Treatment of LF Slag to Prevent Powdering during Cooling

  • Satadal Ghorai MEF Division CSIR-National Metallugical Laboratory Burmamines Jamshedpur - 831007 Jharkhand, India
  • Gopi K Mandal MEF Division CSIR-National Metallugical Laboratory Burmamines Jamshedpur - 831007
  • Syamantak Roy Formerly with CSIR-National Metallurgical Laboratory, Jamshedpur as Summer Research Fellow, Indian Academy of Sciences Presently, Graduate Student and Research Assistant Department of Metallurgical Engineering, University of Utah
  • R K Minj MEF Division CSIR-National Metallugical Laboratory Burmamines Jamshedpur - 831007
  • Archana Agrawal MEF Division CSIR-National Metallugical Laboratory Burmamines Jamshedpur - 831007
  • D P Singh MEF Division CSIR-National Metallugical Laboratory Burmamines Jamshedpur - 831007
  • Alok Kumar Tata Steel Ltd, Jamshedpur
  • R. B. V Ramana Tata Steel Ltd, Jamshedpur

Abstract


The polymorphic transformation of the monoclinic β-polymorph to the orthorhombic γ-polymorph of di-calcium silicate at around 500°C during cooling results in disintegration of slag. The slag generated during the production of TMT grade steel in ladle furnace at Tata steel Jamshedpur behaves similar manner. An attempt has been made to prevent this crumbling.  The experiments were conducted in 10 kg air induction furnace. Various types of silica source were used to reduce the basicity of the LF slag does not crumble. Optimization of the additives percentage and the optimum basicity was determined. Also, various types of additives like borax and barium carbonate were used to stabilize the β phase. Also the results indicate that 0.2% boarx, 2% barium carbonate and 1.7 basicity is required to prevent dusting. TCILP test (USEPA test no 1131) of the borax and barium carbonate treated samples indicate that barium carbonate treated slag contain high barium level. Therefore, it can not be used for the dusting prevention.

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Published
2017/03/08
How to Cite
Ghorai, S., Mandal, G. K., Roy, S., Minj, R. K., Agrawal, A., Singh, D. P., Kumar, A., & Ramana, R. B. V. (2017). Treatment of LF Slag to Prevent Powdering during Cooling. Journal of Mining and Metallurgy, Section B: Metallurgy, 53(2), 123-130. Retrieved from https://aseestant.ceon.rs/index.php/jmm/article/view/10359
Issue
Vol. 53 No. 2 (2017)
Section
Original Scientific Paper

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