Biossolubilização da calcopirita (cufes<SUB>2</SUB>) na presença de íons cloreto
Mining currently has encountered great difficulties in obtaining high-grade ores due to depletion of mineral reserves. Conventional methods of extraction of metals (pyrometallurgy) present high energy costs and are unfriendly to the environment (e.g SO2 emissions). For this reason, alternative metho...
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| Autores principales: | , , |
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| Formato: | Objeto de conferencia |
| Lenguaje: | Portugués |
| Publicado: |
2012
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/26430 http://www.congresos.unlp.edu.ar/index.php/CCMA/7CCMA/paper/viewFile/901/324 |
| Aporte de: |
| Sumario: | Mining currently has encountered great difficulties in obtaining high-grade ores due to depletion of mineral reserves. Conventional methods of extraction of metals (pyrometallurgy) present high energy costs and are unfriendly to the environment (e.g SO2 emissions). For this reason, alternative methods to minimize operating costs and the environmental impacts have been required. Thus, the use of bacteria as catalyst for the leaching of low-grade ores is an interesting alternative for mining companies.
The main bacterium involved in bioleaching is Acidithiobacillus ferrooxidans, a microorganism chemolitotrofic and acidophilic that obtains energy through oxidation of ferrous ions and reduced sulfur compounds. This study used different strains of A.
ferrooxidans from the collection belonging to the Biohydrometallurgy laboratory (IQUNESP) and strain ATCC 23270. For this purpose, the mentioned strains were used for kinetic studies of oxidation of ferrous ions in the presence of different concentrations of chloride ions (mmol L-1): 0, 50, 100, 200, 400 e 500. Respirometric studies were also done in the presence of 50 mmol. L-1 of chloride ions, since this was the concentration in which all strains showed no significant inhibition. In kinetic studies the most tolerant strain was the AMF. Analyzing the respirometric data a crescent order of inhibition was proposed: (AMF ≈ LR ≈ V3) > ATCC> PCEL> SJ22> S> SSP> CMV> PCE. |
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