Synthesis and characterization of transition aluminas from recycled scrap aluminum Síntesis y caracterización de alúminas de transición a partir de desechos de aluminio reciclado

SAAB, ELVIRA; PALMA, CARLOS; RODRÍGUEZ, ROSA MARÍA; LABRADOR, NORBERTO; GUTIÉRREZ-CAMPOS, DELIA; HUNG, XAVIER

REVISTA INTERNACIONAL DE CONTAMINACIóN AMBIENTAL

CENTRO CIENCIAS ATMOSFERA UNAM

Año: 2020 vol. 36 p. 1011 - 1018

0188-4999

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 treat-ments 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 puz-zolanic materials, among others.