Investigating the formation of acid mine drainage of Toledo pyrite concentrate using column cells

2017 International Conference on Power and Energy Engineering

Aguila, Diosa Marie^1

Batangas State University, Batangas City

4200, Philippines^1

关键词: Acid mine drainage;    Adverse effect;    Column experiments;    Column test;    Pyrite oxidation;    Pyrite surfaces;    Rehabilitation methods;    Surface area;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/114/1/012008/pdf
DOI  :  10.1088/1755-1315/114/1/012008

来源: IOP

【 摘 要 】

Acid mine drainage (AMD) is an inevitable problem in mining and has adverse effects in water quality. Studying AMD formation will be valuable in controlling the composition of mine waters and in planning the rehabilitation method for a mine. In this research, kinetics of AMD formation of Toledo pyrite was studied using two column experiments. The mechanisms of AMD formation and the effects of various factors on pH drop were first studied. Another column test was done for validation and to study the role of Fe2+/Fe3+ratio in the change of leachate pH. The first experiment revealed that time and particle size are the most significant factors. It was also observed that the sudden pH drop during the starting hours was due to cracks formed from beneficiation, and the formation of Fe(OH)3. The laddered behavior of pH thereafter was due to decrease in formation of Fe(OH)3, and the precipitates in pyrite surface that lowered the surface area available for pyrite oxidation. The results of the second experiment validated the laddered behavior of pH. It was also observed that particle size distribution and pyrite surface were affected by the change in pH. Fe2+/Fe3+ratio of leachate generally decreased as pH dropped.