Characterization of steelmaking waste aime at its application in cementitious matrices

Mariana Zani Pagio Lilian Favarato Carrareto Geilma Lima Vieira Diego Corrêa Magalhães About the authors

Abstract

The steel industry, despite its importance in the global economy, is responsible for the generation of a high volume of waste in its production chain. Aiming at sustainable development, civil construction absorbs steelmaking waste, offering alternatives of raw materials and reducing the extraction of natural resources. In this study, the generation of four steelmaking wastes is highlighted: blast furnace slag (granulated and air-cooled), Shredder residue and electric arc furnace (EAF) dust. This paper aims to perform a physical, chemical, mineralogical, microstructural and environmental characterization of the waste, aiming at its incorporation in cementitious matrices. The granulated blast furnace slag was found to have an amorphous structure, which makes it a potentially reactive material, while the air-cooled blast furnace slag has a crystalline structure. The two slags have a fineness and chemical composition similar to that of Portland cement, with a predominance of SiO 2 and CaO. The EAF dust is a fine material, with grains in spherical shapes and a chemical composition rich in iron and zinc. Shredder residue has a predominance of silica and iron and high loss on ignition, due to the materials that compose it.

Keywords:
Steelmaking wastes; Blast furnace slag; EAF dust; Shredder residue; Cementitious matrices

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