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Why is sand used as a bed for melting of metal in Cupola furnace?

Why is sand used as a bed for melting of metal in Cupola furnace?
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Why is sand used as a bed for melting of metal in Cupola furnace?

User Praethorian
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Answer:

A sand bed is necessary because it provides a refractory bottom for molten metal

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User Graham Christensen
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