A Novel Kinematic Model for Molten Slag Fiberization: Prediction of Slag Fiber Properties
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RODUCTION
CURRENTLY, slag and mineral wool products have been widely used in industry and civil engineering.[1–3] It is estimated that more than 50 pct market share of thermal insulation materials has been dominated by slag wool products in Europe. In China, with the rapid development and promotion of low energy consumption building, slag wool also has a glorious prospect. In traditional methods, raw materials such as basalt, diabase, dolomite, and granite are put into a cupola furnace to be melted and a mass of SOx and sulfides in the waste gas is being pumped into the air, which will cause energy consumption and severe contamination. Recently, the current research group proposed a novel method to produce slag wool directly using hightemperature blast furnace (BF) slag.[4,5] This approach not only could make the best use of waste energy and BF slag, but also could result in a decrease of energy dissipation and environmental pollution.[6] However, the fiberization rate remains relatively low and leads to a large amount of waste during the preparing process. Fiber formation mechanism at high temperature is still important to study. In addition, large-scale industrial production calls for efficient and high-quality slag wool products, which also depends on a clear understanding of the specific fiber-forming procedure. Among all the slag wool production methods, slag melt fiberization on a spinning wheel (Junkers technology) is acknowledged as the most common strategy. In this method, slag melt stream with the temperature DAWEI ZHAO, Doctoral Candidate, ZUOTAI ZHANG and XIDONG WANG, Professors, and LILI LIU, Doctor, are with the Beijing Key Laboratory for Solid Waste Utilization and Management and Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, P.R. China. Contact e-mail: [email protected]. Manuscript submitted May 15, 2014. METALLURGICAL AND MATERIALS TRANSACTIONS B
range of 1673 K to 1823 K (1400 °C to 1550 °C) falls on a spinning wheel (or wheels) and is dragged into filaments by centrifugal force. In this article, the spinning wheel method is considered. In the past decade, several researchers have paid attention to the production of slag wool. Bajcar et al.[7] proposed a statistic model to predict the thickness of fiber blanket in the gathering unit combined with experimental determination. Chelikani and Sparrow[8] developed numerical simulations of plane-wall Coanda effects to control the fiber trajectories. Blagojevic et al.[9] also presented a numerical algorithm and predicted the cooling process of fibers. Although the fibrous materials could be empirically produced with the spinning wheel method, the specific melt fiberization process was still unclear. The mechanism of the melt fiberization and elongation process is still poorly understood. No precise theory has explained the mechanical process of filament formation. Simulation of fiber formation remains a challenge in the slag fiber industry. To date, it can be summed up that a traditional method in research of the m
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