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<p>Germanium (Ge), with the properties of an excellent semiconductor, has been receiving increasing attention from countries all over the world. Lignite with high Ge content in specific coalfields has been reported more recently. In this study, high-Ge lignite was collected from Wulantuga coalfield to study modes of Ge occurrence using gravity separation and hydrogen peroxide oxidation. The enrichment of Ge in lignite was confirmed by physical separation and sequential chemical extraction experiments. The results showed that Ge was successfully enriched in the low-density fractions with enrichment ratios up to 3.16. Then, low-temperature ashing (LTA) and hydrogen peroxide oxidation were designed to analyze Ge in organic matter. After low-temperature ashing, Ge in organic matter was uniformly dispersed on the mineral surface, especially iron minerals. The lignite was gradually decomposed in hydrogen peroxide solution with Ge increasingly leached out. The leaching rate of Ge in the &lt; 1.4&#xa0;g/cm<sup>3</sup> fraction finally reached 95.61% under reaction for 24&#xa0;h at 60&#xa0;℃. Ge was mainly combined with oxygen-containing functional groups such as –OH and –COOH in the organic matter fraction. This study can provide a theoretical basis for the occurrence mode of Ge and a new possibility to extract Ge from germanium-rich lignite.</p>

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Study on Mode of Occurrence of Ge in Lignite with Gravity Separation and Hydrogen Peroxide Oxidation

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • Yijie Gao,
  • Jinhe Pan,
  • Lei Zhang,
  • Mengmeng Shi,
  • Changchun Zhou,
  • Hangchao Chen,
  • Xin Long,
  • Dmitrii Valeev,
  • Jinpeng Feng

摘要

Germanium (Ge), with the properties of an excellent semiconductor, has been receiving increasing attention from countries all over the world. Lignite with high Ge content in specific coalfields has been reported more recently. In this study, high-Ge lignite was collected from Wulantuga coalfield to study modes of Ge occurrence using gravity separation and hydrogen peroxide oxidation. The enrichment of Ge in lignite was confirmed by physical separation and sequential chemical extraction experiments. The results showed that Ge was successfully enriched in the low-density fractions with enrichment ratios up to 3.16. Then, low-temperature ashing (LTA) and hydrogen peroxide oxidation were designed to analyze Ge in organic matter. After low-temperature ashing, Ge in organic matter was uniformly dispersed on the mineral surface, especially iron minerals. The lignite was gradually decomposed in hydrogen peroxide solution with Ge increasingly leached out. The leaching rate of Ge in the < 1.4 g/cm3 fraction finally reached 95.61% under reaction for 24 h at 60 ℃. Ge was mainly combined with oxygen-containing functional groups such as –OH and –COOH in the organic matter fraction. This study can provide a theoretical basis for the occurrence mode of Ge and a new possibility to extract Ge from germanium-rich lignite.