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Bacterial leaching of waste uranium materials
Zeitschrift Fur Allgemeine Mikrobiologie
|January 1, 1976
Summary
This study shows that using ferrobacteria and thiobacteria can significantly enhance uranium recovery from waste materials. Adding pyrite further boosts leaching efficiency while reducing acid consumption.
Area of Science:
- Biomining
- Hydrometallurgy
- Environmental Science
Background:
- Investigated the bioleaching of uranium from low-grade waste materials.
- Utilized native ferrobacteria and thiobacteria from Yugoslavian ore and mine water.
- Classical chemical hydrometallurgical methods had already extracted 70-80% of the uranium.
Purpose of the Study:
- To evaluate the effectiveness of ferrobacteria and thiobacteria in leaching residual uranium.
- To optimize bioleaching parameters for increased uranium recovery.
- To assess the impact of pyrite addition on uranium bioleaching.
Main Methods:
- Laboratory-scale experiments on waste uranium materials.
- Cultivation and application of ferrobacteria and thiobacteria.
- Varied leaching conditions, including sulfuric acid concentration and pyrite addition.
Main Results:
- Uranium leaching was directly proportional to ferrobacteria and thiobacteria populations.
- Bioleaching with bacteria nearly doubled uranium recovery compared to non-biological methods.
- Pyrite addition increased uranium leaching by up to 20% and decreased sulfuric acid consumption.
- Achieved approximately 60% uranium recovery from materials with very low initial concentrations.
Conclusions:
- Ferrobacteria and thiobacteria show significant potential for enhancing uranium recovery from low-grade waste.
- Optimizing bioleaching conditions and using amendments like pyrite can improve efficiency and reduce costs.
- Bioleaching offers a viable method for extracting valuable metals from previously processed materials.