Refractory Technology
Silica refractories are not used in

Beehive coke ovens
Open hearth furnace roof
Coke oven walls
Dome and upper portion of B.F. stoves

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Refractory Technology
Fireclay refractories

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

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