ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Influence of MgO and Al2O3 Contents on Viscosity of Blast Furnace Type Slags Containing FeO
Joo Ro KimYoung Seok LeeDong Joon MinSung Mo JungSang Ho Yi
Author information

2004 Volume 44 Issue 8 Pages 1291-1297


The viscosities of CaO-SiO2-Al2O3-MgO-FeO slag were measured under conditions of C/S=1.35-1.45, 10-18 mass% Al2O3, 3.5-10 mass% MgO and 5 mass% FeO. The bosh slag with 10 mass% Al2O3 content had the lowest melting temperature and the widest solid-liquid coexisting region at about 5 mass% MgO, while in case of 14 mass% Al2O3, an increase in a MgO content from about 3.5 to 10 mass% raised the melting point of bosh slag. The viscosity of bosh slag also exhibited a minimum value at about 7 mass% MgO at temperatures above 1 723 K. However, it was not significantly changed with varying MgO content. On the hand, with increasing Al2O3 content, the viscosity of bosh slag increased at a fixed C/S and MgO content. Based on the melting temperature and the behavior of viscosity at a fixed temperature, it could be proposed that the MgO and Al2O3 contents in bosh slag should be maintained around 5 and 10 mass%, respectively, for high pulverized-coal ratio (PCR) and low slag volume operations in blast furnace.

Information related to the author
© The Iron and Steel Institute of Japan
Previous article Next article