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direct and indirect leaching in mining

Direct versus indirect bioleaching ScienceDirect

2001. 2. 1.· Contact leaching as redefined “direct” leaching In two discussed cases (Fig. 3d,e),the bacteria cannot rely on a stone species as available in the natural environment but have to produce an energy carrier (Y + ) or have to increase artificially the concentration of an electron extracting agent (Fe 3+ ) close to the pyrite surface.
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Direct versus indirect bioleaching ResearchGate

2001. 2. 1.· In addition, leaching can be direct (i.e., physical contact between microorganisms and solid material) or indirect (e.g., bacterial oxidation of Fe 2+ to Fe 3+ which catalyses metal solubilisation
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Bioleaching Definition & Process Anglo American

2019. 7. 11.· Indirect Bioleaching. Direct bioleaching uses minerals that are easily receptive to oxidation to create a direct enzymatic strike using the microorganisms to separate the metal and the ore. In indirect bioleaching, microorganisms are not in direct contact with minerals during the process. However, leaching agents are created by microbes, which
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Direct versus indirect bioleaching ScienceDirect

Nevertheless, they cannot be called ‘direct’ because the definition would require an enzymatic interaction between the bacterial membrane and the cell. Therefore, the term ‘contact’ leaching is proposed for this situation. In practice, multiple patterns of bacterial leaching coexist, including indirect leaching,
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Bioleaching: Extraction of Metals by Microorganisms

2020. 8. 30.· INDIRECT LEACHING (Non-contact leaching) In this type of biomining, there is no need of microbial attachment on the metal surface and the electrons are not gained by the metals directly from microbes, but the reduced
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Direct versus indirect bioleaching ScienceDirect

1999. 1. 1.· Direct versus indirect Bioleaching H. Tributsch Hahn-Meitner Institut, Dept. Solare Energetik, 14109 Berlin, Germany The dissolution of metal sulfides is controlled by their solubility product and thus the [H § concentration of the solution and further enhanced by several stone mechanisms which lead to a disruption of sulfide stone bonds.
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The Indirect Mechanism of Bacterial Leaching: Mineral

2018. 6. 7.· The indirect mechanism of bacterial leaching, which is a combination of these two sub-processes, is able to account for the shape of the reaction curve obtained from bacterial leaching experiments. It is also shown that even at very low concentrations of iron in solution the indirect mechanism may be the dominant pathway in bacterial leaching or sulphidic minerals.
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Direct Eluate & Indirect Heaters 911Metallurgist

2020. 8. 12.· Direct Eluate & Indirect Heaters Our systems of direct eluate and indirect thermal oil heaters are manufactured to a high quality specification. Customisable to satisfy our customers’ needs in both the gold mining industries and other industrial heating applications, they permit both direct fluid heating or indirect
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Recovery of light rare earth elements by leaching and

The leaching study of LREEs by H 2 SO 4 from the mining waste was conducted by varying the concentration of acid from 0.5 to 3 M in order to choose the optimal conditions for the dissolution process. It has been observed that increasing the concentration gives a rise to the leaching of all LREEs and a plateau region is reached above a concentration of 2 M.
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Atmospheric oxygen-rich direct leaching behavior of zinc sulphide

2013. 12. 31.· 2. Beijing General Research Institute of Mining and Metallurgy, Beijing 100160, China Received 17 October 2012; accepted 14 October 2013 Abstract: The leaching behavior of main metallic sulphides in zinc concentrate under atmospheric oxygen-rich direct leaching conditions was studied through mineralogical analysis.
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Atmospheric oxygen-rich direct leaching behavior of zinc

2013. 12. 31.· 2. Beijing General Research Institute of Mining and Metallurgy, Beijing 100160, China Received 17 October 2012; accepted 14 October 2013 Abstract: The leaching behavior of main metallic sulphides in zinc concentrate under atmospheric oxygen-rich direct leaching conditions was studied through mineralogical analysis.
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Bioleaching BioMineWiki

2009. 8. 31.· Direct bioleaching. The microbes are kept together with the valuable metal-bearing material Indirect bioleaching. The microbes are kept in a pond external to the valuable metal-bearing material and provide the leaching
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Direct and indirect mechanisms in the bacterial leaching

Bacterial leachings of sample of covellite using a strain of Thiobacillus ferrooxidans in 9 K medium with and without iron were made at several pulp densities. Rates of solubilization with and without iron correspond to total and to direct mechanism respectively. Orders of reaction (at each pulp density) for each mechanism at two temperatures were calculated.
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Nitrate leaching, direct and indirect nitrous oxide fluxes

2012. 3. 1.· Nitrate leaching, direct and indirect nitrous oxide fluxes from sloping cropland in the purple soil area, southwestern China. Author links open overlay panel Minghua Zhou a b Bo Zhu a Klaus Butterbach-Bahl b Tao Wang a Jessica Bergmann b Nicolas Brüggemann c Zhenhua Wang a Taikui Li a Fuhong Kuang a. Show more.
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What is Difference Between Direct And Indirect Income

In this article, we will talk about finance terms “Direct and indirect income” and see direct and indirect income list examples. Introduction. The main aim of starting a business is to make profits. Profits are classified under the broader category of revenues or incomes.
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(PDF) Direct Leaching Alternatives for Zinc Concentrates

development of direct pressure direct leaching of zinc concentrates in the mid-1950s [5] with batch autoclave tests. The first pressure leach ing tests done at 140°C showed that the zinc
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Leaching of Zinc Sulfide by Thiobacillus ferrooxidans:

In the case of zinc sulfide, the direct mechanism may be represented as follows : ZnS + 2 H + + 0.5 O 2 → bacteria Zn 2 + + H 2 O + S A distinction between the two mechanisms is often made on the basis of the role of iron in bacterial leaching. In the indirect mechanism, the presence of dissolved iron is critical, whereas the presence of
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Direct Leaching of sulfides: Chemistry and applications

The sulfide minerals associated with copper, nickel, zinc, lead, and molybdenum concentrates are described according to their thermodynamic stability zones on Eh-pH diagrams. From these zones, the chemistry associated with various thermodynamically feasible decomposition paths is discussed, and process developments associated with the most favorable decomposition paths are briefly reviewed.
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GOLD RECOVERY OF REFRACTORY SULFIDE

Cyanide leaching of the concentrate was performed at 20%-w/w of solid (500 gram of refractory sulfide gold ore concentrate) in a 2.5-liter glass reactor with aeration and stirred at 250 rpm. Leach solutions were prepared using deionized-distilled water at the prescribed concentration of reagents.
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Microbial Leaching (Bioleaching, Biomining)

Indirect Bacterial Leaching In indirect bacterial leaching microbes are not in direct contact with minerals but leaching agents are produced by microorganisms which oxidize them. FeS 2 + Fe 2 (SO 4) 3FeSO 4 + 2S° 2S° + 3O 2 + 2H 2 O 2H 2 SO 4 Oxidation of ferrus (Fe 2+) to ferric (Fe 3+) by T. ferrooxidans at low pH is given below:
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Our Products

Crawler type Mobile Crushing Plant

Secondary Cone Crusher + Screen

HJ Series High Efficiency Jaw Crusher

HPT Cone Crusher

European Type Coarse Powder Mill

T130X Superfine Grinding Mill

direct and indirect leaching in mining

Direct versus indirect bioleaching ScienceDirect

Direct versus indirect bioleaching ResearchGate

Bioleaching Definition & Process Anglo American

Direct versus indirect bioleaching ScienceDirect

Bioleaching: Extraction of Metals by Microorganisms

Direct versus indirect bioleaching ScienceDirect

The Indirect Mechanism of Bacterial Leaching: Mineral

Direct Eluate & Indirect Heaters 911Metallurgist

Recovery of light rare earth elements by leaching and

Atmospheric oxygen-rich direct leaching behavior of zinc sulphide

Atmospheric oxygen-rich direct leaching behavior of zinc

Bioleaching BioMineWiki

Direct and indirect mechanisms in the bacterial leaching

Nitrate leaching, direct and indirect nitrous oxide fluxes

What is Difference Between Direct And Indirect Income

(PDF) Direct Leaching Alternatives for Zinc Concentrates

Leaching of Zinc Sulfide by Thiobacillus ferrooxidans:

Direct Leaching of sulfides: Chemistry and applications

GOLD RECOVERY OF REFRACTORY SULFIDE

Microbial Leaching (Bioleaching, Biomining)

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