ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Phase Equilibria in High MgO Ferro-manganese and Silico-manganese Smelting Slags
B. ZHAOE. JAKP. C. HAYES
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2005 Volume 45 Issue 7 Pages 1019-1026

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Abstract

Liquidus isotherms and phase equilibria have been determined experimentally for a pseudo-ternary section of the form “MnO”-(CaO+MgO)-(SiO2+Al2O3) with a fixed Al2O3/SiO2 weight ratio of 0.17 and MgO/CaO weight ratio of 0.17 for temperatures in the range 1473-1673 K.
The primary phase fields present for the section investigated include manganosite (Mn,Mg,Ca)O; dicalcium silicate α-2(Ca,Mg,Mn)O · SiO2; merwinite 3CaO · ((Mg,Mn)O · 2SiO2; wollastonite [(Ca,Mg,Mn)O · SiO2]; diopside [(CaO,MgO,MnO,Al2O3) · SiO2]; tridymite (SiO2); tephroite [2(Mn,Mg)O · SiO2]; rhodonite [(Mn,Mg)O · SiO2] and melilite [2CaO · (MgO,MnO,Al2O3) · 2(SiO2,Al2O3)].
The liquidus temperatures relevant to ferro-manganese and silico-manganese smelting slags have been determined. The liquidus temperature is shown to be principally dependent on the modified basicity weight ratio (CaO+MgO)/(SiO2+Al2O3) at low MnO concentrations, and dependent on the mole ratio (CaO+MgO+MnO)/(SiO2+Al2O3) at higher MnO concentrations.

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© 2005 by The Iron and Steel Institute of Japan
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