Thermodynamics of Na2O in the molten CaO-CaF2-SiO2 system

Kimura, Hisao; Tsukihashi, Fumitaka; Sano, Nobuo

doi:10.1007/bf02653873

Cited by 2 publications

(3 citation statements)

References 11 publications

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“…Similar investigations were already made to determine aNa20 in the systems Pb-NazO-SiO z [2], Pb-NazO-CaO-CaFz-SiOz [3] and Ag-NazO-Bz03 [4].…”

Section: Activity Of Na20 In Synthetic Blast Furnace Type Slagsmentioning

confidence: 54%

“…The phases and phase compositions are determined with respect to the free energies. The thermochemical data used for the calculations are taken from a data file 8044B09G.dat [3], table 3. Figure 5 illustrates the fairly reliable log aNa20 -X N a2 0 correlation for NazO-SiO z slags at 1300°C calculated from the Gaye model as compared with the present and several reference works [2,6,[10][11][12].…”

Section: Activity Of Na20 In Synthetic Blast Furnace Type Slagsmentioning

confidence: 99%

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Experimental Studies of the Alkali Behaviour in Blast Furnace Type Slags

Ivanov

Savov

Janke

2004

steel research international

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In a preceding paper, existing data on the chemical behaviour of alkali compounds and their influence on physical properties of SF slags as well as on materials circulation in the SF operations were critically reviewed. In the present work, new investigations based on fundamental experiments and thermochemical modelling are introduced. They have been focused on the determination of both chemical activity of Na20 and kinetics of Na20 and K20 evaporation from SF-type slags. The results for the activities BNa20 agree fairly well with data obtained from calculation based on the slag model of H. Gaye which seems generally suitable to predict chemical activities in molten slags. Kinetics of alkali evaporation from SF-type slags follow a first-order reaction. The rate constants for K 20 are remarkably higher than those for Na20. Alkali evaporation is enhanced with decreased %(CaO)/%(Si02) ratio and lower AI 203 content and is increased with temperature. It is further favoured under reducing conditions in the absence of iron oxide in the slag.

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“…Similar investigations were already made to determine aNa20 in the systems Pb-NazO-SiO z [2], Pb-NazO-CaO-CaFz-SiOz [3] and Ag-NazO-Bz03 [4].…”

Section: Activity Of Na20 In Synthetic Blast Furnace Type Slagsmentioning

confidence: 54%

Section: Activity Of Na20 In Synthetic Blast Furnace Type Slagsmentioning

confidence: 99%

Experimental Studies of the Alkali Behaviour in Blast Furnace Type Slags

Ivanov

Savov

Janke

2004

steel research international

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“…14,15) On the other hand, Niekerk and Dippenaar 15) reported that the CaF 2 (10-35 mass%) decreased the sulfide capacity of the CaOSiO 2 -CaF 2 slags containing 5-15 mass% Na 2 O due to its dilution effect. Thus, in the present study, the effects of (Յ2 mass%) Na 2 O and CaF 2 on the carbide capacities of the CaO-SiO 2 -CaF 2 -Na 2 O slags saturated with CaO or Ca 2 SiO 4 has been investigated.…”

Section: Effect Of Na 2 O and Caf 2 On Carbide Capacitymentioning

confidence: 99%

Carbide Capacity of CaO-SiO2-CaF2(-Na2O) Slags at 1773 K

Park

Min

2004

ISIJ International

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The influence of CaF 2 , Na 2 O, and basicity on the solubility of carbon in the CaO-SiO 2 -CaF 2 -Na 2 O slag at 1 773 K was investigated on the basis of carbide capacity concept. The carbide capacity of the CaO satdSiO 2 -CaF 2 system increases with increasing CaF 2 content up to about 40 mass%, followed by nearly constant value. The capacity of the slags saturated with Ca 2 SiO 4 also increases with increasing the content of CaF 2 and this trend can be explained from the depolymerization reaction of silicate network by F Ϫ ions. The carbide capacity of the slags increases by increasing the ratio of (%CaF 2 )/(%SiO 2 ) up to about 0.8, followed by slight increase or nearly constant value at a fixed CaO content. The capacity also increases by increasing the ratio of (%CaO)/(%SiO 2 ) at a fixed CaF 2 content. The carbide capacity of the Na 2 O-containing slags linearly increases with increasing the basicity, B (ϵ{(%CaO)ϩ(%Na 2 O)}/(%SiO 2 )) and the dependence of the capacity on the basicity decreases by increasing the CaF 2 content. On the other hand, the capacity decreases with increasing CaF 2 content at basicity, B of the slags greater than about 2.0 and vice versa in the composition of BՅ2.0. The capacity of the slags containing CaF 2 and Na 2 O could quantitatively be described by the activity of CaO rather than optical basicity.

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Thermodynamics of Na2O in the molten CaO-CaF2-SiO2 system

Cited by 2 publications

References 11 publications

Experimental Studies of the Alkali Behaviour in Blast Furnace Type Slags

Experimental Studies of the Alkali Behaviour in Blast Furnace Type Slags

Carbide Capacity of CaO-SiO2-CaF2(-Na2O) Slags at 1773 K

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