Extraction of silicon in the form of nanoparticles and nanorods from coal fly ash

Singh, Sugandha; Ghorai, Manas K.; Kar, Kamal K.

doi:10.1016/b978-0-12-817686-3.00008-6

Cited by 3 publications

(2 citation statements)

References 45 publications

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“…Further, the recovery and use of valuable elemental resources in CFA-such as carbon [9], alumina [10,11], lithium [12], gallium [13], scandium [14], and other rare Earth elements [15] have emerged as a global research priority, and numerous studies are being conducted to investigate various applications of CFA. In addition to valuable metal elements, CFA contains rich nonmetallic resources such as active silicon dioxide [16], which can be easily extracted using a sodium hydroxide (NaOH) solution [17,18], and further applied as nanomaterials [19,20], mesoporous materials [21,22], and adsorbent materials [23] in various fields.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis and formation mechanism of controllable magnesium silicate nanotubes derived from coal fly ash

et al. 2023

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A novel controllable magnesium silicate nanotube material derived from coal fly ash was successfully synthesized via a hydrothermal process for the first time, and the reaction conditions and mechanism of synthesizing magnesium silicate nanotube materials from magnesium oxide and sodium silicate extracted from the fly ash were studied. The optimal preparation conditions are temperature = 220°C, pH = 13.5, and Mg: Si molar ratio = 3:2, and the tubular structure gradually appeared and showed controllable and regular growth with the increase of synthesis time. The mechanism revealed that with the gradual dissolution of brucite into the sodium silicate solution, the reaction product begins to crystallize and transform from an initial sheet–like structure to a tubular structure, and finally becomes a uniformly arranged nanotube. The formation process of magnesium silicate nanotube follows Pauling’s fourth rule, Si–O tetrahedral coordination and Mg–OH octahedral coordination is further condensed to form a two-layer structure by the action of active oxygen, then the sheet is rolled into a tube under its structural stress. The growth of both outer tubular diameter and inner tubular diameter has good linear law and controllable, and the growth rate are 0.289 nm/h and 0.071 nm/h, respectively.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis and formation mechanism of controllable magnesium silicate nanotubes derived from coal fly ash

et al. 2023

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“…This enables a better and more efficient use of coal tailings, capable of contributing to local sustainability. It is worth remembering that scientific studies aimed at identifying nanoparticles (NPs, minerals and/or amorphous phases) present in coal tailings material after the mining process are necessary to understand the mechanisms of geological and environmental evolution and possible health risks [11,[36][37][38][39] when assessing provenance, migration, deposition and coal breakdown after the mining process. Natural NPs in coal mining areas are often neglected compared to traditional mineralogical materials [33,36,40,41].…”

Section: Introductionmentioning

confidence: 99%

Brazilian Coal Tailings Projects: Advanced Study of Sustainable Using FIB-SEM and HR-TEM

et al. 2022

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The objective of this study is to obtain a more detailed assessment of particles that contain rare-earth elements (REEs) in abandoned deposits of Brazilian fine coal tailings (BFCTs), so as to aid current coal mining industries in the identification of methodologies for extracting such elements (Santa Catarina State, Brazil). The BFCT areas were sampled for traditional mineralogical analysis by X-ray Diffraction, Raman Spectroscopy and nanomineralogy by a dual beam focused ion beam (FIB) coupled with field emission scanning electron microscopy (FE-SEM) and high-resolution transmission electron microscopy (HR-TEM) coupled with an energy dispersive X-ray microanalysis system (EDS). The results show that the smaller the sampled coal fines were, the higher the proportion of rare-earth elements they contained. Although the concentration of REEs is below what would normally be considered an economic grade, the fact that these deposits are already ground and close to the surface negate the need for mining (only uncovering). This makes it significantly easier for REEs to be extracted. In addition, owing to their proximity to road and rail transport in the regions under study, the opportunity exists for such resources (BFCTs) to be utilized as a secondary market as opposed to simply being discarded as has been done in the past.

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Innovative Utilization of Fly Ash in Geotechnical Engineering: An Analytical Review Supported by Extensive Geotechnical Testing

Saraswat,

Pandey,

Sharma

et al. 2024

E3S Web Conf.

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Extensive study has been conducted on the use of fly ash as an additive in soil and geotechnical engineering projects due to its capacity to enhance soil properties and the efficacy of geotechnical structures. Various fly ash samples had distinct elemental compositions; nevertheless, the chemical analysis indicated that Sample 3 possessed the highest silica content (55%), which corresponded with enhanced pozzolanic reactivity. The physical property tests revealed significant disparities; for instance, Sample 2 exhibited the smallest particles at 18 microns, but Sample 5 had the highest specific gravity at 2.5. This indicates that the qualities of the soil may alter when mixing these samples. The maximum dry density climbed to 2050 kg/m³, and the cohesive strength to 25 kPa with higher quantities of fly ash, as shown by geotechnical testing findings, which also revealed trends in shear strength parameters and compaction characteristics with varying fly ash concentrations. These findings underscore the potential of fly ash in geotechnical applications for soil stabilization, compaction enhancement, and load-bearing capacity augmentation. Optimizing soil behavior becomes feasible via the judicious use of fly ash, as shown by the enhancements in soil engineering properties found. Fly ash may be used in a few geotechnical applications, yet proper evaluation of its composition and physical properties, any adverse environmental and structure interaction with time must be made before applying the product. The present research focuses on the fly ash as the soil adding material and the direction of its activating material to the geotechnical built environment contributes significant knowledge of its application.

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Extraction of silicon in the form of nanoparticles and nanorods from coal fly ash

Cited by 3 publications

References 45 publications

Hydrothermal synthesis and formation mechanism of controllable magnesium silicate nanotubes derived from coal fly ash

Hydrothermal synthesis and formation mechanism of controllable magnesium silicate nanotubes derived from coal fly ash

Brazilian Coal Tailings Projects: Advanced Study of Sustainable Using FIB-SEM and HR-TEM

Innovative Utilization of Fly Ash in Geotechnical Engineering: An Analytical Review Supported by Extensive Geotechnical Testing

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