Before operation, check whether the main shaft turns clockwise. If not, then change phase sequence of the power source to make the motor turns clockwise before operation. Mix mineral samples and water and then pour them into the cell. Start up the motor to drive the main shaft for rotation. The impeller will agitate in the cell. Then open the valve for air inflation and add chemical agent to form foams. Turn on switch of the scraper motor (8) for rotation of the scraper to scrape foams out of the cell. A box is set on the working table to receive foams. Minerals needed can be obtained after processing of the foams.