Study on generation mechanism of acid drainage from a waste stone coal mine in Ziyang,Shaanxi Province
In the natural environment,pyrite is prone to be oxidized,and results in AMD(acid mine drainage)pollution,which threat-ens human health and safety.The associated pyrite and heavy metals(cadmium,nickel,vanadium,manganese,zinc,etc.)in stone coal and gangue are complex.Through long-term soaking and leaching of atmospheric rainfall,surface water,and bedrock fissure water,acid water is produced,which aggravates the dissolution of toxic and harmful heavy metal elements.AMD has become one of the most difficult problems for mine environmental restorers because of its large output,long formation time span and scattered production sources.This paper analyzed the samples of waste stone coal mine in Ziyang,Shaanxi Province,grasped the chemical composition and mineral compo-sition of the waste residue,and found out the root cause for the generation of acid water.This paper was based on the national standard Solid waste-Extraction procedure for leaching toxicity-Horizontal vabration method(HJ 557-2010),After crushing the samples,soaking them in distilled water,aeration,and sealing were used to simulate the process of acidic water production in natural environments.Dur-ing the process,water samples were collected regularly for analysis and determination,providing a basis for subsequent remediation and management in mines.In the process,water samples were collected regularly for analysis and determination,so as to provide a basis for subsequent restoration and treatment of the mine.
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