screw sand washer 1 high wasing speed 2.less loss of medium and dine sand 3.ISO9001:2000 4.fine after-sale service screw sand washer working principle:1. Electric motor rotates impeller slowly through V-belt and reduction box.2. The sands rotate with the impeller and rub each other so that the impurities on the surface of the sands are scaled off.3. By adding water to form a powerful current, the ...