文献类型：期刊文献

英文题名：Green Regeneration of Sodium Bicarbonate from Flue Gas-Desulfurized Ash via an Electrodialysis Metathesis Process

作者：Zhao, Lianchao[1];Wu, Jiaxu[1];Luo, Mengjie[1];Yang, Xiaobo[2];Sun, Yuzhu[1]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake Re, Shanghai 200237, Peoples R China;[2]Qinghai Minzu Univ, Sch Chem & Chem Engn, Xining 810007, Peoples R China

年份：2025

卷号：64

期号：31

起止页码：15428

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20253419016994);WOS:【SCI-EXPANDED(收录号:WOS:001539108700001)】；

基金：The authors would like to thank the financial support from National Key R&D Program (no. 2019YFC0408204).

语种：英文

外文关键词：Carbonates - Carbonization - Desulfurization - Electrodialysis - Energy efficiency - Energy utilization - Flue gases - Sodium

摘要：Desulfurization ash is a byproduct of the flue gas desulfurization (FGD) process. This study developed a novel green regeneration method incorporating electrodialysis metathesis (EDM) and a carbonization process for the production of sodium bicarbonate (NaHCO3) from FGD ash. The results show that under the optimized EDM process conditions of a current density of 30 mAcm-2, a HCO3 -:Na+ molar ratio of 1.05:1, and a temperature of 30 degrees C, the concentration of NaHCO3 solution is 0.78 molL-1, the current efficiency is 94% and the energy consumption is 0.62 kWhkg-1 NaHCO3. A 122 h continuous operation test confirms the stability of the EDM. The solid NaHCO3 prepared through the carbonization process reaches 99.85 wt %. Economic evaluations indicate that the process could generate a gross profit of 1819.6 CNYt-1 of NaHCO3. Overall, our findings demonstrate that the EDM-based regeneration process presents a promising solution for the sustainable utilization of FGD ash and the production of high-purity NaHCO3.