Why are there fumes while heating melamine to graphitic carbon nitride ?

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Jürgen Weippert

What publication are you basing your method on? Is there a literature indicator that this should work?

Melamine decomposes at 280°C and contains a lot of nitrogen; decomposing high-nitrogen material is a classic strategy for making explosives.

Addition: I just found a (German) safety data sheet on which it says that the ignition temperature for a dust layer (Mindestzündtemperatur der Staubschicht) is 450°: https://www.gischem.de/download/01_0-000108-78-1-000000_1_1_400.PDF

So I would say you're lucky there was no severer incident.