Inertization of wastes in the steelworks

World Congress and Expo on Recycling

July 20-22, 2015 Barcelona, Spain

Romaniello L1, Lorenzi A2, Alfieri I2 and Montenero A2

Posters-Accepted Abstracts: J Environ Anal Toxicol

Abstract :

One of the priorities of Europe is the promotion of environmental sustainability at the basin level to improve socioeconomic development and to promote better human conditions. To promote environmental sustainability the objective �??zero waste�?� is a priority, in particular the reuse and/or the recycling of waste as resource. The vitrification of wastes from steel industry processes to produce not hazardous materials has been investigated to obtain product as raw material for different type of industries. In order to assess the chemical resistance of the produced glasses, samples were subjected to leaching tests in acid solution and in pure water according to UNI EN 12457-2:2004 and very low release values for metallic micro pollutants were obtained for all the produced materials. The samples with the highest amount of iron oxide clearly show the crystallization of iron oxides: magnetite/maghemite and hematite. This behavior suggests that the maximum amount of iron oxides that the glass network can incorporate is about 30% by weight (as Fe2O3); if this level is exceeded, pure iron oxide phases separate. In the raw materials the iron ions are mostly (more than 98%) introduced as Fe3+, but temperature and environment promote a partial reduction of the iron ions from Fe+3 to Fe+2 and the formation of magnetite (together with hematite).