Synthesis strategies of alumina from aluminum saline slags
Fecha
2023Versión
Acceso abierto / Sarbide irekia
Tipo
Artículo / Artikulua
Versión
Versión publicada / Argitaratu den bertsioa
Identificador del proyecto
Impacto
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10.1016/j.psep.2023.03.006
Resumen
Aluminum saline slags is a waste of the metallurgical industry that presents serious environmental problems
since it needs very extensive areas for its disposal, the toxicity it causes in the atmosphere and groundwater, in
addition to high transportation costs. The valorization of this residue by the synthesis of alumina, a compound
widely used in the chemical industry, generates a high impact ...
[++]
Aluminum saline slags is a waste of the metallurgical industry that presents serious environmental problems
since it needs very extensive areas for its disposal, the toxicity it causes in the atmosphere and groundwater, in
addition to high transportation costs. The valorization of this residue by the synthesis of alumina, a compound
widely used in the chemical industry, generates a high impact and great interest. In this work, the strategies for
synthesizing alumina from aluminum saline slags are reviewed in a context of growing demand for this metal and
environmental crisis. The first sections present the aluminum production processes, both from natural bauxite
(primary process) and from the recycling of materials with a high aluminum content (secondary process); paying
attention to the waste generated and what environmental problems they produce. The main investigations that
have allowed to address the recovery of the waste generated are described below, focusing on the processes of
recovery/extraction of the aluminum present in its composition. The aluminum in these residues can be found as
a metal or forming other compounds such as simple or mixed oxides. Chemical processes are the most relevant,
especially those that deal with the acid and alkaline extraction of the metal. The most important section of the
work reports on the methods of synthesis of Al2O3, highlighting the methods of precipitation, sol-gel, hydrothermal synthesis, and combustion, among others. The work ends with a summary and conclusions section. [--]
Materias
Aluminum,
Alumina,
Saline slags,
Leaching,
Precipitation method,
Aluminum hydroxide
Editor
Elsevier
Publicado en
Process Safety and Environmental Protection, 172 (2023 ) 1010-1028
Departamento
Universidad Pública de Navarra. Departamento de Ciencias /
Nafarroako Unibertsitate Publikoa. Zientziak Saila /
Universidad Pública de Navarra/Nafarroako Unibertsitate Publikoa. Institute for Advanced Materials and Mathematics - INAMAT2
Versión del editor
Entidades Financiadoras
Spanish Ministry of Science and Innovation (MCIN/AEI/10.13039/501100011033) through project PID2020-112656RB-C21. Open access funding provided by Universidad Pública de Navarra.