Li Bin, Liu Shuai, Zhu Hengxi, Qian Wenmin, Wang Pan, Yang Ruihao, Zhang Jin, Cen Qihong, Liu Zewei, Ning Ping
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China.
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China; Yunnan Appraisal Center for Ecological and Environmental Engineering, Kunming 650500, China.
J Hazard Mater. 2024 Mar 5;465:133075. doi: 10.1016/j.jhazmat.2023.133075. Epub 2023 Nov 25.
The environmental problem caused by industrial emissions of NO has been studied in the past dacades. In this study, red mud coupling with phosphorus sludge were used to enhance the solution to absorb NO from the flue gas. Firstly, red mud reacted with the binder silicic acid in the phosphorus sludge, destroying the emulsion structure of the phosphorus sludge. Then, the P in the phosphorus sludge is completely released, and the P reacted with O in the flue gas to produce O and O. NO and NO contained in the flue gas reacted with the active O and O to produce high-valent NO, such as NO, NO. At last, the mixed slurry of red mud and phosphorus sludge absorbed the high-valent NO, resulting in the formation of Ca(PO)F along with HNO. Using phosphorus sludge to produce O in the reaction process can reduce the production cost of O and achieve waste utilization. Meanwhile, the interaction between red mud and phosphorus sludge can promote phosphorus sludge to produce O and remove F from phosphorus sludge, as well as avoid the problem of secondary pollution. This study should be helpful for red mud and phosphorus sludge utilization and flue gas denitration.
过去几十年里一直在研究工业排放一氧化氮所造成的环境问题。在本研究中，赤泥与磷污泥耦合用于强化从烟气中吸收一氧化氮的解决方案。首先，赤泥与磷污泥中的粘结剂硅酸发生反应，破坏磷污泥的乳液结构。然后，磷污泥中的磷被完全释放出来，磷与烟气中的氧反应生成氧和氧。烟气中所含的一氧化氮和二氧化氮与活性氧和氧反应生成高价态的氮氧化物，如三氧化二氮、五氧化二氮。最后，赤泥与磷污泥的混合浆液吸收高价态的氮氧化物，生成氟磷酸钙以及硝酸。在反应过程中利用磷污泥来生成氧可以降低氧的生产成本并实现废物利用。同时，赤泥与磷污泥之间的相互作用能够促进磷污泥生成氧并从磷污泥中去除氟，还能避免二次污染问题。本研究应有助于赤泥和磷污泥的利用以及烟气脱硝。
