Density prediction for the Na-K-Ca-Mg-Cl-H2O system using the Pitzer model

doi:10.13745/j.esf.sf.2021.1.55

Abstract

Abstract: PVTx properties of natural water are widely used in geochemistry and salt lake industry. By establishing the correlation between density, composition, temperature and pressure of potassium-rich brine, one can better understand the enrichment and migration of potassium in complex brine systems. In order to construct a prediction model for brine density based on the Pitzer model, densities of KCl and CaCl₂ aqueous solutions and their mixtures were measured by vibrating-tube densitometry. The concentrations of single solute solutions were near saturation, and ionic strengths of aqueous mixtures were from 1.8 to 11.8 mol·kg^-1. The Pitzer single electrolyte parameters and Pitzer mixing parameters at various temperatures between 283-323 K were obtained by Pitzer ion interaction model fitting using the measured densities, and the Pitzer volumetric parameters were obtained by fitting the volumetric Pitzer model to the experimental data. Densities of the Na-K-Ca-Mg-Cl-H₂O hexary system over the temperature range of 293-313 K were calculated. The calculated density was in good agreement with the experimental results, with the relative error within 0.25%. The results show that ionic interactions had a significant effect on the density of the hexary system. The Pitzer parameters obtained in this paper reflect the interactions between these ions and can be used to make density predictions for complex brines containing K, Ca and Cl ions.

Key words: density, natural water, KCl, CaCl₂, Pitzer ion interaction model

CLC Number:

LU Miao, LI Dongdong, LI Wu, DONG Yaping, HU Bin. Density prediction for the Na-K-Ca-Mg-Cl-H₂O system using the Pitzer model[J]. Earth Science Frontiers, 2021, 28(6): 179-186.

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Density prediction for the Na-K-Ca-Mg-Cl-H₂O system using the Pitzer model

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