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What is the melting point of Zircon?

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What is the melting point of Zircon?

(a) 3450°F – 4620°F

(b) 3750°F – 4820°F

(c) 3850°F – 4820°F

(d) 4400°F – 5320°F

I have been asked this question in an online quiz.

The doubt is from Indian Sand and core sand in chapter Molding and Core Sands of Casting-Forming-Welding I

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Right answer is (a) 3450°F – 4620°F

Easiest explanation: According to the properties of granular refractories, Zircon has a melting point temperature of 3450°F to 4620°F. Zircon is a kind of material which does not show much changes in physical aspects on exceedingly high temperatures.

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