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FeMn Metal Droplet Behavior in the MnO-SiO2-CaO Slag System

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Abstract

Optimization of the MnO-SiO2-CaO-based slag composition in the FeMn decarburization refining process to minimize metal droplet entrainment has been studied. FeMn spherical droplets with average diameter of 2.5 mm were dispersed within the refining slag of the medium carbon grade ferro-manganese alloy process. Approximately 4.2 pct of the slag existed as FeMn droplets contributing to the overall metal yield loss in the current process. Sedimentation tests of slags with various SiO2 content ranging from 26 to 47 pct using Al2O3 crucibles held at 1773 K (1500 °C) for 30 minutes showed an improvement of the metal/slag separation. Estimated and measured viscosity of the slags showed SiO2 at 32 pct to be optimal for metal/slag separation. Changes in the SiO2 content to 32 pct in actual plant trials allowed significant decrease in the amount of metal droplet entrainment resulting in a decrease of metal in slag to 1.3 pct. Refining times for this optimized slag composition required at least 20 minutes holding for increased separation according to Stokes’ law.

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Acknowledgment

This study has been partially supported by BK21 (Brain Korea 21) Plus Project in the Division of the Eco-Humantronics Information Materials and the Ministry of Trade, Industry and Energy (2014-11-0698).

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Authors and Affiliations

  1. Materials Science and Engineering, Yonsei University, Seoul, 120-749, Korea

    Hyoung-Soon Jang (Graduate Student) & Il Sohn (Associate Professor)

  2. Korea Metal Material Research Association, Seoul, 138-950, Korea

    Jae Wook Ryu (Research Fellow)

Authors
  1. Hyoung-Soon Jang
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  2. Jae Wook Ryu
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  3. Il Sohn
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Correspondence to Il Sohn.

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Manuscript submitted July 31, 2014.

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Jang, HS., Ryu, J.W. & Sohn, I. FeMn Metal Droplet Behavior in the MnO-SiO2-CaO Slag System. Metall Mater Trans B 46, 606–614 (2015). https://doi.org/10.1007/s11663-014-0234-5

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