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.
Highlights
Increasing industrial production increases waste generation, which has a cost for its disposal such as transport to send it to the landfills and environmental control
Xray pattern from granite waste showed quartz as mainly components. This suggests a potential to utilization in Portland cement production with basic oxygen furnace slag (BOFS) in order to adjust the binary basicity
Mixtures under slowly cooling showed formation of silicates. This fact was correlated with chemical composition fit caused by addition of granite waste
Summary
Increasing industrial production increases waste generation, which has a cost for its disposal such as transport to send it to the landfills and environmental control. The reuse of waste is an alternative for the companies. Solid, order to reuse blast furnace slag (BFS) to liquid and gaseous wastes are gener- produce Portland cement (Garcia et al, ated, such as sludge, dust and slag (from 2014; Heikal et al, 2015; Saade et al, blast furnace and basic oxygen furnace) 2015). The production of Portland ce(Vieira et al, 2006) In this sector, sev- ment approaches 3700-4000 Mt/y. This eral researches have been performed in material is composed for SiO2, Al2O3, Fe2O3, CaO, MgO, SO3, K2O, Ti2O5, P2O5 (Sanjuán et al, 2015; Ma et al, 2015)
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