2024-03-28T09:14:47Zhttps://repositori.uji.es/oai/requestoai:repositori.uji.es:10234/1617222022-10-24T09:24:45Zcom_10234_7053com_10234_9col_10234_8639
Repositori UJI
author
Galindo Llorach, Roberto
author
Padilla, I.
author
Sánchez-Hernández, R.
author
Robla, J.I.
author
Monrós, Guillermo
author
López-Delgado, A.
2016-07-15T10:12:46Z
2016-07-15T10:12:46Z
2015-12
GALINDO, R., et al. Production of added-value materials from a hazardous waste in the aluminium tertiary industry: Synergistic effect between hydrotalcites and glasses. Journal of Environmental Chemical Engineering, 2015, vol. 3, no 4, p. 2552-2559.
http://hdl.handle.net/10234/161722
http://dx.doi.org/10.1016/j.jece.2015.09.012
The powdered solids trapped in filter sleeves in the aluminium tertiary industry are currently disposed of in secure landfills as a result of environmental considerations. Their classification as a hazardous waste is due to their high aluminium content as metallic aluminium or in compounds such as aluminium nitride. These compounds can react with a very low moisture content to release toxic or hazardous gases such as hydrogen and ammonia. This paper presents a low-cost process for the full recovery of this hazardous waste in three steps leading to the production of two different added-value materials. In the first step, mild acid hydrolysis of the waste is carried out to obtain a concentrated aluminium solution and an inert cake. The following steps consist of hydrotalcite synthesis with the resulting solution, and the production of transparent glasses in the CaO–Al2O3–SiO2 system with the cake. Characterisation of the products obtained indicates that the hydrotalcites can adsorb anionic pollutants (molybdates) in a simple way, while the glasses afford improved optical properties in comparison with those prepared by direct vitrification of the waste.
eng
Copyright © 2015 Elsevier Ltd. All rights reserved.
Aluminium hazardous waste
Hydrotalcite
Calcium silicoaluminate glass
Reclycling
Production of added-value materials from a hazardous waste in the aluminium tertiary industry: Synergistic effect between hydrotalcites and glasses
info:eu-repo/semantics/article
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