SYNTHESIS AND CHARACTERIZATION OF TRANSITION ALUMINAS FROM RECYCLED SCRAP ALUMINUM

The aim of this study was to develop an alternative methodology for the synthesis of transition aluminas, in order to reduce ecological costs by using recycled metal scrap as raw material (cans of soft drinks) and generate a product with high added value. The synthesis technique employed yielded a p...

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Veröffentlicht in:Revista Internacional de Contaminación Ambiental 2020-01, Vol.36 (4), p.1011
Hauptverfasser: Rodríguez, Rosa María, Gutiérrez-Campos, Delia, Saab, Elvira, Labrador, Norberto, Hung, Xavier, Palma, Carlos
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container_issue 4
container_start_page 1011
container_title Revista Internacional de Contaminación Ambiental
container_volume 36
creator Rodríguez, Rosa María
Gutiérrez-Campos, Delia
Saab, Elvira
Labrador, Norberto
Hung, Xavier
Palma, Carlos
description The aim of this study was to develop an alternative methodology for the synthesis of transition aluminas, in order to reduce ecological costs by using recycled metal scrap as raw material (cans of soft drinks) and generate a product with high added value. The synthesis technique employed yielded a precursor comprised of 55.4 % of bayerite, 41.2 % of boehmite, and ammonium salt, according the characterization performed with X-ray diffraction and quantification by the Rietveld method. The ammonium chloride salt present is not relevant for the process, since given its solubility in water, it could be eliminated by successive washing. Scanning electron microscopy evaluations showed the presence of agglomerates of particles between 50 and 300 μm. A bimodal grain sizes distribution was detected during the laser granulometric test. Thermogravimetric analysis of the precursor indicated a 40.6 % total weight loss at 1000 ºC. The heat treatments at 350 and 750 ºC of precipitates for 1, 2 and 4 h, produced various transition aluminas (γ, η, θ), which are products where value has been added and might have a potential use as binders in monolithic products, catalyst support, or additives for puzzolanic materials, among others.
doi_str_mv 10.20937/RICA.53532
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source Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals
subjects Additives
Agglomerates
Aluminum
Ammonium
Ammonium chloride
Ammonium salts
Beverages
Binders
Boehmite
Catalysts
Grain size distribution
Heat treatment
Heat treatments
Metal scrap
Precipitates
Precursors
Recycled materials
Rietveld method
Scanning electron microscopy
Soft drinks
Synthesis
Thermogravimetric analysis
Transitional aluminas
Weight loss
X-ray diffraction
title SYNTHESIS AND CHARACTERIZATION OF TRANSITION ALUMINAS FROM RECYCLED SCRAP ALUMINUM
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