Question

why is the melting point of graphite is high

Answer 1

The weak van der Waals' forces between the hexahedral layers increases the distance. Even though this much is enough for conduction, this is not enough for breakdown of graphite. Also, the strong covalent bond is also responsible for high melting point

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Answer 2

As its covalent bonds are very strong, and there are many of them, a lot of energy would be needed to separate atoms. This makes graphite's melting point and boiling point very high. However, each carbon atom is only covalently bonded to three other carbon atoms, rather than to four as in diamond.