Bacterial leaching of low-grade ZnS concentrate using indigenous mesophilic and thermophilic strains

2007 ◽  
Vol 85 (1) ◽  
pp. 59-65 ◽  
Author(s):  
S.M. Mousavi ◽  
S. Yaghmaei ◽  
M. Vossoughi ◽  
A. Jafari ◽  
R. Roostaazad ◽  
...  
Keyword(s):  
Low Grade ◽  
Bacterial Leaching

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.

Utilisation of low-grade pyrites through bacterial leaching

1989 ◽  
Vol 26 (3-4) ◽  
pp. 275-284 ◽  
Author(s):  
G. Roy Chaudhury ◽  
L.B. Sukla ◽  
R.P. Das
Keyword(s):  
Low Grade ◽  
Bacterial Leaching

scholarly journals Hydrometallurgical Processing of Low-Grade Sulfide Ore and Mine Waste in the Arctic Regions: Perspectives and Challenges

Minerals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 436 ◽  
Author(s):  
Vladimir Masloboev ◽  
Sergey Seleznev ◽  
Anton Svetlov ◽  
Dmitriy Makarov
Keyword(s):  
Mine Waste ◽  
Heap Leaching ◽  
Climatic Conditions ◽  
The Arctic ◽  
Low Grade ◽  
Bacterial Leaching ◽  
Processing Technologies ◽  
Hydrometallurgical Processing ◽  
Waste Dumps ◽  
Nickel Ores

The authors describe the opportunities of low-grade sulfide ores and mine waste processing with heap and bacterial leaching methods. By the example of gold and silver ores, we analyzed specific issues and processing technologies for heap leaching intensification in severe climatic conditions. The paper presents perspectives for heap leaching of sulfide and mixed ores from the Udokan (Russia) and Talvivaara (Finland) deposits, as well as technogenic waste dumps, namely, the Allarechensky Deposit Dumps (Russia). The paper also shows the laboratory results of non-ferrous metals leaching from low-grade copper-nickel ores of the Monchepluton area, and from tailings of JSC Kola Mining and Metallurgical Company.

Modeling and optimizing bacterial leaching process parameters to increase copper extraction from a low-grade ore

2012 ◽  
Vol 32 ◽  
pp. 5-7 ◽  
Author(s):  
M. Yaghobi Moghaddam ◽  
M. Ranjbar ◽  
Z. Manafi ◽  
M. Schaffie ◽  
M. Jahani
Keyword(s):  
Process Parameters ◽  
Copper Extraction ◽  
Low Grade ◽  
Bacterial Leaching ◽  
Leaching Process

Microbial Succession during a Heap Bioleaching Cycle of Low Grade Copper Sulphides. Does this Knowledge Mean a Real Input for Industrial Process Design and Control?

2009 ◽  
Vol 71-73 ◽  
pp. 21-27 ◽  
Author(s):  
Cecilia Demergasso
Keyword(s):  
Monitoring Program ◽  
Industrial Process ◽  
Molecular Techniques ◽  
Low Grade ◽  
Reduced Sulfur Compounds ◽  
Microbial Succession ◽  
Bacterial Leaching ◽  
Physical Conditions ◽  
Bacterial Succession ◽  
The Impact

The paper “Bacterial succession in bioheap leaching” [1] initiated the search for methods to analyze the microbial dynamics in bioleaching industrial processes as a key to advancing commercial bioheap applications. “Chemical and physical conditions within bioheaps change radically from the time the bioheap is stacked and inoculated until bioleaching is completed.” The results from a comprehensive monitoring program by culturing and molecular techniques in an industrial bioleaching process for Run-of-mine (ROM) low grade copper sulfide ore in Chile will be summarized. The analysis of the compiled information permits an understanding of changes in microbial substrates availability, chemical and physical conditions. The impact of other aspects on microbiology, such as the mining programme and the industrial design are also considered. The bacterial succession in bioheap leaching solutions allowed the leaching cycle stages to be describe as: i) Acid conditioning and soluble copper releasing, ii) Chalcocite Bacterial leaching (ferrous oxidation); iii) Chalcocite Bacterial leaching (ferrous and reduced sulfur compounds –RSC- oxidation); iv) Bacterial leaching of sulphide minerals with higher rest potentials (pyrite and covellite ), v) Bacterial oxidation of remnant sulfide minerals and RSC.

Application Potential of Biohydrometallurgy in the Iranian Mining Industry

2007 ◽  
Vol 20-21 ◽  
pp. 38-41 ◽  
Author(s):  
M. Ranjbar ◽  
M. Schaffie ◽  
Mohammad Pazouki ◽  
R. Ghazi ◽  
A. Akbary ◽  
...  
Keyword(s):  
Mining Industry ◽  
Copper Recovery ◽  
Commercial Application ◽  
Copper Extraction ◽  
Low Grade ◽  
High Grade ◽  
Bacterial Leaching ◽  
Application Potential ◽  
Commercial Applications ◽  
Essential Growth

Several studies and different successful commercial applications had demonstrated that bioleaching can be an innovative approach that is capable to provide mining industry opportunities for essential growth in the medium term[2-18]. To identify the commercial application potential of bioleaching in Iranian copper industry, a research program was initiated. The objective of the main part of this program was to evaluate bacterial leaching processes for copper recovery from (i) high grade ores and flotation concentrates and (ii) low grade ores and flotation tailings. The latest results of these studies indicates the general operability of the bioleaching in both cases. At optimum conditions, the copper extraction from low grade materials was more than 80% and that from high grade ores and flotation concentrates about 95%, which should be high enough to justify the process economically.

scholarly journals PERCOLATION BACTERIAL LEACHING OF LOW-GRADE COPPER ORE

2018 ◽  
Vol 306 (3) ◽  
pp. 30-37
Author(s):  
Nariman Zhappar ◽  
◽  
Oleg Ten ◽  
Darkhan Balpanov ◽  
Rakhmetulla Erkasov ◽  
...  
Keyword(s):  
Low Grade ◽  
Bacterial Leaching ◽  
Copper Ore

Bacterial Leaching of Heavy Metals From Anaerobically Digested Sewage Sludge

1983 ◽  
Vol 18 (1) ◽  
pp. 151-162 ◽  
Author(s):  
L. Wong ◽  
J.G. Henry
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Agricultural Land ◽  
Metal Removal ◽  
Health Hazard ◽  
Dry Weight ◽  
Low Grade ◽  
Bacterial Leaching ◽  
Beneficial Reuse ◽  
Digested Sewage Sludge

Abstract Spreading of sewage sludges on agricultural land is an attractive sludge management option because it combines beneficial reuse and disposal at the same time. However, it is important to reduce the metal content in the sludge in order to minimize the health hazard associated with metal uptake by plants and its subsequent accumulation in the food chain. Treatment of sludge with acid for metal removal is not practical because a large amount of acid is required. Typically 0.5 to 0.8 g of H2SO4/g dry weight of sludge will be required to achieve over 70% removal of cadmium (Cd), zinc (Zn) and nickel (Ni). Lead (Pb) and copper (Cu) are not significantly removed. A biological process called bacterial leaching, which has been used commercially for extracting copper and uranium from low grade ores, was reviewed and its potential for removing heavy metals from anaerobically digested sewage sludge was investigated. Leaching experiments were conducted and the results showed that about 80 to 90% removal of cadmium, zinc and nickel, and 60 to 70% removal of copper were possible. The acid requirement was significantly reduced because only 0.15 g of H2SO4/g dry weight of sludge was needed.

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