A method for recovering germanium and tin from germanium-tin alloy waste and a dedicated chlorination separation device

Abstract

This invention provides a method and a dedicated chlorination separation device for recovering germanium and tin from germanium-tin alloy waste. The method includes: S1: selectively corroding the waste with a low-concentration alkaline solution, followed by washing and drying with high-purity water; S2: feeding the dried waste into the chlorination separation device, introducing chlorine gas and controlling the temperature gradient to generate gaseous chlorides from germanium and tin, which are then separated in stages through a medium-temperature chamber and a separation tower. Germanium tetrachloride is condensed and collected, tin tetrachloride is refluxed and collected, and the chlorine gas is treated in accordance with regulations; S3: purging residual chlorine with inert gas, cooling, and then discharging the material. The chlorination separation device includes components such as a high-temperature chamber and a medium-temperature chamber, and the separation tower is equipped with multi-layer sieves made of materials suitable for high-temperature corrosion conditions. This invention achieves efficient and high-purity separation and full-component recovery of germanium and tin, solving many pain points of traditional processes, and offering advantages in safety, convenience, economy, and environmental protection, making it suitable for continuous industrial production.

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