The conventional environmental remediation materials, which are applied for the long-term treatment of mine tailings are easy to fail when affected by acid rain. Therefore, dynamic column simulation experiments were conducted to compare the immobilization persistence of As, Mn, Pb and Zn by the addition of triethylenetetramine modified montmorillonite (TTA-Mt) and calcium-based montmorillonite (Ca-Mt) in sulfide tailings during a simulated 5-year study of acid rain leaching. The structural and morphological characteristics of TTA-Mt were analyzed with FTIR, XRD, SEM, TEM and EDS. Results showed that the additions of TTA-Mt could persistently immobilize the heavy metal ions while Ca-Mt additions had little effect. After long-term simulated leaching for 5 years, TTA-Mt still had superior environmental stability for Zn and As with the immobilization rates of 96% and 86%, and the leaching amounts of Mn and Pb were less than 4.23 and 0.66 mg/kg, respectively. Morphology and chemical fraction analyses confirmed that the immobilization was mainly due to the formation of relatively stable phases by complexation and precipitation. Results presented here demonstrated the significant potential of TTA-Mt for long-term immobilization of heavy metals in tailings against acid rain and thus could provide guidance for remediation of tailings.

用于矿山尾矿长期处理的常规环境修复材料在酸雨影响下容易失效。因此，进行了动态柱模拟实验，比较了在模拟 5年的酸雨淋失研究。采用FTIR、XRD、SEM、TEM和EDS对TTA-Mt的结构和形态特征进行了分析。结果表明，TTA-Mt的添加可以持久地固定重金属离子，而Ca-Mt的添加几乎没有效果。经过5年的长期模拟浸出，TTA-Mt 对 Zn 和 As 仍具有优异的环境稳定性，固定化率为 96% 和 86%，Mn 和 Pb 的浸出量分别小于 4.23 和 0.66 mg/kg。形态和化学组分分析证实，固定主要是由于络合和沉淀形成相对稳定的相。这里展示的结果证明了 TTA-Mt 在长期固定尾矿中的重金属以抵御酸雨方面的巨大潜力，因此可以为尾矿的修复提供指导。