Question

how to separate sulphate from iron

Answer 1

Sulphate can easily be separated from Iron Sulphate by heating on a strong flame.

Answer 2

Place the folded filter paper into a funnel, and wet it with water, to make it fit snugly in the funnel. Place the funnel safely in a ring clamp. Use this filter to separate the greenish liquid from any undissolved material by pouring the mixture into the paper.