Journal of Northeastern University Natural Science ›› 2015, Vol. 36 ›› Issue (11): 1601-1604.DOI: 10.12068/j.issn.1005-3026.2015.11.018

• Materials & Metallurgy • Previous Articles     Next Articles

Solidification Behaviour and Viscosity Behaviour of Blast Furnace Slag Modified by Tailings

LI Jie 1, LIU Wei-xing2, ZHANG Yu-zhu1,2, ZHAO Kai 2   

  1. 1.School of Materials & Metallurgy, Northeastern University, Shenyang 110819, China; 2. The Key Laboratory with Modern Metallurgical Technology, Ministry of Education, North China University of Science and Technology, Tangshan 063009, China.
  • Received:2014-11-10 Revised:2014-11-10 Online:2015-11-15 Published:2015-11-10
  • Contact: ZHANG Yu-zhu
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Abstract: Tailings of different mass fractions were added into the blast furnace slag (BF slag) as the modifier, and the solidification behaviour and viscosity behaviour of the modified molten slag were studied. Mineral composition and microstructure of the modified molten slag were analyzed by X-ray diffraction (XRD) and polarizing microscope. The viscosity curves between 1200℃ and 1475℃ were studied by synthetic test instrument for the physical characteristics. The results indicated that when the acidity coefficient (Mk) of the molten slag reaches 1.2~1.8 after adding tailings, the solidification structure of the molten slag has mainly an amorphous/vitreous character, and the microstructure is a compact and uniform structure except for Mk=1.8. In addition, the suitable temperature range for melting fabrication is significantly increased. The appropriate mass fraction of tailings is 16.98%~34.18%.

Key words: blast furnace slag, mineral composition, microstructure, viscosity

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