Sequential biological process for molybdenum extraction from hydrodesulphurization spent catalyst

Vyas, Shruti; Ting, Yen‐Peng

doi:10.1016/j.chemosphere.2016.06.060

Cited by 27 publications

(11 citation statements)

References 23 publications

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“…Bioleaching of secondary sources such as spent catalyst, fly ash, and mine tailings has been found promising [9,[101][102][103][104][105]. However, the effect of ultrasound has only been examined on bioleaching of low grade ores and bottom ash.…”

Section: Future Directions In Sonobioleachingmentioning

confidence: 99%

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A Review of the Application of Ultrasound in Bioleaching and Insights from Sonication in (Bio)Chemical Processes

Vyas

Ting

2017

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Chemical and biological leaching is practiced on a commercial scale for the mining of metals from ores. Although bioleaching is an environmentally-friendly alternative to chemical leaching, one of the principal shortcomings is the slow rate of leaching which needs to be addressed. The application of ultrasound in bioleaching, termed sonobioleaching, is a technique which has been reported to increase the rate and extent of metal extraction. This article reviews efforts made in the field of sonobioleaching. Since bioleaching is effectively a biological and chemical process, the effects of sonication on chemical leaching/reactions and biological processes are also reviewed. Although sonication increases metal extraction by increasing the metabolite production and enhanced mixing at a micro scale, research is limited in terms of the microorganisms explored. This paper highlights some shortcomings and limitations of existing techniques, and proposes directions for future research.

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Section: Future Directions In Sonobioleachingmentioning

confidence: 99%

“…Researchers have investigated various strategies to overcome this drawback [8][9][10][11][12][13]. The use of ultrasound has been investigated, although this technique is limited to only tank-type reactors.…”

Section: Introductionmentioning

confidence: 99%

A Review of the Application of Ultrasound in Bioleaching and Insights from Sonication in (Bio)Chemical Processes

Vyas

Ting

2017

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“…There are conventional approaches like pyrometallurgy, hydrometallurgy along with the greener and equally potent bioleaching route to extract the valuable metals from spent catalyst. Though bioleaching is more preferred by the researchers owing to the eco-friendly and costeffective line of action to leach out metals into the solution by the attack of bio-oxidized ferric ion and protons as lixiviant yet it's scope is limited by its metal selective approach [4]. Many researchers have attempted the use of pure acids (H2SO4, HCl) and alkali (NaOH, Na2CO3, NH4OH, NH4Cl, (NH4)2CO3 [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Characterization of different types of petroleum refinery spent catalyst followed by microbial mediated leaching of metal values

2021

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The present study aims for characterization and classification of five different spent petroleum refinery catalysts followed by metal recovery via bioleaching. The nomenclature given to the different spent catalyst (SC) is SC1, SC2, SC3, SC4 and SC5 collected from an Indian petroleum refinery. All spent catalysts were crushed and ground prior to their characterization by X-Ray Fluorescence for chemical composition followed by X-Ray Diffraction and Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy for their mineralogy. Further, all five spent catalysts were classified based upon their chemical composition and mineralogy. Metal recovery from the spent catalysts was carried out by bioleaching by a mixed microbial consortium of iron and Sulphur oxidizing microorganisms. Most of the spent catalysts showed very significant metal recovery with respect to Ni, Cu, Cr, Mo, Zn, Sr and Ti. The study provides a possible metal recovery route via bioleaching for further testing and scaling up.

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“…Therefore, pyrite bioleaching is useful for the extraction of a variety of useful metals [2]. Bioleaching is also used in treating spent catalysts to recover a lot of valuable metal [3,4]. When exposed to the atmosphere, pyrite generates an acidic, metal-enriched effluent, so-called "acid mine drainage" (AMD), which is accelerated by the growth of microbes and is harmful to the environment [5].…”

Section: Introductionmentioning

confidence: 99%

Contributions of Microbial “Contact Leaching” to Pyrite Oxidation under Different Controlled Redox Potentials

et al. 2020

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The function of microbial contact leaching to pyrite oxidation was investigated by analyzing the differences of residue morphologies, leaching rates, surface products, and microbial consortia under different conditions in this study. This was achieved by novel equipment that can control the redox potential of the solution and isolate pyrite from microbial contact oxidation. The morphology of residues showed that the corrosions were a little bit severer in the presence of attached microbes under 750 mV and 850 mV (vs. SHE). At 650 mV, the oxidation of pyrite was undetectable even in the presence of attached microbes. The pyrite dissolution rate was higher with attached microbes than that without attached microbes at 750 mV and 850 mV. The elemental sulfur on the surface of pyrite residues with sessile microorganisms was much less than that without attached microbes at 750 mV and 850 mV, showing that sessile acidophiles may accelerate pyrite leaching by reducing the elemental sulfur inhibition. Many more sulfur-oxidizers were found in the sessile microbial consortium which also supported the idea. The results suggest that the microbial “contact leaching” to pyrite oxidation is limited and relies on the elimination of elemental sulfur passivation by attached sulfur-oxidizing microbes rather than the contact oxidation by EPS-Fe.

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Sequential biological process for molybdenum extraction from hydrodesulphurization spent catalyst

Cited by 27 publications

References 23 publications

A Review of the Application of Ultrasound in Bioleaching and Insights from Sonication in (Bio)Chemical Processes

A Review of the Application of Ultrasound in Bioleaching and Insights from Sonication in (Bio)Chemical Processes

Characterization of different types of petroleum refinery spent catalyst followed by microbial mediated leaching of metal values

Contributions of Microbial “Contact Leaching” to Pyrite Oxidation under Different Controlled Redox Potentials

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