Recovery of molybdenum from leach solution using polyelectrolyte extraction

Shalchian, Hossein; Ferella, Francesco; Birloaga, Ionela; Michelis, Ida De; Vegliò, Francesco

doi:10.1016/j.hydromet.2019.105167

Cited by 20 publications

(6 citation statements)

References 51 publications

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“…Various methods for recovery of HDS catalysts have been proposed in the literature: acid leaching followed by solvent extraction [11], primary leaching of spent catalyst, and then separation of metals through selective precipitation [12] recovery from biotechnological routes [13,14], carbon adsorption [15], polyelectrolyte extraction [16] and solvent extraction [17][18][19]. To all methods mentioned above, the recovery of metals was at different rates; however, the extraction of metals can achieve around 90% [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Extraction and Recovery of Metals from Spent HDS Catalysts: Lab- and Pilot-Scale Results of the Overall Process

Xhaferaj

Ippolito

Maggiore³

et al. 2022

Metals

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The present study proposes an overall recycling process for spent hydrodesulfurization (HDS) catalysts. These catalysts contain valuable metals like cobalt (Co), molybdenum (Mo), nickel (Ni), and vanadium (V). In particular, one Co-Mo catalyst was treated in order to optimize the roasting step (time, soda ash, and temperature) at a pilot scale and thus maximize the extraction yield of molybdenum (Mo) and vanadium (V). In particular, a dry Co-Mo catalyst was used. After roasting at 700 °C for 2.5 h, the best conditions, the catalysts underwent water leaching, separating Mo and V from Co and the alumina carrier, which remained in the solid residue. The pregnant solution was treated to remove arsenic (As) and phosphorus (P), representing the main impurities for producing steel alloys. V was precipitated as NH4Cl, and further calcined to obtain commercial-grade V2O5, whereas Mo was recovered as molybdic acid by further precipitation at a pH of around one. Thus, molybdic acid was calcined and converted into commercial-grade MoO3 by calcination. The hydrometallurgical section was tested on a lab scale. The total recovery yield was nearly 61% for Mo and 68% for V, respectively, compared with their initial concentration in the spent Co-Mo catalysts.

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Section: Introductionmentioning

confidence: 99%

Extraction and Recovery of Metals from Spent HDS Catalysts: Lab- and Pilot-Scale Results of the Overall Process

Xhaferaj

Ippolito

Maggiore³

et al. 2022

Metals

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“…The selection of aluminum salts as a coagulant is less common, and the addition of coagulation aid chemicals, such as polyacrylamide, is suggested [111]. In fact, the application of commercially available formulations based on organic polyelectrolytes, which can achieve removal efficiencies around 90%, has gained attention in recent years [112,113]. The results obtained with the main coagulants employed for molybdenum removal are compiled in Table 9.…”

Section: Coagulation-flocculation-precipitationmentioning

confidence: 99%

An Overview to Technical Solutions for Molybdenum Removal: Perspective from the Analysis of the Scientific Literature on Molybdenum and Drinking Water (1990–2019)

Abejón

2022

Water

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A bibliometric analysis using the Scopus database was performed to investigate the research documents published from 1990 to 2019 in scientific sources related to molybdenum in drinking water and determine the quantitative characteristics of the research in this period. The results from the analysis revealed that the number of publications was maintained at a regular production of around 5 papers per year until 2009, followed by a fast linear increase in the production in the period from 2010 to 2016 (29 papers in 2016), but the scientific production regarding this topic was reduced in 2017 and 2018 to recover the production obtained in 2016 once again in 2019. The total contribution of the three most productive countries (USA, China and India, respectively) accounted for around 50% of the total number of publications. Environmental Science was the most common subject (51.4% contribution), followed by Chemistry (26.7% contribution). The research efforts targeted toward the search for technical solutions for molybdenum removal from water are not as important as the ones focused on the identification of molybdenum-polluted water bodies and the analysis of the health effects of the intake of molybdenum. Nevertheless, examples of technological treatments to remove molybdenum from the aqueous solution include the use of adsorption and ion exchange; coagulation, flocculation and precipitation followed by filtration; membrane technologies and biological treatments.

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“…Chemical leaching employs various reagents such as nitric acid (HNO 3 ), sulfuric acid (H 2 SO 4 ), hydrogen peroxide, ammonia, sodium hydroxide solution, potassium isocyanate, and cyanide. 5,88,89 The subsequent step is the purification of the leached solutions, which involves separation of solids and 90,91 Finally, the metal recovery process concludes the hydrometallurgical process. This step involves employing techniques such as electrolysis, 92 gaseous reduction, 93 and precipitation 94 to efficiently extract the desired metals from the solution.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Chemical leaching employs various reagents such as nitric acid (HNO 3 ), sulfuric acid (H 2 SO 4 ), hydrogen peroxide, ammonia, sodium hydroxide solution, potassium isocyanate, and cyanide. ,, The subsequent step is the purification of the leached solutions, which involves separation of solids and liquids and dissolving impurities. This can be accomplished through methods like neutralization or precipitation, recrystallization, solvent extraction, adsorption, membrane separation, electrochemical reduction, electrowinning, and ion exchange. , Finally, the metal recovery process concludes the hydrometallurgical process. This step involves employing techniques such as electrolysis, gaseous reduction, and precipitation to efficiently extract the desired metals from the solution.…”

Section: Introductionmentioning

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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Recovery of molybdenum from leach solution using polyelectrolyte extraction

Cited by 20 publications

References 51 publications

Extraction and Recovery of Metals from Spent HDS Catalysts: Lab- and Pilot-Scale Results of the Overall Process

Extraction and Recovery of Metals from Spent HDS Catalysts: Lab- and Pilot-Scale Results of the Overall Process

An Overview to Technical Solutions for Molybdenum Removal: Perspective from the Analysis of the Scientific Literature on Molybdenum and Drinking Water (1990–2019)

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

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