Ultrasonic radiation is widely used in the enhancement of leaching process with outstanding advantages in leaching efficiency. In this study, a germanium concentrate was leached with NaClO and the influence of factors such as ultrasound power and oxidant addition on the leaching efficiency of germanium from the concentrate were investigated. The leaching efficiency of germanium reached 96.8% at the initial concentration of hydrochloric acid of 8 mol/L, the oxidant dosage of 1.5 g/L NaClO, the liquid-solid volume/mass ratio of 6 mL/g, the ultrasonic power density of 13.3 W/cm3, and the stirring speed of 300 rpm for 30 min at 60 °C. The leaching efficiency was 4.50% higher at a shorter leaching time and lower temperature, than that of the conventional process, which was mainly attributed to the ultrasonic multiple effects and NaClO. Meanwhile, NaClO can effectively oxidize As(III) into non-volatile As(V), remove arsenic in germanium, facilitate the subsequent distillation, improve the leaching efficiency, and be more environmentally friendly.

中文翻译：

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HCl/NaOCl 超声辅助强化浸出锗精矿的研究


超声波辐射广泛用于浸出过程的增强，在浸出效率方面具有突出的优势。本研究采用 NaClO 浸出锗精矿，研究了超声功率和氧化剂添加等因素对精矿锗浸出效率的影响。在盐酸初始浓度 8 mol/L、氧化剂用量 1.5 g/L NaClO、液固体积/质量比 6 mL/g、超声功率密度 13.3 W/cm3、搅拌转速 30 rpm、60 °C 下 30 min 时，锗的浸出效率达到 96.8%。 在较短的浸出时间和较低的温度下，浸出效率比常规工艺高 4.50%，这主要归因于超声多重效应和 NaClO。同时，NaClO 可以有效地将 As（III） 氧化成不挥发的 As（V），去除锗中的砷，便于后续蒸馏，提高浸出效率，更加环保。