In the coal mining industry, nanofiltration membrane technology is mainly used for mine wastewater treatment and resource recovery. Through membrane separation processes such as ultrafiltration, nanofiltration, and reverse osmosis, coal dust, heavy metal ions, and dissolved salts in wastewater can be effectively removed, enabling the purification and reuse of mine water and significantly reducing water consumption. At the same time, valuable minerals can be recovered from the wastewater, solving environmental problems in coal mines while improving resource utilization.