Zhao Yaqin, Niu Zixuan, Zhong Qianqian, Wang Liping, He Shilong, Xu Mingyang, Wang Jing
Research Center of Mine Ecological Restoration Engineering, School of Environment and Spatial Informatics, China University of Mining and Technology, No.1 Daxue Road, Xuzhou, 221116, Jiangsu, People's Republic of China.
Environmental Health Management Guidance Center, Taicang Urban Administration Bureau, No.118 Tianjin Road, Taicang, Suzhou, 215413, Jiangsu, People's Republic of China.
Bull Environ Contam Toxicol. 2022 Jul;109(1):169-179. doi: 10.1007/s00128-022-03565-9. Epub 2022 Jun 22.
In this study, a new red mud/fly ash composite material (RFCM) for phosphate removal was prepared by granulation and activation methods, using bauxite residue (red mud, RM) as the main raw material, adding with some fly ash and a few adhesives. The effects of different types of RM and adhesives on RFCM for phosphate removal were discussed. It was found that RFCM prepared from sintering red mud and cement waste performed better on phosphate removal than that prepared from Bayer red mud and common industrial adhesives. After calcination activated at appropriate temperature around 800-900℃, the specific surface area of RFCM increased, and new substances with hydroxyl (-OH) appeared on the surface of RFCM, which were the functional groups for phosphate removal. Mechanism of RFCM for phosphate removal was speculated as a combination of physical adsorption, chemical adsorption and chemical precipitation, which mainly depended on ligand exchange and chemical reaction. This research will provide a potential application of bauxite residue in environmental remediation.
在本研究中，以铝土矿残渣（赤泥，RM）为主要原料，添加一些粉煤灰和少量粘结剂，通过造粒和活化方法制备了一种用于除磷的新型赤泥/粉煤灰复合材料（RFCM）。讨论了不同类型的赤泥和粘结剂对RFCM除磷效果的影响。结果发现，由烧结赤泥和水泥废料制备的RFCM在除磷方面比由拜耳法赤泥和普通工业粘结剂制备的RFCM表现更好。在800 - 900℃左右的适当温度下煅烧活化后，RFCM的比表面积增大，且其表面出现了带有羟基（-OH）的新物质，这些是用于除磷的官能团。推测RFCM除磷的机理为物理吸附、化学吸附和化学沉淀的结合，主要依赖于配体交换和化学反应。本研究将为铝土矿残渣在环境修复中的潜在应用提供依据。
