bioleaching and chemical leaching as an integrated

Bioleaching and chemical leaching as an integrated …

Considering bioleaching and chemical leaching as integrated processes, the overall leaching time is reduced as compared to that observed by Pani et al. (2003) for the complete bioleaching of ZnS; nevertheless the residence time is still relatively large. As a result, this route would be most suitable for small expansions in RLE plants, such as ...

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Comparison of bioleaching behaviors of different ...

Souza AD, Pina PS, Leao VA (2007) Bioleaching and chemical leaching as an integrated process in the zinc industry. Miner Eng 20:591–599. doi: 10.1016/j.mineng.2006.12.014 Deller G (2005) World zinc supply and demand-heading for a late-decade price spike.

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(PDF) Bioleaching and bioprecipitation of nickel and iron ...

The mechanism of bioleaching or in situ leaching is discussed in terms of close physical and chemical association between the fungal hyphae and mineral phases in the ore.

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Bioleaching of copper from waste printed circuit boards by ...

Although bioleaching generally requires a longer period of operation compared to chemical leaching, it achieves higher removal efficiency for heavy metals and may be an alternative or adjunct to conventional physicochemical treatment of dewatered metal plating sludge for the removal hazardous heavy metals.

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Recover Manganese from Bioleaching Solution

Objectives of the current study were to evaluate methods for recovering the manganese from sugar-depleted column bioleaching media and to develop an integrated bioleaching-recovery system for recovering the manganese and recycling the residual solution. Recycling media to the bioleaching stage is a necessary water conservation measure.

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Integrated bioleaching of copper metal from waste …

12%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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Bioleaching and chemical leaching as an integrated …

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% ...

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Bioleaching reaction - BioMineWiki

In bioleaching of pyrite there is an initial chemical leaching where Fe 3+ oxidises the mineral: 4FeS 2 + 4Fe 2 (SO 4 ) 3 → 12Fe(SO 4 ) + 8S The ferrous sulphate and elemental sulphur formed is then oxidised with the aid of microbes according to the following reactions:

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Bioleaching and chemical leaching as an integrated …

Abstract. 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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Bioleaching and chemical leaching as an integrated …

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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Recovery of valuable metals from waste printed circuit ...

Furthermore, bioleaching ability of A. niveus was compared with chemical leaching. 2.3.1 One-step bioleaching. One-step bioleaching was performed using 0.1% (wt/vol) different sized particles of WPCBs in 250 ml shake flasks containing 100 ml of organic acid production medium. The initial pH was adjusted to 6.0 using 0.1 N NaOH or 0.1 N HNO 3 ...

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Bioleaching of nickel, copper and cobalt in low-grade ...

Southwood et al. studied some important parameters affecting the bioleaching of low-grade nickel ore, indicating that the physical and chemical properties of the ore, the permeability and porosity of the leach are the main factors affecting the leaching rate and the leaching rate. The presence of a large number of gangue hinders the nickel ...

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Bioleaching and chemical leaching as an integrated process ...

Abstract. 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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Bioleaching/ Bacterial Leaching Research Papers - Academia.edu

Then chemical leaching was applied as a comparison to bioleaching, using organic acids (citric, oxalic, acetic and gluconic acids) as well as a mixture of acids. According the results, the maximum dissolution yield of nickel, cobalt and iron were detected respectively as 95.3%, 74.3% and 50.0% by biocatalytic processes which containing 25% (w/v ...

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Bioleaching and chemical leaching of heavy metals from ...

Bioleaching can be a feasible and sustainable alternative to reduce de costs of the chemical leaching method. Its principle is the microbial production of sulfuric acid and subsequent solubilization of heavy metals. Tichy (1998) defines bioleaching as a process mediated by …

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Removal of heavy metals from leaching effluents of sewage ...

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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Bioleaching and chemical leaching as an integrated process ...

Bioleaching and chemical leaching as an integrated process in the zinc industry Adelson D. de Souza a, Pablo S. Pina b, Versiane Albis Lea˜o b,* a Votorantim Metais Zinc – Technologies Development Centre, BR 040, Km 274-Treˆs Marias, MG 39205-000, Brazil b Universidade Federal de Ouro Preto, Department of Metallurgical and Materials Engineering, Nu´cleo de Valorizac¸a˜o de Materiais ...

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Metals | Free Full-Text | Leaching/Bioleaching and ...

Feature Papers represent the most advanced research with significant potential for high impact in the field. Feature Papers are submitted upon individual invitation or recommendation by the scientific editors and undergo peer review prior to publication.

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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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Bioleaching of Zn from sphalerite using Leptospirillum ...

De Souza AD, Pina PS, Leão VA (2007) Bioleaching and chemical leaching as an integrated process in the zinc industry. Miner Eng 20:591–599. Google Scholar 30. Jian-she L, Xue-hui X, Sheng-mu X, Xiu-mei W, Wen-jie Z, Zhuo-li T (2007) Isolation of Leptospirillum ferriphilum by single-layered solid medium. J Cent South Univ Technol 14:468–473

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