Production of Yellow Iron Oxide Pigments by Integration of the Air Oxidation Process with Bipolar Membrane Electrodialysis

详细信息    查看全文

• 作者：Xu Zhang ; Xiaolin Wang ; Yaoming Wang ; Chuanrun Li ; Hongyan Feng ; Tongwen Xu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：January 29, 2014
• 年：2014
• 卷：53
• 期：4
• 页码：1580-1587
• 全文大小：439K
• ISSN：1520-5045

文摘

To resolve problems with the traditional air oxidation process for producing yellow iron oxide pigments, an integration of bipolar membrane electrodialysis (BMED) with the air oxidation process was proposed. Before the integration, both the individual air oxidation process and the BMED process were investigated. The matching conditions for the integration were found to be as follows: pH = 2.5鈥?.8, FeSO₄ concentration = 50鈥?5 g FeSO₄路7H₂O/L, current density = 60 mA/cm², distilled water flow rate = 0.3 L/h, etc., under which all the products generated were qualified as the same as those of the individual production process. In addition, economic evaluation of the integration was conducted. Even though the process cost is not as low as expected, it can achieve 鈥渮ero waste discharge鈥?because the produced inorganic base can be directly used in the air oxidation process and the cogenerated acid can be used in pickling industries. In conclusion, the integration is a feasible, effective, and environmentally friendly process.