Utilization of molybdenum tailings in subgrade materials: Orthogonal experiments, long-term leaching behavior of heavy metals, and environmental impact assessment,Process Safety and Environmental Protection

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Utilization of molybdenum tailings in subgrade materials: Orthogonal experiments, long-term leaching behavior of heavy metals, and environmental impact assessment
Process Safety and Environmental Protection ( IF 6.9 ) Pub Date : 2024-12-07 , DOI: 10.1016/j.psep.2024.12.023
Wentao Ji, Shuo Pan, Jialin Yu, Lili Liu, Quanyin Tan, Jinhui Li

Molybdenum tailings (MoT) are solid waste generated during the production process of metallic molybdenum, posing significant potential hazards to the surrounding environment during storage. This study used MoT to partially replace natural sand to prepare subgrade materials, and investigated the optimal ratio of subgrade materials through orthogonal experiments. The leaching behavior of heavy metals from MoT subgrade materials under acid rain scenarios was investigated, and the leaching mechanisms were explored. Moreover, the impact of heavy metals in MoT subgrade materials on the environment was also assessed. The results show that when the amount of MoT in the subgrade materials was 27 wt%, the unconfined compressive strength (UCS) of the subgrade material can reach up to 4.17 MPa, which meets the relevant Chinese subgrade construction standards. In the leaching toxicity test of MoT subgrade materials, Cu and Ba were extracted, with leaching concentrations of 0.064 mg/L and 1.04 mg/L, respectively, well below the limit of 100 mg/L (GB 5085.3–2007). Long-term leaching experiments have shown that only Cu was leached from MoT subgrade blocks and was controlled by the Elovich equation with a fitting coefficient R2> 0.98. The cumulative leaching amount of Cu in the next 20 years was predicted based on the leaching model under acid rain scenarios, and the leaching concentration was between the limits of Class III to Class IV specified in GB/T 14848–2017, suggesting a low environmental risk. This study provides a theoretical and experimental foundation for the application of MoT in subgrade materials.

更新日期：2024-12-07

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