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phase Equilibria of Salt-water Systems Containing Magnesium and Borate Ions

Acta Geologica Sinica(English Edition) 2014年第S1期88卷 331-332页

作者： HAN Xunian GUO Yafei WANG Shiqiang DENG Tianlong Tianjin Key Laboratory of Marine Resources and Chemistry College of Marine Science and Engineering Tianjin University of Science and Technology

1 Introduction A salt lake is a naturally occurring complex body of water and salt *** than 700 salt lakes are widely distributed in the area of the Qinghai-Tibet *** of the salt lakes are famous for their abundance o... 详细信息

关键词： salt-water system phase equilibrium magnesium borate

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Study on the long period ordered（LPO）phase in the Mg-TM（TM=Cu,Ni,Zn）-Y systems

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材料与冶金学报 2010年第4期9卷 282-284页

作者： JIANG Min ZHANG Jun-feng LI Hong-xiao HAO Shi-ming School of Materials and Metallurgy Northeastern University Shenyang 110004 China

In this work, a systemic study has been performed to the Mg-TM(TM=Cu, Ni, Zn)-Y alloys. It has been proved that a long period ordered (LPO) phase is stable in all these systems with limited solubility ranges of Cu, Ni, Zn and Y. The equilibrium composition of the LPO phase has been determined accurately, and the phase relationships concerning the LPO phase have been established. Based on this, ideal n(TM)/n(Y) ratios for getting the LPO phase have been obtained, which are important for the composition design of the LPO Mg-based alloys.

关键词： long period ordered phase phase equilibrium Mg-TM-RE

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Calculation of phase equilibria between different structural phases by the cluster variation method

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Progress in Natural Science:Materials International 1996年第3期 125-127页

作者：刘兴军蒋敏郝士明袁永文 China Department of Materials Science and Engeneering Northeast University Shenyang 110006

When a and β get equilibrium, the grand potential has a minimum and g~α=g~β. In CVM, the natural iteration method (NIM) can solve the pair probabilities yij~α, yij~β and calculate the grand potentials g~α and g~β; thus the equilibrium compositions can be obtained.2 CVM calculation of phase equilibrium between the solutions with magnetic transition In this paper, a method for calculating the phase equilibria between different structural phases with magnetic transition is proposed on the basis of geometrical analysis of grand potential. Because of the effect of magnetic transition, both the Helmholtz free energy F and the grand potential g change, and the effective chemical potential for the solution with

关键词： cluster variation method (CVM) phase equilibrium magnetic transition.

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Solid-liquid phase equilibria in the quaternary system(Li2B4O7 + Na2B4O7 + Mg2B6O11 + H2O) at 303.15 K

Solid-liquid phase equilibria in the quaternary system(Li2B4...

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中国化学会第七届全国热分析动力学与热动力学学术会议

作者： Xing-feng Dong Shi-qing Wang Yun Song Ya-fei Guo Tian-long Deng College of Chemical Engineering and Materials Science Tianjin Key Laboratory of Marine Resources and Chemistry Tianjin University of Science and Technology

phase equilibria in the quaternary system (LiBO+NaBO+MgBO+HO) at 303.15K were studied experimentally by using the method of isothermal dissolution *** inderite was synthesized by using magnesium sulfate and sodium tetraborate decahydrate reacting in an oil bath at temperature of 40 *** the experiment,the synthesized inderite was determined by X-ray *** correlative phase diagrams were plotted by using the origin based on the experiment *** solid phases were also determined by the method of X-ray *** quaternary phase diagram consists of an invariant point,three stable solution isothermal curves,and three solid crystallization *** solid phase of the system include MgBO·15HO,NaBO·10HO,LiBO·*** is known,there are three different forms of magnesium borate,hungchsaoite,trilateral ascharite,and ***’s reported that when in water,hungchasaoite and trilateral ascharite would be slowly converted to inderite with stirring and *** indicates that different forms magnesium borate will eventually be transformed into ***,inderite is the most stable magnesium borate.

关键词： phase equilibrium phase diagram inderite,Lithium borate Potassium borate

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Solid-liquid phase equilibria for the aqueous ternary system(MgCl2 + Mg2B6O11+H2O) at 298.15 K

Solid-liquid phase equilibria for the aqueous ternary system...

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中国化学会第六届全国热分析动力学与热动力学学术会议

作者： Lianying Lei Long Li Yafei Guo Tianlong Deng Tianjin Key Laboratory of Marine Resources and Chemistry College of Chemical Engineering and Materials Science Tianjin University of Science and Technology College of Chemistry and materials Science Northwest University

Salt lake brine, abundant with minerals as sodium, potassium, lithium, magnesium and borate, is one kind of important natural liquid resource and acts as important raw material in modern industry. The brine resources with high concentrations of magnesium and boron are widely distributed in the western of China,especially in Qinghai-Tibet Plateau

关键词： phase equilibrium Solubility Inderite Bischofite

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Solid-liquid phase Equilibria in the Ternary Systems(KCl + KB5O8 + H2O) and(K2SO4 + KB5O8 + H2O) at 298.15 K and 101.325 kPa

Solid-liquid Phase Equilibria in the Ternary Systems(KCl + K...

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中国化学会第七届全国热分析动力学与热动力学学术会议

作者： Yan Yu Kaiyu Zhao Yafei Guo Xia Wang Tianlong Deng Tianjin Key Laboratory of Marine Resources and Chemistry College of Chemical Engineering and Materials ScienceTianjin University of Science and Technology

The isothermal dissolution equilibrium method and the Schreinemakers’method were used to study the two ternary systems (KCl+KBO+HO) and (KSO+KBO+HO) at 298.15K and 101.325 kPa,and the solubilities,physicochemical property date (ρ,n) for these two systems were determined by *** both ternary systems,they are all in one invariant point,two solubility isotherm curves,and two crystallization zones corresponding to sylvite (KCl,Sy) and potassium pentaborate tetrahydrate (KBO·4HO,PP4) in the former system as well as arcanite(KSO,Ar) and PP4 in the later *** the both ternary systems,the physicochemical properties of refractive indices and densities are increased in the first and then decreased with increment of consistence of potassium chloride in the former system or potassium sulfate in the later system,and attain the maximum in the invariant co-saturation points of each ternary *** ternary systems belong to hydrate typeΙ,and neither double salts nor solid solution was formed.

关键词： phase equilibrium Potassium Borate Solubility Physicochemical property

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Solid-Liquid phase Equilibria of the Quaternary System(Na+, Mg2+//Cl-, borate-H2O) at 298.15 K

Solid-Liquid Phase Equilibria of the Quaternary System(Na+, ...

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中国化学会第六届全国热分析动力学与热动力学学术会议

作者： Shiqiang Wang Xuemin Du Dong Zhao Yafei Guo Tianlong Deng College of Chemical Engineering and Materials Science Tianjin University of Science & Technology College of Marine and Environmental Science Tianjin University of Science & Technology Tianjin Key Laboratory of Marine Resources and Chemistry

There are many salt lakes located in the Qinghai-Tibet Plateau abundant with lithium resources. It is well known that solid–liquid phase equilibrium plays an important role in exploiting salt lake brine resources and describing the geochemical evolution of brine minerals. To exploit the valuable brine resources economically, the phase equilibrium and phase diagram of brine system containing sodium, magnesium, boron is *** solubilities and relevant physico-chemical properties including density, refractive index,viscosity and pH values of the aqueous quaternary system(Na, Mg//Cl, borate-HO)at 298.15 K were determined with the method of isothermal dissolution. According to the experimental results, the dry-salt phase diagram and water diagram were plotted. The quaternary system belongs to the hydrate type I, and neither complex salt nor solid solution is formed. It were composed of two invariant points F and F(F: an equilibrium solution with w(Mg) =0.050%, w(2 Na) = 10.338%, w(2 Cl) =15.799%, w(BO) = 0.635%, and saturated with salts NaCl, NaBO·10HO and MgBO·15HO. F: an equilibrium solution with w(Mg) = 7.790%, w(2 Na) = 0.270%,w(2 Cl) = 22.783%, w(BO) = 0.787%, and saturated with salts MgCl·6HO, NaCl and MgBO·15HO), five univariant solubility curves and four crystallization regions corresponding to NaCl, NaBO·10HO, MgCl·6HO,MgBO·15HO. The solubility of MgBO·15HO is the smallest, so it is the largest solid phase crystallization zone, and easily separated from the solution. In this system, MgBO·15HO is stable and cannot convert. On the EF curve, the contents of J(2 Cl) and w(Mg) increased gradually with the increase of NaCl content, while w(BO) gradually decreased, it shows that the increass of NaCl has the salting-in effect on MgBO·15HO, while the salting-out effect on NaBO·10HO. And the content of J(2 Cl) was maintained in the range of 95.25% and 98.45%with the increase of J(Mg) on F F curve.

关键词： phase equilibrium Isothermal dissolution Magnesium Borate

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Inclusion Control in 55SiCr Spring Steels

Inclusion Control in 55SiCr Spring Steels

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“第十届中国钢铁年会”暨“第六届宝钢学术年会”

作者： Zhao Baojun Huang Zongze Yao Zan Wang Geoff Jiang Zhouhua School of Chemical Engineering The University of Queensland Baoshan Iron and Steel Co. Ltd. School of Materials and Metallurgy Northeastern University

55SiCr is one of the important spring steels widely used in automobile manufacturing. The presence of micro inclusions in the steel can significantly influence a number of spring properties such as fatigue strength. It is important to understand the mechanisms of the inclusion formation so that size and proportion of the inclusions can be controlled. Inclusions in two 55 SiCr spring steels deoxidized by different processes have been analysed by electron probe X-Ray microanalysis. The sizes and compositions of the inclusions in two steels are significantly different. The chemistry of the inclusions observed in 55 SiCr steels can be represented by the SiO-AlO-CaO-MgO system. The liquidus temperatures and viscosities relevant to the refining slags and inclusions have been discussed. It would be possible to use these fundamental properties to characterize and manage the inclusions in the steels produced by different deoxidation processes.

关键词： 55SiCr spring steel inclusion phase equilibrium viscosity

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A high temperature equation of state for the H2O-CaCl2 and H2O-MgCl2 systems

A high temperature equation of state for the H2O-CaCl2 and H...

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中国科学院地质与地球物理研究所2006学术年会

作者： Nancy Moller John H.Weare Department of Chemistry and Biochemistry 0340University of CaliforniaSan DiegoLa JollaCA 92093USA

An equation of state(EOS) is developed for salt-water systems in the high temperature *** an example of the applications,this EOS is parameterized for the calculation of density, immiscibility,and the compositions of coexisting phases in the CaCl-HO and MgCl-HO systems from 523 to 973 K and from saturation pressure to 1500 *** available volumetric and phase equilibrium measurements of these binaries are well represented by this *** EOS is based on a Helmholtz free energy representation constructed from a reference system containing hard-sphere and polar contributions plus an empirical *** the temperature and pressure range in this study,the electrolyte solutes are assumed to be *** water molecules are modeled as hard spheres with point dipoles and the solute molecules,MgCl and CaCl,as hard spheres with point *** free energy of the reference system is calculated from an analytical representation of the Helmholtz free energy of the hard-sphere contributions and perturbative estimates of the electrostatic *** empirical correction used to account for deviations of the reference system predictions from measured data is based on a virial *** formalism allows generalization to aqueous systems containing insoluble gases (CO,CH),alkali chlorides(NaCl,KCl),and alkaline earth chlorides(CaCl,MgCl).The program of this model is available as an electronic annex(see EA1 and EA2) and can also be downloaded at:http://***/***.

关键词： Methane hydrate carbon dioxide hydrate thermodynamic stability electrolyte solution phase equilibrium formation conditions

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phase equilibria in the aqueous ternary system(LiBO2 + NaBO2 + H2O) at(288.15 and 298.15) K

Phase equilibria in the aqueous ternary system(LiBO2 + NaBO2...

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中国化学会第七届全国热分析动力学与热动力学学术会议

作者： Juan Yang Shiqiang Wang Yafei Guo Tianlong Deng Tianjin Key Laboratory of Marine Resources and Chemistry College of Chemical Engineering and Materials ScienceTianjin University of Science and Technology

There are more than 700 salt lakes in Qinghai Tibet Plateau in China,each with an area larger than 1 *** addition,abundant oilfield brine resource,which belongs to the complex seven-component system (Li,Na,K,Ca//Cl,SO,borate–HO) was found in Nanyishan section of the Qaidam Basin[1].To economically exploit the brine and mineral resources,the experimental studies on stable phase equilibrium are essential to effectively separate and purify lithium-containing mixture of salts[2-5].In this paper,the solubilities and physicochemical properties including refractive index,density and p H value in the ternary system (LiBO+NaBO+HO) at (288.15 and 298.15) K was investigated using the isothermal dissolution equilibrium *** to the experimental results of the ternary system at (288.15 and 298.15) K,the stable phase diagrams and the diagrams of physicochemical properties versus composition were *** the phase diagrams of the ternary system at (288.15 and 298.15) K,there are all one invariant point (LiBO·8HO+NaBO·4HO),two univariant isotherm dissolution curves,and two crystallization regions corresponding to (Li BO·8HO) and(NaBO·4HO),*** system at both temperatures belongs to hydrate type I,and neither double salt nor solid solution was found.A comparison of the phase diagrams for the ternary system at (288.15 and 298.15) K in Fig.1 shows that the solid phase numbers and exist minerals are the same,and the crystallized area of NaBO·4HO is increased obviously with the increasing of temperature,while that of Li BO·8HO is *** physicochemical properties (refractive index,density and p H value) of the ternary system at two temperatures changes regularly with the increasing of sodium metaborate concentration.

关键词： phase equilibrium phase diagram Lithium metaborate Sodium metaborate Wet residue

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