Improved Corrosion Resistance of Alumina-Spinel Castable by Colloidal Alumina Addition
1 Federal University of São Carlos, Materials Microstructural Engineering, Group (FIRE Associate Laboratory), 13565-905 São Carlos/Brazil
2 Tata Steel Europe RD&T, Ceramics Research Centre, 1970–1976 IJmuiden/The Netherlands
Revision 04.07.2011, 09.09.2011
Volume 4, Issue 2, Pages 117 - 120
Abstract
Alumina-spinel castables are usually applied as a refractory lining of steel ladles in regions where both volumetric stability and corrosion resistance are required. However, the addition of the traditional calcium aluminate cement as a binder agent in those refractories leads to residual expansion and reduces the basic slag resistance, mainly due to the CA6 (CaO·6Al2O3) formation. In this work, a novel approach was designed in order to improve the performance of these materials, by using alumina-based binder agents: hydratable alumina and colloidal alumina. The results highlighted a reduced corroded area after the slag tests for the latter, which was most likely associated with the decrease in the average pore size. Therefore, the use of these nano-scaled alumina particles points out a promising technique to produce alumina-spinel castables for key regions in the steel ladle.
Keywords
colloidal alumina, aluminaspinel, castables, corrosion resistance
References
[1] Schmidtmeier, D.; Büchel, G.; Buhr, A.: Magnesium aluminate spinel raw materials for high performance refractories for steel ladles. Ceram. Mater. 61 (2009) [4] 223–227
[2] Buhr, A.: Refractories for steel secondary metallurgy. CN-Refractories 6 (1999) [3] 19–30
[3] Quintela, M.A.; et al.: Refractories selection for steel ladles. Proc. UNITECR 2005, Orlando, USA, 380–385
[4] Mori, J.; et al.: Effect of slag composition on wear of alumina-spinel castable for steel ladle. Taikabutsu Overseas 12 (1992) [1] 40–45
[5] Itose, S.; et al.: Improvement in the durability of alumina-spinel steel ladle castable containing spinel fine powder. J. Technical Ass. of Refractories 22 (2002) 26–30
[6] Parker, K.; Sharp, J.H.: Refractory calcium aluminate cements. Transactions Brit. Ceram. Soc. 82 (1982) [1] 35–42
[7] Sako, E.Y.; et al.: Microsilica role in the CA6 formation in cement-bonded spinel refractory castables. J. Mater. Process. Tech. 209 (2009) 5552–5557
[8] Sako, E.Y.; et al.: The impact of pre-formed and in situ spinel formation on the physical properties of cement-bonded high-alumina refractory castables. Ceram. Int. 36 (2010) 2079– 2085
[9] Braulio, M.A.L.; et al.: Basic slag attack of spinel- containing refractory castables. Ceram. Int. 37 (2011) [6] 1935–1945
[10] Cardoso, F.A.; et al.: Drying behaviour of hydratable alumina-bonded refractory castables. J. Europ. Ceram. Soc. 24 (2004) [4] 797–802
[11] Lipinski, T.R.; Tontrup, C.: The use of nanoscaled alumina in alumina-based refractory materials. In: Proc. UNITECR 2007, Dresden, Germany, 391–393
[12] Braulio, M.A.L.; et al.: In situ sinel expansion design by colloidal alumina suspension addition. J. Am. Ceram. Soc. 92 (2009) [5] 559–562
[13] Mori, J.; et al.: Material design of monolithic refractories for steel ladle. Am. Ceram. Soc. Bull. 69 (1990) [7] 1172–1176
[14] Luz, A.P.; et al.: Thermodynamic evaluation of spinel containing refractory castables corrosion by secondary metallurgy slag. Ceram. Int. 37 (2001) 1191–1201
Copyright
Göller Verlag GmbH
