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Progress in bioleaching: fundamentals and mechanisms of …
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 ... Acid bioleaching. Acid leaching is applied in hydrometallurgy by using inorganic acids for the dissolution of ores, e.g ...
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Bioleaching of Zinc and Iron from Steel Plant Waste using
The bacterial leaching of zinc and iron from solid wastes at the Isdemir iron and steel plant has been investigated using Acidithiobacillus ferrooxidans as the bacterial agent. The effects of a range of operational parameters, including particle size, solids concentration and pH, on the efficiency of the bioleaching process were investigated. In each test, several variables …
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The influence of physicochemical parameters on the bioleaching …
The zinc extraction was 3.7-fold higher in the bioleaching compared to chemical leaching. The leaching rate of the sphalerite concentrate tended to decrease with decreasing pH from 1.8 to 1.2. ... Bioleaching and chemical leaching as an integrated process in the zinc industry. Miner. Eng., 591–599 (2007) Google Scholar. Deveci et al., 2004. H ...
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Bioleaching
Bioleaching has several advantages compared to conventional hydrometallurgy (the leaching of metals with acids or bases) or pyrometallurgy (the leaching of metals using thermal treatment), which have high energy requirements, require a large amount of chemicals, and also produce high levels of environmental pollution (Zeng et al., 2013).
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Removal of heavy metals from leaching effluents of sewage sludge …
Optimized system was then used for the anaerobic bioleaching and chemical leaching effluents and metal removal efficiencies of 27.1 ± 1.3% and 46.0 ± 4.3% were obtained, respectively. Considering integrated leaching and membrane separation processes, metal removal efficiencies obtained in this study are valuable as it will decrease the metal ...
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Lithium bioleaching: An emerging approach for the recovery of Li …
Chemical leaching as the most preferred method for metal recovery is fast and efficient yet has its environmental concerns. The environmental issues of the chemical leaching agents lead to the utilization of expensive leaching materials that are not affordable (Pandey and Natarajan, 2015; Pant et al., 2012).
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Synthetic biology approaches to copper remediation: bioleaching
The most widespread method for copper biomining is bioleaching: the extraction of soluble copper from complex solid mixtures (Gumulya et al. 2018). Therefore, it is not surprising that bioleaching has been the focus of recent approaches to copper bioremediation (Fonti, Dell'Anno and Beolchini 2016) and recycling (Drobíková et al. 2015).
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Review Advances in bioleaching for recovery of metals and
Using simulated chemical leaching with a mixture of 5237 ppm (w/w) citric acid, 3666 ppm gluconic acid, 1287 ppm oxalic acid and 188 ppm malic acid as comparison, it was …
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Extraction of copper from copper slag: Mineralogical insights, …
In the present study, a novel sequential bioreduction-bioleaching and bioreduction-chemical leaching route as a hybrid process is compared and discussed for the enhanced recovery of copper from an ...
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Feasibility of bioleaching integrated with a chemical oxidation …
Bioleaching is considered an eco-friendly technique for leaching metals from spent hydroprocessing catalysts; however, the low bioleaching yield of some valuable metals (Mo and V) is a severe bottleneck to its successful implementation. ... (<5%). The results suggested that the integrated bioleaching-chemical oxidation process is an effective ...
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Towards sustainable recycling of critical metals from e-waste
For instance, bioleaching has slower reaction rates than chemical leaching, which requires constant monitoring of parameters to ensure efficiency, resulting in increased capital expenses for larger vessels or more vessels and impellers, as well as higher energy demands due to the need for larger equipment and increased gas flow rates.
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An integrated approach of bioleaching-enhanced …
Methodology: In this study, bioleaching integrated with an electrokinetic ... treatment, and chemical leaching are used in the detoxification or decontamination of incineration fly ash (Abbas et ...
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Bioleaching and chemical leaching as an integrated process in …
This study is aimed to review existing processes to produce zinc metal and evaluate parameters of bio and direct leaching of zinc sulfide concentrates. The experiments, …
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Leaching: Types, Methods, Advantages, Disadvantages
Types of leaching Physical leaching. Physical leaching is a simple procedure for solute dissolution in a solvent. In this method, the solvent is frequently made up of water, alcohol, and other organic solvents. Bioleaching. Microorganisms are used in the bioleaching procedure to dissolve insoluble metal forms.
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Advances in the chemical leaching (inorgano …
Since bioleaching also involves the use of mostly chemicals, generated biochemically, therefore, presently authors have attempted to include some important biochemical cleaning processes under chemical leaching of …
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Bioleaching and chemical leaching as an integrated process …
This work sought to integrate bioleaching and chemical leaching as a cost-effective process to treat zinc sulphides. The continuous bioleaching of a sphalerite concentrate, assaying 51.4% …
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Bioleaching of Zinc Sulfide Concentrate in Redox-Controlled
The other metallurgical processes like pressure leaching or integrated sulfide-silicate process followed by solvent extraction process are few other processes ... (2007) Bioleaching and chemical leaching as an integrated process in the zinc industry. Miner Eng 20:591–599. Article Google Scholar Souza AD, Pina PS, Leão VA, Silva CA, Siqueira ...
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Bioleaching metal-bearing wastes and by-products for resource …
The global transition to a circular economy calls for research and development on technologies facilitating sustainable resource recovery from wastes and by-products. Metal-bearing materials, including electronic wastes, tailings, and metallurgical by-products, are increasingly viewed as valuable resources, with some possessing comparable or superior …
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Bioleaching and chemical leaching as an integrated process …
This work sought to integrate bioleaching and chemical leaching as a cost-effective process to treat zinc sulphides. The continuous bioleaching of a sphalerite concentrate, assaying 51.4% Zn, 1.9% Pb, 31.8% S and 9.0% Fe with mesophile iron and sulphur-oxidizing bacteria followed by chemical leaching of the bioleaching residue were assessed.
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Spent-medium leaching of germanium, vanadium and lithium …
Fig. 9 shows the results concerning metal recovery by chemical leaching and spent-medium bioleaching of roasted CFA. The outcomes showed that the recovery of Ge, V and Li was 24.4%, 26.1% and 22.4% higher using the spent-medium bioleaching compared to that in chemical leaching at approximately the same concentrations of the three organic acids.
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Integrated bioleaching of copper metal from waste printed
Chemical leaching is rapid and efficient but causes secondary pollution. Bioleaching is a promising approach, eco-friendly and economically feasible, but it is slower process. This review considers the recycling potential of microbes and suggests an integrated bioleaching approach for Cu extraction and recovery from WPCBs.
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Chemical and Bioreductive Leaching of Laterites and Serpentinite …
Experiments were conducted to evaluate domestic low-grade laterites and serpentinite waste as potential secondary sources of nickel and magnesium and to assess leaching residues for carbon dioxide adsorption. Solids were leached chemically using sulfuric acid, while bioreductive dissolution under anoxic conditions employed a consortium of …
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Implementation of biological and chemical techniques to recover metals
Bioleaching and chemical leaching of ores and residues for the recovery of valuable metals have become an increasingly attractive technology over recent years (Schippers et al., 2014).During the (bio)leaching process, most of the metals are brought into solution whereas some valuable trace metals remain in the solid (bio)leach residues, which can be recovered by …
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Feasibility of bioleaching integrated with a chemical oxidation …
The present study reported the potential of an integrated bioleaching-chemical oxidation process in improved leaching of valuable metals (Mo and V) from refinery spent hydroprocessing …
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From understanding the rate limitations of bioleaching …
The paper unpacks acidophile sulfide bioleaching mechanisms within bioreactors into various sub-processes and analyses them in terms of their rate limitations, such as gas-liquid mass transfer of oxygen and CO 2, diffusion constraints between and within mineral particles, competing side reactions etc.It becomes clear that microbial metabolic reactions are generally …
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Figure 7 from Bioleaching and chemical leaching as an integrated
Fig. 7. Effect of Fe(II) concentration on the chemical leaching of partially bioleached ZnS. Experimental conditions: 368 K (95 C), 10% solids, initial acidity 175 g/L. - "Bioleaching and chemical leaching as an integrated process in the zinc industry"
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Figure 1 from Bioleaching and chemical leaching as an integrated
DOI: 10.1016/J.MINENG.2006.12.014 Corpus ID: 55680986; Bioleaching and chemical leaching as an integrated process in the zinc industry @article{Souza2007BioleachingAC, title={Bioleaching and chemical leaching as an integrated process in the zinc industry}, author={Adelson Dias de Souza and Pablo dos Santos Pina and …
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Evaluation of the effects of L-cysteine addition on the bioleaching …
The objective of the current study is the investigation of the effect of L-cysteine on the bioleaching and chemical leaching of zinc and cadmium from sphalerite concentrate by two kinds of typical mesophilic and moderately thermophilic iron- and sulfur-oxidizing bacteria. ... Bioleaching and chemical leaching as an integrated process in the ...
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Indirect bioleaching recovery of valuable metals from …
A comparison of the bioleaching and the chemical leaching has given insight into the mechanism of Ni, Cu, Zn and Cr extraction from electroplating sludge. ... Integrated diffusion dialysis precipitation – cementation for selective recovery of leaching chemicals and metal values from electroplating sludge.
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An integrated approach of bioleaching-enhanced
In this research, the combination of bioleaching integrated with an electrokinetics approach for heavy metal remediation from MSW incineration fly ash using Acidithiobacillus ferrooxidans …
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