Bioleaching
Browse 60 curated documents about bioleaching in The Archive — the 2RA-Edition digital library for engineering and scientific research. This collection of books, journal articles, theses, reports, and technical documents on bioleaching spans extractive metallurgy, mining engineering, chemistry, and applied science. Every document is searchable in full text; sign in to read, download, ask AI questions about any document, or generate cited research drafts with the AI Researcher.
DIRECT BIOLEACHING OF ZINC USING manihot
Ajibola, O. O., Adebayo, A. O.
The advent and development of new technologies that will provide better yields, cleaner, and a safer environment is a global challenge for researchers. Traditional solvents used in the extraction of minerals are often hazardous, posing ecological threats. This study reports the direct bioleaching of zinc sourced from the Abakaliki-Ishiagwu complex zinc sulphide ore deposit, which predominantly con
2019 Ghadiri Micro CT investigation of heap bioleaching variables
Mahdi Ghadiri
Heap bioleaching is a hydrometallurgical technology used to facilitate the extraction of valuable metals such as copper, gold, nickel, and uranium from low-grade, typically sulphidic, ores. This process is highly complex and is influenced by interactions of various sub-processes, including the flow of leaching solution around ore particles, mass and heat transfer within and around the particles, c
Investigating variables affecting heap (bio)leaching through determining access to sub-surface mineral grains by micro-scale X-ray tomography
Mahdi Ghadiri
Heap bioleaching is a hydrometallurgical technology used to facilitate the extraction of valuable metals such as copper, gold, nickel, and uranium from low-grade, typically sulphidic, ores. This process is highly complex due to the interactions of various sub-processes, including the flow of leaching solution around ore particles, mass and heat transfer, chemical reactions, and microbially-mediate
Unveiling the Bioleaching Versatility of Acidithiobacillus ferrooxidans
Luca Tonietti, Mattia Esposito
This study explores the bioleaching capabilities of Acidithiobacillus ferrooxidans, a bacterium known for its role in biohydrometallurgy. The objective was to investigate its versatility in metal recovery from various substrates. Utilizing a series of experimental setups, isolated strains of Acidithiobacillus ferrooxidans were subjected to different environmental conditions to assess their efficie
Advances in bioleaching of waste lithium batteries under metal ion stress
Xu Zhang, Hongjie Shi
In modern societies, the accumulation of vast amounts of waste Li-ion batteries (WLIBs) is a grave concern. Bioleaching has great potential for the economic recovery of valuable metals from various electronic wastes and has been successfully applied in mining on commercial scales. This review summarizes the advances in bioleaching of WLIBs, focusing on the effects of high concentrations of heavy m
Biosorption and Bioleaching of Heavy Metals from Electronic Waste Varied with Microbial Genera
Preetiman Kaur, Shivani Sharma
Industrialization and technological advancements have led to the exploitation of natural resources and the production of hazardous wastes, including electronic waste (E-waste). The traditional physical and chemical techniques used to combat E-waste accumulation have inherent drawbacks, such as the production of harmful gases and toxic by-products. These limitations may be prudently addressed by em
Bioleaching Techniques for Sustainable Recovery of Metals from Solid Matrices
Leidy Rendón-Castrillón, Margarita Ramírez-Carmona
This review paper explores the potential of bioleaching as a sustainable alternative for recovering metals from solid matrices. With over 12 billion tons of solid waste annually worldwide, bioleaching provides a promising opportunity to extract metals from solid waste, avoiding harmful chemical processes. It explains bacterial and fungal bioleaching techniques that extract copper, gold, zinc, and
Progress in bioleaching and its mechanism: a short review
Jyotilagna Dash, Ritesh Ojha
Bioleaching is an environmentally friendly and cost-effective technique for extracting metals from low-grade ores and waste materials. It uses microorganisms to dissolve metals through acidolysis, complexolysis, and redoxolysis, either directly or indirectly. While small-scale studies are conducted in shake flasks, larger applications include heap, vat, and tank systems. Bioleaching is promising f
The Influence of Various Ions in the Bioleaching of Metal Sulphides
A. BALLESTER, F. GONZALEZ
This study investigates the catalytic effect of various metallic ions, specifically Hg2+, Co2+, Ag+, Bi3+, and Cu2+, on the bioleaching of sphalerite and complex sulphide concentrates. Utilizing bacteria of the type Thiobacillus ferrooxidans that have been adapted to process sulphide concentrates, it was found that the presence of these cations significantly enhances the dissolution of copper from
The Bioleaching of Different Sulfide Concentrates Using Thermophilic Bacteria
F. TORRES, M.L. BL./~ZQUEZ
The bioleaching of different mineral sulfide concentrates with thermophilic bacteria (genus Sulfolobus) was studied to determine optimal conditions for metal recovery. The research focused on the influence of stirring methods and pulp density on dissolution rates. Findings revealed that pneumatic stirring was more effective at lower pulp densities, while orbital stirring yielded better results at
Study effects of conventional flotation reagents on bioleaching of zinc sulfide
M. Jafari, S. Chehreh Chelgani
Although flotation and bio-extraction of metals from its products are extensively investigated, few studies have evaluated the effects of reagents on the bioleaching process. Both the structure and concentration of flotation reagents significantly affect microorganism activities. This study utilized Kendall’s tau (t) as a statistical method to assess the impact of typical sulfide flotation surfact
Selective Cyclic Bioleaching of a Copper-Zinc Sulphide Concentrate
F. CARRANZA, M.J. GARCIA
The separation of the chemical and biological stages for enhanced kinetics by delegating the role of the bacteria to regenerating the leachant for selective dissolution of zinc from a copper-zinc sulphide concentrate was investigated. The process involves the use of an acidic ferric sulphate solution as a leaching agent which is continually regenerated by fixed populations of Thiobacillus ferrooxi
Parameters for Control and Optimization of Bioleaching of Sulfide Minerals
H. Deveci, A. Akcil
Bioleaching/biooxidation involves the dissolution of metals from sulfide minerals through the action of acidophilic bacteria, which are crucial in accelerating this process. This study aims to identify and control various operating parameters that influence the efficiency of bioleaching processes. Key parameters include temperature, acidity, oxidizing conditions, nutrient availability, as well as
DIRECT BIOLEACHING OF ZINC USING manihot esculenta crantz (cassava) EXTRACT WITHOUT ADDITIVES
Ajibola, O. O., Adebayo, A. O.
The advent and development of new technologies that will provide better yields, cleaner, and a safer environment is a global challenge for researchers. This study reports the direct bioleaching of zinc sourced from Abakaliki-Ishiagwu complex zinc sulphide ore deposit, primarily consisting of sphalerite ore. The extraction process includes mineral comminution, froth flotation, and roasting. Agro-cy
Copper, zinc, and iron bioleaching from polymetallic sulphide concentrate
Vesna T. CONIĆ, Mirjana M. RAJČIĆ VUJASINOVIĆ
Bioleaching of low-grade complex Cu−Zn−Pb−Fe−Ag−Au sulphide concentrate (of Majdanpek ore body, RTB Bor, Serbia) was carried out in an aerated bioleach reactor in the presence of mesophilic mixed bacterial culture of Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans, and Leptospirillum ferrooxidans. A mesophilic acidophiles culture was isolated from the acidic solution of the undergrou
Conjoint bioleaching and zinc recovery from an iron oxide mineral residue by a continuous electrodialysis system
Adam J. Williamson, Karel Folens
Many metal refining processes generate low-grade mineral residues that are typically stored on landfills and responsible for inefficient land-use. While being of environmental concern, residual metals contained in these wastes can become an interesting secondary resource. A novel bio-hydrometallurgical route for recovery of Zn from such waste residues to a highly pure resource is proposed. The use
Bioleaching of zinc and nickel from sili
I.M. Castro, J.L.R. Fietto
In this work, we investigated the role of bacteria from the genera Bacillus and Pseudomonas and fungi from the genera Aspergillus and Penicillium in the leaching process of two different silicates, calamine and garnierite. Since the results obtained with A. niger were better than those with different bacteria, a more detailed investigation of the leaching process with this microorganism was conduc
Bioleaching of pollymetallic sulphide co
Milovan Vuković, Nada Štrbac
An extreme thermophilic, iron-sulphur oxidising bacterial culture was isolated and adapted to tolerate high metal and solids concentrations at 70 °C. Following isolation and adaptation, the culture was used in a batch bioleach test employing a 5-l glass standard magnetic agitated and aerated reactor for the bioleaching of a copper-lead-zinc collective concentrate. The culture exhibited stable leac
Bioleaching of Metals from Wastes of Pho
Akmaral U. Issayeva, Radosław Pankiewicz
Phosphorus-containing wastes formed after the production of phosphorus fertilizers in Shymkent, due to intensive urbanization were within the city limits and for reason of processes of water-wind erosion began to pose a serious threat to the environment and the population of the city. It was found that the formation of the fractional composition of wastes was influenced by the conditions of proces
Bioleaching of high grade Pb Zn ore by m
Moazur Rehman, Munir Ahmad Anwar
The purpose of this study was to test the feasibility of using iron and sulphur oxidizing bacteria for the acid leaching of a high grade Pb–Zn ore material. Three strains (ATCC 13661, NCIMB 13537 and C2-TF) of Acidithiobacillus ferrooxidans and two strains (MT-TH1 and MT-13) of Sulfobacillus thermosulfooxidans were tested in this study. The bioleaching was monitored by measuring the dissolved meta
Bioleaching of complex zinc sulphides us
H. Deveci, A. Akcil
This study investigates the bioleaching of complex Pb/Zn ore/concentrate using mesophilic (at 30°C), moderate (at 50°C), and extreme thermophilic (at 70°C) strains of acidophilic bacteria. The effects of bacterial strain, pH, iron precipitation, and external addition of Fe2+ on the extraction of zinc were evaluated. The results have shown that the ore is readily amenable to the selective extractio
Bioleaching An Important Approach for Me
D. M. Musa, U. O. Ujih
Bioleaching is a new method of refining minerals from their parent ores in order to obtain the required metal using naturally occurring microorganisms. These microbes are naturally attached to the mineral ores; they used inorganic carbon as their source of carbon and flourished in a low pH environment, usually activated and cultured in irrigated heap and stirred tank reactors. The environment with
Bacterial leaching of low grade ZnS conc
S.M. Mousavi, S. Yaghmai
In this study, low-grade sphalerite has been treated by the bioleaching process using native cultures of Acidithiobacillus ferrooxidans and Sulfobacillus thermosulfido-oxidans in order to determine the ability of these bacteria to leach zinc. The effects of bacterial strain, pH, temperature, pulp density, iron precipitation, and initial concentration of ferric iron on zinc leaching were evaluated.
Investigation of the optimal technology
Vesna Conić, Srđan Stanković
This work aimed to investigate the optimal leaching technology for copper extraction from old flotation tailings of the Copper Mine Bor. The research involved multiple leaching experiments utilizing different methods, including leaching with sulphuric acid at 80 °C, which achieved a copper leaching degree of 50% after 30 minutes. Additionally, experiments were conducted using adapted moderately th
BIOLEACHING OF Zn Pb Ag SULPHIDIC CONCEN
Vesna T. Conic, Vladimir B. Cvetkovski
Polymetallic or complex Zn-Pb-Ag sulphide concentrates can be treated by bioleaching combined with proper hydrometallurgical processes. The objective of this study was to explore the efficacy of indirect bioleaching as a biotechnology for bioprocessing zinc and polymetallic concentrates. Utilizing a methodology based on ferric leaching facilitated by bio-regenerated ferric sulphate solution, the s
Bioleaching of Gold from Silicate Ore by Macrococcus caseolyticus and Acinetobacter calcoaceticus: Effect of Medium, Amino Acids and Growth Supernatant
Kanjana Kudpeng, Parinda Thayanukul
The aims of this work were to study the gold leaching by the isolated bacteria from silicate ore. Three strains were isolated and identified as Macrococcus caseolyticus, Acinetobacter calcoaceticus, and Bacillus sp. MBEA40. However, only M. caseolyticus and A. calcoaceticus were capable of gold bioleaching. In order to examine only the effect of microorganisms involved in the gold bioleaching proc
Interactions of phosphate solubilising microorganisms with natural rare-earth phosphate minerals: a study utilizing Western Australian monazite
Melissa K. Corbett, Jacques J. Eksteen
Many microbial species are capable of solubilising insoluble forms of phosphate and are used in agriculture to improve plant growth. In this study, we apply the use of known phosphate solubilising microbes (PSM) to the release of rare-earth elements (REE) from the rare-earth phosphate mineral, monazite. Two significant aspects are explored: the interaction of PSM with monazite and the resultant bi
Percolation Leaching: The status globally and in Southern Africa 2011
D W Dew, G F Rautenbach
This study reviews the global status of percolation leaching, focusing specifically on developments in Southern Africa. The primary objective is to elucidate the mechanisms by which microbial populations facilitate the heap bioleaching of sulfide minerals under elevated temperatures, utilizing iron(III) as the primary oxidant generated through the oxidation of iron(II). Methodologically, the paper
Study of Ni And Cd Bioleaching from Spen
OKSANA VELGOSOVÁ, JANA KADUKOVÁ
In the present work the Ni and Cd extraction from the electrode material of spent Ni-Cd batteries by bioleaching using the bacteria Acidithiobacillus ferrooxidans was examined. The possibility of the use of the bacteria for both the Ni and Cd recovery was analyzed. The anode of Ni-Cd batteries contains Ni0, Ni(OH)2, Cd0 and Cd(OH)2. The cathode is covered by nickel hydroxides and nickel oxy-hydrox
Influence of selected parameters on nick
Cerruti, C., Curutchet, G.
Unprocessed discarded nickel-cadmium batteries pose significant environmental hazards due to their heavy metal content. This study aims to explore effective methods for nickel and cadmium recovery from these spent batteries, focusing on bioleaching processes as a sustainable alternative to traditional techniques. A comprehensive review of existing literature was conducted to evaluate various biole
A Review on Various Aspects of Jarosite and Its Utilization Potentials
Nasim Eftekhari, Mohammad Kargar
Jarosite is an effective scavenger for metals represented by the chemical formula AFe3(SO4)2(OH)6. This article presents a comprehensive literature review concerning the formation, decomposition, and potential applications of jarosite. Through the analyzed literature, it was found that utilizing biological jarosite seeds can significantly shorten the induction period and lower the temperature thre
Biologically Fe2+ oxidizing fluidized bed reactor performance and controlling of Fe3+ recycle during heap bioleaching: an artificial neural network-based model
Bestamin Ozkaya, Erkan Sahinkaya
The performance of a biological Fe2+ oxidizing fluidized bed reactor (FBR) was modeled by a popular neural network-back-propagation algorithm over a period of 220 days at 37°C under different operational conditions. A method is proposed for modeling Fe3+ production in FBR and thereby managing the regeneration of Fe3+ for heap leaching application, based on an artificial neural network-back-propaga
Characterization of jarosites produced by chemical synthesis over a temperature gradient from 2 to 40 °C
Jerry M. Bigham, F. Sandy Jones
The purpose of the study was to characterize ferric iron precipitates formed in batch experiments over a temperature range of 2 to 40 °C from ferric sulfate and mineral salts in sulfuric acid. With the exception of elevated levels of K+ to promote jarosite [KFe3(SO4)2(OH)6] formation, the solution composition was intended to simulate fully oxidized bioleaching solutions. Iron-oxidizing acidophilic
Kinetics improvement of high-grade bioleaching by effects separation sulphides
F. Carranza, N. Iglesias
The kinetics of bioleaching of sulphide concentrates by Thiobacillus ferrooxidans can be improved by performing separately the two operations related to the indirect contact mechanism, namely chemical leaching and biological oxidation of the Fe2+ produced in the chemical stage (IBES: Indirect Bioleaching with Effects Separation). This approach allows for the individual enhancement of each stage, w
Implementation and practice of an integrated process to recover copper from low grade ore at Zijinshan mine
Jinghe Chen, Xian Jian Guo
It is a challenge to recover copper from low grade ore in an environmentally sustainable way, especially from low-grade copper sulfide resources. This paper introduces Zijinshan Mine where an integrated process was developed and applied to recover copper from low-grade copper sulfide ore and acid mine drainage (AMD). The process includes the main operations of milling-flotation, heap bioleaching,
Closed Loop Recycling of Copper from Was
Mahsa Baniasadi, John E. Graves
In the present study, a model of closed-loop recycling of copper from PCBs is demonstrated, which involves the sequential application of bioleaching and electrowinning to selectively extract copper. This approach is proposed as part of the solution to resolve the challenging ever-increasing accumulation of electronic waste, e-waste, in the environment. This work is targeting copper, the most abund
A novel eco friendly hybrid approach for
Rachna Sinha, Garima Chauhan
Amid the plethora of initiatives and regulations targeting the minimization of electronic waste generation and its transboundary shipment, efforts to adopt a sustainable resource conservation from this emerging waste stream are considerably missing. Present study is a pioneer effort to develop a novel two-stage biorecovery process followed by electrochemical treatment to recover copper in its reus
Bacterial Leaching as a Pre Treatment St (1)
Alper ÖZKAN, Salih AYDOGAN
This article discusses the use of bio-leaching as a pre-treatment step before cyanidation to improve gold recovery from refractory ores containing pyrite and arsenopyrite. Given the significant challenges posed by the encapsulation of precious metals in sulfide matrices, the objective is to explore alternative techniques for their extraction. The methodology includes a review of two bacterial leac
A novel energy efficient process for the
J.J. Eksteen, J.M. Mwase
The extraction of platinum group metals (PGMs) from low-grade concentrates poses significant challenges due to their refractory nature and the drawbacks associated with traditional extraction methods. This paper investigates a novel energy-efficient sequential stage heap leach process that incorporates heap bioleaching and high-temperature cyanide leaching to enhance extraction efficiencies. The p
Use of some isolated fungi in biological Leaching of Aluminum from low grade bauxite
Y. Ghorbani, M. Oliazadeh
In this investigation, the biological leaching of aluminum by isolated fungi from low grade bauxite (<50% Al2O3) was studied. The objective was to evaluate the efficiency of indigenous fungal species in solubilizing aluminum. Methodology involved biological leaching tests using Aspergillus niger and Penicillium notatum on Savored dextrose chloramphenicol agar as the medium, conducted in 250-ml Erl
Use of some isolated fungi in biological Leaching of Aluminum from low grade bauxite
Y. Ghorbani, M. Oliazadeh
This study investigates the biological leaching of aluminum from low grade bauxite using isolated fungi. The objective was to assess the efficacy of indigenous fungal species, specifically Aspergillus niger and Penicillium notatum, in leaching aluminum from bauxite with less than 50% Al2O3 content. Methodology involved carrying out biological leaching tests in controlled conditions using a medium
Leaching of Low-Grade Nickel Ores by Fungi Metabolic Acids
Jessica Tang, Marjorie Valix
This study was designed to investigate the nature of nickel and cobalt dissolution from limonite and weathered saprolite ores. Chemical leaching was conducted using 1 to 3M of citric, lactic and malic acids. These tests aimed to mimic metal dissolution achieved using heterotrophic or fungi organisms and their corresponding metabolic products. The results in this study was able to demonstrate the e
Bioleaching of Heavy Metals from Mine Tailings by Aspergillus fumigatus
Bahi Jalili Seh-Bardan, Radziah Othman
The bioleaching experiment was conducted for the removal of heavy metals from mine tailings. A fungal strain was isolated from the gold mine tailings and it has been identified as Aspergillus fumigatus based on its 18S rDNA analysis. Bioleaching using A. fumigatus was carried out in bioleaching step processes (one-step and two-step) at various tailings concentrations to determine the efficiency of
Bioleaching of heavy metals from a low-grade mining ore using Aspergillus niger
Catherine N. Mulligan, Mahtab Kamali
The main concern of this study is to develop a feasible and economical technique to microbially recover metals from oxide low-grade ores. Owing to the significant quantities of metals that are embodied in low-grade ores and mining residues, these are potential viable sources of metals. Additionally, they potentially endanger the environment, as the metals they contain may be released in hazardous
USING APLICATIVE SOFTWARE AND SOFTWARE TOOLS FOR THE PERFORMANCE OF LEACHING AND BIO-LEACHING
B.Krstev, A. Krstev
The refractory or low grade lead/zinc domestic ores in the Republic of Macedonia are investigated using conventional separation technology and flotation separation, while simultaneously exploring new possibilities for leaching through microbial processes known as bioleaching. This paper presents the results stemming from these varied methods and investigations focused on ore recovery. Employing th
The Influence of the Lead-Zinc Slags Fractional Composition and the Type of Microorganisms for the Processes of Metals Bioleaching
Akmaral U. Issayeva, Alisa I. Zhumadullayeva
Shymkent is one of the largest industrial cities of Kazakhstan with a lot of industrial wastes. These include lead-zinc slag, which has a strong anthropogenic stress on the environment. On the other hand, there is a large number of components concentrated in the waste. The possibility of using different groups of microorganisms for the recovery of valuable metals from a variety fraction of lead-zi
Ecological condition and microflora of Shymkent lead-zinc waste
Akmaral Issayeva, Assel Tleukeeva
This study investigates the ecological condition and microflora associated with lead-zinc waste in Shymkent, Kazakhstan, aimed at assessing the feasibility of bioleaching. The methodology involved microbiological studies to identify the microflora present in the lead-zinc waste, revealing the presence of species such as Thiobacillus ferrooxidans, Leptospirillum ferrooxidans, Nitrosomonas sp., Aspe
Bioleaching of Mining Waste of Hindustan Zinc Limited, Udaipur
Rashmi Mishra
The research work presented in this paper is on a biotechnological investigation for the recovery of zinc from mining waste, specifically low-grade ore. Leaching studies were carried out at different pH levels using a mixed culture grown from mine water. The findings revealed that recovery of zinc in the control set (without culture) was 8% in 37 days, while utilizing the culture of leaching bacte
Bioleaching of copper from old flotation tailings samples (copper mine Bor, Serbia)
Srđan Stanković, Ivana Morić
This study investigates the bioleaching of copper from old flotation tailings at the Copper Mine Bor using acidic water from Lake Robule as a lixiviant. Samples were collected from depths of 10, 15, and 20 meters, and subjected to bioleaching experiments conducted in shaken flasks over a period of five weeks. Results indicated a copper yield of 68.34±1.21% from the 15 m sample, 72.57±0.57% from th
Bioshale FP6 European project: Exploiting black shale ores using biotechnologies?
P. d’Hugues, P.R. Norris
Bioshale is a project co-funded by the European Commission (FP6 programme) that started in October 2004. The main objective of the Bioshale project is to define innovative biotechnological processes for ‘environmentally-aware’ exploitation of black shale ores. Three black shale deposits have been chosen as targets of the R&D actions. These include one deposit that exists under natural conditions (
Bioshale FP6 European project: Exploiting black shale ores using biotechnologies?
P. d’Hugues, P.R. Norris
The Bioshale project, co-funded by the European Commission under the FP6 program, commenced in October 2004 with the primary objective of developing innovative biotechnological processes for the environmentally conscious exploitation of black shale ores. The project focuses on three key black shale deposits, which include a natural deposit in Talvivaara, Finland, a currently processed deposit in L
Ferredox: A biohydrometallurgical processing concept for limonitic nickel laterites
Chris A. du Plessis, Wickus Slabbert
The Ferredox process is a biohydrometallurgical concept targeting tropical limonitic laterites, focusing on simplified and low-intensity processing while being amenable to modularization. This approach aims to reduce both technical implementation risks and capital costs for tropical limonite projects. Key to the Ferredox process is the reductive dissolution of goethite, the predominant nickel limo
Mesophilic leaching of copper sulphide sludge
VLADIMIR B. CVETKOVSKI, VESNA T. CONIĆ
This study investigates the precipitation of copper from an acid solution using sodium sulphide as a precipitation agent. The solution contained 17 g/l copper and 350 g/l sulfuric acid. Optical microscopy revealed a particle size of nearly 1 µm in the sulphide sludge sample, while chemical and X-ray diffraction analyses indicated covellite as the main sulphide mineral. A batch bioleach amenability
LEACHING OF NICKEL LATERITE USING FUNGUS MEDIATED ORGANIC ACID AND SYNTHETIC ORGANIC ACID: A COMPARATIVE STUDY
S.K. Behera, L.B. Sukla
A huge amount of overburden (nearly 8 to 10 times of the ore) containing trace amounts of nickel and cobalt is generated during Chromite mining at Sukinda valley, Orissa. This study aimed to extract these metals using multi metal resistant indigenous microorganisms, particularly a native strain of Aspergillus species known for their ability to produce organic acids, alongside synthetic organic aci
PRINCIPLES, MECHANISMS AND DYNAMICS OF CHALCOCITE HEAP BIOLEACHING
Jochen Petersen, David G. Dixon
Heap leaching is a well-established mining technology that involves stacking crushed ore into piles situated on an impermeable layer equipped with a drainage system. This study examines the principles, mechanisms, and dynamics of chalcocite heap bioleaching. The objective is to provide a detailed overview of the process, particularly focusing on the bioleaching of copper oxide minerals utilizing m
Heap leaching kinetics are proportional to the irrigation rate divided by heap height
H.M. Lizama, J.R. Harlamovs
Zinc sulphide ore was leached in columns of various heights and under various irrigation rates. This study aimed to investigate the relationship between heap leaching kinetics and irrigation rates in bioleaching processes. Experimental columns were constructed with heights ranging from 1 m to 8 m and were irrigated at different rates. The findings indicated that sphalerite and pyrite bioleaching k
Kinetic studies on copper metal leaching
Ch. Prabhudev, V. Shree Lakshmi
Accumulation and disposal of e-waste is a problem that our society faces today. Metal recovery from e-waste is normally achieved by hydrometallurgy, which is a slow and hazardous process that has a negative environmental effect and high operating costs. In this study bioleaching of e-waste was performed in a batch reactor using acetic acid. The most common metals found in e-waste are copper and si
A novel sequential heap leach process fo
James M. Mwase, Jochen Petersen
A novel sequential heap leaching process has been identified as a possible alternative to the conventional concentrate-smelt-refine route for processing Platreef ore, a platinum group metals containing ore with palladium predominance. The present study focuses on testing this process on crushed whole ore, after initial experiments conducted on low-grade Platreef flotation concentrate achieved prom
Oxidation of chalcopyrite by Acidithioba
D. Bevilacqua, A.L.L.C. Leite
Chalcopyrite oxidation was evaluated with two acidophilic thiobacilli that are important in bioleaching processes. Acidithiobacillus thiooxidans in pure culture did not oxidize CuFeS2, but oxidized externally added S0 in the presence of CuFeS2. Acidithiobacillus ferrooxidans released Cu2+ and soluble Fe from chalcopyrite, and the time course lead to a gradual passivation of chalcopyrite whereby Cu
Formation of jarosite during Fe2 oxidati
J. Daoud, D. Karamanev
Jarosite precipitation is a very important phenomenon that is observed in many bacterial cultures. In many applications involving Acidithiobacillus ferrooxidans, like coal desulphurization and bioleaching, it is crucial to minimize jarosite formation in order to increase efficiency. The formation of jarosite during the oxidation of ferrous iron by free suspended cells of A. ferrooxidans was studie