Two acidophilic strains,i.e,Acidithiobacillus ferrooxidans and Thiobacillus thiooxidans,were used to extract copper from the powder of printed circuit board(PCB).The experiment was conducted using different single strains and mixed bacteria,compared with others showing,the leaching behavior of single Acidithiobacillus ferrooxidans was the best with …
The leaching of Li was enhanced with S becoming of . H. 2. ... (1998) reported two-step bio-leaching with A. ferrooxidans for spent Ni-Cd batteries. H. 2. SO. 4 . production from S oxidation ...
Microbial analysis of a 2X1000-tonne bio-heap leaching plant of Malanjkhand copper ore was done. Continuous monitoring of the micro-organism profile was done through conventional methods.
Bioleaching, as a bio-hydrometallurgy technique, applies microorganisms including fungi, chemolithotrophic and acidophilic bacteria (microbial metabolites) as leaching agents …
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1. Introduction. A commercial bio-heap leaching plant at Zijinshan copper mine with a capacity of 10,000 t/year copper cathode has been operating successfully since 2006. Ruan et al., 2006, Ruan et al., 2011 published reports on this distinct bio-heap leaching practice, detailing the aspects of mineralogy, heap stacking engineering, …
There are different processes for treating or extracting valuable minerals from those without economic value, such as leaching, defined as the "treatment of complex substances, …
Bio-leaching is a cost effective, efficient, safe, and. environmentally friendly way to treat refractory gold concentrates and ores. Compared. to roasting, bio-leaching can generally reduce ...
Spent medium leaching achieved a gold recovery of 36.4% as compared to 24.7% under two-step bioleaching for pretreated e-waste. References 1 S. Herat, Sustainable Management of Electronic Waste (e-Waste), Clean—Soil Air Water 2007, …
Bioleaching is a natural process involving acidophilic bacteria and archaea, which have the ability to either oxidize metal sulfides or to oxidize reduced inorganic sulfur …
3.3. Release of Elements during Leaching Experiments The behavior of Cr, Fe, Ni, Mn, and Al during the bioleaching of the fresh tailing sample is presented in Figures4–8and the units are expressed in mg of element released per kg of tailings. The use of A. thiooxidans as a leaching agent facilitates Fe dissolution.
Bio-leaching of manganese from electrolytic manganese slag by Microbacterium trichothecenolyticum Y1: Mechanism and characteristics of microbial metabolites. Author links open overlay panel Jirong Lan a b 1, Yan Sun a 1, Xiaohong Chen a, Wei Zhan a, Yaguang Du a, Tian C. Zhang c, Hengpeng Ye a, Dongyun Du a, Haobo …
In this paper the bio-leaching actions of L. fer- riphilum initially grown on different media on the mineral-solution interface are studied. The purpose is to show the change in pyrite surface properties caused by bacterial interaction and to elaborate the mecha- nism of pyrite bio-leaching to some extent. 2 Minerals and methods 2.1 …
The reductive dissolution of pyrolusite in simulated Acidithiobacillus ferrooxidans bio-leaching medium was investigated. This study was performed in three stages. First, the advantageous electrochemical test conditions, parallel to the optimal bio-leaching conditions and adopting the Mn reduction rate, were determined by imitated …
Bioleaching is a method of extracting minerals and metals from their parent ores using naturally occurring biological. processes. The practice requires none of the environmentally damaging ...
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Calama. Calama is considered the mining capital of Chile. It is located in the middle of the Atacama desert and is a strategic point to visit San Pedro de Atacama. Located in the region of Antofagasta, Calama is the capital of the province of Loa. Due to its closeness to several deposits and to Chiquicamata (the world's largest open pit mine ...
Generally heap leaching process is employed in copper leaching process but sometimes a combination of heap leaching and in situ leaching processes are used. The solution (Sulphate/Fe 3 solution) is sprinkled over the heap which percolates through the ore and collects at the bottom pit. The solution collecting in the bottom pit will include ...
Low-grade ores are treated by dump leaching, while vat leaching can be used to treat higher grade oxide ore. Agitation leaching in stirred tanks is applied to both oxide and sulfide materials: the ...
The (bio)chemical fundamentals of the leaching reactions have been the subject of intensive research in the last decades. In this context, the sulfur chemistry behind the leaching mechanisms has been widely understood (Schippers 2004; Vera et al. 2013a). The "indirect mechanism," i.e., the non-enzymatic metal sulfide oxidation by iron(III ...
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The reason of effective chalcopyrite leaching with the extremely thermophilic microorganisms can be that passivating sulfur layers which occur during the leaching are less stable at higher ...
The acid bio-leaching process of vanadium extraction from clay vanadium water-leached residue was studied and the effect of the performance of iron transformation was investigated. Acidithiobacillus ferrooxidans affects the dissolution of vanadium through the catalytic effect on Fe3+/Fe2+ couple and material exchange. The passivation of iron …
Producing amorphous calcium carbonate using waste Ca-rich solution generated through the bio-leaching of slag. Author links open overlay panel Yanhui Pei a, Peiyuan Chen a b, Shangkun Li a, Jialai Wang c. Show more. Add to Mendeley. ... To investigate the effect on Ca 2+ leaching rate in GGBFS under organic acid solution …
Bioleaching involves the use of microorganisms to catalyze the oxidation of iron sulfides to create ferric sulfate and sulfuric acid. Ferric sulfate, which is a powerful oxidizing agent, …
1. Introduction. In the Sudbury area, up to 100 millions metric tonnes of pyrrhotite (Fe 1-x S) tailings have been disposed, with an estimated average grade around ~0.8 wt% Ni (Peek et al., 2011).Considering the constant remediation required to prevent acid mine drainage caused by pyrrhotite oxidation, the potential for recovering the Ni …
Inoculating the bacterial community with ferric iron (Fe 3+) under shaking conditions resulted in rapid copper recovery from bornite, leaching 40% of the Cu content after 10 days of cultivation. The addition of ferrous iron (Fe 2+) instead promoted Cu recovery of 30% at day 48, clearly delaying the leaching process. More efficiently, the ...
Bioleaching, the microbially-mediated release of critical metals from ores, offers a route to more sustainable mining practices, especially for recalcitrant deposits ( Brierley, 2019 ).
Heap leaching takes months rather than years as for dump leaching. Compared with stirred tank reactors, heap reactors form undesired gradients of pH, temperature and reagent levels. ... Table 1 lists examples of acidophilic prokaryotes identified in stirred‐tank mineral bioleaching and bio‐oxidation operations. Table 1. …
The results from Table 4 suggest that the bio-leaching process does not result simply from the chemical leaching from the bio-acids secreted Fungal bioleachingof low grade laterite ores 201 by the fungus, but that the micro-organism appear to participate in the leaching process. The leaching behaviour of the various minerals appears to be ...
The influence of the environment and bacterial cultures on the degree of gold leaching from Au-containing raw materials of different compositions, origins, and with different contents of gold, selected in the Ural Federal District (Russia), was determined. The leaching degree was determined according to the change of the gold concentration …
