Modification of molten steelmaking slad for cement application

Reference:

The use of metallurgical slags in cement production depends on the phases present in such slags, which are affected by changes in slag composition as well as the cooling rates adopted during solidification. In this work, slags with distinct chemical compositions were melted and subjected to different cooling conditions. Slag samples were characterized by X-ray diffraction to identify and quantify mineralogical phases and by X-ray fluorescence to determine chemical composition. The microstructure of the samples was characterized by scanning electron microscopy coupled to energy dispersive spectroscopy for phase identification. The solidification of the slags was simulated using FactSage™ for solidification path evaluation, enabling a comparison of the phases determined by thermodynamic equilibrium with those analysed in slag samples. Slags with low basicity (CaO/SiO2 <1.25) and Al2O3 content of 11 wt% exhibited a high glassy phase content depending on the cooling conditions. The phases formed in slags with higher basicity (1.4 and 3.8) were less affected by cooling rate and were different silicates, such as larnite, merwinite, monticellite, akermanite, gehlenite and melilite, whereas slags with basicity ≥1.37 exhibited RO phase (solid solution of FeO, MgO, CaO and MnO).

Reference:
FERREIRA NETO, João Batista; FARIA, Joao Oswaldo Macedo e; FREDERICCI, Cátia; CHOTOLI, Fabiano Ferreira; SILVA, Andre Luiz Nunis; FERRARO, Bruno B.; RIBEIRO, Tiago Ramos; MALYNOWSKYJ, Antonio; QUARCIONI, Valdecir Angelo; LOTTO, André Alexandrino. Modification of molten steelmaking slad for cement application. In: INTERNATIONAL SLAG VALORISATION SYMPOSIUM ZERO WASTE, 4., 2015, Leuven, Belgiu. Proceedings… 7 p.

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FERREIRA NETO, João Batista; FARIA, João Oswaldo Macedo Garcia de; FREDERICCI, Cátia ; CHOTOLI, Fabiano Ferreira; SILVA, André Luiz Nunis da; FERRARO, Bruno B.; RIBEIRO, Tiago Ramos; MALYNOWSKVJ, Antonio; QUARCIONI, Valdecir Angelo; LOTTO, André Alexandrino . Modification of molten steelmaking slad for cement application. Journal of Sustainable Metallurgy, v.2, p.13-27,oct., 2015. Doi 10.1007/s40831-015-0031-7 

Access to the article on the Journal website:
https://link.springer.com/article/10.1007/s40831-015-0031-7



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