Study on the recycling of valuable metals in spent Al2O3-based catalyst

Chen, Y.; Feng, Qiming; Zhang, G.; Ou, Leming; Lu, Yiping

doi:10.1007/bf03403355

Cited by 7 publications

(4 citation statements)

References 11 publications

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“…In recent decades, many researchers have studied and developed methods for separating and recovering vanadium and molybdenum from leaching solutions. The main methods for the separation of vanadium and molybdenum are ion exchange [10,11], solvent extraction [12][13][14] and chemical precipitation [15]. Among them, the solvent extraction method is the most widely used depending on its simple operation, selective control of separation and complete separation.…”

Section: Introductionmentioning

confidence: 99%

Separation of vanadium and molybdenum from aqueous solution using PEG2000 + sodium sulfate + water aqueous two-phase system

2019

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The separation of vanadium (V) and molybdenum (VI) was studied by co-extraction with an aqueous two-phase system formed by PEG2000 + sodium sulfate + water and by selective stripping with another aqueous two-phase system formed by ammonium sulfate solution and PEG2000 phase loaded vanadium and molybdenum. The effect of aqueous pH, concentration of vanadium and molybdenum, temperature on the co-extraction and concentration of ammonium sulfate, temperature and phase ratio on selective stripping separation of vanadium and molybdenum was investigated. The experimental results on co-extraction of vanadium and molybdenum indicated that the co-extraction rate of both metals is sensitive to aqueous pH, and their extraction rate can achieve above 97.54% and 99.49%, respectively, when the pH value of aqueous solution is at 2.0, the molar ratio of vanadium to molybdenum is about 1.5, the concentration of PEG2000 is 20%, and the temperature is 313.15 K, respectively. The co-extraction rate of both metals decreases slightly with an increase in temperature from 313.15 to 343.15 K. The extraction isotherm and McCabe-Thiele method showed that two theoretical stages are needed when concentration of vanadium and molybdenum decreases from initial 12 g/L and 10 g/L to 0.1 g/L under the optimal conditions. The results on selective stripping of both metals from loaded PEG2000 phase to aqueous phase indicated that the stripping rate and precipitation rate of vanadium are evidently impacted by aqueous pH within 8.0 ~ 11.0 and then a little influenced by other parameters. The stripping rate of molybdenum is relatively lower than that of vanadium and is influenced by all kinds of stripping conditions. The stripping rate and precipitation rate of vanadium achieve 99.88% and 98.84%, respectively, and stripping rate of molybdenum achieves 81.99% under the optimal stripping conditions of O/A = 2:1, stripping temperature 343.15 K, (NH 4 ) 2 SO 4 (w/w) 40% and the pH of aqueous solution at 10.0.

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Section: Introductionmentioning

confidence: 99%

Separation of vanadium and molybdenum from aqueous solution using PEG2000 + sodium sulfate + water aqueous two-phase system

2019

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“…There are several methods which have been introduced to separate and remove V from Cr. The method of precipitation is the most cost-efficient and easiest way to extract V from solution (Chen et al, 2007) but it is not suitable for the removal of V in trace amount as in the waste water. The method of capillary electrophoresis has been introduced to separate V and Cr ions (Yeh et al, 2004), but its column capacity is too low to remove V in quantity from Cr.…”

Section: Introductionmentioning

confidence: 99%

Removal of V(V) from aqueous Cr(VI)-bearing solution using anion exchange resin: Equilibrium and kinetics in batch studies

Zhang

et al. 2016

Hydrometallurgy

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Vanadium (V) and chromium (Cr) co-exists in the whole process of V extraction from the vanadium titano-magnetite ore in China. It remains a challenge to remove trace V(V) from Cr(VI) in a simple way. Based on facile pretreatment of transforming Cr(VI) selectively, a novel method to remove V(V) from Cr(VI) by anion exchange resin Dex-V has been established. The influence of operation parameters including pH, contact time and temperature on adsorption ratio has been investigated. The Langmuir model and Henry model were successfully applied to describe the adsorption behavior of V by the Dex-V resin. It is shown that V is adsorbed chemically in monolayer and the Dex-V resin presents a homogeneous nature. Kinetics of V adsorption was analyzed with the pseudo-second order model, the Richenberg model and the Weber-Morris model. Results show that the rate of V adsorption is controlled by film diffusion in initial 70 min and the intra-particle diffusion contributes to the rate-controlling after 70 min. The proposed method was applied to remove V from real waste water and the removal ratio as high as 96% was obtained, with Cr recovery of 95%, which validates the effectiveness and efficiency of the novel method. This work has thus provided new insights into separation and recovery of analogue metals in aqueous.

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“…The sodium aluminate solution is mainly derived from the Bayer process or the alkaline process of smelting bauxite. Additionally, with the increasing demands for environmental protection and the development of resource recycling, businesses not only smelt bauxite but also are now utilizing aluminum-rich fly ash, ,− coal gangue, red mud, , waste alumina, ,, and nuclear-contaminated sludge ,, to extract aluminum to produce sodium aluminate solution. Due to variations in raw materials and processing techniques, the concentration and component ratios of sodium aluminate solution differ, thereby influencing the process and reaction conditions of carbonate reaction to produce pseudoboehmite, consequently affecting process control and the properties of the products.…”

Section: Introductionmentioning

confidence: 99%

Study on Controlled Synthesis of Mesoporous Pseudoboehmite via Carbonation Reaction

Zhang,

Liu,

et al. 2024

Ind. Eng. Chem. Res.

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Pseudoboehmite is a precursor for mesoporous-activated alumina and is widely employed in catalysis and adsorption applications. The carbonation reaction is recognized as the most environmentally friendly and cost-effective production method. However, its susceptibility to impurity formation poses challenges in practical applications. The control of the reaction end point pH is crucial for ensuring purity. Currently, there is a lack of research on the influence of sodium aluminate solution concentration and composition ratio (α k ) on the reaction end point pH and its impact on the crystallization mechanism. This research extensively explored the effects of the sodium aluminate solution concentration and α k on the carbonation process. Analysis of crystalline phases under different conditions emphasized the critical influence of concentration and α k on the critical end point pH of pseudoboehmite synthesis and its impact on the crystallization mechanism. The results revealed significant effects of the concentration and α k on the pH change during the carbonation reaction. Increasing concentration raised both the maximum and minimum end point pH values, while elevated α k had the opposite effect. Increasing α k and concentration led to a narrowing of the pH range at the end point of the carbonation reaction for preparing pseudoboehmite. The study revealed that pseudoboehmite and Bayerite crystals were generated from two different sodium aluminate decomposition pathways, which challenges the conventional understanding of the crystalline growth mechanism of aluminum hydroxide. Reducing the pH value of the reaction end point accelerated the nucleation of pseudoboehmite and inhibition of Bayerite. Ultimately, successfully synthesizing mesoporous pseudoboehmite and activated alumina, with a pore volume of 0.44 cm 3 /L, surface area of 242.76 m 2 /g, and average pore diameter of 7.3 nm, this study not only supported precise reaction control and enhanced production efficiency but also offered insights for eco-friendly utilization of CO 2 , thus contributing to a more sustainable and environmentally friendly production process.

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Study on the recycling of valuable metals in spent Al2O3-based catalyst

Cited by 7 publications

References 11 publications

Separation of vanadium and molybdenum from aqueous solution using PEG2000 + sodium sulfate + water aqueous two-phase system

Separation of vanadium and molybdenum from aqueous solution using PEG2000 + sodium sulfate + water aqueous two-phase system

Removal of V(V) from aqueous Cr(VI)-bearing solution using anion exchange resin: Equilibrium and kinetics in batch studies

Study on Controlled Synthesis of Mesoporous Pseudoboehmite via Carbonation Reaction

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