Some aspects of pH effects and acid stress in heap bioleaching
Journal Article
2011
Permanent link to this Item
Authors
Journal Title
Minerals Engineering
Link to Journal
Journal ISSN
Volume Title
Publisher
Elsevier
Publisher
University of Cape Town
Series
Abstract
The chemical and physical conditions in sulphide heaps provide a complex environment for micro-organisms, with differences in redox potential, acidity, temperature, oxygen and solution chemistry conditions being experienced both temporally and spatially. One of the most important parameters for successful microbial colonisation and active microbial metabolism is suitable pH conditions in the heap. Typically heaps reach tens of metres high and the pH of irrigation solution travelling through heap changes significantly. In this study, we investigated the effect of pH and acid stress for moderately thermophilic and thermophilic mixed cultures, operating at 50–60 C in a heap bioleaching environment. Results collected from laboratory scale column reactors packed with the low grade whole ore and irrigated with different pH solutions during a temperature shift from moderately thermophilic conditions to thermophilic conditions are discussed.
Description
Reference:
Tupikina, O. V., Ngoma, I. E., Minnaar, S., & Harrison, S. T. L. (2011). Some aspects of the effect of pH and acid stress in heap bioleaching. Minerals Engineering, 24(11), 1209-1214.