Effect of activator on kinetics of direct acid leaching of vanadium from clay vanadium ore

Chen, Ziyang; Ye, Guohua; Xiang, Peng; Tao, Yuanyuan; Tang, Yue; Hu, Yujie

doi:10.1016/j.seppur.2021.119937

Cited by 17 publications

(7 citation statements)

References 19 publications

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“…The apparent activation energy of the reaction obtained by the linear slope in Figures 12 and 13 According to the Arrhenius equation and activation energy value in the range of activation energy controlled by chemical reaction, it can be observed that both the nonactivated acid leaching process and activated acid leaching process are controlled by chemical reaction [20]. The apparent activation energy of the reaction obtained by the linear slope in Figures 12 and 13 According to the Arrhenius equation and activation energy value in the range of activation energy controlled by chemical reaction, it can be observed that both the non-activated acid leaching process and activated acid leaching process are controlled by chemica reaction [20]. The apparent activation energy of the reaction obtained by the linear slope in Figures 12 and 13 The results show that activated acid leaching does not change the control step of the leaching process, but greatly reduces the activation energy of the reaction.…”

Section: Effect Of Temperature On Activation Energy Of Reactionmentioning

confidence: 98%

“…According to the Arrhenius equation and activation energy value in the range of activation energy controlled by chemical reaction, it can be observed that both the non-activated acid leaching process and activated acid leaching process are controlled by chemical reaction [20]. The apparent activation energy of the reaction obtained by the linear slope in Figures 12 and 13 According to the Arrhenius equation and activation energy value in the range of activation energy controlled by chemical reaction, it can be observed that both the nonactivated acid leaching process and activated acid leaching process are controlled by chemical reaction [20]. The apparent activation energy of the reaction obtained by the linear slope in Figures 12 and 13 According to the Arrhenius equation and activation energy value in the range of activation energy controlled by chemical reaction, it can be observed that both the non-activated acid leaching process and activated acid leaching process are controlled by chemica reaction [20].…”

Section: Effect Of Temperature On Activation Energy Of Reactionmentioning

confidence: 99%

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Effect of Fluoride Ions on the Surface Dissolution of Vanadium-Bearing Biotite

Tao

Zhang

et al. 2022

Separations

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In shale vanadium ore, vanadium is mainly formed as a low-V(III) homogeneous phase to partially replace Si and exists in the lattice structure of aluminosilicate minerals such as biotite. During the acid leaching of shale vanadium ore, an activator is needed to effectively extract vanadium. Using biotite as a tetrahedral structure doped with Aluminum-Silicon tetrahedron structure, the interaction between leaching-agent ions (H+), activator ions (F−), and vanadium-containing biotite surface was discussed by DFT quantum chemical calculations. The dissolution behavior of activator fluoride ions on the surface of vanadium-bearing biotite during sulfuric acid leaching was revealed. According to the simulated leaching results, the oxygen on the biotite surface first absorbed hydrogen ions to undergo complete hydroxylation, and then combined with hydrogen ions to form water molecules. However, in the presence of activator (NaF), fluoride ions were adsorbed on the surface cations, which catalyzed the formation of water molecules and promoted the dissolution of surface cations. SEM–EDS analysis showed that the surface of vanadium-bearing minerals became very irregular, and the number of voids and cracks greatly increased. At the same time, XPS showed that the addition of activator fluoride ions destroyed the Al-O tetrahedron structure. Many Al and V atoms dissolved in the solution, which improved the leaching rate of vanadium.

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Section: Effect Of Temperature On Activation Energy Of Reactionmentioning

confidence: 98%

Section: Effect Of Temperature On Activation Energy Of Reactionmentioning

confidence: 99%

Effect of Fluoride Ions on the Surface Dissolution of Vanadium-Bearing Biotite

Tao

Zhang

et al. 2022

Separations

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“…For the case of a spherical solid-particle reactant, the kinetic model for the process controlled by an interfacial chemical reaction was deduced as Equation ( 2) [17][18][19][20][21][22][23].…”

Section: Effect Of Temperature On the Leaching Kineticsmentioning

confidence: 99%

“…If the process is controlled by the inner diffusion step, the corresponding kinetic model can be expressed as Equation (3) [17][18][19][20][21][22][23].…”

Section: Effect Of Temperature On the Leaching Kineticsmentioning

confidence: 99%

Hydrothermal Leaching Kinetics of Vanadium from an Iron Vanadate Mineral Using Oxalic Acid

Shen,

Chen,

Yan

2023

Metals

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Hydrothermal leaching vanadium using oxalic acid is a novel method reported recently to overcome the serious environmental problems caused by traditional extracting processes. In view of its promising application potential, the hydrothermal leaching kinetics of vanadium from a concentrate mainly composed of Fe3−xVxO4 mineral via oxalic acid were investigated in this study. Firstly, the effects of the temperature and concentration of oxalic acid on the leaching behavior of vanadium were studied by measuring the leaching efficiency of vanadium at various times. Then, by fitting the measured leaching efficiency data to the proposed kinetic model, the leaching mechanism was analyzed and the rate-controlling step of the leaching process, the apparent activation energy, and the order of the chemical reactions were determined. Finally, a kinetic model was proposed to describe the present investigated leaching process. Detailed results are as follows: (1) an interfacial chemical reaction was the rate-controlling step of the present hydrothermal leaching process within temperatures ranging from 363 to 403 K, and the leaching efficiency was less than 85%; (2) the apparent activation energy of the interfacial chemical reaction was 45.6 kJ/mol; (3) the order of the interfacial chemical reaction to the concentration of oxalic acid was around 1.66.

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“…Vanadium-bearing shale is a unique strategic advantageous resource to produce vanadium products. Recovering and extracting the valuable metal of vanadium from vanadium-bearing shale has significant economic benefits and social value [ 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Vanadium Extraction from the Flotation Concentrate of Vanadium-Bearing Shale by Process of Non-Roasting Enhanced Acid Leaching and Thermodynamics

Tang

Zuo

2023

Molecules

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The purpose of this work is to significantly improve the vanadium grade of vanadium-bearing shale after flotation preconcentration, which is conducive to reducing the acid consumption and industrial costs in the subsequently enhanced acid leaching of vanadium. Vanadium concentrate from vanadium-bearing shale enriched by flotation is used for acid-leaching feed. The leaching effects of two kinds of acid-leaching systems were compared, and the mechanism of acid leaching on the mineral structure was also described. The difficulty of spontaneous reactions of vanadium-bearing minerals such as garnet in an acid-leaching system was studied through thermodynamics. Additionally, several characterization methods were used to evaluate the improvement of leaching performance. The addition of oxidants and fluorinating aids strengthens the acid-leaching process, which greatly destroys the structure of a garnet, which is conducive to the extraction of vanadium in a flotation concentrate. The leaching efficiency can reach 94.86%, and the acid consumption is also reduced. Through the mechanism study of the leaching system, it is expected that when the enhanced acid-leaching process is put into industrial production, the effective leaching of vanadium can be accurately controlled, and the difficulty of subsequent vanadium enrichment and purification can be reduced.

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Effect of activator on kinetics of direct acid leaching of vanadium from clay vanadium ore

Cited by 17 publications

References 19 publications

Effect of Fluoride Ions on the Surface Dissolution of Vanadium-Bearing Biotite

Effect of Fluoride Ions on the Surface Dissolution of Vanadium-Bearing Biotite

Hydrothermal Leaching Kinetics of Vanadium from an Iron Vanadate Mineral Using Oxalic Acid

Vanadium Extraction from the Flotation Concentrate of Vanadium-Bearing Shale by Process of Non-Roasting Enhanced Acid Leaching and Thermodynamics

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