What is thee method called when you separate rice from flour?

The method used to separate rice from flour is called winnowing. Winnowing is a traditional technique that makes use of the difference in weight and size between rice and flour. It involves tossing the mixture of rice and flour into the air, allowing the heavier rice grains to fall back down while the lighter flour particles are carried away by the wind. This process can be repeated several times until the rice and flour are effectively separated.