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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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The extraction rate was much higher for bioleaching than for chemical leaching experiments for all six experiments in agreement with literature data (e.g. Martin et al., 2015). ... Bioleaching and chemical leaching as an integrated process in the zinc industry. Min. Eng., 20 (2007), pp. 591-599.
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A comparison between fungal bioleaching and chemical leaching was also performed for the treatment of soils contaminated with smelting slags (Deng et al., 2013). Four different chemical leaching sets using citric, oxalic, malic, and succinic acid at 0.5% were carried out to compare with bioleaching using P. chrysogenum strain F1. The results ...
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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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Based on the results, chemical leaching and bioleaching processes demonstrated the highest HM removal efficiencies. However, chemical leaching involves the use of substantial quantities of chemical agents, both for the initial metal removal and the subsequent neutralization of the sludge. ... Following integrated metal leaching, sustainable ...
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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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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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The environmental challenges associated with chemical leaching agents require the deployment of expensive leaching materials, rendering them financially inaccessible (Pant et al., 2012). Despite being cost-effective, bioleaching takes longer to complete because of the intricate anabolic and catabolic processes that occur inside
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Fig. 2. Experimental set-up for the continuous bioleaching experiments. Bioreactor R2 has a 20 L volume whereas reactors R1, R3 and R4, have 12 L each. - "Bioleaching and chemical leaching as an integrated process in the zinc industry"
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Chemical leaching took shorter than bioleaching, but the leaching yield was lower, i.e. 41% for 4 h from Ghent samples, 44 % for 1 h from Delft samples, 48% for 1 h from thermally-treated Ghent ...
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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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Methodology: In this study, bioleaching integrated with an electrokinetic approach for heavy metal remediation from MSW incineration fly ash using Acidithiobacillus ferrooxidans and ...
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Sulfuric acid is a popular inorganic acid for chemical leaching. In bioleaching, ... 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 found that bioleaching increased Ni and V recoveries by 12% and 19%, respectively.
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Zinc recovery using chemical leaching and bioleaching for the samples without and with mechanical activation was shown in Fig. 5. In chemical leaching, the zinc recovery was obtained about 4% for the sample containing 0 and 30 wt% pyrite and without mechanical activation. But, mechanical activation led to the enhancement of zinc recovery to 12. ...
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This review discusses various techniques for de-metallization of sewage sludge, including aerobic- and anaerobic bioleaching, chemical leaching, electrokinetic treatment, and …
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Chemical leaching is rapid and efficient but causes secondary pollution. Bioleaching is a promising approach, eco-friendly and eco-nomically feasible, but it is slower process. This review con-siders the recycling potential of microbes and suggests an integrated bioleaching approach for Cu extraction and recov-ery from WPCBs.
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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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Semantic Scholar extracted view of "Recent trends and challenges in bioleaching technologies" by P. Kumar et al. ... Flotation tailings originating from copper ore processing were evaluated in terms of chemical and mineralogical features, leaching, and resource potential. The results ... Bioleaching and chemical leaching as an integrated ...
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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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The study's findings suggested that an integrated bioleaching-chemical oxidation process can be a highly effective method for the improved leaching of valuable metals from the …
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Reports suggest that zinc sulfide bioleaching efficiency can be enhanced by increasing the ferric ion concentration in the bioleaching medium [2]. The galvanic interaction …
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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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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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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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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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Compared with direct bioleaching and chemical leaching with commercial sulfuric acid, our results demonstrate that this approach is more cost-effective, quick, and …
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The results of 10 day leaches showed that, when using electrochemical bioleaching in an ORP range of 400 to 430 mV, copper recovery reaches about 80% which is 3.9, 1.5 and 1.17 times higher than ...
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Bioleaching is an environmentally friendly technology for commercial metal recovery from metal ores in mining. There is a growing interest in adapting the technology to remove heavy metals from solid wastes such as fuel ash and sewage sludge. ... Considers microorganisms or microbial communities as a whole to create an integrated picture of how ...
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Coal still remains an important source of power generation world over. Along with its usage, comes unwanted generation of noxious gas emissions, toxic metal releases into wastewater and other pollutants which ultimately lead to environmental concerns. So cleaning of coal through physical or chemical processes becomes utmost important. There are several …
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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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