scholarly journals Efficacy of Bacterial Adaptation on Copper Biodissolution from a Low Grade Chalcopyrite Ore by A. ferrooxidans

2012 ◽  
Vol 01 (01) ◽  
pp. 1-7 ◽  
Author(s):  
. Abhilash ◽  
K. D. Mehta ◽  
Bansi D. Pandey
Keyword(s):  
Low Grade ◽  
Bacterial Adaptation ◽  
Chalcopyrite Ore

Bioleaching of copper from a low-grade chalcopyrite ore

1981 ◽  
Vol 31 (1) ◽  
pp. 358-362 ◽  
Author(s):  
Desh Deepak ◽  
Kumudeswar Das
Keyword(s):  
Low Grade ◽  
Chalcopyrite Ore

scholarly journals Bacterial leaching kinetics for copper dissolution from a lowgrade Indian chalcopyrite ore

2013 ◽  
Vol 66 (2) ◽  
pp. 245-250 ◽  
Author(s):  
Abhilash ◽  
K.D. Mehta ◽  
B.D. Pandey
Keyword(s):  
Phase Identification ◽  
Low Grade ◽  
Bacterial Leaching ◽  
Copper Dissolution ◽  
Diffusion Controlled ◽  
Shrinking Core ◽  
Copper Mines ◽  
Chalcopyrite Ore ◽  
Best Fit

Bio-leaching of copper (0.3%) from a low grade Indian chalcopyrite ore of Malanjkhand copper mines, using a native mesophilic isolate predominantly Acidithiobacillus ferrooxidans (A.ferrooxidans), is reported. A bio-recovery of 72% Cu was recorded in the presence of this culture (not adapted), which increased to 75% with an ore adapted culture after 35 days at 35ºC and pH 2.0 with <50fim particles. The kinetic data showed best fit for the diffusion-controlled shrinking core model, exhibiting linear plots for [1- 2/3X-(1-X)2/3] vs time (X-fraction leached). Apparently, the role of the bacteria is to convert the ferrous ion to the ferric state, which oxidizes the chalcopyrite in order to dissolve copper, while maintaining a high redox potential. The activation energy value (E) was calculated to be 96 and 108 kJ/mol for the un-adapted culture and the ore adapted culture respectively in the temperature range 25-35ºC. This leaching mechanism was corroborated by XRD phase identification and SEM studies of the leach residue.

Optimization of staged bioleaching of low-grade chalcopyrite ore in the presence and absence of chloride in the irrigating lixiviant: ANFIS simulation

2016 ◽  
Vol 39 (7) ◽  
pp. 1081-1104 ◽  
Author(s):  
Ali Behrad Vakylabad ◽  
Mahin Schaffie ◽  
Ali Naseri ◽  
Mohammad Ranjbar ◽  
Zahra Manafi
Keyword(s):  
Low Grade ◽  
Presence And Absence ◽  
Chalcopyrite Ore

Bioleaching of Low-Grade Chalcopyrite Ore by the Thermophilic Archaean Acidianus brierleyi

2017 ◽  
Vol 262 ◽  
pp. 237-241 ◽  
Author(s):  
Norizoh Saitoh ◽  
Toshiyuki Nomura ◽  
Yasuhiro Konishi
Keyword(s):  
Environmentally Friendly ◽  
Copper Recovery ◽  
Copper Extraction ◽  
Low Grade ◽  
Column Reactor ◽  
Stirred Reactor ◽  
Acidianus Brierleyi ◽  
Environmentally Friendly Process ◽  
Chalcopyrite Ore

The thermophilic archaean, Acidianus brierleyi, was examined for its feasibility to bioleach copper from a low-grade chalcopyrite ore (1.15 % copper, 20.4 % iron and 2.63 wt% sulfur) at 65°C and pH 1.8-2.5. The chalcopyrite leaching was markedly accelerated in the presence of A. brierleyi, and an extremely high 80% leaching of copper in the low-grade ore (25-38 μm particles) was achieved in 14 days in a batch stirred reactor. By comparison, the leaching of iron was very slow and only a slight 5 % iron was leached in 14 days in the presence or absence of A. brierleyi. In other words, A. brierleyi selectively leached chalcopyrite while magnetite leaching by A. brierleyi was negligible. Moreover, bioleaching of the low-grade ore (53-75 μm particles) yielded 55% copper recovery after 20 days of operation in a column reactor. The good results for the copper bioleaching in the column reactor are very similar to those in the stirred reactor. These results lead to the conclusion that the thermophile bioleaching with A. brierleyi is attractive as an economical and environmentally friendly process for good copper extraction from low-grade chalcopyrite ore.

Respirometry studies of bioleaching of low-grade chalcopyrite ore using six acidophilic strains

2011 ◽  
Vol 24 (11) ◽  
pp. 1139-1145 ◽  
Author(s):  
Jian Song ◽  
Peter D. Franzmann ◽  
Jianqiang Lin ◽  
Jianqun Lin ◽  
Anna H. Kaksonen
Keyword(s):  
Low Grade ◽  
Chalcopyrite Ore

Spatial variations in leaching of a low-grade, low-porosity chalcopyrite ore identified using X-ray μCT

2017 ◽  
Vol 105 ◽  
pp. 63-68 ◽  
Author(s):  
Marijke A. Fagan-Endres ◽  
Johannes J. Cilliers ◽  
Andrew J. Sederman ◽  
Susan T.L. Harrison
Keyword(s):  
Spatial Variations ◽  
Low Grade ◽  
X Ray ◽  
Chalcopyrite Ore ◽  
Low Porosity

Recovery of copper values from bio-heap leaching of low grade Malanjkhand chalcopyrite ore

2009 ◽  
Vol 26 (6) ◽  
pp. 1668-1674 ◽  
Author(s):  
Lala Behari Sukla ◽  
Kailash Chandra Nathsarma ◽  
Joystna Rani Mahanta ◽  
Sradhanjali Singh ◽  
Snehasis Behera ◽  
...  
Keyword(s):  
Heap Leaching ◽  
Low Grade ◽  
Chalcopyrite Ore

Growth and activity of pure and mixed bioleaching strains on low grade chalcopyrite ore

2008 ◽  
Vol 21 (1) ◽  
pp. 93-99 ◽  
Author(s):  
J.J. Plumb ◽  
N.J. McSweeney ◽  
P.D. Franzmann
Keyword(s):  
Low Grade ◽  
Chalcopyrite Ore

scholarly journals Population Dynamics of a Low-Grade Chalcopyrite Bioleaching Column

2009 ◽  
Vol 71-73 ◽  
pp. 71-74 ◽  
Author(s):  
L.A. Mutch ◽  
Helen R. Watling ◽  
Elizabeth L.J. Watkin
Keyword(s):  
Population Dynamics ◽  
Restriction Fragment Length Polymorphism ◽  
Restriction Fragment ◽  
Length Polymorphism ◽  
Fragment Length ◽  
Fragment Length Polymorphism ◽  
Low Grade ◽  
Discernible Effect ◽  
Chalcopyrite Ore ◽  
Restriction Fragment Length

Terminal Restriction Fragment Length Polymorphism (T-RFLP) was used to determine the diversity of the bacterial and archaeal populations in a bioleaching column charged with a low-grade chalcopyrite ore and operated at 50 oC. Differing populations were identified in the leachate and the column solids but there was not discernible effect in respect of location in the column.

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