Extraction of molybdenum (Mo) and tungsten (W) from waste alloy significantly impacts the alleviation of resource shortage and ecological environment. In this study, Mn additive was utilized as a recyclable roasting aid to convert Mo and W for facilitating extraction, by considering thermodynamic calculations. The effect of β-MnO₂ as a roasting additive on the phase evolution of Mo, W, and Mn elements and the optimal process conditions were evaluated by XRD, SEM-EDS, thermal analysis, and alkali leaching experiments. Notably, Mo and W in the alloy waste got oxidized and converted into soluble MnMoO₄ and MnWO₄, respectively, under the conditions of roasting temperature of 750 °C, β-MnO₂ amount of 75% of waste alloy mass, and time of 1 h. During alkaline leaching, 100.00% Mo and 99.59% W in the roasted product were extracted, which was accompanied with the precipitation of leached residue of α-MnO₂, Mn₃O₄, and Mn₂O₃ from Mn present in the leach liquor (NaOH concentration 2 mol⋅L⁻¹, solid–liquid ratio 10% (w/v), time 5 h, temperature 90 °C). When the recycled leached residue was employed in the next roasting process, the leaching efficiency of Mo and W was maintained above 98.56%. Moreover, the reaction mechanisms of roasting and leaching were investigated by kinetics study. Roasting with β-MnO₂ fundamentally reduced the production cost with the high extraction efficiency of Mo and W, and the flue gas recovery process was no longer required, which is beneficial to industrial application.

从废合金中提取钼（Mo）和钨（W）对缓解资源短缺和生态环境有重要影响。在这项研究中，通过考虑热力学计算，Mn 添加剂被用作可回收的焙烧助剂来转化 Mo 和 W 以促进提取。通过XRD、SEM-EDS、热分析和碱浸实验评价了β-MnO _{2作为焙烧添加剂对Mo、W和Mn元素相演化的影响以及最佳工艺条件。}值得注意的是，合金废料中的Mo和W在_{750 ℃焙烧}温度、β- MnO ₂量为废合金质量的 75%，时间为 1 h。在碱浸过程中，焙烧产物中Mo和99.59%的W被提取出来，伴随着浸出液中Mn的浸出残渣α-MnO ₂、Mn ₃ O ₄和Mn ₂ O ₃的沉淀。 （NaOH 浓度 2 mol·L ^-1，固液比 10% (w/v)，时间 5 h，温度 90 °C）。当回收的浸出残渣用于下一步焙烧过程时，Mo和W的浸出率保持在98.56%以上。此外，通过动力学研究研究了焙烧和浸出的反应机理。用β-MnO _2焙烧钼、钨提取效率高，从根本上降低了生产成本，不再需要烟气回收工艺，有利于工业化应用。