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| Pilot practice of direct modification of molten blast furnace slag and preparation of mineral wool fiber |
| LI Jun1，ZHANG Ling-ling2，ZHAO Gui-zhou1，CANG Da-qiang1 |
（1. School of Metallurgical and Ecological Engineering， University of Science and Technology Beijing， Beijing 100083，China
2. School of Energy and Environmental Engineering， University of Science and Technology Beijing，Beijing 100083， China） |
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Abstract Molten blast furnace slag flowed into electric furnace through the slag runner and siliceous additives as modification agent were simultaneously added into the electric furnace to remelt the slag. The modified slag was heated to 1 400-1 500 ℃ by electric furnace and then the molten slag with proper viscosity and fluidity was prepared into fireproof，thermal insulation and sound absorbing slag wool fiber through high-speed centrifugation method. Parameters of the slag wool fiber met the?national standards，with shot content of 4.7%，average diameter of 5.5 μm and water-absorption rate of 0.2%. Energy consumption and cost decreased by 40%-60% compared with traditional cupola furnace method. The new technology of preparing mineral wool fiber using direct modification provided a high value added method for the direct utilization of molten blast furnace slag.
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Received: 09 March 2017
Published: 07 September 2017
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2017, Vol. 52 
