A method for recovering germanium from germanium-containing fly ash by Joule thermal sulfidation

By converting germanium in fly ash into GeS2/GeS through Joule thermal sulfidation, the problems of high energy consumption and low recovery rate in traditional methods are solved, and efficient and low-energy germanium recovery is achieved.

CN122303637APending Publication Date: 2026-06-30CHINA UNIV OF MINING & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA UNIV OF MINING & TECH
Filing Date
2026-04-29
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing technologies for recovering germanium from fly ash suffer from high acid consumption, high energy consumption, and low recovery rates, making it difficult to meet the economic and efficiency requirements for industrial applications.

Method used

The Joule thermal sulfidation method is used to mix germanium-containing fly ash with a sulfiding agent and then subject it to flash thermal shock treatment in a vacuum environment to generate GeS2/GeS, thereby achieving efficient separation and recovery of germanium and taking advantage of the high volatility of germanium sulfides at high temperatures.

Benefits of technology

This method achieves efficient germanium recovery, reduces process energy consumption, simplifies the process, improves the recovery rate, and solves the problems of high energy consumption and low efficiency in traditional methods.

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Abstract

This invention discloses a method for recovering germanium from germanium-containing fly ash via Joule thermal sulfidation, belonging to the field of germanium extraction methods in non-ferrous metallurgical technology. The method includes the following steps: mixing germanium-containing fly ash with a sulfiding agent and pressing it into block form; placing the block form in a flash Joule thermal device and applying a high-intensity current under vacuum for instantaneous thermal shock treatment, causing it to reach a peak temperature of 1500-3000℃ in a very short time; under this ultra-high temperature condition, the germanium-containing substances in the fly ash are rapidly sulfidated and converted into volatile GeS or GeS2, thereby achieving efficient separation and enrichment of germanium. This invention, through the synergistic innovation of Joule flash ultra-high temperature and a optimized sulfidation system, solves the technical bottlenecks of high acid consumption and low recovery rate in traditional wet processes and high energy consumption and long cycle time in traditional pyrometallurgical processes. This method has a short process flow, high germanium volatilization recovery rate, and reduced energy consumption, providing a new path for the high-value-added resource utilization of fly ash.
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