Thermodynamic modeling of phases equilibrium in aqueous systems to recover potassium chloride from natural brines

3Citations
Citations of this article
15Readers
Mendeley users who have this article in their library.

Abstract

Chemical fertilizers, such as potassium chloride, ammonium nitrate and other chemical products like sodium hydroxide and soda ash are produced from electrolyte solutions or brines with a high content of soluble salts. Some of these products are manufactured by fractional crystallization, when several salts are separated as solid phases with high purity (>90%). Due to the large global demand for potassium fertilizers, a good knowledge about the compositions of salts and brines is helpful to design an effective process. A thermodynamic model based on Pitzer and Harvie's model was used to predict the composition of crystallized salts after water removal by forced evaporation and cooling from multicomponent solutions or brines. Initially, the salts' solubilities in binary systems (NaCl-H2O, KCl-H2O and MgCl2-H2O) and ternary system (KCl-MgCl2-H2O) were calculated at 20 °C and compared with literature data. Next, the model was compared to our experimental data on the quinary system NaCl-KCl-MgCl2-CaCl2-H2O system at 20 °C. The Pitzer and Harvie's model represented well both the binary and ternary systems. Besides, for the quinary system the fit was good for brine densities up to 1350 kg/m3. The models were used to estimate the chemical composition of the solutions and salts produced by fractional crystallization and in association with material balance to respond to issues related to the production rates in a solar pond containing several salts dissolved, for instance, NaCl, KCl, MgCl2 and CaCl2.

Cite

CITATION STYLE

APA

Silva, R. G. D., Seckler, M., Rocha, S. D. F., Saturnino, D., & Oliveira, É. D. D. (2017). Thermodynamic modeling of phases equilibrium in aqueous systems to recover potassium chloride from natural brines. Journal of Materials Research and Technology, 6(1), 57–64. https://doi.org/10.1016/j.jmrt.2016.05.006

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free