| Revue: | Quimica nova |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000313440 |
| ISSN: | 0100-4042 |
| Autores: | Lemos, Vanda Porpino1 Costa, Marcondes Lima da Lemos, Ronaldo Lima Faria, Mario Sergio Gomes de2 |
| Instituciones: | 1Universidade Federal do Para, Centro de Geociencias, Belem, Para. Brasil 2Companhia de Pesquisa de Recursos Minerais, Manaus, Amazonas. Brasil |
| Año: | 2007 |
| Periodo: | Feb |
| Volumen: | 30 |
| Número: | 1 |
| Paginación: | 36-40 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Analítico, descriptivo |
| Resumen en inglés | Lateritic iron crust (LIC) samples from Padauari (AM) were analysed by XRD, optical microscopy and SEM-EDS. The equilibrium of iron minerals (IM) was studied using Eh-pH diagram. It was shown that the minerals of the LIC are goethite (alpha-FeOOH), vivianite [Fe3(PO4)2.8H2O] and siderite (FeCO3). Carbonate grains are a solid solution of FeCO3-MnCO3. The LIC presents textures and structures of dissolution of IM. The siderite and vivianite are stable from Eh =-0.3 to 0.0 V and pH=5.0-7.5. These results indicate that vivianite and siderite are products of bioreduction through biogenic dissolution of IM, the new conditions of ecosystems of the Amazon region |
| Disciplinas: | Ingeniería |
| Palabras clave: | Ingeniería metalúrgica, Biorreducción, Siderita, Vivianita |
| Keyword: | Engineering, Metallurgical engineering, Bioreduction, Siderite, Vivianite |
| Texte intégral: | Texto completo (Ver HTML) |
