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Journal articles on the topic 'Bioleaching'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Deblina, Ball, Guha Barman Subhabrata, and K. Banik A. "Studies on bioleaching of silica from Indian chromite ore by a silica tolerant Aspergillus niger AB200 : Characterisation of some physical parameters and scanning electron microscopic studies." Journal of Indian Chemical Society Vol. 87, Jul 2010 (2010): 857–62. https://doi.org/10.5281/zenodo.5797452.

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Department of Chemical Engineering, Biotechnology Division, Calcutta University, 92, Acharya Prafulla Chandra Road, Kolkata-700 009, India <em>E-mail:</em> deblina.ball@gmail.com <em>Manuscript received 21 August 2009, revised 14 December 2009, accepted 18 December 2009</em> The bioleaching of silica from chromite ore was studied to remove silica from low grade chromite ore and therefore Increase the percentage of chromium In the ore. Three microorganisms <em>Bacillus circulans</em>, <em>Saccharomyces cenvisiae</em> and <em>Aspergillus niger</em> were used for bioleaching studies. The results

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2

Sreeremya, S. "Bioleaching." Invertis Journal of Renewable Energy 6, no. 2 (2016): 86. http://dx.doi.org/10.5958/2454-7611.2016.00011.4.

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3

Casas-Vargas, Julián C., Cristóbal Martínez-Bussenius, Álvaro Videla, and Mario Vera. "Novel Indigenous Strains and Communities with Copper Bioleaching Potential from the Amolanas Mine, Chile." Minerals 14, no. 9 (2024): 867. http://dx.doi.org/10.3390/min14090867.

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Bioleaching, a process catalyzed by acidophilic microorganisms, offers a sustainable approach to metal extraction from sulfide minerals. Chalcopyrite, the world’s most abundant copper sulfide, presents challenges due to surface passivation limiting its bioleaching efficiency. Also, indigenous species and microbial communities may present high copper extraction rates and offer new possibilities for application in bioleaching processes. This study examines the bioleaching potential of microbial isolates and communities obtained from Amolanas Mine in Chile. Samples were collected, cultivated, and

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4

Martínez, Patricio, and Pilar Parada. "BioSigma Bioleaching Seeds (BBS): A New Technology for Managing Bioleaching Microorganisms." Advanced Materials Research 825 (October 2013): 305–8. http://dx.doi.org/10.4028/www.scientific.net/amr.825.305.

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In Bioleaching, although it is already prove that chalcopyrite can be dissolved by microorganisms, a major task is to do it efficiently in economical terms at industrial scale. BioSigma Bioleaching Seeds (BBS) represents a biotechnological breakthrough for the production of bioleaching solutions on demand with high concentrations of biomining microorganisms. This innovation is mainly a product based on the encapsulation of BioSigma bioleaching microorganisms in a natural matrix of alginate. This technology gives the following operational advantages: 1. High concentration of inoculum. 2. Long p

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Gao, Xue-Yan, Xiu-Jie Liu, Chang-Ai Fu, et al. "Novel Strategy for Improvement of the Bioleaching Efficiency of Acidithiobacillus ferrooxidans Based on the AfeI/R Quorum Sensing System." Minerals 10, no. 3 (2020): 222. http://dx.doi.org/10.3390/min10030222.

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Acidithiobacillus ferrooxidans is an acidophilic and chemolithotrophic sulfur- and iron-oxidizing bacterium that has been widely used in the bioleaching process for extracting metals. Extracellular polymeric substances (EPS) are essential for bacteria-ore interactions, and the regulation of EPS synthesis could be an important way of influencing the efficiency of the bioleaching process. Therefore, exploring and utilizing the regulatory pathways of EPS synthesis to improve the bacterial bioleaching capability have posed a challenge in the study and application of bioleaching bacteria. Here, sev

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Ruan, Ren Man, Gui Ying Zhou, and Jian Kang Wen. "Study on Selective Depression of Pyrite during Copper Bioleaching." Advanced Materials Research 20-21 (July 2007): 172–73. http://dx.doi.org/10.4028/www.scientific.net/amr.20-21.172.

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During Zijinshan copper heap bioleaching, pyrite was leached in plenty resulting in high ferric concentration in solution. This affected bioleaching and extraction processing greatly. The paper studied the factors influencing in the course of leaching of pyrite and a mixture of chalcocite and pyrite respectively. It focuses on the effect of the redox potential for copper bioleaching so as to find key factors affecting the dissolution difference between chalcocite and pyrite. The experiment results showed that redox potential is an important influencing factor in bioleaching. Copper and pyrite

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7

Guo, Ya Fei, Tian Long Deng, Nan Zhang, and Meng Xia Liao. "Tellurium Extraction from the Unique Independent Tellurium Ores in China by Bioleaching." Advanced Materials Research 343-344 (September 2011): 625–30. http://dx.doi.org/10.4028/www.scientific.net/amr.343-344.625.

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This study was designed to investigate tellurium bioleaching from the unique independent low-grade tellurium ores containing tetradymite, joseite, pyrite, chalcopyrite, silica, and a minor amount of dolomite, which is the first discovered scattered element deposit in the world. For the bioleaching, the tellurium extractions from the low-grade ores by with and without the adapted bacteria of acidophilic Thiobacillus ferrooxidans were examined. The effects of pH, pulp density, and temperature for bioleaching were studied systematically. After 20 days of bioleaching at 30°C, an 80 % of the tellur

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8

Hong, Maoxin, Xingxing Wang, Lingbo Wu, et al. "Intermediates Transformation of Bornite Bioleaching by Leptospirillum ferriphilum and Acidithiobacillus caldus." Minerals 9, no. 3 (2019): 159. http://dx.doi.org/10.3390/min9030159.

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Bioleaching experiments, electrochemical tests, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) were conducted to investigate the intermediates transformation of bornite by Leptospirillum ferriphilum and Acidithiobacillus caldus. The bioleaching experimental results showed that the presence of L. ferriphilum and A. caldus significantly accelerated the bornite bioleaching. In addition, the intermediate species of bornite bioleaching with these two kinds of bacteria were similar. Electrochemical analysis indicated that the dissolution of bornite was an acid-consuming process.

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Qayyum, Sadia, Ke Meng, Sidra Pervez, Faiza Nawaz, and Changsheng Peng. "Optimization of pH, temperature and carbon source for bioleaching of heavy metals by Aspergillus flavus isolated from contaminated soil." Main Group Metal Chemistry 42, no. 1 (2019): 1–7. http://dx.doi.org/10.1515/mgmc-2018-0038.

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Abstract Soil contamination with heavy metal content is a growing concern throughout the world as a result of industrial, mining, agricultural and domestic activities. Fungi are the most common and efficient group of heavy metal resistant microbe family which have potential for metal bioleaching. The use of filamentous fungi in bioleaching of heavy metals from contaminated soil has been developed recently. The current study intends to isolate a strain with the ability to degrade the pH value of the liquid medium. Identification results based on morphological and molecular biological analysis g

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10

Latyuk, Elena, Vitaliy Melamud, Anatoly Lavrinenko, Dmitriy Makarov, and Aleksandr Bulaev. "Non-Ferrous Metals and PGM Recovery from Low-Grade Copper–Nickel Concentrate by Bioleaching and Further Cyanidation." Minerals 12, no. 3 (2022): 340. http://dx.doi.org/10.3390/min12030340.

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The aim of the present work was to perform copper, nickel, and platinum group metals (PGMs) recovery from low-grade copper–nickel concentrate containing pyrrhotite, pentlandite, and chalcopyrite by bioleaching in stirred tank reactors in batch mode and subsequent cyanidation. The concentrate contained (%) Fe 32.7, Cu 0.7, Ni 2.3, Stotal 20.9, Ssulfide 17, 0.1 g/t Pt, and 1.35 g/t Pd. The bioleaching was performed at 30 and 40 °C using two different microbial consortia. At 30 °C, bioleaching was performed using mixed culture including Acidithiobacillus ferrivorans strains isolated from the samp

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11

Marcinčáková, Renáta, Alena Luptáková, Marek Vojtko, Martin Fujda, and Jana Sedláková-Kaduková. "Simultaneous lithium bioleaching and bioaccumulation from lepidolite using microscopic fungus Aspergillus niger." Nova Biotechnologica et Chimica 19, no. 2 (2020): 175–82. http://dx.doi.org/10.36547/nbc.v19i2.771.

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The leaching of lithium from lepidolite using the filamentous fungus Aspergilluss niger was examined. Two mechanisms were suggested – biochemical using citric acid as the main bioleaching agent and biomechanical through hyphae penetration confirmed by XRD and SEM analyses. The bioleaching processes were conducted at various glucose concentrations (5 – 20 g.L-1). The higher glucose concentration was, the higher Li bioleaching was observed. Li accumulation by fungal biomass played an important role in Li solubilisation from lepidolite. Totally, 11.5 mg of lithium were recovered from 1 kg of lepi

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12

Rendón-Castrillón, Leidy, Margarita Ramírez-Carmona, Carlos Ocampo-López, and Luis Gómez-Arroyave. "Bioleaching Techniques for Sustainable Recovery of Metals from Solid Matrices." Sustainability 15, no. 13 (2023): 10222. http://dx.doi.org/10.3390/su151310222.

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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 other metals from solid matrices. Fungal bioleaching effectively extracts a wide range of valuable metals, including nickel, vanadium, aluminium, molybdenum, cobalt, iron, manganese, silver, platinum,

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13

Opara, Chiamaka Belsonia, Nor Kamariah, Jeroen Spooren, Katrin Pollmann, and Sabine Kutschke. "Interesting Halophilic Sulphur-Oxidising Bacteria with Bioleaching Potential: Implications for Pollutant Mobilisation from Mine Waste." Microorganisms 11, no. 1 (2023): 222. http://dx.doi.org/10.3390/microorganisms11010222.

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For many years, research on the microbial-dissolution of metals from ores or waste materials mainly focussed on the study of acidophilic organisms. However, most acidophilic bioleaching microorganisms have limited tolerance to high chloride concentrations, thereby requiring fresh water for bioleaching operations. There is a growing interest in the use of seawater for leaching purposes, especially in regions with less access to fresh water. Consequently, there is a need to find halophilic organisms with bioleaching potentials. This study investigated the bioleaching potentials of four moderatel

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14

Yachkula, Alyona, Olga Rozova, Tatiana Abashina, Mikhail Vainshtein, Denis Grouzdev, and Aleksandr Bulaev. "Attempts to Stimulate Leaching Activity of Acidithiobacillus ferrooxidans Strain TFBk." Minerals 12, no. 8 (2022): 1051. http://dx.doi.org/10.3390/min12081051.

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Autotrophic acidophilic bacteria Acidithiobacillus ferrooxidans is a model species for studying metal bioleaching from low-grade sulfide ores and concentrates. Arsenopyrite gold-bearing concentrates are refractory and often processed using biohydrometallurgical approaches; therefore, it is important to develop methods to improve arsenopyrite bioleaching. In the present work, we have studied the possibility of improving arsenopyrite concentrate bioleaching by the strain of A. ferrooxidans. For this purpose, we have analyzed the genome of the strain A. ferrooxidans TFBk to reveal the genes poten

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15

Bai, Jing, Jiang Kang Wen, Song Tao Huang, Biao Wu, and Bo Wei Chen. "The Bioleaching Characteristics of Chalcopyrite with Different Genetic Types." Advanced Materials Research 825 (October 2013): 443–46. http://dx.doi.org/10.4028/www.scientific.net/amr.825.443.

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The copper extraction yield from thermophilic bioleaching of chalcopyrite depends on temperature, pH, and the oxidation-reduction potential (ORP), the activity of the thermophile used, as well as on the different genetic type of the chalcopyrite used. The bioleaching characteristics of chalcopyrite from marine volcanic type and porphyry type, and the influence of genetic type on microbial community were studied. The results indicated that the bioleaching of chalcopyrite is controlled by the ORP rather than by the pH. The thermophiles composition of marine volcanic type bioleaching wasMetallosp

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16

Wu, Biao, Jian Kang Wen, Gui Ying Zhou, and Ren Man Ruan. "Control of the Redox Potential by Oxygen Limitation Inhibits Bioleaching of Pyrite." Advanced Materials Research 71-73 (May 2009): 401–4. http://dx.doi.org/10.4028/www.scientific.net/amr.71-73.401.

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Based on the bioleaching mechanism and electrochemical studies of metal sulfides, the dissolution rate of secondary copper sulfides and pyrite are controlled by redox potentials. Experiment on the bioleaching of the secondary copper sulfides under constant potential by sparging with nitrogen gas demonstrated, by analyzing Cu and Fe content of the bioleaching solution and residues, the pyrite and secondary cooper sulfides dissolution rates have large difference in various redox potential. The pyrite and secondary cooper sulfides have good selection when the redox potential controlled between 70

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17

Luo, Wang, Yiran Li, Shiqi Chen, Yili Liang, and Xueduan Liu. "Roles and Regulation of Quorum Sensing of Acidophiles in Bioleaching: A Review." Microorganisms 12, no. 3 (2024): 422. http://dx.doi.org/10.3390/microorganisms12030422.

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Bioleaching has gained significant attention as a cost-effective and environmentally friendly approach for extracting metals from low-grade ores and industrial byproducts. The application of acidophiles in bioleaching has been extensively studied. Among the various mechanisms leaching microorganisms utilize, quorum sensing (QS) is pivotal in regulating their life activities in response to population density. QS has been confirmed to regulate bioleaching, including cell morphology, community structure, biofilm formation, and cell metabolism. Potential applications of QS have also been proposed,

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18

Siezen, Roland J., and Greer Wilson. "Bioleaching genomics." Microbial Biotechnology 2, no. 3 (2009): 297–303. http://dx.doi.org/10.1111/j.1751-7915.2009.00108.x.

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19

Chen, S. Y., J. G. Lin, and C. Y. Lee. "Effects of ferric ion on bioleaching of heavy metals from contaminated sediment." Water Science and Technology 48, no. 8 (2003): 151–58. http://dx.doi.org/10.2166/wst.2003.0464.

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Bioleaching is one of the promising procedures for removal of heavy metals from contaminated sediments. The advantages of this biotechnology are that it is easy, efficient, less costly and friendly to the environment. However, the principal disadvantage of this process is its slow kinetics in metal solubilization, which may limit practical application of the bioleaching process. In order to enhance the rate and efficiency of metal solubilization, the ferric ion was used as a catalytic agent in the bioleaching process. It was found that the sediment pH apparently decreased in the bioleaching af

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20

Zhou, Qingyang, Jingqing Gao, Yonghong Li, et al. "Bioleaching in batch tests for improving sludge dewaterability and metal removal using Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans after cold acclimation." Water Science and Technology 76, no. 6 (2017): 1347–59. http://dx.doi.org/10.2166/wst.2017.244.

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Bioleaching is a promising technology for removal of metals from sludge and improvement of its dewaterability. Most of the previous studies of bioleaching were focused on removal of metals; bioleaching in cold environments has not been studied extensively. In this study, Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans were acclimated at 15 °C and co-inoculated to explore the optimal conditions for improvement of sludge dewaterability and removal of metals by the sequencing batch reactors. The data show after 6 days of bioleaching at 15 °C, 89.6% of Zn, 72.8% of Cu and 39.4% of

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Caicedo, Juan Carlos, Sonia Villamizar, and Giampaolo Orlandoni. "The use of synthetic agonists of quorum sensing N- acyl homoserine lactone pathway improves the bioleaching ability in Acidithiobacillus and Pseudomonas bacteria." PeerJ 10 (August 9, 2022): e13801. http://dx.doi.org/10.7717/peerj.13801.

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Metal solubilization from discarded electrical material and electronic devices (e-waste) using the bioleaching capabilities of bacterial cells is highly effective. However, gaps in understanding about the microbiological processes involved in the bioleaching reaction leads to less efficient metal solubilization in large-scale e-waste processing. In this study, bacterial species belonging to the genera Acidithiobacillus and Pseudomonas were used to leach copper and gold from discarded printed circuit boards (PCB). Through modulation of the cell-to-cell communication system in these bacteria, ph

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22

Liu, Xiaoliang, Qian Li, Yan Zhang, Yongbin Yang, Bin Xu, and Tao Jiang. "Formation Process of the Passivating Products from Arsenopyrite Bioleaching by Acidithiobacillus ferrooxidans in 9K Culture Medium." Metals 9, no. 12 (2019): 1320. http://dx.doi.org/10.3390/met9121320.

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Arsenopyrite is a common sulphide mineral occurring in deposits of gold ore that makes the extraction of gold difficult and, thus, pre-treatment is necessary prior to gold leaching. Bioleaching pre-treatment of arsenopyrite has drawn significant attention owing to its environmental friendliness, low cost and simple operation. A critical impedance of bioleaching to its large-scale industrial application is the slow leaching kinetics. Various passivating products on the surface of arsenopyrite have been found to limit the bioleaching process. This paper reports results from an in-depth investiga

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Vardanyan, Arevik, Ruiyong Zhang, Anna Khachatryan, et al. "Extraction of Copper from Copper Concentrate by Indigenous Association of Iron-Oxidizing Bacteria." Separations 11, no. 4 (2024): 124. http://dx.doi.org/10.3390/separations11040124.

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Bioleaching of Cu from the copper concentrate of Armanis gold-bearing polymetallic ore (Armenia) was investigated. The main objective was revealing high active bacteria and their association, as well as optimizing the bioleaching process with their application to ensure the most efficient recovery of copper from the tested concentrate. To obtain optimal bacterial associations, bottom-up and top-down approaches were used. Bioleaching of copper concentrate was carried out using pure cultures of iron- and sulfur-oxidizing bacteria and their mixed culture, as well as indigenous bacterial consortiu

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Jia, Yan, Renman Ruan, Jingkui Qu, Qiaoyi Tan, Heyun Sun, and Xiaopeng Niu. "Multi-Scale and Trans-Disciplinary Research and Technology Developments of Heap Bioleaching." Minerals 14, no. 8 (2024): 808. http://dx.doi.org/10.3390/min14080808.

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Heap bioleaching is considered to be a less energy-intensive metal-extraction technique compared to other methods, making it particularly attractive for low-grade sulfide ores. It has been successfully applied to recovery of copper, gold, and uranium from ores over decades. Despite its seemingly straightforward nature, heap bioleaching can experience failures if the ore is unsuitable or the heap leach process is not thoroughly investigated and well-developed. Therefore, multidisciplinary approaches are essential for research and development in heap bioleaching, as its performance depends on nu

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Jiang, Mingjun, Siyu He, and Yongkui Zhang. "Bioleaching Extraction of Valuable Metal From E-Wastes: A Mini Review." Recent Innovations in Chemical Engineering (Formerly Recent Patents on Chemical Engineering) 16, no. 5 (2023): 306–23. http://dx.doi.org/10.2174/0124055204271800230926111857.

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Abstract: Electrical waste (E-waste) is a significant global issue, with an annual generation of over 50 million tons, causing detrimental effects on both the environment and human health. However, E-waste is also known as a secondary valuable metal resource. Although hydrometallurgy and pyrometallurgy are still the preferred methods for metal recovery from E-wastes, bioleaching has gained significant attention as a promising alternative for metal recovery from E-wastes due to its sustainability, environmental friendliness, and cost efficiency. In this review, different chemical principles of

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Sadowski, Zygmunt, and Joanna A. Baranska. "Hydrodynamic Study Of Column Bioleaching Processes." Nova Biotechnologica et Chimica 14, no. 1 (2015): 52–61. http://dx.doi.org/10.1515/nbec-2015-0014.

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Abstract The modelling of flow leaching solution through the porous media has been considered. The heap bioleaching process can be tested using the column experimental equipment. This equipment was employed to the hydrodynamic studies of copper ore bioleaching. The copper ore (black shale ore) with the support, inertial materials (glass small balls and polyethylene beads) was used to the bioleaching tests. The packed beds were various composition, the ore/support ratio was changed. The correlation between the bed porosity and bioleaching kinetics, and copper recovery was investigated.

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Gericke, Mariekie. "Base Metal Tank Bioleaching: From Laboratory Test Work to Commercialization." Advanced Materials Research 1130 (November 2015): 197–200. http://dx.doi.org/10.4028/www.scientific.net/amr.1130.197.

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The tank bioleaching of metal sulphides is an established technology. Commercial success started with the treatment of refractory gold concentrates using mesophilic micro-organisms, followed by the development of tank bioleaching processes for the treatment of base metal concentrates. This was initially a mesophilic process treating secondary copper sulphides, pentlandite and cobaltiferous pyrite. There was though limited potential for recovery of copper from chalcopyrite concentrates due to low copper extractions. Over the past decades the optimization of bioleaching processes for the treatme

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Natrajan, Gayathri, and Yen Peng Ting. "Two-Step Bioleaching and Spent Medium Leaching of Gold from Electronic Scrap Material Using Chromobacterium violaceum." Advanced Materials Research 825 (October 2013): 270–73. http://dx.doi.org/10.4028/www.scientific.net/amr.825.270.

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Rapid technological advancement and the relatively short life time of electronic goods have resulted in an alarming growth rate of electronic waste which often contains significant quantities of toxic and precious metals. Compared to conventional chemical recovery methods, bioleaching has been shown to be an environmentally friendly process for metal extraction. In this work, gold bioleaching from electronic scrap material (ESM) was examined using batch cultures of the bacterium Chromobacterium violaceum which produces cyanide as a secondary metabolite. Gold was bioleached via gold cyanide com

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Chen, Gongxin, Zhanxue Sun, and Yajie Liu. "Continued Multicolumns Bioleaching for Low Grade Uranium Ore at a Certain Uranium Deposit." Journal of Nanomaterials 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/1683416.

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Bioleaching has lots of advantages compared with traditional heap leaching. In industry, bioleaching of uranium is still facing many problems such as site space, high cost of production, and limited industrial facilities. In this paper, a continued column bioleaching system has been established for leaching a certain uranium ore which contains high fluoride. The analysis of chemical composition of ore shows that the grade of uranium is 0.208%, which is lower than that of other deposits. However, the fluoride content (1.8% of weight) is greater than that of other deposits. This can be toxic for

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Liu, Mei Lin, Ren Man Ruan, Jian Kang Wen, and Dian Zuo Wang. "Investigation of Viscosity and Thermodynamic Properties on the Bioleaching Solution with and without Mesophilic Bacteria." Advanced Materials Research 20-21 (July 2007): 149–51. http://dx.doi.org/10.4028/www.scientific.net/amr.20-21.149.

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In this study, the viscosities and conductivities of bioleaching solution were determined by Ubbelohde viscometer and conductivity meter, respectively. The mean ionic activity coefficients, relative partial molar free energies of copper bioleaching solution at above experimental temperatures ranging from 298 K to 313 K have been calculated. Simultaneously, these characters of copper bioleaching solution were compared with and without mesophilic bacteria. The experimental data showed that the viscosities and thermodynamic properties for bioleaching solution would be crucial to minimize the thir

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Artykova, Alena, Yuliya Elkina, Aleksandra Nechaeva, Vitaliy Melamud, Anna Boduen, and Aleksandr Bulaev. "Options for Increasing the Rate of Bioleaching of Arsenic Containing Copper Concentrate." Microbiology Research 13, no. 3 (2022): 466–79. http://dx.doi.org/10.3390/microbiolres13030032.

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In the present work the effect of alkaline sulfide leaching (ASL) on the extraction of copper and zinc from low-grade copper concentrate containing chalcopyrite, tennantite, sphalerite, and pyrite during batch and continuous bioleaching experiments was studied. It was demonstrated that ASL and further bioleaching may be a promising approach for treatment of copper–zinc concentrates containing tennantite as this approach allows increasing copper extraction degree in comparison to one-stage bioleaching by 1.6–2.3 times. Thus, ASL was shown to be effective for pretreatment of tennantite containin

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Tichy, R., W. H. Rulkens, J. T. C. Grotenhuis, V. Nydl, C. Cuypers, and J. Fajtl. "Bioleaching of metals from soils or sediments." Water Science and Technology 37, no. 8 (1998): 119–27. http://dx.doi.org/10.2166/wst.1998.0316.

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Bioleaching can be one of few techniques applicable for the removal of toxic metals from polluted soils or sediments. Its principle is a microbial production of sulphuric acid and leaching of metals with it. The use of bioleaching can benefit from the use of low-cost substrates and from a possible coupling to other processes of microbial sulphur cycle, like sulphate reduction to treat spent bioleaching liquor, or partial sulphide oxidation to recycle sulphur. For the evaluation of bioleaching, the existence of different leaching strategies is considered, i.e. intensive or extensive extraction.

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Bobadilla-Fazzini, Roberto A. "Mineralogical Dynamics of Primary Copper Sulfides Mediated by Acidophilic Biofilm Formation." Solid State Phenomena 262 (August 2017): 325–29. http://dx.doi.org/10.4028/www.scientific.net/ssp.262.325.

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Bioleaching of copper sulfides is catalyzed by iron-and sulfur-oxidizing acidophilic microorganisms attached to the mineral surface forming a biofilm. However, the link between copper sulfides bioleaching and biofilm formation is not yet fully understood. Understanding the factors that are limiting the bioleaching kinetics for different copper sulfide minerals through exhaustive mineralogical analysis of the mineral surface with concomitant biofilm formation during the leaching process will deliver new process conditions with enhanced kinetics and higher copper recovery. In this work we have d

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A, Gunjal. "Bioleaching - Eco-Friendly Approach for Management of Electronic Waste." Open Access Journal of Microbiology & Biotechnology 8, no. 2 (2023): 1–2. http://dx.doi.org/10.23880/oajmb-16000259.

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The different types of wastes viz., food, electronic, household, medical, etc. accumulate in large amount. The electronic waste is a serious problem which needs an urgent solution. The chemical process has disadvantages which is costly and causes soil and water pollution. Bioleaching using the microorganisms is a two-step process which can be used for the management of electronic wastes. The bioleaching is economical, eco-friendly and easy process in this. Bioleaching which is a biological process is very important. It is a sustainable approach. The metals leached during bioleaching can be use

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35

Bulaev, Aleksandr, Vitaliy Melamud, and Anna Boduen. "Bioleaching of Non-Ferrous Metals from Arsenic-Bearing Sulfide Concentrate." Solid State Phenomena 299 (January 2020): 1064–68. http://dx.doi.org/10.4028/www.scientific.net/ssp.299.1064.

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Tank bioleaching of substandard arsenic-bearing sulfide copper–zinc concentrate, containing 1.70, 6.22, and 7.30% of arsenic, copper, and zinc, was performed. The concentrate contained pyrite, chalcopyrite, tennantite, and sphalerite. Bioleaching was performed at 40°C using a mixed culture of acidophilic microorganisms in two modes. In the first mode, pulp density was 10%, while in the second it comprised 15%. Bioleaching made it possible to extract 17 and 70% of copper and zinc in the first mode, and 15 and 72% of copper and zinc in the second mode. The results obtained that bioleaching can b

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Zhang, Ruichang, Xuefeng Wei, Qiang Hao, and Ruofan Si. "Bioleaching of Heavy Metals from Municipal Solid Waste Incineration Fly Ash: Availability of Recoverable Sulfur Prills and Form Transformation of Heavy Metals." Metals 10, no. 6 (2020): 815. http://dx.doi.org/10.3390/met10060815.

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Bioleaching is an effective and promising approach for the recovery or removal of heavy metals from metal-laden municipal solid waste incineration fly ash. To exclude the risk of reacidification of the leached fly ash after bioleaching with sulfur powder, molded sulfur prills were used as energy substrate for sulfur oxidizing bacteria to examine the availability of reusing the recyclable sulfur forms. The chemical species of heavy metals during the bioleaching process were also investigated. Results showed that the pH reduction, sulfate production, and metal solubilization with sulfur prills w

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Bulaev, Aleksandr, and Vitaliy Melamud. "Two-Stage Oxidative Leaching of Low-Grade Copper–Zinc Sulfide Concentrate." Microorganisms 10, no. 9 (2022): 1781. http://dx.doi.org/10.3390/microorganisms10091781.

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Bioleaching may be effectively used to extract nonferrous metals from sulfide ores and concentrates. At the same time, some minerals are refractory and their bioleaching rate is often comparatively low that does not allow the required metal extraction rate to be achieved. In the present work, we studied the two-stage process, which included stages of biological and chemical leaching, to improve copper extraction from low grade Cu–Zn sulfide concentrate containing chalcopyrite, tennantite, pyrite, and sphalerite. Bioleaching was conducted in the continuous mode in three laboratory scale reactor

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Wang, Kan, Yuandong Liu, Run Liu, et al. "Isolation, Sphalerite Bioleaching, and Whole Genome Sequencing of Acidithiobacillus ferriphilus QBS3 from Zinc-Rich Sulfide Mine Drainage." Life 15, no. 5 (2025): 792. https://doi.org/10.3390/life15050792.

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The genus Acidithiobacillus has been widely used in bioleaching, and novel strains in this genus, such as A. ferriphilus, have also been confirmed to possess bioleaching capabilities. In this study, an Acidithiobacillus ferriphilus strain, QBS3, was isolated from zinc-rich sulfide mine drainage using the gradient dilution method. QBS3 is a Gram-negative, 1.3 µm rod-shaped bacterium with small red colonies. It showed a high iron oxidation efficiency of 0.361 g/(L·h) and a sulfur oxidation efficiency of 0.206 g/(L·d). QBS3 has sphalerite bioleaching ability; using QBS3 for pure sphalerite biolea

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Cui, Xing Lan, Hao En Zuo, Jian Kang Wen, Biao Wu, and Yuan Ning. "Bioleaching and Desulfurization of Pyrite Roasting Residues by NB Bacteria for the Recovery of Cu, Zn and the Magnetic Materials." Key Engineering Materials 748 (August 2017): 451–55. http://dx.doi.org/10.4028/www.scientific.net/kem.748.451.

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The experiment focused on the bioleaching and desulfurization of pyrite roasting residues by the bacteria for the recovery of Cu, Zn and the magnetic materials. First of all, the study systematically performed XRD, which provided scientific and technique basis for extraction of valuable metals. Subsequently, the effect of the pH, the temperature and the bacterial inoculum volume ratio on the bioleaching was investigated. The data revealed that the condition under the pH of 1.2, the temperature of 45°C and bacterial inoculum volume ratio of 10% had the most significant effect on the bioleaching

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Sun, Jianzhi, Jiankang Wen, Biao Wu, and Bowei Chen. "Mechanism for the Bio-Oxidation and Decomposition of Pentlandite: Implication for Nickel Bioleaching at Elevated pH." Minerals 10, no. 3 (2020): 289. http://dx.doi.org/10.3390/min10030289.

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This work investigated the effects of Fe3+, H+ and adsorbed leaching bacteria on the bioleaching of pentlandite. Collectively, an integrated model for the oxidation and decomposition of pentlandite was built to describe the behaviors of different components in a bioleaching system. Proton ions and ferric ions could promote the break and oxidation of Ni-S and Fe-S bonds. The iron-oxidizing microorganisms could regenerate ferric ions and maintain a high Eh value. The sulfur-oxidizing microorganisms showed significant importance in the oxidation of polysulfide and elemental sulfur. The atoms in p

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Lisafitri, Yuni, and Edwan Kardena. "Progress and Challenges of Biological Leaching of Heavy Metal in Coal Ash from a Power Plant." Journal of Engineering and Technological Sciences 55, no. 1 (2023): 79–90. http://dx.doi.org/10.5614/j.eng.technol.sci.2023.55.1.8.

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Bioleaching is a technique for reducing the heavy metal content of coal ash by using bacteria, fungi, or yeast. Previous studies in heavy metal bioleaching of coal ash discussed the factors affecting the process, but as yet there is little information on the challenges of using microorganisms. Therefore, this study aimed to obtain comprehensive information regarding the use of microorganisms in heavy metal bioleaching. Heavy metal concentrations in coal ash are low, and the metals are diverse. The components of coal ash are complexes that cannot leach certain heavy metals according to previous

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Jiang, Xiao, Meilian Man, and Weimin Zeng. "Study on Chalcopyrite Dissolution Mechanism and Bioleaching Community Behavior Based on Pulp Concentration Gradient at 6 °C." Minerals 14, no. 7 (2024): 698. http://dx.doi.org/10.3390/min14070698.

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Low-temperature bioleaching is relevant to the recovery of metals in alpine mines, but its development has been constrained by low bioleaching rates at high pulp concentrations. To this end, the bioleaching effect of the microbial community after the domestication of pulp concentration at 6 °C was studied. Domestication improved the bioleaching rate of copper. Environmental scanning electron microscopy (ESEM), X-ray diffraction (XRD), and electrochemical measurements revealed that the domestication process aggravated the corrosion of the chalcopyrite surface by accelerating its dissolution rea

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Chen, Guo Bao, Hong Ying Yang, and Hai Jun Li. "An In Situ Characterization for the Bioleaching Process of Natural Pyrite Using Electrochemical Noise Technique." Advanced Materials Research 1130 (November 2015): 268–72. http://dx.doi.org/10.4028/www.scientific.net/amr.1130.268.

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An in situ characterization has been carried out for several active systems (sulfuric acid, ferric iron, 9k medium and bioleaching solutions) to investigate the bioleaching process of natural pyrite using electrochemical noise (ECN) technique. Spectral noise impedance spectra obtained from power spectral density (PSD) plots for the different systems were compared. It has been observed that the bioleaching system obtained the lowest noise resistance Rsn 0.101MΩ. The reaction mechanism was proposed based on experimental data analysis. The bioleaching process of natural pyrite has been identified

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Veeramalini, J. B., P. Vinosh Muthukumar, Charulatha S, S. Indhuja, and Sharmila R, Thanuja A. "Recycling e-Waste by Co-culture Bioleaching Process." Cuestiones de Fisioterapia 54, no. 3 (2025): 1541–54. https://doi.org/10.48047/67g0vc87.

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The recovery of metals from electronic waste (E-waste) has seen significant growth, driven by increased global consumption and the rapid advancement of new technologies. Printed circuit boards (PCBs) are a major contributor to E-waste accumulation due to their valuable metal content. The initial pH of the bioleaching process strongly influences metal recovery and subsequent metal precipitation. Notably the work aims to one-step bioleaching, the two-step bioleaching process reduces the toxic effects of PCBs. Bioleaching research work have shown that Penicillium simplicissimum can recover metals

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Štyriaková, Darina, Iveta Štyriaková, Jaroslav Šuba, Peter Baláž, and Tomasz Abramowski. "Bioleaching Test of Polymetallic Nodule Samples from the IOM Exploration Area." Minerals 12, no. 11 (2022): 1373. http://dx.doi.org/10.3390/min12111373.

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The Interoceanmetal Joint Organization’s (IOM) exploration license is granted in the area located within the Clarion–Clipperton Zone of the Eastern Central Pacific. All activities related to exploration of minerals in this area are beyond the limits of national jurisdiction and come under the provision of the United Nations Convention on the Law of the Sea and related regulations. The geological survey, which was the subject of the exploration, focused on the polymetallic nodule deposits. Other activities covered the tests of nodule processing, including alternative methods of metal extraction

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Dilsha, K. M., Shankar Suman, Aryaman Bhardwaj, et al. "Turning trash into treasure- The Bioleaching Solution." International Journal of Science and Social Science Research 2, no. 3 (2024): 230–37. https://doi.org/10.5281/zenodo.14516834.

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The escalating global discard of electronic devices has propelled the issue of e-waste disposal and recycling to the forefront. In the E-waste, presence of hazardous materials like lead, mercury, and cadmium, poses significant environmental and health risks if not managed properly. However, conventional recycling methods including open burning and acid baths worsen environmental degradation rather than mitigating it. Similarly, traditional metal extraction techniques like open-pit mining and smelting contribute to habitat destruction, air and water pollutions. To combat these challenges,

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Dangton, Jarurat, and Quanchai Leepowpanth. "A Study of Gold Recovery from E-Waste by Bioleaching Using Chromobacterium violaceum." Applied Mechanics and Materials 548-549 (April 2014): 280–83. http://dx.doi.org/10.4028/www.scientific.net/amm.548-549.280.

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Chromobacterium violaceumis able to produce and detoxify small amounts of cyanide that has been used to recover gold from Electronic scrap materials (ESM). The particle size ≤75 μm fraction was used, containing 0.22% Au and 33.0% Cu. The bioleaching was carried out in 500 ml Erlenmeyer flask with 200 ml LB medium at 0.5% pulp density in pH 9 and shaking in an incubator shaker (200 rpm) at 30°C. The experiment featured two variables, copper removal with nitric acid and 2 leaching times, 1-step and 2-step bioleaching for enhanced cyanide production and gold dissolution. The maximum cyanide produ

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Nie, Zhenyuan, Weiwei Zhang, Hongchang Liu, et al. "Synchrotron Radiation Based Study of the Catalytic Mechanism of Ag+ to Chalcopyrite Bioleaching by Mesophilic and Thermophilic Cultures." Minerals 8, no. 9 (2018): 382. http://dx.doi.org/10.3390/min8090382.

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The catalytic mechanism of Ag+ for chalcopyrite bioleaching by mesophilic culture (at 30 °C) and thermophilic culture (at 48 °C) was investigated using synchrotron radiation-based X-ray diffraction (SR-XRD) and S K-edge and Fe L-edge X-ray absorption near edge structure (XANES) spectroscopy. Bioleaching experiments showed that copper extraction from chalcopyrite bioleaching by both cultures was promoted significantly by Ag+, with more serious corrosion occurring on the minerals surface. SR-XRD and XANES analyses showed that the intermediates S0, jarosite and secondary minerals (bornite, chalco

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Kang, Jin-Kyu, Kang-Hee Cho, Song-Bae Kim, and Nag-Choul Choi. "Artificial Neural Network Modeling for Prediction of Dynamic Changes in Solution from Bioleaching by Indigenous Acidophilic Bacteria." Applied Sciences 10, no. 21 (2020): 7569. http://dx.doi.org/10.3390/app10217569.

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In this study, indigenous acidophilic bacteria living in mine drainage and hot acidic spring were collected and used for bioleaching experiments. The incubated indigenous acidophilic bacteria were inoculated on various minerals. The changes in pH, Eh, and heavy metal concentrations were examined with uninoculated controls to study bioleaching over time. As a result, the aspects of bioleaching varied greatly depending on the origin of microorganisms, the type of minerals, the temperature conditions, etc. We applied an ANN model to express and predict these complex bioleaching trends. Through th

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Deng, Yan, Xue Duan Liu, Hong Wei Liu, et al. "Bioleaching of Cadmium from Contaminated Paddy Fields by Consortium of Autotrophic and Indigenous Cadmium-Tolerant Bacteria." Solid State Phenomena 262 (August 2017): 617–21. http://dx.doi.org/10.4028/www.scientific.net/ssp.262.617.

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It has been a major issue for urgent solution in China as a result of a series of poisoning cases caused by cadmium. Yet there is no effective methods for removal of cadmium from the paddy soils. Microbial leaching process as an effective approach is currently applied to remediate the contaminated soils. In this study, bioleaching of cadmium from contaminated paddy soils by consortium of autotrophic and indigenous cadmium-tolerant bacteria was applied. The bioleaching results showed that the leaching rate of cadmium was from 74.93% to 92.76%. The distribution of the Cd fractions had a signific

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