Abstract Rhenium-bearing molybdenite concentrate is a typical mineral resource to recover molybdenum and rhenium, but has long been poorly utilized via oxidative roasting-leaching route. In this work, a novel flowsheet consisting of chloride leaching, co-volatilization, selective condensation, and water leaching has been proposed and verified on the basis of both experimental and thermodynamic studies. Purification treatment was first performed using a solution of HCl and CaCl2, which increased the grades of Mo and Re from 43.6 wt% and 321 mg/kg to 51.3 wt% and 374 mg/kg, respectively, after leaching at 95 °C for 30 min. The purified concentrate was then roasted with air supply after being pelletized with the addition of SiO2 and Al2O3, which served as skeleton materials to prevent pellets from being broken. The results showed that over 99.9% of rhenium and 90.4% of Mo could be co-volatilized within 30 min when temperature was 1050 °C. The volatile material condensed above 500 °C was assayed to be highly pure MoO3 (99.9%) with almost no rhenium, while the volatile material collected at lower temperature was concentrated with high-content Re2O7. Furthermore, through water leaching at 25 °C for 30 min with liquid to solid ratio of 5 mL/g, 98.6% of Re was easily leached out from volatiles.

中文翻译：

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高效利用含铼辉钼精矿的共挥发水浸出工艺

摘要 含铼辉钼精矿是一种典型的回收钼和铼的矿产资源，但长期以来采用氧化焙烧浸出法的利用效果不佳。在这项工作中，在实验和热力学研究的基础上，提出并验证了一种由氯化物浸出、共挥发、选择性冷凝和水浸出组成的新流程。首先使用 HCl 和 CaCl2 溶液进行纯化处理，在 95 °C 浸出 30 年后，Mo 和 Re 的品位分别从 43.6 wt% 和 321 mg/kg 提高到 51.3 wt% 和 374 mg/kg。分钟 提纯后的精矿在造粒后加气焙烧，加入SiO2和Al2O3作为骨架材料，防止球团破碎。结果显示，超过 99. 当温度为1050℃时，9%的铼和90.4%的Mo可以在30分钟内共挥发。在 500 °C 以上冷凝的挥发性物质被分析为高纯度 MoO3 (99.9%)，几乎不含铼，而在较低温度下收集的挥发性物质则用高含量的 Re2O7 浓缩。此外，通过在 25°C 下浸出 30 分钟，液固比为 5 mL/g，98.6% 的 Re 很容易从挥发物中浸出。