Hydrogen reduction behaviors and mechanisms of vanadium titanomagnetite ore under fluidized bed conditions

Ou, Yang; Sun, Yongsheng; Yu, Jianwen; Li, Yanjun; Han, Yuexin

doi:10.1016/j.powtec.2022.117340

Cited by 9 publications

(3 citation statements)

References 36 publications

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“…Figure b illustrates that the increase in oxygen content acted as another effective way to increase the rate of thiosulfate production. The above phenomenon reveals that the increase in the number of O 2 molecules per unit volume in the oxidation system leads to more O 2 molecules being chemisorbed to the active sites on the surface of monoclinic pyrrhotite . Simultaneously, the contact area between oxygen molecules and solid particles at the chemical reaction interface increases, enhancing oxidation and accelerating the rate of thiosulfate production.…”

Section: Results and Discussionmentioning

confidence: 94%

“…The above phenomenon reveals that the increase in the number of O 2 molecules per unit volume in the oxidation system leads to more O 2 molecules being chemisorbed to the active sites on the surface of monoclinic pyrrhotite. 18 Simultaneously, the contact area between oxygen molecules and solid particles at the chemical reaction interface increases, enhancing oxidation and accelerating the rate of thiosulfate production. Therefore, a suitable oxygen content of 100% (O 2 /(O 2 + N 2 ) = 100%) was recommended.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Process Mechanism for Production of Green Lixiviant Thiosulfate at Atmospheric Pressure

Yang

Wang

et al. 2023

ACS Sustainable Chem. Eng.

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The serious environmental pollution and human health risks caused by highly toxic cyanide have necessitated the search for a nontoxic and alternative lixiviant. However, conventional chemical thiosulfate suffers from high consumption, which makes the commercialization of non-cyanide green extraction of precious metals difficult. Therefore, the development of green and low-energy technology for producing thiosulfate from sulfur-containing materials is of high academic and industrial interest. Herein, the process mechanism of producing thiosulfate at atmospheric pressure was first elucidated to facilitate the production of sufficient thiosulfate. By precisely regulating significant parameters, the concentration of thiosulfate can be increased to up to 0.32 M under optimal conditions. Furthermore, the conversion characteristics of sulfur and iron in this process are as follows:and Fe(II)−S 2 → Fe(II)−S → Fe(II)−O/S n → Fe(III)−O/OH and Fe(III)−SO 3 /SO 4 . Importantly, the sustainable existence of metastable thiosulfate is achieved under the oxidation system designed, preventing the peroxidation of S 2 O 3 2− into S 4 O 6 2− and S 3 O 6 2−. This fruitful research provides valuable scientific insights for promoting the commercial application of thiosulfate with lower cost and environmental impact in the precious metal extraction industry.

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Section: Results and Discussionmentioning

confidence: 94%

Section: ■ Results and Discussionmentioning

confidence: 99%

Process Mechanism for Production of Green Lixiviant Thiosulfate at Atmospheric Pressure

Yang

Wang

et al. 2023

ACS Sustainable Chem. Eng.

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“…In other words, the adverse effects of elevated temperature can be mitigated by adjusting the solution properties (pH and solution potential), as shown in eqs – . Importantly, the main purpose of the temperature increase is to enhance the average kinetics energy of O 2 molecules and free hydroxide ions (OH – ) in the system, thereby promoting their effective collision probability with the pyrrhotite surface active sites . This greatly accelerates the rate of the oxidation reaction, consistent with the experimental results presented in Figure c. …”

Section: Resultsmentioning

confidence: 99%

Eco-Friendly and Low-Energy Innovative Scheme for Green Gold Extraction: Thermodynamics, Kinetics, and Application of Self-Generating Thiosulfate at Atmospheric Pressure

Ou,

Yang,

Wang

et al. 2024

ACS Sustainable Chem. Eng.

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The self-generation of thiosulfate from sulfurbearing minerals at atmospheric pressure can address its high consumption bottleneck. However, the stability factors, generation model of thiosulfate, and its systematic application in gold extraction are still elusive. Herein, it was elucidated that the adverse effects of temperature elevation on shortening the thermodynamic stability range of thiosulfate can be overcome by increasing the alkalinity of the solution. And the generation kinetics fitting results indicate that the oxidation process conforms to a shrinking core model under the control of surface chemical reactions (E a = 40.67 kJ/mol), which contributed to the precise regulation of the thiosulfate generation process. Further, a gold extraction rate of 86.02% was obtained by utilizing self-generated thiosulfate, and copper and gold were efficiently recovered from the desorbed pregnant solution (the desorption rates of copper and gold were 99.41% and 98.63%, respectively), demonstrating that self-generated thiosulfate can completely replace conventional chemically pure thiosulfate. This successful research has perfected the theoretical and technical framework for self-generating thiosulfate from sulfur-containing minerals, providing valuable insights and technical support for successfully applying this technology in refractory sulfide gold ore resources.

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Enhancing Reduction Separation and Efficient Recovery of Iron, Vanadium, and Titanium for Ultra-High-Titanium Magnetite

Cheng,

Han,

Song

et al. 2023

Metall Mater Trans B

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Hydrogen reduction behaviors and mechanisms of vanadium titanomagnetite ore under fluidized bed conditions

Cited by 9 publications

References 36 publications

Process Mechanism for Production of Green Lixiviant Thiosulfate at Atmospheric Pressure

Process Mechanism for Production of Green Lixiviant Thiosulfate at Atmospheric Pressure

Eco-Friendly and Low-Energy Innovative Scheme for Green Gold Extraction: Thermodynamics, Kinetics, and Application of Self-Generating Thiosulfate at Atmospheric Pressure

Enhancing Reduction Separation and Efficient Recovery of Iron, Vanadium, and Titanium for Ultra-High-Titanium Magnetite

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