Pitzer理论在CaSO_4-Ca(OH)_2-H_2O系硫酸根平衡浓度计算中的应用  

Application of Pitzer theory to calculation of sulfate equilibrium concentration in CaSO_4-Ca(OH)_2-H_2O system

作　　者：彭小玉[1,2] 王云燕[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,湖南长沙410083 [2]湖南省环境监测中心站,湖南长沙410014

出　　处：《中南大学学报（自然科学版）》2010年第3期859-864,共6页Journal of Central South University:Science and Technology

基　　金：国家杰出青年科学基金资助项目(50925417);国家自然科学基金重点项目(50830301);国家科技支撑计划重点资助项目(2007BAC25B01);教育部科技重大项目(308019);湖南省自然科学基金资助项目(08JJ3020)

摘　　要：利用Pitzer理论,通过C++语言编程,计算了不同pH条件下CaSO4-Ca(OH)2-H2O体系中硫酸根的平衡浓度,考察Na+对该体系硫酸根平衡浓度的影响。计算结果表明:当pH为3.0～10.0时,SO42-的平衡浓度最小,基本维持一恒定值0.0152mol/L,当pH高于12.0时,SO42-的平衡浓度显著增大,且体系中Na+存在时溶液中SO42-的平衡浓度增大,但SO42-平衡浓度的变化规律与无Na+时的变化规律基本一致。In order to provide some theoretical basis for the treatment and reutilization of sulfate contaminated industrial wastewater,Pitzer theory was adopted to calculate the equilibrium concentration of sulfate in CaSO4-Ca（OH）2-H2O system at different pH through C＋＋ language programming,and the effect of Na＋ on the equilibrium concentration of sulfate in this system was investigated. The results show that the equilibrium concentration of sulfate is minimal and invariant with the concentration of 0.015 2 mol/L when pH is 3.0-10.0 and increases significantly when pH is higher than 12.0. The equilibrium concentration of sulfate increases with the addition of Na＋ in the solution as the variation law of sulfate equilibrium concentration of the system is in agreement with that of without Na＋ system.

关 键 词：PITZER理论 溶解度 SO42-平衡浓度 活度系数 

分 类 号：O642.4[理学—物理化学]