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中文摘要：
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。
英文摘要：
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.
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