scholarly journals STRUCTURE OF THE PHASE COMPLEX OF THE SYSTEM K,Mg,Ca||SO4,Cl-H2O AT 0°C

2021 ◽  
Vol 73 (1) ◽  
pp. 142-150
Author(s):  
L. Soliev ◽  
◽  
M. T Jumaev ◽  
I. O. Fritskiy ◽  
◽  
...  
Keyword(s):  
Phase Equilibria ◽  
Translation Method ◽  
Phase Complex ◽  
Invariant Points ◽  
Solid Phases

The translation method predicted phase equilibria on geometric images of the system K,Mg,Ca||SO4,Cl-H2O at 00 C. It was found that at 0 °C the studied system is characterized by the presence of 6 invariant points, 18 monovariant curves and 15 divariant fields. Based on the data obtained, a diagram of the phase complex of the K,Mg,Ca||SO4,Cl-H2O at 0°C and fragmented by divariant fields, as well as crystallization fields of individual equilibrium solid phases, was constructed.

scholarly journals PHASE EQUILIBRIA IN SYSTEM K,Са//SO4,HCO3,F-H2O AT 25 °C

2018 ◽  
Vol 61 (3) ◽  
pp. 26
Author(s):  
I. Jabborov ◽  
L. Soliev ◽  
I. Nizomov ◽  
J. Musodzonova
Keyword(s):  
Phase Diagram ◽  
Phase Equilibria ◽  
Reciprocal System ◽  
Component Composition ◽  
Scientific Data ◽  
Translation Method ◽  
Phase Rule ◽  
Component System ◽  
Component Systems ◽  
Phase Complex

The article describes a study on the identification of possible phase equilibria in mutual geometrical images of five-component system of water and salt from sulfates, bicarbonates, potassium and calcium fluoride at 25 °C, followed by the construction of its phase diagram complex. Knowledge of the laws governing the structure of the phase complex of this system is necessary not only to obtain new scientific data as reference material, but also to contribute to the creation of optimal conditions for the utilization of liquid wastes of aluminum industrial production containing the system of salts that make up this system. To solve the problem, we used the translation method, which is based on the position according to which the dimension of the geometric images of the diagram of the original (private) system increases by one by adding a subsequent component, due to its concentration, i.e. are transformed. Since the investigated five-component system consists of five particular four-component systems, the addition of the fifth component to any of them is accompanied by transformations of the geometric images of all five four-component systems. Transformed geometric images according to their topological properties are broadcasted to the level of a five-component composition. At the level of the five-component composition, the transformed geometric images, in accordance with the Gibbs phase rule, intersect each other forming geometric images of a given level of componentness. Investigation of phase equilibria five-component water-salt reciprocal system of sulfates, bicarbonates, potassium and calcium fluorides and construction of its phase diagram with complex translation method (at 0°C) showed that it is characterized by fifteen divariant fields, thirteen monovariant curves, and four invariant points. On the basis of the obtained data, the complete closed phase diagram of the investigated system was constructed for the first time and, for the convenience of its reading, it is fragmented by the regions of divariant equilibria.Forcitation:Jabborov I., Soliev L., Nizomov I., Musodzonova J. Phase equilibria in system K,Са//SO4,HCO3,F-H2O at 25 °C. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 3. P. 26-30 

scholarly journals Phase complex of the system Na,Ca||SO4,CO3,HCO3-H2O at 100 ºC

2020 ◽  
Vol 7 (2) ◽  
pp. 71-80
Author(s):  
L. Soliev ◽  
M. T. Jumaev
Keyword(s):  
Reference Material ◽  
Phase Equilibria ◽  
Industrial Production ◽  
Liquid Waste ◽  
Scientific Data ◽  
Salt System ◽  
Optimal Conditions ◽  
Phase Complex ◽  
Water Salt ◽  
Invariant Points

The article discusses the results of determining the possible phase equilibria in geometric images of a five-component reciprocal water-salt system of sulfates, carbonates, sodium bicarbonates and calcium at 100 ºC with subsequent construction of its phase complex diagram. The laws that determine the structure of the phase complex diagram of this system are needed to be obtained for the production of scientific data used both as a reference material and also to create the optimal conditions for the recycling of liquid waste industrial production of aluminum-containing sulfate carbonate and bicarbonate salts of sodium and calcium. It was established that the system under study at 100ºC is characterized by the presence of 31 divariant double saturation fields, 25 monovariant  trisaturation curves and 14 invariant points.

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.

Phase equilibria and mixed parageneses of metabasites in lowgrade metamorphism

1985 ◽  
Vol 49 (352) ◽  
pp. 321-333 ◽  
Author(s):  
J. G. Liou ◽  
S. Maruyama ◽  
M. Cho
Keyword(s):  
Phase Equilibria ◽  
Model System ◽  
Metamorphic Grade ◽  
Low Grade ◽  
Qualitative And Quantitative ◽  
Basaltic Rocks ◽  
Mineral Assemblages ◽  
The Common ◽  
Invariant Points ◽  
Model Phase

AbstractThe system Na2O-CaO-MgO Al2O3-SiO2-H2O is proposed to model phase equilibria and mineral parageneses for low-temperature metamorphism of basaltic rocks. Univariant reactions marking the transitions between various sub-greenschist facies are identified and some have been experimentally determined. The introduction of Fe2O3 into the model system at fixed FeO/MgO ratio creates continuous reactions for facies boundaries and discontinuous reactions for invariant points of the model system. Both qualitative and quantitative effects on P-T displacement and phase compositions are discussed. The XFe3+ isopleths for epidote were plotted to exemplify the transition from the zeolite through prehnite-pumpellyite to prehnite-actinolite facies. T-XFe3+ relations were established for continuous and discontinuous reactions relating such facies transitions. Because of the common occurrence of two or three Ca-Al hydrosilicates in low-grade metabasites, an isobaric Al-Ca-Fe3+ projection from chlorite may be used to illustrate mineral assemblages and compositions of the coexisting Ca-Al silicates in the presence of quartz, albite, and chlorite. Reported occurrences in several classic burial metamorphic terrains and ocean-floor metabasites in ophiolites are described. Only the composition of a mineral from a buffered assemblage can constrain the intensive properties for metamorphism; previously reported compositional trends for pumpellyite and epidote with increasing metamorphic grade are oversimplified.

scholarly journals Solid-liquid phase equilibria in the ternary systems H2O+ZnCl2+NaCl at temperatures of 298, 313 and 333 K

2021 ◽  
pp. 53-53
Author(s):  
Sevilay Demirci ◽  
Vedat Adiguze ◽  
Omer Sahin
Keyword(s):  
Liquid Phase ◽  
Phase Equilibria ◽  
Solid Phase ◽  
Ternary Systems ◽  
Viscosity Data ◽  
Isothermal Method ◽  
Chloride Water ◽  
Solid Phases ◽  
Solid Liquid ◽  
Liquid And Solid Phases

In this study, an economic separation method was suggested with the use of phase equilibria in order to ensure the recycling of ZnCl2 whose industrial waste amount is very high and to prevent it to form an environmental pollution. Sodium chloride-zinc chloride-water systems were examined with the isothermal method at temperatures of 298, 313 and 333 K. The analyses of the liquid and solid phases were used to determine the composition of the solid phase using the Schreinemakers graphic method. The solid-liquid phase equilibrium and viscosity data belonging to all ternary systems were identified and the solubility and viscosity changes with temperature were compared. The viscosity values were inversely proportional to the temperature as the amount of ZnCl2 in the solution increased. NaCl, 2NaCl ZnCl2 nH2O (n: 2, 0), ZnCl2 salts were observed at 298, 313, 333 K in the solid phases which are at equilibrium with the liquid phase at the invariant point.

scholarly journals PHASE EQUILIBRIA IN THE NaCl–CaCl2–CaO SYSTEM

2021 ◽  
Vol 87 (2) ◽  
pp. 77-86
Author(s):  
Anatoliy Omelchuk ◽  
Igor Skryptun ◽  
Nikolay Zakharchenko ◽  
Olha Bosenko ◽  
Ruslan Savchuk ◽  
...  
Keyword(s):  
Ternary System ◽  
Phase Equilibria ◽  
Metal Oxides ◽  
Calcium Oxide ◽  
Refractory Metal ◽  
Polythermal Section ◽  
X Ray ◽  
Polythermal Sections ◽  
Solid Phases ◽  
Liquid And Solid Phases

The phase equilibria of the ternary system CaCl2 – NaCl – CaO in the area which enriched of calcium and sodium chloride were investigated by the methods of differential-thermal analysis and powder X-ray phase analysis. In the systems were determined the equilibrium concentration of calcium oxide and the composition of the phases, which at the same time exist in an equilibrium state at different temperatures. The surfaces of liquidus and solidus were established, the compositions of the sections of the ternary system CaCl2–NaCl–CaO were defined, which recommended for electrochemical reduction of refractory metal oxides (titanium, zirconium and other), which allow electrolysis in the temperature range from 550 to 1000 °С. Five polythermal sections of the NaCl – CaCl2 – CaO ternary system were studied. For each polythermal section the regions of existence of the liquid and solid phases were established. For each polythermal section state diagrams were constructed. Used X-Ray phase analyses it was established the compositions of liquid and solid phases for each polythermal sections. The phases of which the system consists were determined. At a constant ratio of components [NaCl]:[CaCl2] = 1.06 (mol.) in the melts of the ternary system CaCl2 – NaCl – CaO, the equilibrium content of calcium oxide reaches 12.0 mol.%, while their crystallization temperature does not exceed 550 °C. This allows us to recommend mixtures of this composition for electrochemical reduction of refractory metal oxides in a wide range of temperatures (from 550 to 1000 °C) with a high content of both calcium and sodium chlorides (not less than 40 mol.%) and oxide. calcium (up to 12.0 mol.%). The eutectic of this ternary system has a melting point of 480 ° C and corresponds to he composition (mol.%): CaCl2 (45.8) – NaCl (47.0) – CaO (7.2).

scholarly journals Phase complex model of ternary reciprocal system Na+,Sr2+||WO42-,MoO42-

2019 ◽  
Vol 59 (8) ◽  
pp. 103-115
Author(s):  
Alexander V. Burchakov ◽  
Keyword(s):  
Phase Equilibria ◽  
Solid Solutions ◽  
Binary Systems ◽  
Reciprocal System ◽  
Condensed State ◽  
Continuous Series ◽  
Algebraic Equations ◽  
Reaction Products ◽  
System Components ◽  
Phase Complex

The paper presents the results of a theoretical study of the phase complex of a three-component reciprocal system consisting of sodium and strontium tungstates and molybdates. Previously, a literature review was conducted on data on phase equilibria in the condensed state of individual salts, binary faceting systems. In two Na2MoO4 – SrMoO4 and Na2WO4 – SrWO4 binary systems, a eutetic equilibrium is observed with the formation of solid phases corresponding to the system components, and in two other Na2MoO4 – Na2WO4 and SrMoO4 – SrWO4 binary systems, one phase of a continuous series of solid solutions crystallizes. Based on the mathematical model of the molar balance, one can uniquely determine the quantities of reaction products, the molecular formulas of solid solutions, and the equations of chemical reactions for an arbitrary mixture of system components. This model represents a set of algebraic equations by which the balance is calculated. To build a 3D computer model, the paper presents the equations for the conversion of coordinates from barycentric to Cartesian. The model is implemented in concentration-temperature coordinates using the KOMPAS-3D program using experimental data on the system. The model is built in two interpretations: based on data on the faceting elements and on the basis of all available data about the system. Comparison of the two models makes it possible to evaluate the predictive ability carried out using 3D modeling. From this comparison, it was found that using the 3D model it is possible to conduct a preliminary a priori forecast of phase equilibria in order to identify the structure of phase diagrams at the qualitative and quantitative levels. The projection of the crystallization polytherm onto the square of the compositions is represented by two fields of solid solutions – Na2MoxW1-xO4 and SrMoxW1-xO4. Isothermal and polythermal sections were constructed. The system implements di- and monovariant equilibria.

THE FIVE-COMPONENT SYSTEM: LITHIUM–SODIUM–POTASSIUM–SULPHATE–CHLORIDE–WATER, AT 25 °C

1961 ◽  
Vol 39 (7) ◽  
pp. 1462-1474 ◽  
Author(s):  
A. N. Campbell ◽  
E. M. Kartzmark ◽  
H. M. Hutton
Keyword(s):  
Solid Solution ◽  
Solid Model ◽  
Potassium Sulphate ◽  
Sodium Potassium ◽  
Component System ◽  
Sulphate Chloride ◽  
Close Proximity ◽  
Chloride Water ◽  
Invariant Points ◽  
Solid Phases

The system consisting of the ions Li2++, Na2++, Ka2++, Cl2++, SO4++ and water at 25 °C has been investigated by the chemical analysis of the solutions and of the wet residues. In the solid model eight volumes were found where the following solid phases were in equilibrium with solution: Li2SO4.H2O, K2SO4, Na2SO4.10H2O, K3Na(SO4)2, KLiSO4, solid solution of Na2SO4 and Li2SO4, KCl, and NaCl. Anhydrous Na2SO4 was found to exist only as a surface in the solid diagram. Another volume, LiCl.H2O, was not obtained experimentally owing to its close proximity to the LiCl corner of the diagram.Five invariant points were discovered. No ternary salt was found to exist in the interior of the phase model at the temperature of this study, 25 °C.

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