Studies of the system CaO-SiO2-Al2O3-MgO in relation to the stability of blastfurnace slag

Gutt, W.; Russell, A. D.

doi:10.1007/bf00566249

Cited by 25 publications

(34 citation statements)

References 12 publications

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“…On the other hand, the phase diagram information of the Al 2 O 3 -CaO-MgO-SiO 2 quaternary involves considerable uncertainties. The available sections of the phase diagrams in this system in Slag Atlas 1) are after Osborn et al, 2,3) Gutt and Russel 4) as well as Cavalier and SandreoDendon. 5) Unfortunately, many liquidus temperatures are given as dotted lines.…”

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confidence: 98%

Characterization of Melting of Some Slags in the Al2O3–CaO–MgO–SiO2 Quaternary System

2006

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Ladle treatment plays increasingly important role in making clean steels nowadays. In many industrial practices, synthetic ladle slags are based on the Al 2 O 3 -CaO-MgOSiO 2 quaternary system. Usually, the compositions of the slags are targeted on the single liquid region of the phase diagram. On the other hand, the phase diagram information of the Al 2 O 3 -CaO-MgO-SiO 2 quaternary involves considerable uncertainties. The available sections of the phase diagrams in this system in Slag Atlas 1) are after Osborn et al., 2,3) Gutt and Russel 4) as well as Cavalier and SandreoDendon.5) Unfortunately, many liquidus temperatures are given as dotted lines. Disagreements between the phase diagram and the reality have been found by both the present research laboratory and the steel industry.6) Since ladle refining is very often operated at temperatures between 1 823 K and 1 923 K, the present communication aims at a study of a number of slag compositions to examine whether these slags are single liquids or multiphase mixtures at 1 858 K.While the differential thermal analysis (DTA) is well established to determine the temperature of phase transformation, the measurements of the liquidus temperatures of slags using this technique are difficult because of the invariable supercooling of the slags. The exothermic peak associated with the solid separation at the liquidus temperature occurs at much lower temperatures. During the heating mode, the compositional inhomogenities would result in considerable uncertainties. Hence, a quenching technique was employed in the present studyThe Al 2 O 3 , CaO, MgO and SiO 2 oxide powders were calicined at 1 073 K for 24 h before being thoroughly mixed in an agate mortar. The oxide mixtures were pressed into small pellets of about 1.3 g and sealed in a glass bottle. The bottle was kept in a desiccator before the experiment.A horizontal furnace was employed for most of the experiments. The experimental setup is schematically shown in Fig. 1. The furnace had KANTHAL SUPER 1800 (molybdenum silicide) heating elements with a maximum working temperature of 1 973 K. The furnace having an even temperature zone of 40 mm was controlled with an accuracy of Ϯ3 K by a programmable EORUTHERM 2408 P4 regulator using a Pt-30%Rh/Pt-6%Rh thermocouple. The alumina reaction tube had the dimensions of 60 mm o.d. and 50 mm i.d. Platinum crucibles were used to hold the samples. The crucibles were carefully shaped to avoid creeping-out of the slag during the experiments. An alumina holder was used to support two crucibles along with the samples. In a typical run, the samples on the alumina holder were carefully introduced into the reaction chamber and placed in the even temperature zone. Argon gas was passed through the reaction tube at low flow rate. A constant argon flow was maintained through out the experiment. The samples were heated up to 1 858 K and kept there for more than 5 h. After equilibration of the samples, the sample holder was rapidly pulled out of the furnace. After a quick visual examination, ...

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confidence: 98%

Characterization of Melting of Some Slags in the Al2O3–CaO–MgO–SiO2 Quaternary System

2006

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“…The previous data on the CaO-SiO 2 -Al 2 O 3 -MgO system [6][7][8] have been used in optimisation of thermodynamic software FactSage 6.2.…”

Section: Description Of the Pseudo-ternary Sectionmentioning

confidence: 99%

“…Our recent work 5) showed the significant differences of the phase diagrams in the Al 2 O 3 -CaO-MgOSiO 2 system from those reported in the early studies. [6][7][8] In addition, melilite solid solutions of Al 2 O 3 -CaO-MgO-SiO 2 system, in which industrial slags are operated, are important for optimisation of thermodynamic database. There are lack of melilite solid solution data reported previously.…”

Section: Introductionmentioning

confidence: 99%

Phase Equilibria Studies in the CaO–SiO2–Al2O3–MgO System with CaO/SiO2 Ratio of 1.10

Zhang

Zhao

et al. 2016

ISIJ International

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Phase equilibria and liquidus temperatures in the CaO-SiO 2 -Al 2 O 3 -MgO system with CaO/SiO 2 weight ratio of 1.10 have been experimentally determined by means of high temperature equilibration and quenching technique followed by electron probe X-ray microanalysis. Isotherms in the interval of 20 K between 1 613 and 1 733 K were determined in the primary phase fields of dicalcium silicate, wollastonite, merwinite, periclase, spinel and melilite that are relevant to ironmaking slags. Effects of Al 2 O 3 , MgO and CaO/SiO 2 ratio on the liquidus temperatures have been discussed to assist optimum operation of iron blast furnace. Compositions of the solid solutions corresponding to the liquidus have been accurately measured that will be used for development of the thermodynamic database.

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“…The oxide system CaO-SiO 2 -Al 2 O 3 -MgO forms a base for ironmaking slags. A series of pseudo-ternary phase diagrams sections in the system CaO-SiO 2 -Al 2 O 3 -MgO have been summarised in Slag Atlas 4) at fixed concentrations of Al 2 O 3 or MgO that are mainly based on the works reported by Osborn et al, 5) Gutt and Russel 6) and Cavalier and Sandrea-Deudon. 7) However, the isotherms reported were in 100 degrees interval and there are significant gaps in the composition range related to the ironmaking slags.…”

Section: Introductionmentioning

confidence: 99%

“…It has also been demonstrated in recent studies that significant differences are observed for the phase diagrams in the Al 2 O 3 -CaOMgO-SiO 2 system between the new results [8][9][10][11][12] and those reported in the early research. [5][6][7] On the other hand, solid solutions presented in the system Al 2 O 3 -CaO-MgO-SiO 2 , in particular melilite phase in which industrial slags are operated, are important for optimisation of the thermodynamic database. accurate phase equilibria data are of importance for both industrial and scientific interests.…”

Section: Introductionmentioning

confidence: 99%

Phase Equilibria in the CaO–SiO2–Al2O3–MgO System with CaO/SiO2 Ratio of 1.3 Relevant to Iron Blast Furnace Slags

Wang

et al. 2015

ISIJ International

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Studies of the system CaO-SiO2-Al2O3-MgO in relation to the stability of blastfurnace slag

Cited by 25 publications

References 12 publications

Characterization of Melting of Some Slags in the Al2O3–CaO–MgO–SiO2 Quaternary System

Characterization of Melting of Some Slags in the Al2O3–CaO–MgO–SiO2 Quaternary System

Phase Equilibria Studies in the CaO–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub>–MgO System with CaO/SiO<sub>2</sub> Ratio of 1.10

Phase Equilibria in the CaO–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub>–MgO System with CaO/SiO<sub>2</sub> Ratio of 1.3 Relevant to Iron Blast Furnace Slags

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