High-hardness and high-sulfate type coal mine water treatment method and device

The invention provides a short-process zero-emission treatment method and device for high-hardness and high-sulfate type coal mine water, which comprises the following steps: firstly, carrying out coagulation clarification treatment to remove coal powder, colloid and other substances, then carrying out chemical softening to remove calcium, magnesium and silicon, further filtering the effluent, adjusting the pH value to 7.8-8.3, and carrying out treatment on the effluent to obtain the high-hardness and high-sulfate type coal mine water. Sequentially carrying out ultrafiltration, weak acid cation exchange, carbon dioxide removal, reverse osmosis desalination, disc tube type nanofiltration synchronous salt separation and concentration, and evaporative crystallization, so as to realize zero emission of the high-hardness and high-sulfate type coal mine water. Aiming at the water quality characteristics of coal mine water with high hardness, high sulfate, low COD (Chemical Oxygen Demand) and low chloride, the zero-