How to improve slag valorisation by hot stage processing:an example of industrial ecology in steelmaking
In accordance with the principles of industrial ecology,the overall energy and material efficiency of the steelmaking industry needs to be drastically improved.One area within steelmaking that requires specific attention is slag valorisation.Large volumes of steelmaking slags are produced each year,leading to important economical and ecological issues regarding their afterlife.In the past,slags were predominantly considered as waste;nowadays slags are increasingly being valorised in various applications,thereby saving on natural resources and CO2 emissions.To maximise the recycling potential,sound slag processing needs to become an integral part of the valorisation chain.However,processing is often directed solely towards the cooled slag.In this article,the authors review the literature dedicated to the hot stage of slag processing,i.e.from the moment of slag/metal separation to complete cooling at the slag yard.Using the case-study of slag disintegration it is shown that the functional properties of the cooled slag can be enhanced by additions to the high temperature slag and/or variations in the cooling path.The technology to implement such hot stage processing steps is currently available.No breakthrough technologies are required.Rather,advances in hot stage slag processing seem to rely primarily on further unravelling the relationships between process,structure and properties.This knowledge is required to identify the critical process parameters for quality control.Moreover,this could allow to consciously modify slag compositions and cooling paths to tailor slags to specific applications.
slag valorisation industrial ecology microstructure disintegration leaching
Dirk Durinck Peter Tom Jones Muxing Guo Sander Arnout Jeroen Heulens Bart Blanpain Patrick Wollants
Department of Metallurgy and Materials Engineering,Katholieke Universiteit Leuven,Kasteelpark Arenberg 44 bus 2450,B-3001 Leuven,Belgium
国际会议
上海
英文
1217-1223
2008-09-26（万方平台首次上网日期，不代表论文的发表时间）