Etude des poudres synthétisées à partir des scories d’aluminium et de dolomie par le processus dissolution-précipitationcalcination

Abstract

As part of this work, we were interested in the study of powders synthesized from aluminum slag and dolomite by dissolution-precipitation-calcination process. Aluminum slag from the company AMR was used as alumina (Al2O3) source of and dolomite from Teioualt djebel as MgO source to promote the formation of spinel. At the beginning of the work, the starting materials were characterized. According to the chemical analyses, a mixture (Al slag/dolomite) which theoretically gives an equimolar Al2O3/MgO final composition was chosen. The starting materials were subjected to a synthesizing protocol comprising: dissolution of each material independently, precipitation and calcination. The obtained powder was characterized by several physicochemical methods (XRD, FTIR, SEM, EDX, laser granulometry). It was found composed of spinel (Mg0.4A2.4O4) as a major phase associated to alumina (Al2O3) with traces of impurities (CaO, SiO2...). The particles of the obtained powder are in agglomerated state and have a micronic size (5.6 μm- 8.71 μm)