Abstract
High performance MgO-based castables have many advantages for refining clean steel. However, hydration of MgO powder limits the application of MgO-based castables. The effects of temperature, hydration time and additives (calcium aluminate cement and microsilica) on the hydration behaviour of MgO powders are investigated in this paper. The results show that the hydration content of MgO powders increases noticeably with an increase of hydration time and temperature, indicating that the intensity of brucite (Mg(OH)2) diffraction peaks and the brucite amount increase. With 5 mass-% microsilica or cement addition, the amount of hydrated product Mg(OH)2 decreases noticeably from 26 to 11 mass-% and 19 mass-%. Microsilica has a retarding influence on the hydration of magnesia.
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Sandberg, B., Myhre, B., Holm, J.L.: Castables in the system MgO-Al2O3-SiO2, Proc. of UNITECR ’95, Kyoto, Japan, (1995) 173–180
Li, N., Wei, Y.W., Wu, H.P., et al.: Properties of MgO castables and effect of reaction in mcrosllica MgO bond system. Proc. of UNITECR’99, Berlin, Germany, (1999) 97–102
Zhou, N.S., Zhang, S.H., Hu, S.H., et al.: MgO-SiO2-H2O bonded MgO based castables, Part 2: Effect of pumping and wet shotcreting on cold and hot properties and slag resistance. Proc. of UNITECR’ 03, Osaka, Japan, (2003) 272–275
Layden, G.K., Brindley, G.W.: Kinetics of vapor-phase hydration of magnesium oxide. J Amer. Ceram Soc 46 (1963) [11] 518–522
Kitamura, A., Onizuka K., Tanaka, K.: Hydration characteristics of magnesia. Taikabutsu Overseas 16 (1995) [3] 3–11
Saloma, R., Pandolfelli, V.C.: Magnesia sinter hydration-dehydration behavior in refractory castables. Ceram Internat. 34 (2008) [8] 1829–1834
Yoschida, A., Nemoto, T., Kaneyasu, A.: Evaluation method for hydration resistance of magnesia fine powder and effect of B2O3 content in magnesia raw materials. Proceedings of UNITECR’03, Osaka, Japan, (2003) pp. 433–436
Kaneyasu, A., Yamamoto, S., Yoshida, A.: Magnesia raw materials with improved hydration resistance. Taikabutsu Overseas 17 (1996) [2] 21–26
Ahari, K.G., Sharp, J.H., Lee, W.E.: Hydration of Refractory Oxides in Castable Bond Systems II: Alumina Silica and Magnesia Silica Mixtures. J. Europ. Ceram Soc. 23 (2003) [16] 3071–3077
Sako, E.Y., Braulio, M.A.L., Pandolfelli, V.C.: Microstructural evolution of magnesia-based castables containing microsilica. Ceram. Internat. 38 (2012) [8] 6027–6033
Salomao, R., Pandolfelli, V.C.: The role of hydraulic binders on magnesia containing refractory castables: Calcium aluminate cement and hydratable alumina. Ceram. Internat. 35 (2009) [8] 3117–3124
Amaral, L.F., Oliveira, I.R., Bonadia, P., et al.: Chelants to inhibit magnesia (MgO) hydration. Ceram. Internat. 37 (2011) [5] 1537–1542
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Jia, Q., Zhang, J., Ge, T. et al. Effect of Temperature and Additives on the Hydration Behaviour of MgO Powders. Interceram. - Int. Ceram. Rev. 63, 133–135 (2014). https://doi.org/10.1007/BF03401048
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DOI: https://doi.org/10.1007/BF03401048