About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alumina & Bauxite
|
| Presentation Title |
Technosols for Bauxite Mine Rehabilitation: Fertility and Biological Monitoring |
| Author(s) |
Vicente Sousa, Julio Cezar Fornazier Moreira, Norberto Cornejo Noronha, Jonilton Pantoja Paschoal, Adriano Reis Lucheta |
| On-Site Speaker (Planned) |
Jonilton Pantoja Paschoal |
| Abstract Scope |
The Hydro Paragominas Bauxite Mine, in Pará, Brazil, started in 2007 and currently process 11.4 million tons of bauxite annually. Paragominas mine effectively manages bauxite tailings using advanced dry backfill and post-mining rehabilitation techniques. A technosol is being developed in reclaimed mining areas by organic wastes amendments at rates of 0, 20 and 40 t.ha -1. Fertility was monitored by assessing physicochemical and biological properties in soil layers from 0 to 40 cm depth, during two seasons. In 2024, soils had higher organic matter (SOM), low cation exchange capacity (CEC), and base saturation, with microbial biomass affected by amendments. By 2025, SOM declined overall across treatments, indicating greater mineralization of organic inputs. Applying 20 t.ha-1 of sawdust or decayed wood raised SOM by up to 237% and 133%, respectively, and improved base saturation, exchangeable K+, and CEC. These results underscore the importance of organic amendments in mining areas rehabilitation. |
| Proceedings Inclusion? |
Planned: Light Metals |
| Keywords |
Aluminum, Extraction and Processing, Environmental Effects |