Effect of Mechanical Activation Treatment on the Recovery of Vanadium from Converter Slag

Xiang, Junyi; Huang, Qiao; Lv, Xuewei; Bai, Chenguang

doi:10.1007/s11663-017-1033-6

Cited by 38 publications

(11 citation statements)

References 12 publications

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“…, the reaction rate decreases with the extension of reaction time, that is contributed to the increase in path length for the diffusion of ions and the reduction of contact area between reactants . The calcium sulfate covered product layer also can be found in the vanadium‐bearing converter leaching process, and the leaching of vanadium was controlled by solid product layer diffusion . The rate expression of second‐order pseudo‐homogeneous model can be correlated graphically as follows:

{(1 - α)}^{- 1} - 1 = k_{1} t

…”

Section: Resultsmentioning

confidence: 99%

“…A 500 mL three‐necked flask equipped with a thermometer, pH meter, water condenser, and magnetic stirrer was used for dissolution. A stainless steel water bath was used to maintain the desired temperature of the flask, as mentioned in a previous study . For each run, a determined amount of sulfuric acid with a fixed pH value was charged into the reactor and heated to the required temperature.…”

Section: Methodsmentioning

confidence: 99%

“…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%

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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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{(1 - α)}^{- 1} - 1 = k_{1} t

…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Self Cite

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“…131 Finally, to enhance the leaching efficiency of V from converter slags, a mechanical activation treatment can be employed prior to the calcification-acid leaching process. This offers a simple, effective, and cost-efficient method to lower the roasting temperature and improve the leaching rate of V. 125 Smaller particles possess larger specific surface areas, which accelerates leaching kinetics and promotes faster release of heavy metals and other salts. 132 Based on Xiang et al's work, mechanical activation reduced the optimal roasting temperature from 1173 to 1073 K while increasing the leaching efficiency from ∼86% to ∼91% (Figure 5).…”

Section: Traditional Hydrometallurgical Extraction Techniques 1acid L...mentioning

confidence: 99%

A Review of Traditional and Intensified Hydrometallurgy Techniques to Remove Chromium and Vanadium from Solid Industrial Waste

Saidi,

El Khawaja,

Boffito

2023

ACS Eng. Au

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The continuous growth of industrial activities, driven by economic expansion and technological advancements, has increased industrial waste generation. These wastes often contain hazardous substances, including heavy metals. Their improper disposal has become a significant environmental and health concern, necessitating global attention. To address this issue and mitigate the scarcity and cost of raw materials, recycling waste materials has emerged as a viable solution, particularly in the synthesis of construction materials. Various methods, such as pyrometallurgical and hydrometallurgical techniques, have been established for recycling industrial waste. This Review focuses on hydrometallurgical techniques, specifically targeting the separation of two highly toxic heavy metals: chromium and vanadium. It comprehensively explores various hydrometallurgical methods, including acid, alkaline, organic, and oxidative leaching, for solid waste materials. Additionally, this Review highlights several intensified leaching processes assisted by electrical fields, supercritical fluids, plasma, microwaves, and ultrasound. The presented methods offer promising approaches to effectively manage industrial waste.

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“…The traditional process of extracting vanadium from converter vanadium slag is cooling, crushing, ball grinding, mixing and pelletizing, and then the pellets are roasted and leached to extract vanadium [20][21]. In other words, the heat of the vanadium slag from the converter is wasted, and then much energy is required to heat it to a certain temperature.…”

Section: Introductionmentioning

confidence: 99%

A new process for extracting vanadium by direct calcification using the heat of molten vanadium slag

Zhang

et al. 2022

J min metall B Metall

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A novel technology for extracting vanadium from molten converter vanadium slag was studied at the laboratory scale by oxidation and calcification. The effect of the cooling method, CaO addition and reaction time on the phases of calcified vanadium slag was studied. Under the action of oxygen and CaO, the molten vanadium slag underwent calcification reaction to form acid-soluble calcium vanadate phase, the feasibility of its main chemical reaction was calculated by Factsage8.1. The calcified vanadium slag was leached by H2SO4 solution and characterized by XRF, XRD, SEM and EDS techniques. Compared with the traditional process, the new process saved much energy, and it was faster and more efficient. The XRD results showed that CaV2O5, Ca7V4O17 and Ca3V2O8 were gradually formed in the molten vanadium slag with increasing CaO addition. However, when too much CaO was added, Ca2SiO4 and CaTiO3 were also formed. These phases wrapped part of the vanadium and reduced the leaching rate of vanadium. When the mass ratio of Ca to V was 0.75, under the optimal acid leaching conditions (particle size of calcified vanadium slag less than 0.075 mm, leaching temperature 90?C, H2SO4 concentration 200 g.L-1, liquid-to-solid ratio 6:1 ml.g-1, leaching time 60 min, stirring speed 300r.min-1), the leaching rate of vanadium from calcified vanadium slag could exceed 90%. The new process not only saved energy and reduced emissions, but also reached the average level of the existing vanadium extraction process.

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Effect of Mechanical Activation Treatment on the Recovery of Vanadium from Converter Slag

Cited by 38 publications

References 12 publications

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

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

A Review of Traditional and Intensified Hydrometallurgy Techniques to Remove Chromium and Vanadium from Solid Industrial Waste

A new process for extracting vanadium by direct calcification using the heat of molten vanadium slag

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