Paper Title:
Precipitation of Iron Oxyhydroxides and Basic Sulphates from Bioleach Liquors Generated by Thermophilic Micro-Organisms
  Abstract

Thermophilic micro-organisms are known to oxidise pyrite and other iron sulphide minerals resulting in the production of acidic ferric sulphate solutions. In this study, the leach liquors generated from such bacterial oxidation were aged through a forced hydrolysis process to yield various iron oxyhydroxides and sulphates. The forced hydrolysis was carried out under a pH range of 1.9 to 9.0. Upon completion of aging, the precipitates generated were characterised using powder X-Ray diffractrometry. The XRD analyses revealed a production of a variety of iron oxyhydroxides and basic iron sulphates. The nature of these precipitates was influenced by the pH conditions used during aging. Jarosite compounds were precipitated under acidic conditions, whilst aging under more basic conditions led to the precipitation of iron oxyhydroxides. These findings may find application in forecasting the phase boundary conditions for Fe(III) precipitation in biogeochemical processes and provide an insight into the tackling of problems associated with the treatment and management of acid mine drainage.

  Info
Periodical
Advanced Materials Research (Volumes 71-73)
Edited by
Edgardo R. Donati, Marisa R. Viera, Eduardo L. Tavani, María A. Giaveno, Teresa L. Lavalle, Patricia A. Chiacchiarini
Pages
453-456
DOI
10.4028/www.scientific.net/AMR.71-73.453
Citation
K.A. Mchibwa, S. Ndlovu, S. Iyuke, "Precipitation of Iron Oxyhydroxides and Basic Sulphates from Bioleach Liquors Generated by Thermophilic Micro-Organisms", Advanced Materials Research, Vols. 71-73, pp. 453-456, 2009
Online since
May 2009
Export
Price
$35.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Cecilia S. Demergasso
Abstract:The paper “Bacterial succession in bioheap leaching” [1] initiated the search for methods to analyze the microbial dynamics in bioleaching...
21
Authors: Jin Liu, Dong Wei Li, Shao Jian Zhang, Dou Li, Lin Yu
Sustainable Materials and Applications
Abstract:The bioleaching effect of different concentrations of silver ion catalysis on chalcopyrite tailings has been investigated in shaking flasks....
635
Authors: Su Rong Hu, Chao Wang, Qi Feng Wei
Chapter 15: Chemical Metallurgy and Mining Explorations
Abstract:An attempt has been made to study the pretreatment of sulfidic refractory gold ore with pyrolusite. The influences of various parameters were...
2891
Authors: A.N. Mikhailova, A.A. Faiberg, S.S. Gudkov, V.Ye. Dementev
Chapter 3: Technologies of Bioleaching in Hydrometallurgy
Abstract:Nowadays, efficient recovery of base metals from the solutions when processing gold ores is a topical issue. In this connection, the focus is...
477