Synthesis and characterization of low-cost zeolite NaA from coal gangue by hydrothermal method

Jin, Yuxuan; Li, Li; Liu, Ze; Zhu, Siyu; Wang, Dongmin

doi:10.1016/j.apt.2021.01.024

Cited by 49 publications

(22 citation statements)

References 47 publications

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“…After 800°C, almost no weight loss could be observed, suggesting that C has been completely removed. This result is consistent with the literature reported previously 14,27 . DSC curve has an exothermic peak at 1193°C, which may be the formation of some second phases including mullite or spinel phase 28.…”

Section: Resultssupporting

confidence: 93%

“…This result is consistent with the literature reported previously. 14,27 DSC curve has an exothermic peak at 1193 C, which may be the formation of some second phases including mullite or spinel phase.28 Therefore, 800 C could be chosen as an appropriate calcination temperature, at which C could be completely removed and R Fe2O3, M reaches the maximum value.…”

Section: Characterizationmentioning

confidence: 99%

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Synthesis of zeolite A with high whiteness from coal gangue by two‐step pretreatment method

Liu

Yan

et al. 2022

Asia-Pacific J Chem Eng

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The comprehensive utilization of coal gangue (CG) is restricted by color elements in CG including C and Fe x O y . The magnetic separation and hydrothermal acid leaching are combined to pretreat the solid waste CG to synthesize zeolite A with high whiteness. Firstly, Fe 2 O 3 component in CG is in situ reduced by C to magnetite in the process of high-temperature calcination for decarburization followed by physical magnetic separation. Secondly, the residual Fe impurity in CG is further removed by hydrothermal acid leaching. The effects of calcination temperature, calcination time, acid leaching temperature, acid concentration, and liquid to solid ratio on Fe removal rate (R Fe2O3 ) and the whiteness of the synthesized zeolite A are investigated. The influence of Fe impurities on the Ca 2+ ion exchange capacity (E) of the zeolite A synthesized from CG is clarified. R Fe2O3 could reach the value of 88.53%. The synthesized zeolite A exhibits a typical cubic morphology with rounded edges, the high whiteness of 95.46%, and the satisfactory E with the value of 296.02 mgCaCO 3 Ág À1 , both of which meet the requirements of national standard. This work suggests that this pretreatment method for CG would have broad prospects in the efficient resource utilization of CG.

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Section: Resultssupporting

confidence: 93%

Section: Characterizationmentioning

confidence: 99%

Synthesis of zeolite A with high whiteness from coal gangue by two‐step pretreatment method

Liu

Yan

et al. 2022

Asia-Pacific J Chem Eng

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“…The degree of purity was calculated at 97.0%. It is worth mentioning that the quartz phase (JCPDS 33-1161) came from the fly ash as it is a stable phase [42]. The morphology of synthesized NaA is shown in Figs.…”

Section: Resultsmentioning

confidence: 99%

The influence of separately and combined bentonite and kaolinite as binders for pelletization of NaA zeolite from coal fly ash

2022

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Pelletization of zeolitic materials is required to facilitate their practical industrial and commercial applications. Zeolite-NaA was synthesized from fly ash by the fusion method and shaped into spherical granules. Bentonite, kaolinite, and a combination of bentonite with kaolinite were tested as binders with different contents from 5 to 10 wt%. The pellet formation was optimized. The physicochemical properties of binders, zeolite powder, and zeolite granular were characterized by X-ray fluorescence spectroscopy (XRF), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), nitrogen adsorption/desorption isotherm, and scanning electron microscopy (SEM) among other techniques. Deformation and breakage behavior of spherical granulates by compression was also studied. The best performance was obtained by the pellet with 10% bentonite with satisfactory mechanical strength and water resistance. The XRD and SEM results revealed NaA zeolite granular with a typical cubic shape and high crystallinity formed on the surface of bentonite. This result presents a potential use of the coal fly ash to obtain pelletized NaA zeolite following the principles of circular economy and the sustainable development goals (SDGs), particularly SDG 12.

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“…Prior to measurement the samples were degassed for 12 hours at 200 °C before adsorption. 27 Al and 29 Si MAS-NMR spectra were recorded on a Brucker 300 MHz (AMX 300) at 78.20 and 58.48 MHz, respectively. The chemical shift in ppm was obtained with respect to AlCl 3 .6H 2 O and TMS as external references for Al and Si, respectively.…”

Section: Characterization Techniquesmentioning

confidence: 99%

Synthesis and characterization of ecofriendly materials zeolite from waste glass and aluminum scraps using the hydrothermal technique

Sayehi¹,

Delahay²,

Tounsi³

2022

Journal of Environmental Chemical Engineering

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Synthesis and characterization of low-cost zeolite NaA from coal gangue by hydrothermal method

Cited by 49 publications

References 47 publications

Synthesis of zeolite A with high whiteness from coal gangue by two‐step pretreatment method

Synthesis of zeolite A with high whiteness from coal gangue by two‐step pretreatment method

The influence of separately and combined bentonite and kaolinite as binders for pelletization of NaA zeolite from coal fly ash

Synthesis and characterization of ecofriendly materials zeolite from waste glass and aluminum scraps using the hydrothermal technique

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