... scientific product, which is the best concentrating equipment, especially for concentrating sand ore in beach, riverside, seashore and stream.The ... particle size 0.3-0.02 millimeters fine grain like iron, tin, chromite, ilmenite, tungsten, zinc, tantalum-niobium, gold, coal ... spiral separator to be selected by colored, ferrous metal mine, coal chemical industry, coal dressing, sulfur factory as ...