| dc.contributor | Universidade Estadual Paulista (UNESP) | |
| dc.creator | Ossa Henao, Diana Marcela | |
| dc.creator | Marquez Godoy, Marco Antonio | |
| dc.date | 2014-05-20T15:31:17Z | |
| dc.date | 2016-10-25T18:07:04Z | |
| dc.date | 2014-05-20T15:31:17Z | |
| dc.date | 2016-10-25T18:07:04Z | |
| dc.date | 2010-09-01 | |
| dc.date.accessioned | 2017-04-06T00:21:27Z | |
| dc.date.available | 2017-04-06T00:21:27Z | |
| dc.identifier | Hydrometallurgy. Amsterdam: Elsevier B.V., v. 104, n. 2, p. 162-168, 2010. | |
| dc.identifier | 0304-386X | |
| dc.identifier | http://hdl.handle.net/11449/40468 | |
| dc.identifier | http://acervodigital.unesp.br/handle/11449/40468 | |
| dc.identifier | 10.1016/j.hydromet.2010.05.012 | |
| dc.identifier | WOS:000282191600007 | |
| dc.identifier | http://dx.doi.org/10.1016/j.hydromet.2010.05.012 | |
| dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/883238 | |
| dc.description | In this work, the oxidizing action of a native strain type A. ferrooxidans on a sulphide containing a predominance of arsenopyrite and pyrite has been evaluated. Incubation of the A. ferrooxidans strain in flasks containing 200 mL of T&K medium with the ore (particle size of 106 mu m) at pulp density 8% (w/v) at 35 degrees C on a rotary shaker at 200 rpm resulted in preferential oxidation of the arsenopyrite and the mobilization of 88% of the arsenic in 25 days. Mineralogical characterization of the residue after biooxidation was carried out with FTIR. XRD and SEM/XEDS techniques. An in situ oxidation of the arsenopyrite is suggested on the basis of the frequent appearance of jarosite pseudomorph replacing arsenopyrite, in which the transformations Fe(2+) -> Fe(3+), S(-2) -> S(+6) and As(-1) -> As(+3) -> As(+5) occur for the most part without formation of soluble intermediates, resulting in a type of jarosite that typically contains high concentrations of arsenic (type A-jarosite). However, during pyrite oxidation, dissolution of the constituent Fe and S predominates, which is evidenced by corrosion of pyrite particles with formation of pits, generating a type of jarosite with high quantities of K (type B-jarosite). Lastly, a third type of jarosite (type C-jarosite) also precipitated forming a thin film that covered the grains of pyrite principally. (C) 2010 Elsevier B.V. All rights reserved. | |
| dc.language | eng | |
| dc.publisher | Elsevier B.V. | |
| dc.relation | Hydrometallurgy | |
| dc.rights | info:eu-repo/semantics/closedAccess | |
| dc.subject | A. ferrooxidans | |
| dc.subject | Arsenopyrite | |
| dc.subject | Bioleaching | |
| dc.subject | Jarosite | |
| dc.subject | Pseudomorphs | |
| dc.subject | Pyrite | |
| dc.title | Jarosite pseudomorph formation from arsenopyrite oxidation using Acidithiobacillus ferrooxidans | |
| dc.type | Otro | |
