scholarly journals Effects of Al2O3 on Phase Equilibria in the Olivine Primary Phase Field of the MgO-"FeO"-SiO2-Al2O3 System in Equilibrium with Metallic Iron

2005 ◽  
Vol 45 (8) ◽  
pp. 1101-1105 ◽  
Author(s):  
Shengqi CHEN ◽  
Evgueni JAK ◽  
Peter C. HAYES
Keyword(s):  
Phase Equilibria ◽  
Phase Field ◽  
Metallic Iron ◽  
Primary Phase ◽  
Primary Phase Field

scholarly journals Liquidus and phase equilibria in CaO-Al2O3-FeOx-SiO2 system under intermediate oxygen partial pressure

2013 ◽  
Vol 49 (2) ◽  
pp. 139-144
Author(s):  
N. Wang ◽  
M. Chen ◽  
Z. Zou ◽  
Z. Zhang ◽  
Y. Xiao ◽  
...  
Keyword(s):  
Phase Equilibria ◽  
Phase Field ◽  
Slag System ◽  
Rapid Quenching ◽  
Primary Phase ◽  
Copper Smelting ◽  
Primary Phase Field ◽  
Atmospheric Conditions ◽  
Wide Range ◽  
Liquidus Temperatures

Phase equilibria of silicate slags relevant to the copper smelting/converting operations have been experimentally studied over a wide range of slag compositions, temperatures and atmospheric conditions. Selected systems are of industrial interest and fill the gaps in fundamental information required to systematically characterise and describe copper slag chemistry. The experimental procedures include equilibration of synthetic slag at high temperatures, rapid quenching of resulting phases, and accurate measurement of phase compositions using electron probe X-ray microanalysis (EPMA). The effects of CaO, Al2O3 and MgO on the phase equilibria of this slag system have been experimentally investigated in the temperature range 1200 to 1300 oC and oxygen partial pressures between 10-5 and 10-9 atm. It was found that spinel and silica are major primary phases in the composition range related to copper smelting/converting slags. In addition, olivine, diopside and pyroxene also appear at certain conditions. The presence of CaO, MgO and Al2O3 in the slag increases the spinel liquidus and decreases the silica liquidus. Liquidus temperatures in silica primary phase field are not sensitive to Po2; Liquidus temperatures in spinel primary phase field increase with increasing Po2. At 1300?C and low Po2, the spinel (Fe2+,Mg2+)O.(Al3+,Fe3+) primary phase field can be replaced by wustite (Fe2+,Mg2+)O.

scholarly journals Effects of CaO, Al2O3 and MgO on liquidus temperatures of copper smelting and converting slags under controlled oxygen partial pressures

2013 ◽  
Vol 49 (2) ◽  
pp. 153-159 ◽  
Author(s):  
B. Zhao ◽  
P. Hayes ◽  
E. Jak
Keyword(s):  
Phase Equilibria ◽  
Phase Field ◽  
Rapid Quenching ◽  
Primary Phase ◽  
Copper Smelting ◽  
Primary Phase Field ◽  
Atmospheric Conditions ◽  
Partial Pressures ◽  
Wide Range ◽  
Liquidus Temperatures

Phase equilibria of silicate slags relevant to the copper smelting/converting operations have been experimentally studied over a wide range of slag compositions, temperatures and atmospheric conditions. Selected systems are of industrial interest and fill the gaps in fundamental information required to systematically characterise and describe copper slag chemistry. The experimental procedures include equilibration of synthetic slag at high temperatures, rapid quenching of resulting phases, and accurate measurement of phase compositions using electron probe X-ray microanalysis (EPMA). The effects of CaO, Al2O3 and MgO on the phase equilibria of this slag system have been experimentally investigated in the temperature range 1200 to 1300 oC and oxygen partial pressures between 10-5 and 10-9 atm. It was found that spinel and silica are major primary phases in the composition range related to copper smelting/converting slags. In addition, olivine, diopside and pyroxene also appear at certain conditions. The presence of CaO, MgO and Al2O3 in the slag increases the spinel liquidus and decreases the silica liquidus. Liquidus temperatures in silica primary phase field are not sensitive to Po2; Liquidus temperatures in spinel primary phase field increase with increasing Po2. At 1300 oC and low Po2, the spinel (Fe2+,Mg2+)O.(Al3+,Fe3+) primary phase field can be replaced by wustite (Fe2+,Mg2+)O.

Viscosity of Spinel Primary Phase Field Slags from Australian Brown Coals

2020 ◽  
Vol 34 (3) ◽  
pp. 3041-3056 ◽  
Author(s):  
Alexander Ilyushechkin ◽  
Alex Kondratiev ◽  
Chong He ◽  
Jin Bai ◽  
Xiaodong Chen ◽  
...  
Keyword(s):  
Phase Field ◽  
Primary Phase ◽  
Primary Phase Field ◽  
Brown Coals

Effect of Ag on the primary phase field of the high-Tc (Bi,Pb)-2223 superconductor

2000 ◽  
Vol 15 (2) ◽  
pp. 296-305 ◽  
Author(s):  
W. Wong-Ng ◽  
L. P. Cook ◽  
W. Greenwood ◽  
A. Kearsley
Keyword(s):  
Phase Field ◽  
Volume Fraction ◽  
Primary Crystallization ◽  
Primary Phase ◽  
Crystallization Field ◽  
Primary Phase Field ◽  
Liquidus Data ◽  
Primary Crystallization Field ◽  
High Tc ◽  
Melt Composition

The subsolidus equilibria and the primary phase field (crystallization field) of the 110 K high-Tc (Bi,Pb)-2223 ([Bi,Pb]:Sr:Ca:Cu) phase have been determined in the presence of Ag under a 92.5% Ar/7.5% O2 atmosphere (volume fraction). A total of 29 six-phase volumes that include both the (Bi,Pb)-2223 and Ag phases was observed. These subsolidus volumes are similar to those observed without the presence of Ag. The compositional range of initial melts of these volumes (mole fraction basis) covers BiO1.5 from 5.6% to 25.3%, PbO from 0.4% to 13.8%, SrO from 8.4% to 31.9%, CaO from 12.2% to 33.3%, CuO from 21.7% to 40.9%, and AgO0.5 from 1.2% to 6.3%. Based on these data, the primary crystallization field for the (Bi,Pb)-2223 phase in the presence of Ag was constructed using the convex hull technique. A section through this “volume” was portrayed by holding the AgO0.5, SrO, and CaO components at the median value of the 29 compositions while allowing projection on the other three axes (BiO1.5, PbO, and CuO). The net effect of Ag on the melt composition is a reduction in the PbO concentration and an increase in the SrO content. Applications of the liquidus data are also discussed.

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