Low-temperature thermodynamic model for the system Na2CO3-MgCO3-CaCO3-H2O

被引:233
作者
Königsberger, E [1 ]
Königsberger, LC [1 ]
Gamsjäger, H [1 ]
机构
[1] Montanuniv Leoben, Inst Phys Chem, A-8700 Leoben, Austria
基金
奥地利科学基金会;
关键词
D O I
10.1016/S0016-7037(99)00238-0
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
A comprehensive low-temperature thermodynamic model for the geochemically important Na2CO3 -MgCO3 -CaCO3-H2O system is presented. The model is based on calorimetrically determined Delta(f)H degrees(298) values, S degrees(298) values and C degrees(p)(T) functions taken from the Literature as well as on mu degrees(298), values of solids derived in this work from solubility measurements obtained in our laboratories or by others. When these thermodynamic quantities were combined with temperature-dependent Pitzer parameters taken from the literature, solubilities calculated for a wide range of conditions agree well with experimental data. The results for several subsystems were summarized by depicting the respective phase diagrams. For the MgO-CO2-H2O subsystem, it was found that the commonly believed stability relations must be revised, i.e., in the temperature range covered, nesquehonite never becomes more stable than hydromagnesite at p(CO2) less than or equal to 1 arm. Although the recommended set of thermodynamic data on sparingly soluble solids was derived from experimental results on mainly NaClO4 systems, it can be incorporated in databanks containing additional Pitzer parameters for modeling more complex fresh- or seawater systems. Copyright (C) 1999 Elsevier Science Ltd.
引用
收藏
页码:3105 / 3119
页数:15
相关论文
共 107 条
[41]   THERMOCHEMICAL STUDY OF MONOHYDROCALCITE [J].
HULL, H ;
TURNBULL, AG .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1973, 37 (03) :685-694
[42]   THE HIGH-TEMPERATURE HEAT-CAPACITY OF NATURAL CALCITE (CACO3) [J].
JACOBS, GK ;
KERRICK, DM ;
KRUPKA, KM .
PHYSICS AND CHEMISTRY OF MINERALS, 1981, 7 (02) :55-59
[43]  
Kazakov A. V., 1959, Int. Geol. Rev, V1, P1, DOI [10.1080/00206815909473450, DOI 10.1080/00206815909473450]
[44]   DETERMINATION OF THE GIBBS FREE-ENERGY OF FORMATION OF MAGNESITE BY SOLUBILITY METHODS [J].
KITTRICK, JA ;
PERYEA, FJ .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1986, 50 (01) :243-247
[45]  
Kline W.D., 1929, Journal of the American Chemical Society, V51, p2093?2097
[46]   SOLID-SOLUTE PHASE-EQUILIBRIA IN AQUEOUS-SOLUTION .6. SOLUBILITIES, COMPLEX-FORMATION, AND ION-INTERACTION PARAMETERS FOR THE SYSTEM NA+ - MG2+ - CLO4(-) - CO2 - H2O AT 25-DEGREES-C [J].
KONIGSBERGER, E ;
SCHMIDT, P ;
GAMSJAGER, H .
JOURNAL OF SOLUTION CHEMISTRY, 1992, 21 (12) :1195-1216
[47]   A NEW OPTIMIZATION ROUTINE FOR CHEMSAGE [J].
KONIGSBERGER, E ;
ERIKSSON, G .
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY, 1995, 19 (02) :207-214
[48]   SOLID-SOLUTE PHASE-EQUILIBRIA IN AQUEOUS-SOLUTION .7. A REINTERPRETATION OF MAGNESIAN CALCITE STABILITIES [J].
KONIGSBERGER, E ;
GAMSJAGER, H .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1992, 56 (11) :4095-4098
[49]  
KONIGSBERGER E, 1987, BER BUNSEN PHYS CHEM, V91, P785
[50]   SOLID-SOLUTE PHASE-EQUILIBRIA IN AQUEOUS-SOLUTION .2. A POTENTIOMETRIC STUDY OF THE ARAGONITE-CALCITE TRANSITION [J].
KONIGSBERGER, E ;
BUGAJSKI, J ;
GAMSJAGER, H .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1989, 53 (11) :2807-2810