Phase Equilibria and Phase Diagrams of the Mn2+, Mg2+, NH4+//SO42–H2O System at 298.15, 323.15, and 373.15 K

2020 ◽  
Vol 65 (6) ◽  
pp. 3091-3102 ◽  
Author(s):  
Min Zhang ◽  
Peng Wu ◽  
Yaoyao Li ◽  
Wenxuan Li ◽  
Huan Zhou
Keyword(s):  
Phase Equilibria ◽  
Phase Diagrams

Phase Equilibria in a Liquid Metal of Fe-La-Ce-O System at 1600 °С

2020 ◽  
Vol 299 ◽  
pp. 468-474 ◽  
Author(s):  
Gennady G. Mikhailov ◽  
L.A. Makrovets ◽  
O.V. Samoilova
Keyword(s):  
Rare Earth ◽  
Liquid Metal ◽  
Phase Equilibria ◽  
Phase Diagrams ◽  
Liquid Iron ◽  
Rare Earth Metals ◽  
Liquid Oxygen ◽  
Oxide Systems ◽  
Calculation Technique ◽  
Steelmaking Technology

Thermodynamic modeling of phase equilibria in a liquid metal of Fe–La–Ce–O system at 1600 °С, using the technique of constructing the solubility surfaces for the components of a metal, was carried out. The calculation technique allowed assessing the depth of liquid iron de-oxidation at a complex use of lanthanum and cerium as deoxidizing agents. Also, diagrams of de-oxidants’ consumption for one ton of liquid oxygen-containing iron were calculated in the course of the work. Carrying out a calculation of the solubility surfaces for the components of a metal required simulation of phase diagrams of the following oxide systems: FeO–La2O3–Ce2O3, FeO–CeO2–La2O3, CeO2–La2O3–Ce2O3. The obtained results might be of interest for optimization of the use of rare-earth metals in steelmaking technology.

Phase Chemistry and Thermal Chemistry on the Calcium-Containing Brine Systems

2014 ◽  
Vol 1015 ◽  
pp. 405-408
Author(s):  
Bai Hui Bu ◽  
Fei Li ◽  
Ya Fei Guo ◽  
Shi Qiang Wang ◽  
Tian Long Deng
Keyword(s):  
Phase Equilibria ◽  
Phase Diagrams ◽  
Salt Lake ◽  
Comprehensive Utilization ◽  
Thermal Chemistry ◽  
The World ◽  
The Future ◽  
Phase Chemistry

It is well known that phase equilibria and phase diagrams can successfully guide the comprehensive utilization of the salt lake resources. The researches on phase chemistry and thermal chemistry of the calcium-containing brine system are essential to promote the development of brines. In this paper, the progresses on the phase chemistry and thermal chemistry of the calcium-containing brine system around the world from 2007 up to now were summarized. The problems existed and the new trends in the future were also carried out.

scholarly journals Phase Equilibria and Phase Diagrams for the Ternary Aqueous System Containing Lithium, Sodium, and Pentaborate Ions at 298.15 and 323.15 K and 101.325 kPa

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Panpan Li ◽  
Kaiyu Zhao ◽  
Shangqing Chen ◽  
Jiayin Hu ◽  
Yafei Guo ◽  
...  
Keyword(s):  
Refractive Index ◽  
Ternary System ◽  
Phase Equilibria ◽  
Phase Diagrams ◽  
Invariant Point ◽  
Aqueous System ◽  
Eutectic Type ◽  
Two Temperatures ◽  
Sodium Pentaborate Pentahydrate ◽  
Experimental Values

Phase equilibria and phase diagrams for the ternary aqueous system containing lithium, sodium, and pentaborate ions at 298.15 and 323.15 K and 101.325 kPa were investigated by the methods of isothermal dissolution equilibrium. From the experimental data, the phase diagrams and the diagrams of physicochemical properties versus composition of lithium pentaborate in the equilibrium systems were plotted, respectively. The phase diagrams of the ternary system LiB5O8 + NaB5O8 + H2O at two temperatures contain one invariant point, two univariant curves, and two crystallization regions corresponding to sodium pentaborate pentahydrate (NaB5O8·5H2O) and lithium pentaborate pentahydrate (LiB5O8·5H2O). Due to the different dissolution behaviors of pentaborate salts in the aqueous systems, the component of LiB5O8 has a relatively strong effect on the solubility of NaB5O8. It was found that this system belongs to a simple eutectic type at two temperatures, and neither double salts nor solid solutions were formed. The densities and refractive indices in the ternary system at 298.15 and 323.15 K are as similar as changing regularly with the increase of LiB5O8 concentration. On the basis of empirical equations of the density and refractive index in electrolytes, the calculated values of density and refractive index agreed well with the experimental values at two temperatures.

Stable and Metastable Phase Equilibria of the Lithium-Containing Salt-Water Systems

2014 ◽  
Vol 1015 ◽  
pp. 401-404
Author(s):  
Long Li ◽  
Dao Lin Gao ◽  
Jiang Ping Zeng ◽  
Ya Fei Guo ◽  
Tian Long Deng
Keyword(s):  
Phase Equilibria ◽  
Phase Diagrams ◽  
Salt Lake ◽  
Salt Water ◽  
Metastable Phase ◽  
Water Systems ◽  
Strategic Resources ◽  
The Future ◽  
Salt Lake Brine

Salt lake brine resource is one of the strategic resources in the western of China. Phase equilibria and phase diagrams are the theoretic foundation for the exploitation of salt lake brine resources. Hence, studies for the stable and metastable phase equilibria of lithium-containing salt-water systems are of the great importance for the development of salt lake brine resources. In this paper, the stable and metastable phase equilibria of lithium-containing salt-water systems were summarized, and the problems existed at present and the new trends in the future are also discussed.

Evaluation of the Thermodynamic Properties and Phase Equilibria of the Ordered γ’ and Disordered γ Phases in the Ni-Al-Ta System

2002 ◽  
Vol 755 ◽  
Author(s):  
Shihuai Zhou ◽  
Long-Qing Chen ◽  
Rebecca A. MacKay ◽  
Zi-Kui Li u
Keyword(s):  
Experimental Data ◽  
Thermodynamic Properties ◽  
Gibbs Energy ◽  
Phase Equilibria ◽  
Phase Diagrams ◽  
Gibbs Energy Function ◽  
Ternary Interaction ◽  
Two Phases ◽  
Rich Side ◽  
Good Agreement

ABSTRACTThe phase equilibria and thermodynamic properties of the ternary Ni-Al-Ta system on Ni-rich side were analyzed. Thermodynamic descriptions of the liquid, γ-fcc, γ'-L12, and π-Ni6AlTa phases were obtained using the CALPHAD (CALculation of PHase Diagrams) technique. The thermodynamics of γ-fcc and γ'-L12 phases were modeled with a single Gibbs energy function taking into account the crystallographic relation between the two phases. The ternary interaction parameters of the liquid and fcc phases were also determined. The calculated phase diagrams of the ternary Ni-Al-Ta system show a good agreement with experimental data.

THE SYSTEM KOH–K2CO3–H2O AT LOW TEMPERATURES: I. PHASE EQUILIBRIA

1958 ◽  
Vol 36 (7) ◽  
pp. 1064-1069 ◽  
Author(s):  
A. A. Lang ◽  
A. J. Sukava
Keyword(s):  
Phase Equilibria ◽  
Phase Diagrams ◽  
Potassium Carbonate ◽  
Low Temperatures ◽  
Potassium Hydroxide ◽  
Compound Formation

Phase diagrams for the system KOH–K2CO3–H2O were determined for 25°, 10°, 0°, −10°, −20°, −40°, and −60°. The stable hydrates of potassium hydroxide were the di- and tetra-hydrates; those of potassium carbonate were the sesqui- and hexa-hydrates. No compound formation between KOH and K2CO3 was detected.

Thermodynamic Modeling of Phase Equilibria in the FeO-MgO-Al2O3 System

2020 ◽  
Vol 989 ◽  
pp. 3-9 ◽  
Author(s):  
O.V. Samoilova ◽  
L.A. Makrovets
Keyword(s):  
Experimental Data ◽  
Phase Equilibria ◽  
Phase Diagrams ◽  
Thermodynamic Modeling ◽  
Thermodynamic Stability ◽  
Thermodynamic Model ◽  
Liquidus Surface ◽  
Melt Temperature ◽  
Oxide Melt ◽  
Solid Phases

Thermodynamic modeling of coordinates of phase diagrams’ liquidus lines of the FeO–MgO, FeO–Al2O3, MgO–Al2O3 systems and coordinates of phase diagram’s liquidus surface of the FeO–MgO–Al2O3 system has been carried out. In the course of work, a thermodynamic model which describes activity of oxide melt had been selected for each of the systems; energy parameters of the model have been determined. Regions of thermodynamic stability of solid phases which are at equilibrium with the oxide melt have been determined. Results of the modeling have been compared with experimental data existing in the literature. Modeling technique has also allowed evaluating enthalpies and entropies of FeAl2O4 and MgAl2O4 compounds’ formation out of components of the oxide melt. The obtained results are of interest for steelmaking industry processes when determining the melt temperature of a slag containing oxides of iron, magnesium and aluminum.

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