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

Hyoung Soon Jang; Jae Wook Ryu; Il Sohn

doi:10.1007/s11663-014-0234-5

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

Hyoung Soon Jang, Jae Wook Ryu, Il Sohn

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

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.

Original language	English
Pages (from-to)	606-614
Number of pages	9
Journal	Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume	46
Issue number	2
DOIs	https://doi.org/10.1007/s11663-014-0234-5
Publication status	Published - 2015 Apr 1

Bibliographical note

Publisher Copyright:
© 2014, The Minerals, Metals & Materials Society and ASM International.

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys
Materials Chemistry

Access to Document

10.1007/s11663-014-0234-5

Cite this

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title = "FeMn Metal Droplet Behavior in the MnO-SiO2-CaO Slag System",

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{\textquoteright} law.",

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