Kinetic Study of the Leaching of Low-Grade Manganese Ores by Using Pretreated Sawdust as Reductant

Sun, Yangyang; Fu, Gengtao; Jiang, Lan

doi:10.3390/min7050083

Cited by 18 publications

(6 citation statements)

References 15 publications

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“…If the uranium ore particles are regarded as spherical, the leaching kinetics of uranium ore can be described by the shrink kernel model (SCM). In this model, the uranium dissolution rate can be dependent on the following rate-limiting steps, which is the surface chemical reactions controlled kinetic model (Eq 1) or the internal diffusion through product layer controlled kinetic model (Eq 2) (Abdel-Aal, 2000 ; Sun et al, 2017 ).…”

Section: Resultsmentioning

confidence: 99%

Sulfur enhancement effects for uranium bioleaching in column reactors from a refractory uranium ore

Yang

et al. 2023

Front. Microbiol.

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The feasibility of sulfur enhancement for uranium bioleaching in column reactors was assessed with a designed mixed Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans and Leptospirillum ferriphilum from a refractory uranium ore. The uranium extraction reached 86.2% with the sulfur enhancement (1 g/kg) in 77 days leaching process, increased by 12.6% vs. the control without sulfur addition. The kinetic analysis showed that uranium bioleaching with sulfur enhancement in columns followed an internal diffusion through the product layer-controlled model. Ore residue characteristics indicated that sulfur enhancement could strengthen the porosity of passivation layer, improving the ore permeability. Notably, bacterial community analysis showed that sulfur enhancement at 1 g/kg could make the iron-oxidizing and sulfur-oxidizing bacteria on the ore surface maintain a good balance (approx. 1:1), and thus decomposing ore more effectively. Lastly, a possible mechanism model for uranium bioleaching with sulfur enhancement was proposed.

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Section: Resultsmentioning

confidence: 99%

Sulfur enhancement effects for uranium bioleaching in column reactors from a refractory uranium ore

Yang

et al. 2023

Front. Microbiol.

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“…Based on these mechanisms, the reaction rate may be controlled using the following steps: chemical reactions at the surface or diffusion through the product layer. When the reductive leaching process is controlled by surface chemical reaction, the kinetic equation can be expressed as (Sun et al 2017): When the reductive leaching process is controlled by internal diffusion, the kinetic equation can be expressed as (Sun et al 2017): …”

Section: Resultsmentioning

confidence: 99%

“…When the reductive leaching process is controlled by internal diffusion, the kinetic equation can be expressed as (Sun et al 2017):…”

Section: Kinetic Analysismentioning

confidence: 99%

Comparative investigation of leaching of zinc from wastes of the zinc alloy production process

Koohestani

Khatami

Babaei

2019

Mineral Processing and Extractive Metallurgy

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The main purpose of this study was to recover zinc from the waste obtained from plants manufacturing zinc alloys. Waste leaching in organic and inorganic acids has been studied in this article. It was shown that organic acids like citric acid have a higher efficiency in zinc leaching than inorganic acids. Applying optimum conditions, resulted in about 86% of zinc efficiency from the waste. Finally, thermodynamics and kinetics aspects of the process were also studied. Considering the results showed that the surface chemical reaction is the zinc leaching process controller in this condition.

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“…Reduction leaching is frequently used in the hydrometallurgy of low-grade pyrolusite, which is subsequent with an impurity removal process due to the gangue minerals and the introduction of reductant [2]. First, insoluble manganese is reduced to soluble manganese into the solution by inorganic reducing agents [6,7] or organic reducing agents [8,9]. The most commonly used are Fe(II) reductants such as pyrite, ferrous sulfide, and ferrous sulphate.…”

Section: Introductionmentioning

confidence: 99%

A Green Cyclic Leaching Process for Low-Grade Pyrolusite via a Recyclable Fe(II) Reductant

Wang,

et al. 2023

Minerals

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The low-cost Fe(II) reductants used in the leaching of pyrolusite usually cause high concentrations of iron ions in the leaching solution, which are difficult to treat and recover. Herein, a green cyclic leaching process for pyrolusite with recycling and reusing of Fe(II) reductants was developed. Sodium sulfide was introduced to reduce and precipitate iron ions in the leaching solution. Ep-H diagrams show that Fe3+ can be reduced to Fe2+ by S2− and form a precipitate with the high efficiency of 93.09%. Since the main component of the precipitate was ferrous disulfide with reducibility, it was used as a reducing agent for low-grade manganese oxide ores. A total of 97.96% of the manganese was highly reductively leached by the obtained precipitate of 0.28 g·g−1 ore. Furthermore, the leaching efficiency was almost unchanged after five iterations of cyclic experiments. The cyclic leaching process enables the efficient leaching of manganese and the recycling of iron, which provides a green and economic method for the efficient utilization of low-grade pyrolusite resources.

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Kinetic Study of the Leaching of Low-Grade Manganese Ores by Using Pretreated Sawdust as Reductant

Cited by 18 publications

References 15 publications

Sulfur enhancement effects for uranium bioleaching in column reactors from a refractory uranium ore

Sulfur enhancement effects for uranium bioleaching in column reactors from a refractory uranium ore

Comparative investigation of leaching of zinc from wastes of the zinc alloy production process

A Green Cyclic Leaching Process for Low-Grade Pyrolusite via a Recyclable Fe(II) Reductant

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