The coal washing wastewater treatment project adopts advanced equipment belt filter press, which is a new type of solid-liquid separation equipment, widely used in clean coal, tailing coal, metallurgical sludge, papermaking, leather, chemical and other industrial waste Liquid solid-liquid separation. It has the characteristics of simple structure, convenient operation, continuous operation, automatic deviation adjustment, low noise, small footprint, power saving, convenient maintenance, etc., and can realize closed-circuit washing water cycle to reduce secondary environmental pollution.