Way of separating iron fillings from sulphur powder

By the use of a magnet.

Explanation:

Since sulphur powder is not magnetic then passing a magnet over the mixture spread over a clean surface will only attract the ferro-magnetic iron.

Sulphur will be left on the surface while iron will be left on the flat surface.

Answer:use of a magnet

Explanation:

Iron filling is a magnetic material hence can be retrieved using a magnet.