双极膜电渗析法连续制备聚合硫酸铁

doi:10.16085/j.issn.1000-6613.2018-1238

摘要/Abstract

摘要：

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。

关键词: 电渗析, 聚合硫酸铁, 絮凝, 盐基度, 双极膜

Abstract:

Bipolar membrane electrodialysis (BMED) was used to prepare polyferric sulfate (PFS) continuously. Effect of current density and molar ratio of FeSO₄ to H₂SO₄ 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 10mA/cm² to 20mA/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 20mA/cm², turbidity removal ratio and basicity decreased slightly, while process energy consumption increased up to 4.26kW·h/kg H₂SO₄ and the acid concentration in acid compartment rose to 0.45mol/L. In addition, as the molar ratio of FeSO₄ to H₂SO₄ 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 H₂SO₄ and the acid concentration in acid compartment was about 0.38mol/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 to 2.77kW·h/kg H₂SO₄.

Key words: electrodialysis, polyferric sulfate, coagulation, basicity, bipolar membrane

中图分类号:

TQ 028.8

吕燕,韩建华,田智灏,张旭. 双极膜电渗析法连续制备聚合硫酸铁[J]. 化工进展, 2019, 38(03): 1524-1529.

Yan LÜ,Jianhua HAN,Zhihao TIAN,Xu ZHANG. Bipolar membrane electrodialysis process for preparing polyferric sulfate continuously[J]. Chemical Industry and Engineering Progress, 2019, 38(03): 1524-1529.

图/表 12

参考文献 15

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电流密度 /mA·cm^-2	平均密度 /g·mL^-1	平均pH （10g·L^-1, Sol.）^①	平均还原性物质质量分数(Fe²⁺) /%	平均全铁质量分数/%
10	1.43	2.45	0.0067	10.41
15	1.43	2.54	0.0067	10.52
20	1.42	2.56	0.0068	10.57
30	1.44	2.58	0.0066	10.50

电流密度 /mA·cm^-2	平均密度 /g·mL^-1	平均pH （10g·L^-1, Sol.）^①	平均还原性物质质量分数(Fe²⁺) /%	平均全铁质量分数/%
10	1.43	2.45	0.0067	10.41
15	1.43	2.54	0.0067	10.52
20	1.42	2.56	0.0068	10.57
30	1.44	2.58	0.0066	10.50

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