Abstract：
Red mud is an environmental burden during the alumina production process. To mitigate the hazards associated with red mud storage, this study investigated the utilization of alkaline red mud as a treatment agent for acidic mine drainage (AMD) with high concentrations of Fe(II) and Mn(II). This study explored the influence of reaction times, addition amounts of red mud, and pH values on the removal efficiency of Fe (II) and Mn(II) from high-concentration AMD. Various parameters such as suspended solids levels, effluent pH, and zeta potentials were measured to meet discharge standards. The adsorption mechanism of red mud was examined using SEM, XRD, EDX, XPS, and 3D-EEM analysis. Optimal conditions were determined as a reaction time of 2 h, pH value of 5.01 and the addition of 100 g/L red mud, achieving effective removal of Fe(II) (reduced from 1000 to 0.224 mg/L) and Mn (II) (reduced from 20 to 1.03 mg/L). The treated AMD meets discharge standards with reduced suspended matter content of 37.4 mg/L. These findings provided valuable insights for the utilization of red mud waste in engineering applications.
摘要：
赤泥是氧化铝生产过程中的环境负担。为了减轻与赤泥储存相关的危害，这项研究调查了利用碱性赤泥作为高浓度Fe（II）和Mn（II）的酸性矿山排水（AMD）的处理剂。本研究探讨了反应时间的影响，赤泥的添加量，和pH值对高浓度AMD中Fe(II)和Mn(II)的去除效率的影响。各种参数，如悬浮固体水平，出水pH值,和zeta电位的测量，以满足放电标准。利用SEM研究了赤泥的吸附机理,XRD,EDX,XPS,和3D-EEM分析。最佳条件确定为反应时间为2小时，pH值为5.01，添加100g/L赤泥，有效去除Fe(II)(从1000降至0.224mg/L)和Mn(II)(从20降至1.03mg/L)。经处理的AMD符合排放标准，悬浮物含量降低为37.4mg/L。这些发现为赤泥废物在工程应用中的利用提供了有价值的见解。
