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煉鋼過程含鐵塵泥的基本物性與綜合利用

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

  • 摘要: 對國內8家具有行業代表性的長、短流程鋼鐵企業含鐵粉塵利用現狀進行調研,并采用X射線熒光光譜、化學分析、激光粒度分析、X射線衍射和掃描電子顯微分析等手段對含鐵粉塵性狀進行了分析.結果表明:煉鋼粉塵鐵、鈣、鋅元素含量較高,不僅可在鋼鐵生產中回收利用,還可開發為高附加值產品,用于化工、材料等行業;但產自不同工序的粉塵的粒度、比表面積、水分等物性差異較大;鐵主要以磁鐵礦、赤鐵礦、氧化亞鐵、少量金屬鐵及鐵酸鈣形式存在,Zn以鐵酸鋅存在.煉鋼粉塵的研發利用必須充分考慮上述諸多因素.目前煉鋼粉塵外售比例較大,部分用作燒結配料,少量用于煉鋼造渣劑,利用層次較低,需研究高效利用工藝技術.

     

    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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