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Limestone removes sulphur from cast iron.

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+1 vote
in Foundry and Forging by (110k points)
Limestone removes sulphur from cast iron.

(a) True

(b) False

The question was posed to me in an online interview.

This intriguing question originated from Raw Materials for Foundry in division Foundry Introduction of Foundry and Forging

1 Answer

+1 vote
by (736k points)
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Best answer
Right choice is (a) True

The explanation: Limestone is chemically known as sodium carbonate. It is used in cupola while melting cast iron. It gives rise to a slag which removes sulphur from cast iron in foundry processes.

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