Crystallization characteristics of iron-rich glass ceramics prepared from nickel slag and blast furnace slag

Abstract

The crystallization process of iron-rich glass-ceramics prepared from the mixture of nickel slag (NS) and blast furnace slag (BFS) with a small amount of quartz sand was investigated. A modified melting method which was more energy-saving than the traditional methods was used to control the crystallization process. The results show that the iron-rich system has much lower melting temperature, glass transition temperature (T _g), and glass crystallization temperature (T _c), which can result in a further energy-saving process. The results also show that the system has a quick but controllable crystallization process with its peak crystallization temperature at 918°C. The crystallization of augite crystals begins from the edge of the sample and invades into the whole sample. The crystallization process can be completed in a few minutes. A distinct boundary between the crystallized part and the non-crystallized part exists during the process. In the non-crystallized part showing a black colour, some sphere-shaped augite crystals already exist in the glass matrix before samples are heated to T _c. In the crystallized part showing a khaki colour, a compact structure is formed by augite crystals.

Keywords

glass ceramics / grain growth / crystallization / slag

References

[1] Alizadeh P., Yekta B. E., Gervei A. Effect of Fe₂O₃ addition on the sinterability and machinability of glass-ceramics in the system MgO-CaO-SiO₂-P₂O₅. J. Eur. Ceram. Soc., 2004, 24(13): 3529.

[2] Eniu D., Cacaina D., Coldea M., et al. Structural and magnetic properties of CaO-P₂O₅-SiO₂-Fe₂O₃ glass-ceramics for hyperthermia. J. Magn. Magn. Mater., 2005, 293(1): 310.

[3] Francis A.A. Magnetic of characteristics of iron-containing glass originated from the mixture of various wastes. Ceram. Int., 2007, 33(2): 163.

[4] Kehagias Th., Komninous Ph., Kavouras P., et al. Crystal phase separation and microstructure of a thermally treated vitrified solid waste. J. Eur. Ceram. Soc., 2006, 26(7): 1141.

[5] Fredericci C., Zanotto E.D., Ziemath E.C. Crystallization mechanism and properties of a blast furnace slag glass. J. Non Cryst. Solids, 2000, 273(1–3): 64.

[6] Wang S.M., Liang K.M. High infrared radiance glass-ceramics obtained from fly ash and titanium slag. Chemosphere, 2007, 69(11): 1798.

[7] Francis A.A., Rawlings R.D., Sweeney R., et al. Crystallization kinetic of glass particles prepared from a mixture of coal ash and soda-lime cullet glass. J. Non Cryst. Solids, 2004, 333(2): 187.

[8] Colombo P., Brusatin G., Bernardo E., et al. Inertization and reuse of waste materials by vitrification and fabrication of glass-based products. Curr. Opin. Solid State Mater. Sci., 2003, 7(3): 225.

[9] Karamanov A., Pisciella P., Pelino M. The crystallisation kinetics of iron rich glass in different atmospheres. J. Eur. Ceram. Soc., 2000, 20(12): 2233.

[10] Karamanov A., Pelino M. Crystallization phenomena in iron-rich glasses. J. Non Cryst. Solids, 2001, 281(1–3): 139.

[11] Pisciella P., Pelino M. Thermal expansion investigation of iron rich glass-ceramic. J. Eur. Ceram. Soc., 2008, 28(16): 3021.

[12] Sørensen P.M., Pind M., Yue Y.Z., et al. Effect of the redox state and concentration of iron on the crystallization behavior of iron-rich aluminosilicate glasses. J. Non Cryst. Solids, 2005, 351(14–15): 1246.

[13] Rüssel C., Wiedenroth A. The effect of glass composition on the thermodynamics of the Fe²⁺/Fe³⁺ equilibrium and the iron diffusivity in Na₂O/MgO/CaO/Al₂O₃/SiO₂ melts. Chem. Geol., 2004, 213(1–3): 125.

[14] Romero M., Rincón J. Ma., Acosta A. Effect of iron oxide content on the crystallisation of a diopside glass-ceramic glaze. J. Eur. Ceram. Soc., 2002, 22(6): 883.

[15] Yang H.Z., Chen C.P., Pan L.J., et al. Preparation of double-layer glass-ceramic/ceramic tile from bauxite tailings and red mud. J. Eur. Ceram. Soc., 2009, 29(10): 1887.

[16] Karamanov A., Ergul S., Akyildiz M., et al. Sinter-crystallization of a glass obtained from basaltic tuffs. J. Non-Cryst. Solids, 2008, 354(2–9): 290.

[17] Bernardo E., Esposito L., Rambaldi E., et al. Sintered esseneite-wollastonite-plagioclase glass-ceramics from vitrified waste. J. Eur. Ceram. Soc., 2009, 29(14): 2921.

[18] Marques V.M.F., Tulyaganov D.U., Agathopoulos S., et al. Low temperature production of glass ceramics in the anorthite-diopside system via sintering and crystallization of glass powder compacts. Ceram. Int., 2008, 34(5): 1145.