The solubility of fluorite in Na-K-Cl solutions at temperatures up to 260 degrees C and ionic strengths up to 4 mol/kg H2O

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F17%3APU136021" target="_blank" >RIV/00216305:26620/17:PU136021 - isvavai.cz</a>

Alternative codes found

RIV/62156489:43410/17:43913032

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0883292716305236" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0883292716305236</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.apgeochem.2017.04.017" target="_blank" >10.1016/j.apgeochem.2017.04.017</a>

Result language

angličtina

Original language name

The solubility of fluorite in Na-K-Cl solutions at temperatures up to 260 degrees C and ionic strengths up to 4 mol/kg H2O

Original language description

The solubility of fluorite in hydrothermal conditions is important in ore forming and geothermal processes and groundwater utilization. However, a quantitative description of the geochemical behavior of fluorite under hydrothermal conditions has not been previously reported. In this work, the solubility of fluorite in Na-K-Cl solutions at temperatures up to 260 degrees C and ionic strengths up to 4 M was determined by experiments and modeling. The solubility products obtained in this work at 30 and 50 degrees C under ambient pressure and those from literature were used to regress the density model parameters for fluorite solubility product calculation at high temperature. The Pitzer interaction model was adopted to calculate the activity coefficient. The fluorite solubility determined in KCl solution at 250 degrees C under vapor saturated pressure and that from the literature were combined with the low-temperature thermodynamic properties of heat capacity and osmotic coefficient to obtain the binary parameters of NaF and KF at temperatures up to 260 degrees C. A thermodynamic model was then developed for calculating the fluorite solubility in Na-K-Cl solution at temperatures up to 260 degrees C, under vapor saturated pressure and ionic strengths up to 4 M. As calculated from this model, fluorite solubility measured at 200 degrees C and 0.1 M NaCl was well predicted. Both temperature and ionic strength had significant effects on fluorite solubility, and fluorite exhibited a similar dissolution pattern in both NaCl and KCl solution. When the concentration was lower than 2 M, the solubility of fluorite first increased with temperature, reached a maximum at approximately 100 degrees C, and then decreased. When the concentration was higher than 2 M, the solubility of fluorite increased monotonically with temperature. (C) 2017 Elsevier Ltd. All rights reserved.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10511 - Environmental sciences (social aspects to be 5.7)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

APPLIED GEOCHEMISTRY

ISSN

0883-2927

e-ISSN

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Volume of the periodical

82

Issue of the periodical within the volume

1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

10

Pages from-to

79-88

UT code for WoS article

000403734000007

EID of the result in the Scopus database

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