What are the primary characteristics of fireclay refractories___________________?
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Answer: D. All A., B. and C.
Explanation
Fireclay refractories are acidic and react aggressively with basic slag. They combine with basic fluxes and salts to form low-melting eutectic compounds. Volumetric shrinkage occurs during high-temperature firing and service. Fireclay consists mainly of hydrated aluminum silicates with varying silica ratios. Basic oxides like lime and magnesia attack the silica matrix of fireclay bricks. High-temperature firing causes densification and associated dimensional shrinkage.
Metallurgical slag containment requires matching refractory acidity to slag chemistry. Furnace lining longevity depends on avoiding incompatible chemical interactions. Selecting basic bricks prevents premature failure in basic steelmaking furnaces. Option A is correct but only represents one specific limitation of fireclay. Option B is correct but represents only the chemical reactivity aspect. Option C is correct but describes only the physical shrinkage characteristic.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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