Polyacrylamide is used in mining, processing and tailings treatment of minerals such as coal, gold, silver, copper, iron, lead, zinc, aluminum, uranium, nickel, phosphorus, potassium, manganese, and salt. The main purpose is to improve solid-liquid separation. Efficiency and recovery; where in the coal industry, coal slurry and tailings settling and clarification, tailings filtration and solid-liquid separation during centrifugation; in gold or silver or copper mines, settling added to the thickener before the filter tank In the mineral solution with low pH value (less than 4), such as lead-zinc ore, it is used for sedimentation additives, etc.; in aluminum ore, after the sodium aluminate solution and red mud are separated, it is added during the washing process. An adjuvant to promote rapid sedimentation of red mud particles to obtain a clarified overflow that meets the requirements.