Hazards of mine wastewater

　　The harmfulness of mine wastewater, the editor of Main Point Blue believes, refers to the damage to the environment, the poisoning of organisms and the damage to mining equipment.

　　1. The flotation reagents remaining in the mineral processing wastewater, after being discharged into the water body, change the pH of the water body, resulting in an increase in CO2 and eutrophication of the water body, such as phosphate mineral processing wastewater; most metal and non-metallic ores contain sulfides. If the content of useful elements in the sulfide is very low, it is piled up in the waste rock pile or tailings pond as gangue minerals. Under the action of external natural conditions, the tailings containing the sulfide are rapidly oxidized to form high-concentration acidic wastewater, which acidifies the nearby water quality and soil, affects the growth of crops, and damages the ecological environment.

　　2. If the acidic wastewater produced by the mine is discharged into lakes and rivers in large quantities, the pH value of the water body will decrease, which will not only affect the growth and reproduction of microorganisms in the water, but also cause the death of aquatic organisms such as fish and shrimp; after entering the water body, the metal ions in the wastewater will migrate and change in the water body through a series of actions such as precipitation, absorption, complexation, chelation and oxidation-reduction, and ultimately affect the growth of aquatic organisms and human health.

　　3. Strongly acidic and alkaline wastewater will also cause strong corrosion and scaling to water pump accessories, pipes and tunnel equipment, causing damage to equipment and blockage of pipelines, directly affecting the normal production of the ore dressing plant.