Utilization of Basic Oxygen Furnace (BOF) slag in the production of a hydraulic cement binder |
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Authors: | A Srinivasa Reddy RK Pradhan Sanjay Chandra |
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Institution: | 1. Research and Development, Tata Steel Ltd., Jamshedpur, India;2. Chief Planning and Budgeting, Engineering Projects, Tata Steel Ltd., Jamshedpur, India;3. Chief R&D, Research and Development, Tata Steel Ltd., Jamshedpur, India |
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Abstract: | Basic Oxygen Furnace (BOF) slag is a major waste product generated during the steelmaking process. In India and in most industrial countries, the use of BOF slag as a road ballast and land filler has had a very long history. This being a low end use, a study was conducted to examine the possibility of converting the slag into a hydraulic binder. This paper describes the effect of cooling rate on mineralogy and cementing characteristics of normal BOF slag as well as iron oxide-devoid BOF slag. Specifically, the mineralogy and compressive strengths of heat-treated slags were compared with a conventional ordinary Portland cement. It was found that the slowly cooled slags did not show any cementing properties. The iron oxide-devoid slag, on slow cooling, disintegrated into fine powder. The water-cured cubic specimens of quenched slag products were tested for their compressive strengths. The cementing properties of the quenched slag products were improved by formation of hydraulic phases and showed considerable strength after 28 days of water curing. |
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Keywords: | BOF Basic Oxygen Furnace C2S dicalcium silicate C2F dicalcium ferrite C3S tricalcium silicate OPC ordinary Portland cement SEM scanning electron microscope BSE backscatter electron XRD X-ray diffraction |
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