Ceramics-Silikáty 37, (2) 89 - 92 (1993) |
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THE UTILIZATION OF FERROCHROMIUM SLAG BY HYDROTHERMAL TREATMENT
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Števula Ladislav 1, Majling Ján 2, Frtalová Dana 1,
Dyda Marián 3
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1 Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 5, 842 96 Bratislava
2 Slovak Technical University, Faculty of Chemical Technology, Department of Ceramics, Glass and Cement, Radlinského 9, 812 97 Bratislava
3 Geological Institute, Slovak Academy of Sciences, Dúbravská cesta 5, 842 26 Bratislava
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In order to transform periclase to brucite, an aqueous suspension of ferrochromium slag containing γ-C₂S, MgO and soluble chromates was hydrothermally pretreated at 150 °C. Ghromates present in the solution were separated. Samples to be examined were prepared from the mixtures of the pretreated slag and powdered quartz (CaO/SiO₂ = 0.85 and 1.0 resp.). They were moulded and then hydrothermally treated at 180 °C. X-ray analysis, thermal and microscopic examination revealed the formation of binding products, mainly tobermorite and CSH(I) phase known for their considerable mechanical properties.
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