A mixture of rice and flour grains can be separated by sieving. The flour being finer will remain on the sieve and the rice being larger remains on the sieve.Sieving allows the fine flour particles to pass through the holes of the sieve while the bigger impurities remain on the sieve.In a flour mill, impurities like husk and stones are removed from wheat before grinding it. Usually, a bagful of wheat is poured on a slanting sieve. The sieving removes pieces of stones, stalk and husk that may still remain with wheat after threshing and winnowing.
