研究了双极膜电渗析法连续制备聚合硫酸铁(PFS)的工艺.主要考察了电流密度、原料补充液中硫酸亚铁和硫酸的摩尔比以及原料补充液流速对产品PFS各性能指标(盐基度、全铁含量、pH、密度等)和过程能耗的影响.研究结果表明:电流密度从10mA/cm2增加到20mA/cm2时,盐基度从8.59％显著增加到11.32％,去浊率从84.31％逐渐增加到95.34％,但当电流密度大于20mA/cm2时,盐基度和去浊率稍有下降,过程能耗最高可达4.26kW·h/kg H2SO4,酸液罐酸浓度最高可达0.45mol/L;原料补充液中硫酸亚铁和硫酸的摩尔比从2.01增加到4.08时,盐基度从8.69％增加到11.38％,去浊率从94.96％逐渐增加到95.88％,能耗在3.05～3.15kW·h/kg H2SO4范围内变化,酸液罐酸浓度约为0.38mol/L;原料补充液流速从1mL/min增加到3mL/min时,盐基度从11.52％下降到6.75％,去浊率从95.92％逐渐降低到75.61％,同时,能耗从3.09kW·h/kg H2SO4下降到2.77kW·h/kg H2SO4.%Bipolar membrane electrodialysis (BMED) was used to prepare polyferric sulfate (PFS) continuously. Effect of current density and molar ratio of FeSO4 to H2 SO4 in feed and feed flow rate on the properties (basicity, total iron content, pH, density, etc.) of PFS and process energy consumption was investigated. Results show that when current density increased from 10 mA/cm2 to 20 mA/cm2, basicity and turbidity removal ratio increased from 8.59％ to 11.32％ and from 84.31％ to 95.34％, respectively.However, when current density was greater than 20 mA/cm2, turbidity removal ratio and basicity decreased slightly, while process energy consumption increased up to 4.26 kW·h/kg H2 SO4 and the acid concentration in acid compartment rose to 0.45 mol/L. In addition, as the molar ratio of FeSO4 to H2 SO4 in feed increased from 2.01 to 4.08, basicity increased from 8.69％ to 11.38％, turbidity removal ratio increased gradually from 94.96％ to 95.88％, while the process energy consumption changed in a small range of 3.05-3.15 kW·h/kg H2 SO4 and the acid concentration in acid compartment was about 0.38 mol/L. Finally, as feed flow rate increased from 1 to 3 mL/min, basicity reduced from 11.52％ to 6.75％, turbidity removal ratio decreased gradually from 95.92％ to 75.61％ and the process energy consumption decreased from 3.09 to2.77 kW·h/kg H2 SO4.
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