化。
The rotary hearth furnace(RHF)process is one of the effective ways to dispose of zinc-containing dust in the iron and steel industry in China.Currently,there is serious degradation of carbon-containing pellets in the process of treating zinc-containing dust and sludge by the RHF process,which adversely affects the smooth operation of the production line and product quality.Therefore,the degradation phenomenon of carbon-containing pellets in each process of RHF was systematically analyzed,such as raw material pretreatment system,balling system,drying system,direct reduction system of RHF,and pellets cooling system.The analysis results show that the degradation of carbon-containing pellets mainly includes natural degradation and reduced degradation.The main reason for natural degradation is the incomplete digestion of active calcium oxide(f-CaO)in the steelmaking dust sludge and the difference in surface vaporization and internal diffusion speed of moisture in carbon-containing pellet during the drying process.The main reason for reduction degradation is the crystalline transformation and crystal volume change of the iron-containing phase during the reduction process at low temperature(400-600℃).
作者
郑锡瀚
陈铁军
万军营
李圣辉
罗之礼
金路恒
ZHENG Xihan;CHEN Tiejun;WAN Junying;LI Shenghui;LIUO Zhili;JIN Luheng(School of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;Hubei Key Laboratory of Efficient Utilization and Agglomeration of Metallurgical Mineral Resources,Wuhan 43008l,Hubei,China;BAOWU Environmental Technology Wuhan Metal Resources Co.,Ltd.,Wuhan 430080,Hubei,China;Ironmaking Plant of Wuhan Iron and Steel Co.,Ltd.,Wuhan 430080,Hubei,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2024年第5期560-567,共8页
Journal of Iron and Steel Research
基金
湖北省重点研发计划资助项目(2022BCA062)。
关键词
转底炉
含锌尘泥
粉化
资源循环利用
冶金尘泥
rotary hearth furnace
zinc-containing dust sludge
degradation
resource recycling
metallurgical dust and sludge
