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Experimental investigation of the viscosities in CaO-SiO2-MgO-Al2O3 and CaO-SiO2-MgO-Al2O3-TiO2 slags
Tata Steel, Jamshedpur.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
Department of Metallurgy, Indian Institute of Science, Bangalore.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2007 (English)In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 38, no 6, 911-915 p.Article in journal (Refereed) Published
Abstract [en]

The viscosities of high alumina blast furnace slags were experimentally determined by the rotating cylinder method using the Brookfield digital viscometer model LVDV-II + pro. Two different slag systems were considered for the current study, the CaO-SiO2-MgO-Al2O3 quaternary and the CaO-SiO2-MgO-Al2O3-TiO2 quinary system. Experiments were conducted in the temperature range of 1650 to 1873 K. The effects of temperature, basicity, TiO2, and silica activity of slags on viscosity were studied. The viscosity decreases with basicity for high alumina blast furnace slags with basicity in the range of 0.46 to 0.8. At high basicity (similar to 0.8), slag viscosity decreases even with a small amount of TiO2 (similar to 2 pct) addition in the slag. With an increase in silica activity in the range of 0.1 to 0.4, the slag viscosity increases, the increases being steeper below the liquidus temperature.

Place, publisher, year, edition, pages
2007. Vol. 38, no 6, 911-915 p.
Keyword [en]
Alkalinity; Alumina; Blast furnaces; Silica; Viscometers; Viscosity measurement; Digital viscometer models; Liquidus temperature; Quinary systems; Slags
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-17182DOI: 10.1007/s11663-007-9087-5ISI: 000251925700008Scopus ID: 2-s2.0-37249038999OAI: oai:DiVA.org:kth-17182DiVA: diva2:335225
Note
QC 20100818Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Studies on High Alumina Blast Furnace Slags
Open this publication in new window or tab >>Studies on High Alumina Blast Furnace Slags
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

In the present work, viscosities and sulphide capacities of high alumina blast furnace slags were investigated. The systems investigated were four component CaO-SiO2-MgO-Al2O3 quaternary system, CaO-SiO2-MgO-Al2O3-TiO2 and CaO-SiO2-MgO-Al2O3-CaF2 quinary systems.

Viscosities of high alumina blast furnace slags were experimentally determined by the rotating cylinder method using Brookfield digital viscometer model LVDV-II+ pro. Experiments were conducted in the temperature range of 1573- 1873 K. The effects of temperature, basicity, TiO2, CaF2 and silica activity of slags on viscosity were studied. Viscosity decreases with basicity for high alumina blast furnace slags with increase in basicity and CaF2. At higher basicity (~0.8), slag viscosity decreases even with small amount of TiO2 (~2%) addition in the slag. With increase in silica activity in the range of 0.1 to 0.4,viscosity of slag increases and the increase is steeper below liquidus temperature.

Sulphide capacity of the slag was measured using gas-slag equlibria. The liquid slag was equilibrated with Ar-CO-CO2-SO2 gas mixture. The slag systems studied were the same as in the case of viscosity measurements. Experiments were conducted in the temperature range of 1773 to 1873 K. Effect of temperature, basicity, MgO,TiO2 and CaF2 contents of slags on sulphide capacity were studied. As expected, sulphide capacity was found to increase with increase in temperature and basicity. At higher experimental temperature (~ 1873 K) TiO2 was found to decrease the sulphide capacity of slags. But, at lower temperature, there was no significant effect of TiO2 on the sulphide capacity. Sulphide capacity increases with increase in MgO content of slag if MgO content is more than 5%.

Based on above experimental data, models were developed for estimation of viscosity and sulphide capacity of blast furnace slags. These models were later on applied for designing the slags for achieving the optimum slag characteristics so that slag volume can be reduced. With the help of these models slag volume was reduced to the extent of 5-10 kg per ton hot metal and also silicon content of the hot metal was reduced by around 10% with some improvement in slag viscosity and sulphide capacity of the slag.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. 43 p.
Series
KTH/MSE, 2007:38
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-4431 (URN)978-91-7178-710-1 (ISBN)
Public defence
2007-06-15, Sal B1, KTH, Brinellvägen 23, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100818Available from: 2007-06-08 Created: 2007-06-08 Last updated: 2010-08-18Bibliographically approved

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