Refractory Technology
Fireclay refractories

Are not resistant to the action of basic slags
Combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc
All of these
Shrink during firing

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Refractory Technology
What is Thoria?

Thoria Has high resistance to basic slags
Which is expensive & radioactive, is used in crucibles for melting high purity metals
Thoria Has high fusion temperature (> 3000°C) but poor resistance to thermal shock
All of these

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