Structure of amorphous aluminosilicates obtained from mineral transformation: Potential path for partial remediation of alkaline bauxite residues

Highly alkaline wastes known as bauxite residue are the abundant byproducts of refining bauxite into alumina through the Bayer process, and worldwide estimates of these bauxite residue stockpiles exceed 3 billion tons, with hundreds of millions of tons produced annually. Bauxite residue utilization...

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Autores principales:	David L. Bollinger, Jessica Erickson, Nicholas Stone-Weiss, Arumala Josiah Lere-Adams, Sam Karcher, Idil Deniz Akin, John S. McCloy
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Sodalite Cancrinite Protoclays Allophane Bauxite Imogolite Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/389724f10ef7439f91b341fbf9ae3470
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spelling	oai:doaj.org-article:389724f10ef7439f91b341fbf9ae34702021-12-02T05:04:15ZStructure of amorphous aluminosilicates obtained from mineral transformation: Potential path for partial remediation of alkaline bauxite residues2666-765710.1016/j.envadv.2021.100136https://doaj.org/article/389724f10ef7439f91b341fbf9ae34702021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666765721001071https://doaj.org/toc/2666-7657Highly alkaline wastes known as bauxite residue are the abundant byproducts of refining bauxite into alumina through the Bayer process, and worldwide estimates of these bauxite residue stockpiles exceed 3 billion tons, with hundreds of millions of tons produced annually. Bauxite residue utilization and remediation are significantly complicated by the presence of recalcitrant minerals that buffer pH, such as sodalite and cancrinite, commonly referred to as desilication products (DSP) in the alumina industry. In this work, a mixture of sodalite (∼52 wt%) and cancrinite (∼30 wt%) was produced using similar conditions to those encountered in some alumina refineries using the Bayer process. These synthetic minerals were then transformed to hydrated aluminosilicates using a simple, low temperature aqueous process. The transformed products were then characterized with X-ray diffraction, infrared spectroscopy, nuclear magnetic resonance, and electron microscopy. Results suggest that a hypothesized conversion to 2:1-type clay minerals was not achieved, but that the materials were ∼79 wt% X-ray amorphous, resembling protoclay-like materials, with silicate network structures and primarily 4-coordinated Al atoms. This was confirmed by independent synthesis and structural comparison with amorphous aluminosilicates based on allophane and imogolite. Water vapor sorption behavior was similar for the synthesized allophane and the converted DSP minerals; ∼0.3 g/g sorbed water content. The current process produces highly amorphous aluminosilicate gels with hydraulic properties similar to silica-rich allophane, which have the potential to aid in the remediation of bauxite residue storage facilities.David L. BollingerJessica EricksonNicholas Stone-WeissArumala Josiah Lere-AdamsSam KarcherIdil Deniz AkinJohn S. McCloyElsevierarticleSodaliteCancriniteProtoclaysAllophaneBauxiteImogoliteEnvironmental sciencesGE1-350ENEnvironmental Advances, Vol 6, Iss , Pp 100136- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Sodalite Cancrinite Protoclays Allophane Bauxite Imogolite Environmental sciences GE1-350
spellingShingle	Sodalite Cancrinite Protoclays Allophane Bauxite Imogolite Environmental sciences GE1-350 David L. Bollinger Jessica Erickson Nicholas Stone-Weiss Arumala Josiah Lere-Adams Sam Karcher Idil Deniz Akin John S. McCloy Structure of amorphous aluminosilicates obtained from mineral transformation: Potential path for partial remediation of alkaline bauxite residues
description	Highly alkaline wastes known as bauxite residue are the abundant byproducts of refining bauxite into alumina through the Bayer process, and worldwide estimates of these bauxite residue stockpiles exceed 3 billion tons, with hundreds of millions of tons produced annually. Bauxite residue utilization and remediation are significantly complicated by the presence of recalcitrant minerals that buffer pH, such as sodalite and cancrinite, commonly referred to as desilication products (DSP) in the alumina industry. In this work, a mixture of sodalite (∼52 wt%) and cancrinite (∼30 wt%) was produced using similar conditions to those encountered in some alumina refineries using the Bayer process. These synthetic minerals were then transformed to hydrated aluminosilicates using a simple, low temperature aqueous process. The transformed products were then characterized with X-ray diffraction, infrared spectroscopy, nuclear magnetic resonance, and electron microscopy. Results suggest that a hypothesized conversion to 2:1-type clay minerals was not achieved, but that the materials were ∼79 wt% X-ray amorphous, resembling protoclay-like materials, with silicate network structures and primarily 4-coordinated Al atoms. This was confirmed by independent synthesis and structural comparison with amorphous aluminosilicates based on allophane and imogolite. Water vapor sorption behavior was similar for the synthesized allophane and the converted DSP minerals; ∼0.3 g/g sorbed water content. The current process produces highly amorphous aluminosilicate gels with hydraulic properties similar to silica-rich allophane, which have the potential to aid in the remediation of bauxite residue storage facilities.
format	article
author	David L. Bollinger Jessica Erickson Nicholas Stone-Weiss Arumala Josiah Lere-Adams Sam Karcher Idil Deniz Akin John S. McCloy
author_facet	David L. Bollinger Jessica Erickson Nicholas Stone-Weiss Arumala Josiah Lere-Adams Sam Karcher Idil Deniz Akin John S. McCloy
author_sort	David L. Bollinger
title	Structure of amorphous aluminosilicates obtained from mineral transformation: Potential path for partial remediation of alkaline bauxite residues
title_short	Structure of amorphous aluminosilicates obtained from mineral transformation: Potential path for partial remediation of alkaline bauxite residues
title_full	Structure of amorphous aluminosilicates obtained from mineral transformation: Potential path for partial remediation of alkaline bauxite residues
title_fullStr	Structure of amorphous aluminosilicates obtained from mineral transformation: Potential path for partial remediation of alkaline bauxite residues
title_full_unstemmed	Structure of amorphous aluminosilicates obtained from mineral transformation: Potential path for partial remediation of alkaline bauxite residues
title_sort	structure of amorphous aluminosilicates obtained from mineral transformation: potential path for partial remediation of alkaline bauxite residues
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/389724f10ef7439f91b341fbf9ae3470
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Structure of amorphous aluminosilicates obtained from mineral transformation: Potential path for partial remediation of alkaline bauxite residues

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