When the slime content of raw ore is over 40% and most of clay is sticky, the ordinary washer is difficult to effectively and fully disperse the clay, resulting in complicated washing process and increased cost. At this time, a more efficient ore washer -- rotary scrubber becomes an indispensable equipment. The rotary scrubber uses a rotating cylinder and internal scraper, water, as well as natural pebbles and rocks in the material, to disintegrate clay, lumps and soft oxides.