Characterization of basic oxygen furnace slag and granite waste mixtures to Portland cement production

• Published in: REM - International Engineering Journal 2016-12, Vol.69 (4), p.459-464
• Main Authors: Pinto Junior, Luiz Alberto Baptista, Berger, Anna Paula Littig, Junca, Eduardo, Grillo, Felipe Fardin, Sampaio, Ney Pinheiro, Oliveira, José Roberto de
• Format: Article
• Language: English
• Subjects: Basic oxygen furnace; ENGINEERING, MECHANICAL; GEOLOGY; granite waste; MECHANICS; METALLURGY & METALLURGICAL ENGINEERING; Portland cement; solid waste
• ISSN: 2448-167X; 2448-167X
• DOI: 10.1590/0370-44672016690046

Abstract The aim of this paper is to analyze mixtures of basic oxygen furnace slag and granite waste in order to produce Portland cement. X-ray patterns were carried out in both the basic oxygen furnace slag and granite waste. Then, mixtures were prepared to obtain the binary basicity of 0.5, 0.9 and 1.2. The mixtures were melted at 1500ºC. Two cooling steps were performed. The first cooling step was accomplished inside the furnace in order to determine the phases formed during the melting step. The second cooling process was carried out in water in order to obtain an amorphous structure. Images via scanning electrons microscopy and EDS spectrum were obtained for the mixtures cooling in water. The results showed that basic oxygen furnace slag contains a higher percent of CaO. A binary basicity of 4.6 was determined. The granite waste appeared as mainly a quartz phase. During the slow cooling step, silicates (akermanite and gehlenite) were formed. On the fast cooling step, amorphous structures were obtained. In addition, images obtained via scanning electrons microscopy showed glass structures. EDS spectrum indicated that the glass structures were composed for calcium silicates. Thus, the results suggest that mixtures using basic oxygen furnace slag and granite waste presented characteristics desirable for Portland cement production.