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What is the melting point of Silica, for granular refractories?

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What is the melting point of Silica, for granular refractories?

(a) 3453°F

(b) 3206°F

(c) 3119°F

(d) 3467°F

I have been asked this question in an international level competition.

I'm obligated to ask this question of Indian Sand and core sand topic in chapter Molding and Core Sands of Casting-Forming-Welding I

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Correct choice is (c) 3119°F

For explanation: According to the properties of granular refractories, Silica has a melting point temperature of 3119°F. The melting points of silica and chamotte are calculated to be almost equal.

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