Abstract:Aiming at the problem that the solid-liquid separation of the plate and frame filter press is prone to harmful gas escaping and causing low altitude pollution, the technical research is carried out, and the sealing property of the plate and frame, the small hole diameter of the filter plate and the dehydration method of the filter cake are optimized and improved. After implementation,the sealing between the plate and frame is significantly enhanced, the flow efficiency of the filtrate in the filter cavity is improved,and the phenomenon of harmful gas spiltration is eliminated. The effect is remarkable and has a good value of popularization in the hydrometallurgical industry.