... 3. Convenient operation; 4. High efficiency. Spiral Grader1. Usage: Spiral Grader is one of the most widely used ... of ore washing. 2. Structure: Spiral Grader is consist of driving device, spiral, flume, lifting device, lubrication device, ... high weir type, single and double spiral, and immersed single double spiral classifiers. ModelTypeScrewDiamete(mm)ScrewSpeedm/(min)CapacityFlumeslope(°)Driving ...