Preparation of MgSO4·H2O by the Phase Diagram Method

2013 ◽  
Vol 807-809 ◽  
pp. 2788-2792
Author(s):  
Hong Xia Li ◽  
De Wen Zeng ◽  
Yan Yao
Keyword(s):  
Phase Diagram ◽  
Binary System ◽  
Ternary System ◽  
Magnesium Sulfate ◽  
Phase Diagrams ◽  
Industrial Production ◽  
Diagram Method ◽  
Equilibrium Time ◽  
Salt Pans ◽  
C 50

Kieserite (MgSO4·H2O) which has great application in recent years, was prepared according to the binary system MgSO4H2O at 80°C and the ternary system MgCl2MgSO4H2O at 25°C, 50°C and 75°C phase diagrams in this research. We reveal that the pure MgSO4·H2O is acquired in the ternary system MgCl2MgSO4H2O at 75°C with MgCl2 (23.966%~37.93%) for the equilibrium time 5~7days. The higher hydrated magnesium sulfate can be obtained in the ternary system with MgCl2 (0~34.52%) at 25°C, (0~35.684%) at 50°C, and (0~23.966%) at 75°C for 5~7days. These results are beneficial for the industrial production by converting MgSO4·7H2O and MgCl2·6H2O which are not fully exploited in salt pans into the useful MgSO4·H2O.

Phase Diagram of the System LaCl3-CaCl2-NaCl

1987 ◽  
Vol 42 (12) ◽  
pp. 1421-1424 ◽  
Author(s):  
K. Igarashi ◽  
H. Ohtani ◽  
J. Mochinaga
Keyword(s):  
Phase Diagram ◽  
Ternary System ◽  
Phase Diagrams ◽  
Binary Systems ◽  
Eutectic Point ◽  
Peritectic Point

The phase diagram of ternary system LaCl3-CaCl2-NaCl has been constructed from the phase diagrams of the three binary systems and of thirteen quasi-binary systems determined by DTA. For the binaries LaCl3-CaCl2 and CaCl2-NaCl eutectic points were observed at 651 °C , 35.1 mol% LaCl3 and at 508 °C , 49.9 mol% NaCl, respectively. For LaCl3-NaCl, a peritectic point besides the eutectic point at 545 °C , 36.1 mol% LaCl3 was found at 690 °C , 57.5 mol%, which is attributable to the formation of the peritectic compound 3 LaCl3 · NaCl. The phase diagram of the ternary system has a ternary eutetic point and a ternary peritectic point due to 3 LaCl3-NaCl, the form er at 462 °C and 12.1 - 3 9 .7 - 4 8 .2 mol% (LaCl3-CaCl2-NaCl) and the latter at 612 °C and 26.9 - 55.1 - 18.0 mol%.

Phase Diagram and Precipitation Behaviour in Ni-Rich Region of Ni-Ta-Al Ternary System

2007 ◽  
Vol 561-565 ◽  
pp. 2329-2332
Author(s):  
Yuhki Tsukada ◽  
Koichi Hasuike ◽  
Yoshinori Murata ◽  
Masahiko Morinaga
Keyword(s):  
Phase Diagram ◽  
Binary System ◽  
Ternary System ◽  
Phase Region ◽  
Al Alloy ◽  
High Melting ◽  
Rich Region ◽  
High Melting Temperature ◽  
Precipitation Behaviour ◽  
Phase Relationships

Tantalum (Ta) addition is one of the promising method for increasing the strength of Ni-based wrought alloys such as Inconel 718, because Ta is an element having a high melting temperature. For wrought alloys, it is necessary to make clear the phase relationships at 700~1000°C, but there is a few report on phase diagrams of Ni-Ta and Ni-Ta-Al systems at those temperatures. In this study, the phase diagram in Ni-rich region of Ni-Ta-Al system at 800°C, which is the important temperature for the practical use of the wrought alloys, was investigated. The equilibrium relations of each phase were examined by a conventional XRD, SEM/EDX and TEM observations. It was found that the γ-phase region expanded considerably towards Ta-rich compositional region in Ni-Ta-Al system at 800°C. Also, it was observed that the γ phase precipitated secondarily in the primary precipitated γ’ phase in Ni-10.5mol%Ta-5.5mol%Al alloy. Ni8Ta phase was not detected even in Ni-Ta binary system in this study, although this phase was reported previously.

The Na+, K+/CN-, I- binary systems

1990 ◽  
Vol 55 (7) ◽  
pp. 1741-1749
Author(s):  
Milan Drátovský ◽  
Bohumír Grüner ◽  
Ivan Horsák ◽  
Jiří Makovička
Keyword(s):  
Phase Diagram ◽  
Binary System ◽  
Phase Diagrams ◽  
Solid Solutions ◽  
Binary Systems ◽  
Smoothing Spline ◽  
Spline Functions ◽  
Solidus Curve

The phase diagram of the KCN-KI binary system was measured and the published phase diagrams of the KCN-NaCN, NaI-KI and NaCN-NaI systems were verified and completed. The systems form solid solutions with minima on the liquidus and solidus curves. The solid solutions in the KCN-KI system probably have a high segregation temperature, close to the solidus curve. For the four binary systems the experimental points were fitted with liquidus and solidus curves either by applying smoothing spline functions or by using two different models. The results obtained are discussed.

scholarly journals 3D computer model of the Ag-Cu-Ni T-x-y diagram: verification of sections in the atlas of phase diagrams for lead-free soldering

2021 ◽  
Vol 57 (1) ◽  
pp. 15-24
Author(s):  
M. D. Parfenova ◽  
V. P. Vorob'eva ◽  
V. I. Lutsyk
Keyword(s):  
Phase Diagram ◽  
Ternary System ◽  
Phase Diagrams ◽  
Computer Model ◽  
Binary Systems ◽  
Three Dimensional ◽  
Lead Free ◽  
Published Data ◽  
Isothermal Sections ◽  
3D Computer Model

Spatial (three-dimensional - 3D) computer model of the T-x-y diagram of the Ag - Cu - Ni system, which is promising for the development of environmentally friendly solders, is presented. The model is constructed on the basis of published data on the binary systems forming this ternary system, the concentration projection of the liquidus surfaces, and four isothermal sections. It is shown that the phase diagram (PD) consists of 14 surfaces and 9 phase regions. The adequacy of the model is confirmed by comparing the isothermal sections and the liquidus projection.

Chemischer Transport intermetallischer Phasen IV: Das System Fe - Ge/Chemical Vapour Transport of Intermetallic Phases IV: The System Fe - Ge

2001 ◽  
Vol 56 (4-5) ◽  
pp. 329-336 ◽  
Author(s):  
O. Bosholm ◽  
H. Oppermann ◽  
S. Däbritz
Keyword(s):  
Phase Diagram ◽  
Binary System ◽  
Phase Diagrams ◽  
Chemical Vapour ◽  
Chemical Transport ◽  
Intermetallic Phases ◽  
Vapour Transport ◽  
Two Phase ◽  
Transport Agent ◽  
Chemical Vapour Transport

Abstract Six phases exist in the binary system iron-germanium Fe3Ge, β, η, Fe6Ge5, FeGe and FeGe2. All phases could be prepared by chemical transport with iodine as transport agent in the temperature range between T1 (600 °C) and T2 (950 °C). Two phase diagrams have been known in the literature from specific experiments of chemical vapour transport. It is now possible to decide which phase diagram is the most valid description.

scholarly journals Phase Diagram of Binary Alloy Nanoparticles under High Pressure

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2929
Author(s):  
Han Gyeol Kim ◽  
Joonho Lee ◽  
Guy Makov
Keyword(s):  
Phase Diagram ◽  
Phase Diagrams ◽  
Interaction Parameter ◽  
Excess Volume ◽  
Eutectic Temperature ◽  
Calphad Method ◽  
Alloy Nanoparticles ◽  
Thermodynamic Conditions ◽  
Nanoparticle System ◽  
Pressure Phase

CALPHAD (CALculation of PHAse Diagram) is a useful tool to construct phase diagrams of various materials under different thermodynamic conditions. Researchers have extended the use of the CALPHAD method to nanophase diagrams and pressure phase diagrams. In this study, the phase diagram of an arbitrary A–B nanoparticle system under pressure was investigated. The effects of the interaction parameter and excess volume were investigated with increasing pressure. The eutectic temperature was found to decrease in most cases, except when the interaction parameter in the liquid was zero and that in the solid was positive, while the excess volume parameter of the liquid was positive. Under these conditions, the eutectic temperature increased with increasing pressure.

Phase diagram and thermodynamic properties of the LaI3–RbI binary system

Calphad ◽  
2020 ◽  
Vol 70 ◽  
pp. 101809
Author(s):  
Leszek Rycerz ◽  
Jan Kapała ◽  
Beata Salamon ◽  
Irena Szczygieł ◽  
Marcelle Gaune-Escard
Keyword(s):  
Phase Diagram ◽  
Binary System ◽  
Thermodynamic Properties

Calculation of phase diagrams and thermodynamic properties of 14 additive and reciprocal ternary systems containing Li2CO3, Na2CO3, K2CO3, Li2SO4, Na2SO4, K2SO4, LiOH, NaOH, and KOH

1984 ◽  
Vol 62 (3) ◽  
pp. 457-474 ◽  
Author(s):  
A. D. Pelton ◽  
C. W. Bale ◽  
P. L. Lin
Keyword(s):  
Phase Diagram ◽  
Thermodynamic Properties ◽  
Molten Salt ◽  
Phase Diagrams ◽  
Binary Systems ◽  
Ternary Phase ◽  
Ternary Phase Diagram ◽  
Ternary Systems ◽  
Maximum Error ◽  
Critical Assessment

Phase diagrams and thermodynamic properties of five additive molten salt ternary systems and nine reciprocal molten salt ternary systems containing the ions Li+, Na+, [Formula: see text], OH− are calculated from the thermodynamic properties of their binary subsystems which were obtained previously by a critical assessment of the thermodynamic data and the phase diagrams in these binary systems. Thermodynamic properties of ternary liquid phases are estimated from the binary properties by means of the Conformal Ionic Solution Theory. The ternary phase diagrams are then calculated from these thermodynamic properties by means of computer programs designed for the purpose. It is found that a ternary phase diagram can generally be calculated in this way with a maximum error about twice that of the maximum error in the binary phase diagrams upon which the calculations are based. If, in addition, some reliable ternary phase diagram measurements are available, these can be used to obtain small ternary correction terms. In this way, ternary phase diagram measurements can be smoothed and the isotherms drawn in a thermodynamically correct way. The thermodynamic approach permits experimental data to be critically assessed in the light of thermodynamic principles and accepted solution models. A critical assessment of error limits on all the calculated ternary diagrams is made, and suggestions as to which composition regions merit further experimental study are given.

Binary system SmCo: revision of the phase diagram in the Co rich field

1996 ◽  
Vol 241 (1-2) ◽  
pp. 216-223 ◽  
Author(s):  
L. Cataldo ◽  
A. Lefèvre ◽  
F. Ducret ◽  
M.-Th. Cohen-Adad ◽  
C. Allibert ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Binary System
Sign in / Sign up

Export Citation Format

Share Document