中国转底炉处理含锌尘泥生产中含碳球团粉化原因解析
An investigation into causes of degradation of carbon-containing pellet in production of zinc-containing dust sludge treated in rotary hearth furnace
郑锡瀚 1陈铁军 1万军营 1李圣辉 2罗之礼 3金路恒1
作者信息
- 1. 武汉科技大学资源与环境工程学院,湖北武汉 430081;冶金矿产资源高效利用与造块湖北省重点试验室,湖北武汉 430081
- 2. 宝武环科武汉金属资源有限责任公司,湖北武汉 430080
- 3. 武汉钢铁股份有限公司炼铁厂,湖北武汉 430080
- 折叠
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.
Abstract
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 ℃).
关键词
转底炉/含锌尘泥/粉化/资源循环利用/冶金尘泥Key words
rotary hearth furnace/zinc-containing dust sludge/degradation/resource recycling/metallurgical dust and sludge引用本文复制引用
基金项目
湖北省重点研发计划(2022BCA062)
出版年
2024
NETL
NSTL
万方数据