kinetic leaching sphalerite

Leaching Kinetic of Sphalerite Concentrate

Table of ContentsOperationResult and DiscussionLeaching kinetic of original concentrateLeaching kinetic of the activated concentrate During roast, virtually all the iron in the concentrate feed is converted into zinc ferrite which remains almost inert in the neutral-leach stage. In order to recover zinc incorporated in ZnO·Fe2O3, a follow-up treatment of the leach residue is required. Ferric ...

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KINETICS AND MECHANISM OF SPHALERITE LEACHING BY

leaching kinetics of the silicate concentrate by sulphuric acid. Ferric and cupric ions, bacteria, oxygen, and other oxidants have been used as leaching agents of sphalerite in sulphate and chloride media under atmospheric or pressure leaching conditions. Ferric ion, in either sulphate or chloride media, can be used to leach sphalerite,

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(PDF) Kinetics and mechanism of sphalerite leaching by ...

Kinetic results showed that there were two stages in the sphalerite leaching. At the beginning of the leaching process, kinetics of sphalerite leaching is fast, while after about an hour the ...

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(PDF) Kinetics of leaching of zinc from sphalerite ...

Kinetic results showed that there were two stages in the sphalerite leaching. At the beginning of the leaching process, kinetics of sphalerite leaching is fast, while after about an hour the ...

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Leaching and kinetic modelling of low-grade calcareous ...

May 01, 2009 · The leaching kinetics of a low grade-calcareous sphalerite concentrate containing 38% ankerite and assaying 32% Zn, 7% Pb and 2.2% Fe was studied in HCl–FeCl 3 solution. An L 16 (five factors in four levels) standard orthogonal array was employed to evaluate the effect of Fe(III) and HCl concentration, reaction temperature, solid-to-liquid ratio and particle size on the reaction rate of ...

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Kinetics of indium dissolution from sphalerite concentrate ...

Dec 01, 2010 · The leaching kinetics of indium from a sphalerite concentrate was investigated by pressure oxygen leaching in sulphuric acid. It was found that the temperature, sulphuric acid concentration and particle size had a pronounced influence on indium dissolution, with increasing the temperature and sulphuric acid concentration the indium leaching ...

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Kinetic Study on Catalytic Leaching of Sphalerite ...

Nov 24, 2012 · This paper examines the influence of cobalt and silver ion concentration on the extraction and kinetics of zinc dissolution from sphalerite. The mechanism involves catalysis of a galvanic oxidation! reduction that produces elemental sulfur in place of SO2 gas. A 95% maximum zinc recovery was achieved under the experimental conditions. The apparent activation energy suggested a

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Kinetic study of sulfide leaching by galvanic interaction ...

Kinetic study of sulfide leaching by galvanic interaction between chalcopyrite, pyrite, and sphalerite in the presence of T. ferrooxidans(30°C) and a thermophilic microorganism (55°C) A. P. Mehta Department of Metallurgical and Materials Engineering, New Mexico Institute of Mining and Technology, Socorro

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(PDF) Bioleaching of Zn from sphalerite using ...

Bioleaching of Zn from sphalerite using Leptospirillum ferriphilum isolate: effect of temperature and kinetic aspects December 2020 Applied Biological Chemistry 63(1)

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(PDF) Effect of FE (II) Concentration on Bioleaching of ...

Effect of FE (II) Concentration on Bioleaching of Zinc from Sphalerite using Leptospirillum Ferriphilum: Kinetic Aspects October 2019 DOI: 10.35940/ijeat.A1276.109119

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Kinetics Etude of the Experimental Leaching of Sphalerite ...

How to cite this article: Elbar D, Barkat D. Kinetics Etude of the Experimental Leaching of Sphalerite Using Acidic Lixiviant. Aspects Min Miner Sci. 1(4). AMMS.000517.2018. DOI: 10.31031/AMMS.2018.01.000517 Volume ssue The subsequent leaching was performed in the optimized acid concentrations at temperatures of (298, 318, 338 and 358K) for

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Kinetic Study on Catalytic Leaching of Sphalerite ...

Nov 24, 2012 · This paper examines the influence of cobalt and silver ion concentration on the extraction and kinetics of zinc dissolution from sphalerite. The mechanism involves catalysis of a galvanic oxidation! reduction that produces elemental sulfur in place of SO2 gas. A 95% maximum zinc recovery was achieved under the experimental conditions. The apparent activation energy suggested a

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Kinetics of indium dissolution from sphalerite concentrate ...

Dec 01, 2010 · The leaching kinetics of indium from a sphalerite concentrate was investigated by pressure oxygen leaching in sulphuric acid. It was found that the temperature, sulphuric acid concentration and particle size had a pronounced influence on indium dissolution, with increasing the temperature and sulphuric acid concentration the indium leaching ...

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Kinetic Analysis of Isothermal Leaching of Zinc from Zinc ...

Sphalerite, a zinc sulfide ore is considered as the main and primary source to produce zinc metal. Oxidative leaching is one of the major processes applied for the zinc recovery from sphalerite and many researchers have investigated its kinetic analyses [2-8]. Extensive investigations have

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Leaching and kinetic modelling of low-grade calcareous ...

May 01, 2009 · The leaching kinetics of a low grade-calcareous sphalerite concentrate containing 38% ankerite and assaying 32% Zn, 7% Pb and 2.2% Fe was studied in HCl–FeCl 3 solution. An L 16 (five factors in four levels) standard orthogonal array was employed to evaluate the effect of Fe(III) and HCl concentration, reaction temperature, solid-to-liquid ratio and particle size on the reaction rate of ...

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Kinetics of sphalerite leaching by sodium nitrate in ...

Keywords: Sulfide Ores, Leaching, Reaction Kinetics, Modeling. 1. Introduction Sphalerite is the chief zinc ore, and is usually associated with galena, pyrite, and other sulfides along with calcite, dolomite, and fluorite. Froth flotation is a process for selectively separating the hydrophobic minerals from the hydrophilic ones [1].

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Ferric leaching of the sphalerite contained in a bulk ...

Aug 15, 2018 · Kinetic equations shown in Table 1 are fit to experimental data of different tests with the aim of confirming the kinetic model that estimates better the sphalerite leaching. The interpretation of kinetic models is discussed more fully in Dickinson and Heal, 1999, Orfao and Martins, 2002, Levenspiel, 2004, Khawam and Flanagan, 2006.

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Kinetic study of sulfide leaching by galvanic interaction ...

1. Biotechnol Bioeng. 1982 Apr;24(4):919-40. Kinetic study of sulfide leaching by galvanic interaction between chalcopyrite, pyrite, and sphalerite in the presence of T. ferrooxidans (30 degrees C) and a thermophilic microorganism (55 degrees C).

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(PDF) Bioleaching of Zn from sphalerite using ...

Bioleaching of Zn from sphalerite using Leptospirillum ferriphilum isolate: effect of temperature and kinetic aspects December 2020 Applied Biological Chemistry 63(1)

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A kinetic study on the pressure leaching of sphalerite ...

The dissolution of sphalerite (ZnS) in sulfuric acid solution under oxygen pressure was investigated. Effects of temperature, percent solids, agitation, sample size, oxygen partial pressure and foreign ions were evaluated. The effect of hydrogen pretreatment on sphalerite leaching rate was also examined. Leaching of sphalerite at 90°C and 150 psi oxygen pressure was found to occur at a ...

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[PDF] KINETICS OF SPHALERITE LEACHING BY SODIUM NITRATE

In the present work, the extraction of zinc from a sphalerite concentrate using sodium nitrate as an oxidant in a sulfuric acid solution was investigated. The effective parameters such as the temperature, sulfuric acid and sodium nitrite concentrations, stirring speed, particle size, and solid/liquid (S/L) ratio were analyzed. The dissolution rate increased with increase in the sulfuric acid ...

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Ferric leaching of the sphalerite contained in a bulk ...

Ferric leaching of ZnS from a Cu-Zn-Pb concentrate is studied. • Two kinetics regimes for sphalerite leaching with ferric sulphate are proposed. • A non-porous film of S 0 hinders the mass transfer to ZnS surface. • The behaviour of ZnS in a bulk concentrate is similar to the rest of studies. •

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KINETICS OF THE LEACHING OF SPHALERITE IN ACIDIC

3.9 Leaching of sphalerite in the presence of oxygen 49. 3.10 Leaching of sphalerite in the presence of oxygen. 50. 4.1 Diffusion through product layer plot for runs 39, 40, and 42. 54. 4.2 Diffusion through product layer plot, indicatingthe effect of an increase in Fo(II), Fe(III) concentration, and agitation. 56.

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A kinetic study on nonoxidative dissolution of sphalerite ...

The nonoxidative leaching of sphalerite in aqueous acidic solutions was studied from a kinetic point of view. Also the selective nonoxidation leaching in a hydrochloric acid solution containing a large amount of sodium chloride was examined for a Pb-Zn sulfide bulk concentrate. The dissolution rates of sphalerites from five different mines appeared to be controlled by a chemical reaction on ...

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Kinetic Study on Catalytic Leaching of Sphalerite ...

Nov 24, 2012 · This paper examines the influence of cobalt and silver ion concentration on the extraction and kinetics of zinc dissolution from sphalerite. The mechanism involves catalysis of a galvanic oxidation! reduction that produces elemental sulfur in place of SO2 gas. A 95% maximum zinc recovery was achieved under the experimental conditions. The apparent activation energy suggested a

Read More+

Kinetic Analysis of Isothermal Leaching of Zinc from Zinc ...

Sphalerite, a zinc sulfide ore is considered as the main and primary source to produce zinc metal. Oxidative leaching is one of the major processes applied for the zinc recovery from sphalerite and many researchers have investigated its kinetic analyses [2-8]. Extensive investigations have

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A kinetic study on the pressure leaching of sphalerite ...

The dissolution of sphalerite (ZnS) in sulfuric acid solution under oxygen pressure was investigated. Effects of temperature, percent solids, agitation, sample size, oxygen partial pressure and foreign ions were evaluated. The effect of hydrogen pretreatment on sphalerite leaching rate was also examined. Leaching of sphalerite at 90°C and 150 psi oxygen pressure was found to occur at a ...

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Leaching of Sphalerite with Hydrogen Peroxide and Nitric

Figure 4 shows that the rate of leaching is inversely proportional to ore particle size; this is due to large surface area as the particle size is reduced. The effect of stirring speed on the leaching of sphalerite shown in figure 5 shows that the leaching rate is dependent on the speed of agitation. Kinetic Analysis

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A kinetic study on nonoxidative dissolution of sphalerite ...

The nonoxidative leaching of sphalerite in aqueous acidic solutions was studied from a kinetic point of view. Also the selective nonoxidation leaching in a hydrochloric acid solution containing a large amount of sodium chloride was examined for a Pb-Zn sulfide bulk concentrate. The dissolution rates of sphalerites from five different mines appeared to be controlled by a chemical reaction on ...

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DOISerbia - Kinetics and mechanism of sphalerite leaching ...

The selected kinetic model indicated that the diffusion through the product layer was the rate-controlling step during the sphalerite leaching. The activation energy was determined to be 55 kJ/mol in the temperature range 60-90°C.

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Kinetics of Simultaneous Dissolution of Zinc and Manganese ...

The kinetic data of leaching for both manganese and zinc were found to follow the chemical reaction controlled process, i..e., where, τ = time for complete disappearance of particles and X = fraction of reacted particles. Activation energy of manganese and zinc were found to be 46.27 KJ/mol and 52.39 KJ/mol respectively; which again justified ...

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Modeling the kinetics of the zinc pressure leaching ...

In the field of hydrometallurgy, the industrial uptake of leaching models has been overlooked partially due to the lack of universal models. A model developed for one plant cannot easily be transferred for the application of a different plant without redesigning the leaching kinetics in the code. The Multiple Convolution Integral (MCI)-based model developed in this thesis has the ability to be ...

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Modeling the kinetics of the zinc pressure leaching ...

DOI: 10.14288/1.0357247 Corpus ID: 103945122. Modeling the kinetics of the zinc pressure leaching process - oxidative sphalerite leaching in sulphuric acid media @inproceedings{Dyson2017ModelingTK, title={Modeling the kinetics of the zinc pressure leaching process - oxidative sphalerite leaching in sulphuric acid media}, author={D. Dyson}, year={2017} }

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Kinetic models of zinc dissolution from artificial ...

Kinetic models of zinc dissolution from artificial sphalerite with different iron contents in oxygen pressure leaching. The oxygen pressure leaching of sphalerite in sulphuric acid solutions is a slow process in the absence of iron because of the limitations of

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Reaction kinetics of the ferric chloride leaching of ...

A kinetic model for the ferric chloride leaching of sphalerite was also obtained for the lower Fe 3+ concentrations and is given by: (ie5-01) This model is in excellent agreement with the experimental results for fractions of zinc extracted up to 0.95.

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Kinetics of corrosion of metals | Journal of Chemical ...

It is the purpose of this paper to report that all corrosion processes that produce no insoluble end products and evolve hydrogen follow a single kinetic law.

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Leaching of Zinc Sulfide by Thiobacillus ferrooxidans ...

The role of Thiobacillus ferrooxidans in bacterial leaching of mineral sulfides is controversial. Much of the controversy is due to the fact that the solution conditions, especially the concentrations of ferric and ferrous ions, change during experiments. The role of the bacteria would be more easily discernible if the concentrations of ferric and ferrous ions were maintained at set values ...

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Kinetics of indium dissolution from marmatite with high ...

Jun 29, 2016 · The kinetics of oxygen pressure acid leaching marmatite with high indium content was studied. The effects of particle size, agitation rate, temperature, H2SO4 concentration, and oxygen partial pressure on leaching rate of indium were investigated. The results show that when the agitation rate is above 600 r·min−1, its influence on indium leaching rate is insignificant.

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