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Which of the following chemical compound, is the most common flux added to the charge in a cupola furnace?

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Which of the following chemical compound, is the most common flux added to the charge in a cupola furnace?

(a) Coke

(b) Methane

(c) Carbon dioxide

(d) Limestone

The question was asked in examination.

This intriguing question originated from Furnaces for Melting in section Pouring – Gating Design, Melting Furnaces, Melting and Casting Quality of Casting-Forming-Welding I

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Right choice is (d) Limestone

The explanation: Limestone (CaCO3) is used as Flux in cupola furnace in a proportion of about 2-4% of the metal charge.

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