CaSO_4-Ca(OH)_2-H_2O体系中硫酸根的平衡浓度  

Equilibrium Concentration of Sulfate Ion in CaSO_4-Ca(OH)_2-H_2O System

作　　者：王云燕[1] 彭小玉[1] 柴立元[1] 舒余德[1] 

机构地区：[1]中南大学冶金科学与工程学院环境工程研究所,湖南长沙410083

出　　处：《过程工程学报》2009年第1期84-87,共4页The Chinese Journal of Process Engineering

基　　金：国家科技支撑计划重点基金资助项目(编号:2007BAC25B01);教育部科技重大基金资助项目(编号:308019);湖南省自然科学基金资助项目(编号:08JJ3020);湖南省科技计划基金资助项目(编号:2008SK4031);湖南省节能减排科技重大专项基金资助项目(编号:08SK1005;08SK1002)

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0.01235mol/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.The equilibrium concentration of sulfate ion, SO4^2-, 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 SO4^2- equilibrium concentration, the value of 0.01235 mol/L was minimal when pH value was 3.0～12.0. The SO4^2- 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

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 

分 类 号：X131.2[环境科学与工程—环境科学]