Open Access

Materials, volume 14, issue 24, pages 7700

Kinetics Study of Al Extraction from Desilicated Coal Fly Ash by NaOH at Atmospheric Pressure

Shoppert Andrei ¹

Loginova Irina ¹

Valeev Dmitry ²

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Department of Non-ferrous Metals Metallurgy, Ural Federal University, 620002 Yekaterinburg, Russia |

Laboratory of Sorption Methods, Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences, 119991 Moscow, Russia |

Publication type: Journal Article

Publication date: 2021-12-13

Multidisciplinary Digital Publishing Institute (MDPI)

Journal: Materials

Quartile SCImago

Quartile WOS

Impact factor: 3.4

ISSN: 19961944

DOI: 10.3390/ma14247700

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PubMed ID: 34947303

General Materials Science

Abstract

The most promising source of alumina in the 21st century is the coal fly ash (CFA) waste of coal-fired thermal plants. The methods of alumina extraction from CFA are often based on the pressure alkaline or acid leaching or preliminary roasting with different additives followed by water leaching. The efficiency of the alumina extraction from CFA under atmospheric pressure leaching is low due to the high content of acid-insoluble alumina phase mullite (3Al2O3·2SiO2). This research for the first time shows the possibility of mullite leaching under atmospheric pressure after preliminary desilication using high liquid to solid ratios (L:S ratio) and Na2O concentration. The analysis of the desilicated CFA (DCFA) chemical and phase composition before and after leaching has been carried out by inductively coupled plasma optical emission spectrometry (ICP-OES) and X-ray diffraction (XRD). The morphology and elemental composition of solid product particles has been carried out by scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX). An automated neural network and a shrinking core model (SCM) were used to evaluate experimental data. The Al extraction efficiency from DCFA has been more than 84% at T = 120 °C, leaching time 60 min, the L/S ratio > 20, and concentration of Na2O—400 g L−1. The kinetics analysis by SCM has shown that the surface chemical reaction controls the leaching process rate at T < 110 °C, and, at T > 110 °C after 15 min of leaching, the process is limited by diffusion through the product layer, which can be represented by titanium compounds. According to the SEM-EDX analysis of the solid residue, the magnetite spheres and mullite acicular particles were the main phases that remained after NaOH leaching. The spheric agglomerates of mullite particles with non-porous surface have also been found.

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	1 2 3 4
Materials	Materials, 4, 28.57% Materials 4 publications, 28.57%
Minerals	Minerals, 3, 21.43% Minerals 3 publications, 21.43%
Metals	Metals, 2, 14.29% Metals 2 publications, 14.29%
Materials for Renewable and Sustainable Energy	Materials for Renewable and Sustainable Energy, 1, 7.14% Materials for Renewable and Sustainable Energy 1 publication, 7.14%
Journal of Cleaner Production	Journal of Cleaner Production, 1, 7.14% Journal of Cleaner Production 1 publication, 7.14%
Journal of Environmental Chemical Engineering	Journal of Environmental Chemical Engineering, 1, 7.14% Journal of Environmental Chemical Engineering 1 publication, 7.14%
Applied Sciences (Switzerland)	Applied Sciences (Switzerland), 1, 7.14% Applied Sciences (Switzerland) 1 publication, 7.14%
Hydrometallurgy	Hydrometallurgy, 1, 7.14% Hydrometallurgy 1 publication, 7.14%
	1 2 3 4

Citations by publishers

	2 4 6 8 10
Multidisciplinary Digital Publishing Institute (MDPI)	Multidisciplinary Digital Publishing Institute (MDPI), 10, 71.43% Multidisciplinary Digital Publishing Institute (MDPI) 10 publications, 71.43%
Elsevier	Elsevier, 3, 21.43% Elsevier 3 publications, 21.43%
Springer Nature	Springer Nature, 1, 7.14% Springer Nature 1 publication, 7.14%
	2 4 6 8 10

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Shoppert A., Loginova I., Valeev D. Kinetics Study of Al Extraction from Desilicated Coal Fly Ash by NaOH at Atmospheric Pressure // Materials. 2021. Vol. 14. No. 24. p. 7700.

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Shoppert A., Loginova I., Valeev D. Kinetics Study of Al Extraction from Desilicated Coal Fly Ash by NaOH at Atmospheric Pressure // Materials. 2021. Vol. 14. No. 24. p. 7700.

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TY - JOUR

DO - 10.3390/ma14247700

UR - https://doi.org/10.3390%2Fma14247700

TI - Kinetics Study of Al Extraction from Desilicated Coal Fly Ash by NaOH at Atmospheric Pressure

T2 - Materials

AU - Loginova, Irina

AU - Shoppert, Andrei

AU - Valeev, Dmitry

PY - 2021

DA - 2021/12/13 00:00:00

PB - Multidisciplinary Digital Publishing Institute (MDPI)

SP - 7700

IS - 24

VL - 14

PMID - 34947303

SN - 1996-1944

ER -

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@article{2021_Shoppert,

author = {Irina Loginova and Andrei Shoppert and Dmitry Valeev},

title = {Kinetics Study of Al Extraction from Desilicated Coal Fly Ash by NaOH at Atmospheric Pressure},

journal = {Materials},

year = {2021},

volume = {14},

publisher = {Multidisciplinary Digital Publishing Institute (MDPI)},

month = {dec},

url = {https://doi.org/10.3390%2Fma14247700},

number = {24},

pages = {7700},

doi = {10.3390/ma14247700}

}

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Shoppert, Andrei, et al. “Kinetics Study of Al Extraction from Desilicated Coal Fly Ash by NaOH at Atmospheric Pressure.” Materials, vol. 14, no. 24, Dec. 2021, p. 7700. https://doi.org/10.3390%2Fma14247700.

Found error?

Publisher

Multidisciplinary Digital Publishing Institute (MDPI)

Journal

Materials

Quartile SCImago

Quartile WOS

Impact factor

3.4

ISSN

19961944 (Print)

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