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

25℃에서 ZnSO4-Fe2(SO4)3-Na2SO4-H2SO4-NaOH-H2O계에 대해 Pitzer식과 Vasil'ev식에 의한 이온평형해석 비교

  • 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)
  • 이만승 (목포대학교 신소재공학과) ;
  • 이경주 (목포대학교 신소재공학과) ;
  • 남상호 (목포대학교 화학과)
  • Received : 2003.01.08
  • Accepted : 2003.03.31
  • Published : 2003.04.25

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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