Question

how to separate the mixture of iron filings+sulphur+charcoal

Answer 1

To seperate Iron and Sulphur from the mixture by physical means. Do this by wrapping the end of a small bar magnet in a paper tissue or cling film, and dipping it into a teaspoon-sized heap of the mixture on a watch glass. The ironwill be attracted, but the sulfur remains on the watch glass.

Answer 2

magnetic separation could separate iron fillings from sulphur and charcoal, then froth floatation process