Abstract：Steel slag represents an excellent opportunity for their use as alternative cement materials. Specifically black slag produced during the melting process in EAF (Electric Arc Furnace) can be used as adjunct in the operation of landfilling, in the building operation of road grounds and in the production of concrete. Their use limitation is due to the presence of polluting chemical elements, including Cr, Ba, V, Mo, etc, that can be dangerous for humans and the environment, resulting from the use of polluted scraps. Several experimental trials have been performed on the slag provided by two Italian steelmaking plants producing reinforcing bars. The chemical compositions of the final obtained slag belong to a range in which the slag has shown a releasing behaviour that is significantly different as a function of the different ratios among the fundamental constituting chemical species, i.e. CaO, SiO2, Al2O3, MgO etc.. The chemical composition has been characterized through the optical basicity and the slag has been investigated from a microstructural point of view through scanning electron microscopy techniques that permitted to identify the main phases contained in the slag and to characterize their chemical composition and the dangerous polluting elements solved in each phase. The combination of the data coming from chemical analysis, microstructural examination and the releasing tests allowed to identify a specific chemical composition range preventing dangerous chemical releasing. Such break though has provided the possibility to identify a correct procedure for treating and modifying the slag.
通讯作者:
Mombelli D
E-mail: davide.mombelli@mail.polimi.it
作者简介: Mapelli C (1973－), 男, 教授, 冶金工艺 ； Mombelli D (1984－), 男, 博士生, 冶金工艺
引用本文:
Mapelli C，Mombelli D*，Gruttadauria A，Baldizzone C，Magni F， Levrangi P L ，Simon P. 电弧炉炉渣的显微结构和化学特性[J]. 冶金分析, 2012, 32(3): 7-13.
Mapelli C，Mombelli D*，Gruttadauria A，Baldizzone C，Magni F， Levrangi P L ，Simone P. Micro structural and chemical characterization of electric arc furnace slag. , 2012, 32(3): 7-13.
