Open Access
Metals, volume 10, issue 12, pages 1684
Complete Extraction of Amorphous Aluminosilicate from Coal Fly Ash by Alkali Leaching under Atmospheric Pressure
Publication type: Journal Article
Publication date: 2020-12-16
Metals and Alloys
General Materials Science
Abstract
One of the potential sources of alumina and mesoporous silica is the coal-fired thermal plants waste known as the coal fly ash (CFA). The studies of the alumina extraction from CFA are often focused on the preliminary desilication, but the efficiency of the alkali desilication is low due to formation of the desilication product—Na6[Al6Si6O24]·Na2X (DSP). This research is focused on the possibility of CFA desilication without formation of DSP using a leaching process with higher liquid to solid ratios (L/S) and alkali concentrations. The experimental data were analyzed using an artificial neural network (ANN) machine learning method and a shrinking core model (SCM). The investigation of the CFA morphology, chemical and phase composition before and after leaching were carried out by scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX), inductively coupled plasma optical emission spectrometry (ICP-OES) and X-ray diffraction (XRD). The present work shows that it is possible to avoid formation of DSP if using the L/S ratio >20 and concentration of Na2O—400 g/L during CFA leaching. The kinetics analysis by SCM showed that the process is limited by the surface chemical reaction at T <100 °C, and by diffusion through the product layer at T >100 °C, respectively. The SEM images of the solid residue after NaOH leaching under conditions that prevent the DSP formation show mullite particles with an acicular structure.
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Citations by publishers
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- We do not take into account publications that without a DOI.
- Statistics recalculated only for publications connected to researchers, organizations and labs registered on the platform.
- Statistics recalculated weekly.
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Shoppert A. et al. Complete Extraction of Amorphous Aluminosilicate from Coal Fly Ash by Alkali Leaching under Atmospheric Pressure // Metals. 2020. Vol. 10. No. 12. p. 1684.
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Shoppert A., Valeev D., Loginova I., Chaikin L. Complete Extraction of Amorphous Aluminosilicate from Coal Fly Ash by Alkali Leaching under Atmospheric Pressure // Metals. 2020. Vol. 10. No. 12. p. 1684.
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TY - JOUR
DO - 10.3390/met10121684
UR - https://doi.org/10.3390%2Fmet10121684
TI - Complete Extraction of Amorphous Aluminosilicate from Coal Fly Ash by Alkali Leaching under Atmospheric Pressure
T2 - Metals
AU - Loginova, Irina
AU - Chaikin, Leonid
AU - Shoppert, Andrei
AU - Valeev, Dmitry
PY - 2020
DA - 2020/12/16 00:00:00
PB - Multidisciplinary Digital Publishing Institute (MDPI)
SP - 1684
IS - 12
VL - 10
SN - 2075-4701
ER -
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@article{2020_Shoppert,
author = {Irina Loginova and Leonid Chaikin and Andrei Shoppert and Dmitry Valeev},
title = {Complete Extraction of Amorphous Aluminosilicate from Coal Fly Ash by Alkali Leaching under Atmospheric Pressure},
journal = {Metals},
year = {2020},
volume = {10},
publisher = {Multidisciplinary Digital Publishing Institute (MDPI)},
month = {dec},
url = {https://doi.org/10.3390%2Fmet10121684},
number = {12},
pages = {1684},
doi = {10.3390/met10121684}
}
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Shoppert, Andrei, et al. “Complete Extraction of Amorphous Aluminosilicate from Coal Fly Ash by Alkali Leaching under Atmospheric Pressure.” Metals, vol. 10, no. 12, Dec. 2020, p. 1684. https://doi.org/10.3390%2Fmet10121684.
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