Characteristics of Steel Slag Granulated in a Steel Plant - Valuation of the Microstructure through Electron Probe Micro Analysis

Title: Characteristics of Steel Slag Granulated in a Steel Plant - Valuation of the Microstructure through Electron Probe Micro Analysis
Author(s): Dal Molin
Paper category : conference
Book title: International RILEM Conference on the Use of Recycled Materials in Building and Structures
Editor(s): E. Vázquez, Ch. F. Hendriks and G.M.T. Janssen
Print-ISBN: 2-912143-52-7
e-ISBN: 2912143756
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 1067 - 1075
Total Pages: 9
Nb references: 17
Language: English

Abstract: The recycling of waste appears as an appropriated alternative to dumping and provides
many environment benefits. Steel slag is metallurgical waste generated during the
steelmaking process and is normally dumped in open areas. Steel slag generally exhibit
volumetric instability and show expansion with age, which is considered a limiting factor
when used in civil construction. The stabilization of the steel slag can be obtained through
granulation by quenching method. This work evaluates the characteristics of a granulated
blast oxygen furnace (BOF) slag. In the stabilization process, liquid slag was granulated in a
steel plant situated in Brazil. Some characteristics of the granulated slag, such as physical
properties, chemical and mineralogical compounds, and expansion were evaluated. The
microstructure of the sample was evaluated through back-scattered electron (BSE) image and
electron probe micro analysis (EPMA). The granulation by quenching method reduced traces
of free lime in the slag, improved elimination of periclase and (bêta)C2S, which are considered
causes of expansion. The high basicity of BOF slag, however, makes it difficult to convert its
crystalline structure into an amorphous and the metallic fraction separation.

Online publication: 2004-09-29
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143756.117