SYNTHESIS AND CHARACTERIZATION OF TRANSITION ALUMINAS FROM RECYCLED SCRAP METAL

PALMA, CARLOS; HUNG HUNG, YUK MING X.; SAAB, ELVIRA; LABRADOR, NORBERTO; RODRÍGUEZ, ROSA MARÍA; GUTIÉRREZ-CAMPOS, DELIA

San Carlos de Bariloche

Congreso; XXXVI Congreso Latinoamericano ALAFAR 2016; 2016

Asociación Latinoamericana de Fabricante de Refractarios (ALAFAR)

This study was initiated in order to develop an alternative methodology for the synthesis of transition aluminas that could potentially be used as binder of monolithic refractories. The objective was established with the purpose to reduce ecological costs by using recycled metal scrap as raw material.The synthesis technique employed yield a precursor comprised 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. SEM evaluations showed the presence of agglomerates of particles between 50 and 300 μm. Bimodal grain sizes distribution was detected during laser granulometric test. Thermogravimetric analysis of the precursor indicated 40.6% total weight loss at 1000°C. The heat treatments at 350°C and 750°C of precipitates for 1, 2 and 4 hours, produced various transition aluminas (γ, η, θ), which might have potential use as binder in monolithic products, catalyst support or additive for puzzolanic materials, among others.