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| Titel: |
Biologically enhanced dissolution of a pyrite-rich black shale concentrate |
| Auteur: |
Tasa, Andrus Vuorinen, Antti Garcia, Oswaldo Tuovinen, Olli H. |
| Verschenen in: |
Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering |
| Paginering: | Jaargang 32 (1997) nr. 9-10 pagina's 2683-2695 |
| Jaar: |
1997-10 |
| Inhoud: |
The acid leaching of a pyrite-rich black shale concentrate (7% S) was tested in this study. The experiments were performed at 5-30% pulp densities and with inoculations of Fe- and S-oxidizing thiobacilli (Thiobacillus ferrooxidans, and Thiobacillus thiooxidans,),. Cultures supplemented with S0 showed strong acid production, with final pH values of 0.9 in T. ferrooxidans, cultures and 0.4-0.5 in the presence of T. thiooxidans,. Fe dissolution was pronounced in the T. ferrooxidans, culture whereas T. thiooxidans, did not dissolve Fe from the black shale. Total dissolved Fe concentrations were 3 to 50 times higher in the cultures inoculated with T. ferrooxidans, when compared to T. thiooxidans, and sterile controls. The dissolution of Mo was enhanced in the inoculated cultures as compared with the chemical controls. With V, Si, and Al this effect was not as pronounced but was still discernible in solutions acidified by bacterial oxidation of S0. The leaching experiments suggested that the black shale was inhibitory to the inocula. The inhibition was related to the pulp density and was associated with the leach solution. The inhibition could be completely alleviated by replacing the leach solution. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 2 van 23 gevonden artikelen
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