Recycling of Waste Oxides in Steelmaking - Final Report

Fruehan, R. J.

American Iron and Steel Institute, Pittsburgh, PA (United States)

关键词: Dusts;    Slags;    Wastes Waste Oxides;    Waste Oxide Briquettes;    Productivity;   

DOI  :  10.2172/789632
RP-ID  :  DOE/ID/13554
RP-ID  :  FC07-97ID13554
RP-ID  :  789632

美国|英语

来源: UNT Digital Library

【 摘 要 】

This research primarily examined the use of waste oxide briquettes (WOB), prepared from blast furnace and basic oxygen furnace (BOF) dusts and mill scale, in BOFs and in particular, the reasons for the methods to reduce slopping in BOF when WOBs are used. Also, the recycling of EAF and stainless steelmaking dusts were examined. It is found that at a critical FeO content in the slag, metal drops emulsify increasing the reaction area and rate drastically, promoting slopping. Recommendations were made to delay the build-up of FeO in the slag to this critical value, thus reducing slopping. Although recycling of EAF dusts in the EAF increased energy use and decreased productivity, it provides Fe units, reduces dust disposal by 25-40%, and increases the Zn content of the dust to acceptable levels for the use by Zn-producers. Stainless steelmaking dusts can also be recycled as WOBs adding Cr to the melt and generating CO gas resulting in good slag foaming.