2021-4-27 · A sand washing plant in Sichuan, China, has greatly improved its work efficiency after using the LZZG screw sand washer machine. Large capacity screw sand washer capacity 100~300t/h. Advantages of using screw sand washer. 1. This sand screw is muti-functions: cleaning, dewatering, and grading. 2. Cleaning and upward conveying at the same time. 3.