Expedited Stabilization of Furnace Slag Produced from Basic Oxygen Steelmaking

  • Da-Yun Huang
  • Shu-Lan Ke
  • Chien-Kuei Chang
  • Chao-Ming Hsu
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 293)

Abstract

Steelmaking plants in Taiwan using basic oxygen processes generate over a million tons of basic oxygen furnace slag (BOFS) annually. The slag contains free CaO and f-CaO, which are characterized by high pH values and high expansion rates, thus significantly compromising the potential of the slag for resource reuse. Various techniques have been adopted in attempts to stabilize the slag, but none have been effective in terms of completely depleting the f-CaO, leaving the slag unusable and raising serious waste disposal issues. This research explores the effects of the immersion method on the stabilization process for BOFS in a series of experiments. Results show that even long periods of immersion fail to produce complete f-CaO depletion, and indicate that the slag’s porous and closed microstructure may be the cause of this problem. SEM and EDS analysis on slag cross-sections verify that the f-CaO is partially covered by metals, such as Fe and Mn, or other compounds, such that stabilizing processes are only able to partially degrade the f-CaO content.

Keywords

Basic oxygen furnace slag (BOFS) f-CaO Chemical immersion Porous 

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Da-Yun Huang
    • 1
  • Shu-Lan Ke
    • 2
  • Chien-Kuei Chang
    • 2
  • Chao-Ming Hsu
    • 1
  1. 1.Department of Mechanical EngineeringNational Kaohsiung University of Applied ScienceKaohsiungTaiwan, Republic of China
  2. 2.Department of Chemical and Materials EngineeringNational Kaohsiung University of Applied ScienceKaohsiungTaiwan, Republic of China

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