Process for treating mine wastewater containing sulfur minerals, As, Pb and Cd

Abstract

The invention discloses a process for treating mine wastewater containing sulfur minerals, As, Pb and Cd, which comprises the following steps: (1) performing blast aeration and oxidation treatment on the mine wastewater containing the sulfur minerals, As, Pb and Cd in an aeration tank; (2) neutralizing and coagulating the wastewater after the aeration and oxidation in a neutralization tank and controlling the pH to be between 8.6 and 9.5; (3) standing and depositing the wastewater after the neutralization and the coagulation treatment in a sedimentation tank; and (4) after the wastewater is clear after standing for a certain period of time, performing advanced treatment on heavy metal in a supernatant in a physical and chemical adsorption device and an activated carbon filtering system to obtain clean water meeting the environmental-protection or agricultural requirement. Through the process, peculiar smell in the mine wastewater can be eliminated, the wastewater color is changed to be normal, and the requirement of the quality of mine wastewater containing the discharged sulfur minerals, As, Pb and Cd in 'Standards for irrigation water quality' (GB5084-2005) can be met.

Description

technical field [0001] The invention relates to a treatment process of mine wastewater, in particular to a treatment process of mine wastewater containing sulfur minerals, As, Pb, Cd and other heavy metal elements. It is widely used in the comprehensive treatment of reservoir overflow water and mine water gushing. Background technique [0002] Most of the ores in metal mines at home and abroad contain sulfide ores. Sulfide ores are widely distributed and abundant in nature. They can appear in almost all geological ore bodies, especially metal deposits such as copper, lead, and zinc. These sulfide minerals are in the air. Under the action of water, microorganisms, a series of physical and chemical reactions such as leaching, oxidation, and hydrolysis occur, and acidic wastewater is easily formed. These acidic wastewaters have low pH, high acidity, and contain a large amount of toxic and harmful heavy metals. They are the main source of wastewater containing heavy metal ions ...

AI Technical Summary

Problems solved by technology

[0004] ①Heavy metal pollutants cannot be decomposed into harmless substances in the natural environment, but can only change in form or transfer between different phases. In these processes, their toxicity has not been fundamentally eliminated. Improperly, heavy metal ions will dissolve back into the water, causing harm again and forming "secondary pollution";

For example, the overflow water of a copper mine in China has the following phenomena during the tailing process: (1) the color is abnormal, and the overflow water sometimes appears green and milky white; (2) there is a peculiar smell. (3) The water quality index exceeds the standard. After sampling and testing, the sulfide and heavy metal elements such as As, Pb, and Cd in the overflow water exceed the standard.

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