|
| Effect of Rainfall pH Value on Release Behavior of Heavy Metals and SO42- from Coal Gangue |
|
Received:September 28, 2022
Revised:October 04, 2022
Accepted:October 08, 2022
Published Online:December 19, 2022
|
| View Full Text View/Add Comment Download reader |
| DOI：doi：10.3969/j.issn.1007-7545.2023.01.014 |
| KeyWord:high-sulfur coal gangue; acid rain pH; heavy metals; SO42-; release rule; kinetics behavior |
| Author | Institution |
| LU Huan |
北京科技大学能源与环境工程学院 |
| DONG Ying-bo |
北京科技大学能源与环境工程学院 |
| LIN Hai |
北京科技大学能源与环境工程学院 |
|
| Hits: 1535 |
| Download times: 1568 |
| Abstract: |
| The release rules and kinetic behaviors of heavy metals (Mn, Cu, Zn) and SO42- from coal gangue were investigated under the conditions of simulated rainfall pH value of 2, 3, 5 and 7 respectively using static leaching test with high sulfur coal gangue as the research object. The results show that the acidic conditions are more favorable for the release of heavy metals and SO42-, which shows a trend of rapid release followed by gradual stabilization with increasing of time. The cumulative release of Mn, Cu and Zn is the highest at rainfall pH value of 3, reaching 60.40, 29.11 and 5.86 mg/kg, respectively. The cumulative release of SO42- is biggest at the precipitation pH value of 2, reaching 25 027.27 mg/kg. The kinetics results show that heavy metals release is controlled by interfacial chemical reactions, while SO42- is controlled by interfacial and diffusive mixing of solid film layers, and a large amount of H+ is generated during the release of heavy metals and SO42-, which makes the leachate pH<1.52. The results of this study can provide a theoretical basis for heavy metals and SO42- pollution prevention, control, and regulation in coal gangue dumps from the perspective of pollutant release at source. |
| Close |
|
|
|