Some Results of Researches to Develop the Proper Recycling Methods of Technological Residues from Secondary Aluminum Industry - ROMAN, Maria; TEODORESCU, Romaniţa; FIRESCU, Lucia; CRIŞAN, Aurel; MĂRGINEAN, Ioan; COCOLAŞ, Adrian (The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science, 2007)