Environmental Friendly Recycling of EAF Steel Mill Dust - GSD's State-of-the-Art Waelz Process

Posted on 06 June 2014
 

Environmental Friendly Recycling of EAF Steel Mill Dust - GSD's State-of-the-Art Waelz Process
The Pyro-metallurgical Waelz process is the most often applied technology for the recycling of dusty steel mill residues globally, especially for EAF and Zn enriched BOF dust. The target of the recycling process is to make the metals, which are contained in the residues, available for re-use. The recycling of EAF dust closes the material loop between the steel and the zinc industry. More than 60 % of the produced zinc metal is used for corrosion protection on steel plates or structures. The steel at the end of its use is recycled as scrap in electric arc or induction furnaces for producing new steel. During this process the zinc coating is going to the dust. Nowadays still more than 50% of the generated dust is lost by sending it to landfill, which means an annual loss of more than 900,000 t of zinc. The paper explains the raw materials and their careful preparation, the reducing agents, the consumption figures and the different products. It focuses on the state-of-the-art techniques for environmental protection. The process can be operated free of wastewater, with extremely low diffuse dust emission and with very low atmospheric emission. The release of heavy metals or dioxin is well controlled by appropriate techniques. The Waelz process as it is applied by GSD is listed in the BREF-Notes of the European Community.2012 SEAISI Seminar

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