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›› 2009, Vol. 9 ›› Issue (1): 84-87.

• 系统与集成 • 上一篇    下一篇

CaSO4-Ca(OH)2-H2O体系中硫酸根的平衡浓度

王云燕 彭小玉 柴立元 舒余德   

  1. 中南大学冶金科学与工程学院 中南大学冶金科学与工程学院 中南大学冶金科学与工程学院 中南大学冶金科学与工程学院
  • 收稿日期:2008-10-14 修回日期:2008-11-18 出版日期:2009-02-20 发布日期:2009-02-20
  • 通讯作者: 王云燕

Equilibrium Concentration of Sulfate Ion in CaSO4-Ca(OH)2-H2O System

WANG Yun-yan PENG Xiao-yu CHAI Li-yuan SHU Yu-de   

  1. College of Metallurgical Science and Engineering, Central South University College of Metallurgical Science and Engineering, Central South University College of Metallurgical Science and Engineering, Central South University College of Metallurgical Science and Engineering, Central South University
  • Received:2008-10-14 Revised:2008-11-18 Online:2009-02-20 Published:2009-02-20
  • Contact: WANG Yun-yan

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摘要： 测定了25℃时不同pH值下CaSO4-Ca(OH)2-H2O三元体系中SO42-的平衡浓度，考察了Na+离子的影响. 结果表明，pH值在3.0~12.0范围内SO42-平衡浓度最小，为0.01235 mol/L，基本不受pH值的影响；Na+的存在使溶液中SO42-的平衡浓度增大，且二者呈线性关系. 应用Pitzer电解质溶液理论对体系进行了活度修正，计算结果与实验测定结果基本一致. 研究结果为含SO42-工业废水处理提供了一定的理论依据.

关键词: CaSO4-Ca(OH)2-H2O体系, SO42-平衡浓度, Na+浓度, Pitzer理论, 活度系数

Abstract: The equilibrium concentration of sulfate ion, SO42-, in CaSO4-Ca(OH)2-H2O system under different pH values at 25℃ was determined, and the effect of concentration of Na+ on it was also investigated. The results showed that there was little influence of pH value on the SO42- equilibrium concentration, the value of 0.01235 mol/L was minimal when pH value was 3.0~12.0. The SO42- concentration increased with the addition of concentration of Na+ in the solution. In addition, Pitzer theory was adopted to adjust the activity coefficient of the system, and the theoretical calculation was in agreement with experimental data. These research results may provide some theoretical basis for the treatment of sulfate contaminated industrial wastewater

Key words: CaSO4-Ca(OH)2-H2O system, sulfate ion equilibrium concentration, Na+ concentration, Pitzer theory, activity coefficient

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