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Advisor(s)
Abstract(s)
Despite environmental pressures and intrinsic recycling potential, spent refractories waste is generally
considered an economically unattractive waste stream. This work proposes an upgraded view of the debris
recovered from dismantled spinel-bonded high-alumina linings of steel induction furnaces, demonstrating that
it can be reused in the form of vibratable and self-flowing castable systems. The recovered material retains the
microstructural distribution of in situ spinel formation without the corresponding disruptive expansion,
mirroring the use of pre-formed spinel without the onus of a pre-firing. The mechanical performance after firing
was found to be always best for the self-flowing system, which is also less affected by changes in added-water
content. There is potential for large usages of cleaned waste (50–60 wt%), which helps reducing the supply risk
for major refractory primary raw materials as well as landfilling costs.
Description
Keywords
Spinel-bonded Refractory Industrial waste Recycling Powders Particle size distribution Casting