ZENG Xiangying1, HAN Zhiwei1,2, WU Pan1,2, ZHANG Ruixue1,2, CHEN Zhuo1
（1.College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China;
2.Key Laboratory of Process and Control of Mining Environmental Pollution, Colleges and Universities in Guizhou Province, Guiyang 550025，China）
Abstract: The acidic drainage generated by mining processes together with heavy metals it carried have caused serious damage to ecological environment. The acid controlling is the key prevention and control process. Understanding the acidification process of mine water is of theoretical significance to the prevention and source control of acid drainage in mining areas. In this paper, the Dushan Banpo Mine was selected as the study area and 32 different water samples were collected from this area. The acidification process of mine water was revealed by the end-acid analysis of acidified minerals in water, the co-oxidation process of heavy metals, the ion hydrolysis process and the mixing process of different types of mine water. The results showed that the oxidation of stibnite and pyrite in the mine resulted low pH and high sulfate content in the mine water flow, significantly different from the groundwater flow with no impact of mining activities. The co-oxidation processes of Sb(III) and Fe(II) in the mine water flow consumed hydrogen ion, and bicarbonate bufferred acid in the mixing of different waters, such delayed the acidification of mine water. Al, Mn and Fe were soluble in acidic water, and the hydrolysis process of these ions might further accelerate the acidification of mine water.
Key words: acidic drainage of antimony mine; acidification process; co-oxidation process; mixing process
EARTH AND ENVIRONMENT Vol.48, No.1, Tot No.333, 2020, Page 30-37