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Comparison of Ionic Equilibria Analysis of ZnSO4-Fe2(SO4)3-Na2SO4-H2SO4-NaOH-H2O System at 25℃ between Pitzer and Vasil'ev Equation  

Lee, Man-Seung (Department of Advanced Materials Science & Eng., Mokpo National University)
Lee, Kyoung-Ju (Department of Advanced Materials Science & Eng., Mokpo National University)
Nam, Sang-Ho (Department of Chemistry, Mokpo National University)
Publication Information
Analytical Science and Technology / v.16, no.2, 2003 , pp. 159-165 More about this Journal
Abstract
To develop an ionic equilibria model applicable to the sulfuric acid leaching solutions of zinc oxide ore, the method of the Pitzer equation and that of the Vasil'ev equation were compared. As the ionic strength of the solution increased to 9 m, the results of ionic equilibria by the Pitzer equation were more accurate than those by Vasil'ev. To simulate the sulfuric acid leaching solutions of zinc oxide ore, the mixed solutions with the various composition of $ZnSO_4-Fe_2(SO_4)_3-Na_2SO_4-H_2SO_4-NaOH-H_2O$ were prepared. The pH values calculated in this study agreed well with those measured at $25^{\circ}C$.
Keywords
zinc oxide; $H_2SO_4$; leaching; Pitzer; Vasil'ev; pH;
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