Process method for treating mine acidic waste water

Abstract

The invention discloses a process method for treating mine acidic waste water. The method comprises the steps of performing primary precipitation, performing primary filtration, performing secondary precipitation and performing secondary filtration. By the method, the pH value of the mine acidic waste water can be regulated to 6 to 8, the national standard of the mine waste water pH emission is achieved, and the antimony content of the antimony well waste water can be reduced below 0.5 mg / L provided by 'Guizhou Province Environmental Pollutant Emission Standard'. The method has a good effect of treating the heavy metal mine waste water.

Description

technical field [0001] The invention relates to a process method for treating mine wastewater, in particular to a process method for treating acid mine wastewater. Background technique [0002] In my country's Guizhou Province, there are a large number of mineral resources, and most of the mines exist in the form of sulfide ore. During the mining process of these mineral resources, under the action of microorganisms and oxygen in the air, through S 2- → SO 4 2- After the process sulfate compounds are formed which dissolve in water. This not only increases the concentration of heavy metal ions in the water, but also reduces the pH value in the water. [0003] At present, domestic and foreign treatment methods for mine acid wastewater mainly include micro-electrolysis technology, chemical method (precipitation method), membrane treatment method, microwave method and physical method (adsorption method). The above processing technologies have been applied to a certain exten...

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Problems solved by technology

The above processing technologies have been applied to a certain extent due to their respective advantages, but they are also difficult to be popularized due to their respective shortcomings and limitations.

Micro-electrolysis technology mainly uses iron filings and carbon particles as micro-electrolysis fillers. Therefore, after a period of water treatment reaction, adverse phenomena such as blockage and agglomeration will occur. At the same time, there are problems before and after the micro-electrolysis reaction. The problem of pH adjustment, the cost is higher

Due to the serious secondary pollution of sulfur and the high cost of vulcanizing agents, the application of the sulfide precipitation method is limited.

Membrane treatment technology can effectively treat mine acid wastewater to a certain extent, but the service life of the membrane and the high cost of membrane preparation and maintenance prevent this technology from being widely promoted.

The microwave method has high processing costs, high energy consumption, and expensive equipment maintenance costs, and is mainly suitable for the treatment of wastewater containing organic matter

The adsorption method essentially relies on the adsorption of heavy metal ions on the active surface of the adsorbent to remove heavy metal ions. There are many types of adsorbents, the most common being activated carbon, but activated carbon has a slow adsorption rate and a small adsorption capacity, which is not suitable for dealing with the concentration of pollutants. High waste water, at the same time, the activated carbon regeneration process is complex, which also limits its scope of use

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