An assessment of the CaO-SiO2 system

Hillert, Mats; Sundman, Bo; Wang, Xizhen

doi:10.1007/bf02664198

Cited by 83 publications

(47 citation statements)

References 18 publications

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“…According to literature, [10,11] for the involved binaries Nd 2 O 3 -SiO 2 and CaO-SiO 2 at 1773 K and 1873 K (1500°C and 1600°C), three incongruently melting compounds, namely C 3 S, Nd 2 SiO 5 , and Nd 2 Si 2 O 7 , and three congruently melting compounds, namely Nd 9.33 (SiO 4 ) 6 O 2 , C 2 S and CS, exist. This study confirmed the presence of these binary Nd 2 O 3 -SiO 2 compounds as seen in Figure 4.…”

Section: Binary Systemsmentioning

confidence: 98%

“…The CaO-SiO 2 and SiO 2 -Nd 2 O 3 binary subsystems were investigated elsewhere. [10,11] Although several phase diagrams of the CaO-RE x O y family (RE = La, Dy, Y, Gd, Pr) have been studied for decades, [12] the binary CaO-Nd 2 O 3 has only been studied to some extent recently. [13] There are only few studies on solid state equilibrium of CaO-Nd 2 O 3 -SiO 2 ternary system reported in late 60s and 70s, [14,15] neither data nor information of solid solution solubility or the liquidus have been found.…”

Section: Introductionmentioning

confidence: 99%

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Phase Relations of the CaO-SiO2-Nd2O3 System and the Implication for Rare Earths Recycling

Malfliet

Blanpain

et al. 2016

Metall Mater Trans B

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slags were equilibrated at 1773 K and 1873 K (1500°C and 1600°C) for 24 hours in Ar, and quenched in water to determine the operative phase relations. The composition and crystallinity of the phases in equilibrium were determined by EPMA-WDS and EBSD, respectively. Based on these analyses, the liquid stability region was accurately determined, and a large part of the isothermal section of the phase diagram was constructed. Data resulting from this work can be used to generate a thermodynamic database for rare-earth oxide-containing systems and to support further investigation on separation of rare earths from metallurgical slags or other residues through high-temperature processing.

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Section: Binary Systemsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Phase Relations of the CaO-SiO2-Nd2O3 System and the Implication for Rare Earths Recycling

Malfliet

Blanpain

et al. 2016

Metall Mater Trans B

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“…To date, MTDATA has been used to examine the cellular model of Kapoor and Frohberg (5) using data of Gaye and Welfringer (8) supplemented by our own assessments, and the variable-site-sublattice model in cooperation with the group at the Royal Institute of Technology in Stockholm. Some of the data used in the work reported here were converted from assessments undertaken at Stockholm (9). Despite the large number of possible coefficients, an advantage of the associate model is that it is easy to gain a feel for the data by determining, for example, which associates make the greatest contribution to the Gibbs energy.…”

Section: Oxide Systemsmentioning

confidence: 99%

Application of MTDATA to the Modeling of Multicomponent Equilibria

Davies

Dinsdale

Chart

et al. 1990

Materials Chemistry at High Temperatures

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MTDATA embodies the principle that equilibria in multicomponent, multiphase systems can be calculated from a knowledge of the thermodynamic data for the subsystems. A number of modules are incorporated for manipulating and retrieving the data, making various types of calculation and plotting binary, ternary, multicomponent, and predominance area diagrams. The principles and operation of MTDAT A are illustrated by reference to systems of practical importance.

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“…Each has its advantages and disadvantages. The UPIM, [1][2][3][4][5] regular solution model, [8,9,10] associated solution model, [11][12][13][14][15][16] two-sublattice model, [17,18,19] polymerization model, [20][21][22][23][24] modified quasichemical model, [25][26][27][28][29][30][31][32][33] and cell model [34][35][36][37][38][39][40] are reviewed later, and their applicability to ferromanganese metal and slag phases is discussed.…”

Section: Review Of Thermodynamic Modelsmentioning

confidence: 99%

Thermodynamic model for MnO-containing slags and gas-slag-metal equilibrium in ferromanganese smelting

Morris

Robertson

1998

Metall Mater Trans B

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The thermodynamics of MnO-containing slags was reviewed, and the properties of such slags were correlated by application of the cell model. This model, together with a previously developed unified interaction parameter model for the metal phase, was used to simulate the gas-slag-metal conditions in the hearth of a ferromanganese submerged arc furnace. The calculated slag and metal compositions and distribution of Mn, Si, and K between slag, metal, and fume were compared with plant data and satisfactory agreement was obtained. A steady recirculation of potassium inside the furnace was also predicted. For a potassium percentage in the raw materials of 0.63 pct, the amount of the recirculating potassium was about 160 kg per metric ton of ferromanganese. Due to the recirculation, the average potassium content in the solid mix coming down to the hearth could be as high as 7 pct.

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An assessment of the CaO-SiO2 system

Cited by 83 publications

References 18 publications

Phase Relations of the CaO-SiO2-Nd2O3 System and the Implication for Rare Earths Recycling

Phase Relations of the CaO-SiO2-Nd2O3 System and the Implication for Rare Earths Recycling

Application of MTDATA to the Modeling of Multicomponent Equilibria

Thermodynamic model for MnO-containing slags and gas-slag-metal equilibrium in ferromanganese smelting

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