Refractory Technology
Addition of zircon to silica refractory brick improves its

Crushing strength
Resistance to slag attack
Neither A nor B
Neither A nor B

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Refractory Technology
Fireclay refractories

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

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