Enhanced leaching of vanadium slag in acidic solution by electro-oxidation

Liu, Zuohua; Li, Yan; Chen, Manli; Du, Jun; Fan, Xing; Tao, Changyuan

doi:10.1016/j.hydromet.2015.09.019

Cited by 65 publications

(12 citation statements)

References 12 publications

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“…Therefore, it is necessary to improve the quality of vanadium-containing slags and reduce the contents of other oxides beforehand to improve vanadium leaching and yield rates and reduce the amounts of sodium salt and waste discharged. [12][13][14][15] Thus, the improvement of vanadium-containing slags during vanadium extraction processes in converters has been well studied; however, only limited improvements have been obtained. [2][3][4][5][6] In addition, the quality of the vanadiumcontaining slags is largely determined by the proportion and grain size of the vanadium-containing spinels (V-spinels).…”

Section: Crystallization Behavior and Growth Mechanisms Of Spinel Crymentioning

confidence: 99%

Crystallization Behavior and Growth Mechanisms of Spinel Crystals in Vanadium-Containing Slags

Huang

Liu

2020

ISIJ Int.

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Section: Crystallization Behavior and Growth Mechanisms Of Spinel Crymentioning

confidence: 99%

Crystallization Behavior and Growth Mechanisms of Spinel Crystals in Vanadium-Containing Slags

Huang

Liu

2020

ISIJ Int.

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“…The recovery of vanadium depends strongly on roasting parameters, such as CaO/V 2 O 5 ratio, calcination temperature, heating rate, and roasting time, as well as leaching conditions, such as particle size, solid/liquid ratio, leaching temperature, acid concentration, and stirring rate. It was reported that the recovery of vanadium also can be improved by using methods such as microwave roasting, mechanical activation pretreatment, multistage leaching, electro‐oxidation leaching, liquid oxidation technology, and leaching with additives (CaF 2 , HF, NaClO) …”

Section: Introductionmentioning

confidence: 99%

Dissolution kinetics of calcium vanadates in sulfuric acid: a fundamental study for the vanadium extraction process

Huang

Xiang

Wang

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: The dissolution behavior of calcium vanadates is vital for the vanadium extraction process, as well as the utilization of calcium vanadates based function materials. Therefore, the dissolution kinetics study of calcium vanadates (CaV 2 O 6 , Ca 2 V 2 O 7 , and Ca 3 V 2 O 8 ) in sulfuric acid are presented. The effects of stirring speed, solid/liquid ratio, pH, and temperature on the dissolution rate of calcium vanadates were determined. The mineralogical and microstructure of the residue after dissolution are also performed. RESULTS:The results showed that the dissolution rate of calcium vanadates significantly increased with the increase of temperature from 30 to 70°C. Under the conditions with solid/liquid ratio of 1:150 g mL −1 , temperature range of 30 to 70°C, and pH of 4, the rate of Ca 3 V 2 O 8 dissolution is the fastest, followed by Ca 2 V 2 O 7 and CaV 2 O 6 , especially at low temperature. CONCLUSION: The mineralogical analyses results showed that the main products for the dissolution of Ca 2 V 2 O 7 and Ca 3 V 2 O 8 are needle-like CaSO 4 ·0.5H 2 O, whereas for CaV 2 O 6 are undissolved CaV 2 O 6 and hydrolyzed V 2 O 5 . The dissolution kinetics indicate that the dissolution of CaV 2 O 6 follows second-order pseudo-homogeneous model, whilst Ca 2 V 2 O 7 and Ca 3 V 2 O 8 follow the diffusion through the product or ash layer model. The apparent activation energies for the dissolution of CaV 2 O 6 , Ca 2 V 2 O 7 , and Ca 3 V 2 O 8 were determined as 46.44, 38.72, and 23.50 kJ mol −1 , respectively.

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“…Most vanadium is extracted from titanium magnetite ores. Currently, ferrovanadium production technology includes four process stages: the fabrication of vanadium iron, the processing of the iron to a steel semi-product and a converter slag, the fabrication of technical vanadium pentoxide, and the electrical furnace or ladle melting of ferrovanadium [2,3,4,5,6,7,8,9]. There are also other options for vanadium extraction [10,11,12,13,14].…”

Section: Introductionmentioning

confidence: 99%

Features of the Microstructure and Chemical Compositions of Vanadium-Containing Slags Including Determination of Vanadium Oxidation Degrees

et al. 2019

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Metallurgical vanadium-containing converter slag could be used as an alternative vanadium source. The development of a physico-chemical basis for the comprehensive processing of industrial vanadium-containing debris requires information about their elemental composition as well as the oxidation degrees of the elements and forms of compounds in order to solve two key problems: a better utilization of industrial wastes and a lowering of environment impact. This research was aimed at the development of methods to determine the fractions of elements and their oxidation degrees in vanadium-containing industrial debris exemplified by basic oxygen converter vanadium slags. A set of bulk and surface analysis methods (X-ray fluorescence analysis (XRF), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS)) was used for this purpose: based on results of elemental analysis, SEM detects the oxide phases of metals, while an analysis of the XPS lines’ fine structures provides fractions of corresponding elements with definite oxidation degrees. In this way, one can determine the fractions of vanadium in multiple oxidation degrees in slags and can properly select the chemicals and parameters of chemical processes for its fullest extraction.

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Enhanced leaching of vanadium slag in acidic solution by electro-oxidation

Cited by 65 publications

References 12 publications

Crystallization Behavior and Growth Mechanisms of Spinel Crystals in Vanadium-Containing Slags

Crystallization Behavior and Growth Mechanisms of Spinel Crystals in Vanadium-Containing Slags

Dissolution kinetics of calcium vanadates in sulfuric acid: a fundamental study for the vanadium extraction process

Features of the Microstructure and Chemical Compositions of Vanadium-Containing Slags Including Determination of Vanadium Oxidation Degrees

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