炼钢过程含铁尘泥的基本物性与综合利用

Basic properties and comprehensive utilization of iron-containing sludge & dust in the steelmaking process

  • 摘要: 对国内8家具有行业代表性的长、短流程钢铁企业含铁粉尘利用现状进行调研,并采用X射线荧光光谱、化学分析、激光粒度分析、X射线衍射和扫描电子显微分析等手段对含铁粉尘性状进行了分析.结果表明:炼钢粉尘铁、钙、锌元素含量较高,不仅可在钢铁生产中回收利用,还可开发为高附加值产品,用于化工、材料等行业;但产自不同工序的粉尘的粒度、比表面积、水分等物性差异较大;铁主要以磁铁矿、赤铁矿、氧化亚铁、少量金属铁及铁酸钙形式存在,Zn以铁酸锌存在.炼钢粉尘的研发利用必须充分考虑上述诸多因素.目前炼钢粉尘外售比例较大,部分用作烧结配料,少量用于炼钢造渣剂,利用层次较低,需研究高效利用工艺技术.

     

    Abstract: The utilization status of iron-containing sludges & dusts in eight domestic steel plants including typical EAF short route and BOF long route metallurgical processes was investigated,and the basic properties of iron-containing sludges & dusts were studied using X-ray fluorescence spectrometry,chemical analysis,size distribution analysis,X-ray diffraction,scanning electron microscopy and other analytical methods. The results show that the steelmaking sludges & dusts have high contents of Fe,Ca,and Zn. They can not only be recycled inside the steel plants,but also can be used to develop high value-added products,which relate to the chemical and materials industry. There are more differences in particle size,specific surface,and moisture for the sludges & dusts from different processes. And the iron is present as magnetite,ferrous oxide,hematite,calcium ferrite,and metallic iron,and zinc exists in zinc ferrite. Such above factors must be taken into consideration when the steelmaking dust is studied and utilized. At present,the proportion of steelmaking dust for sale is large and some is used as the sintering raw material,and a small portion of steelmaking dust is used for the slag forming agent. Considering the low utilization levels,relevant technology should be studied to utilize iron-containing sludge & dust efficiently.

     

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