Optimization of Properties for Alumina-Spinel Refractory Castables by CMA (CaO-MgO-Al2O3) Aggregates

Abstract

Aiming at optimizing properties of alumina-spinel refractory castables, coarse corundum particles were replaced partially with the particles of a novel porous multi-component CMA (CaO-MgO-Al2O3) aggregate in the same size. Properties including the bulk density, apparent porosity, strength, slag corrosion resistance, thermal shock resistance and thermal fatigue resistance of alumina-spinel refractory castables containing CMA aggregates were evaluated contrastively. The results demonstrated that the incorporation of CMA aggregates can significantly improve thermal shock resistance and thermal fatigue resistance of castables, although companying with slight decrease in the bulk density and strength. Moreover, slag penetration resistance of castables can also be enhanced by CMA aggregates with appropriate particle size. The influence of CMA aggregates on properties of alumina-spinel refractory castables depended strongly on their particle size.

Study on preformed and in situ spinel containing alumina castable for steel ladle: Effect of fume silica content

“…Both alumina-spinel and alumina-magnesia castables are used in steel ladle lining in the secondary steelmaking process to meet several requirements, like cleaner steel production, improving the efficiency of steel, and optimizing the labor cost. [1][2][3][4][5][6] It has a unique combination of properties, such as high strength at elevated temperatures, excellent corrosion, and good thermal shock resistance. [7][8][9] This kind of property is ideal for steel ladle application where the refractory lining must withstand the intense operating conditions of the secondary refining process.…”

“…Both alumina—spinel and alumina—magnesia castables are used in steel ladle lining in the secondary steelmaking process to meet several requirements, like cleaner steel production, improving the efficiency of steel, and optimizing the labor cost 1–6 . It has a unique combination of properties, such as high strength at elevated temperatures, excellent corrosion, and good thermal shock resistance 7–9 .…”

Solution combustion synthesis of FeCr 2 O 4 powders for pigment applications: Effect of fuel type

“…Spinel structure materials with the general formula of AB 2 O 4 , where A(II) and B(III) are cations, have wide range structural and functional properties. They are employed in various fields of ceramic applications, including refractories, 1 transparent from Vis to IR region, 2,3 luminescent application, 4 spectrally selective absorber coatings, photocatalysts, 5,6 pigments, 7 and magnetic devices. 8,9 Chromite powders were synthesized by several methods such as solid-state reaction, 10,11 hydrothermal, 12,13 coprecipitation, 14,15 sol-gel, 16,17 single crystal growth via flux-growth method, 18 and solution combustion method.…”

Investigating the Action Mechanism of Titanium in Alumina–Magnesia Castables by Adding Different Ti-Bearing Compounds

“…Alumina-magnesia castables served at high temperatures mainly comprise alumina, spinel, and CA 6 . The presence of spinel can improve the slag corrosion and erosion resistances of castables due to its high chemical resistance and mechanical properties [1][2][3][4]. Ko [5] reported that alumina-magnesia castables had better slag resistance than aluminaspinel castables, because the in-situ spinel possessed smaller grain sizes.…”