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Browsing by Author "Hansford, G S"

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Biological oxidation of ferrous sulphate by Thiobacillus ferroxidans: a review on the kinetic aspects

Author: Nemati, M ; Harrison, S T L ; Hansford, G S ; Webb, C Date: 1998 Biological oxidation of ferrous sulphate by Thiobacillus ferrooxidans has proved to be a significant step in the bioleaching of sulphide minerals and treatment of acid mine drainage. The same bioreaction also has beneficial applications in ... Read more
Biooxidation kinetics of Leptospirillum ferriphilum under heap bioleach conditions

Author: Ojumu, T V ; Harrison, S T L ; Hansford, G S ; Petersen, J Date: 2008 Although the kinetics of biological oxidation of ferrous to ferric iron–the key step in any bioleaching process–have been studied for a variety of organisms, the focus has always been on conditions typical of tank-bioleaching. In heaps, ... Read more
The effect of As(III) and As(V) on the batch bioleaching of a pyrite-arsenopyrite concentrate

Author: Breed, A W ; Glatz, A ; Hansford, G S ; Harrison, S T L Date: 1996 The bioleaching of arsenical gold-bearing sulphide ores and concentrates solubilises iron, arsenic and sulphur. Previous work has shown that high concentrations of iron and arsenic in solution inhibit bacterial growth, with As(III) reported ... Read more c b n d
The kinetics of ferrous-iron oxidation by Leptospirillum ferriphilum in continuous culture: the effect of temperature

Author: Ojumu, T V ; Hansford, G S ; Petersen, J Date: 2009 A typical bioleach heap is characterized by wide variation of temperature across the heap bed, leading to oxidation of target minerals occurring at different rates. Previous studies on the effect of temperature on the microbial oxidation of ... Read more
A review of rate equations proposed for microbial ferrous-iron oxidation with a view to application to heap bioleaching

Author: Ojumu, T V ; Petersen, J ; Searby, G E ; Hansford, G S Date: 2006 In view of the fact that the microbial oxidation of ferrous iron to the ferric form is an essential sub-process in the bioleaching of sulphide minerals, the development of a comprehensive rate equation for this sub-process is critical. Such ... Read more
The kinetics of the bioleaching of a refractory gold-bearing pyrite concentrate

Author: Drossou, Marianna Date: 1986 Read more