Comprehensive utilization method of beneficiation-metallurgy-chemical combination for germanium-rich lignite

A beneficiation-metallurgy-chemical combination method for a germanium-rich lignite, comprising the following steps:

• 1) performing a mineral processing classification on the germanium-rich lignite to remove mud particles to obtain an oversize product, and grinding the oversize product to obtain a raw lignite;
• 2) mixing the raw lignite, hydrogen peroxide, and a ferrous ion solution to perform a catalytic pre-oxidation, performing a first solid-liquid separation to obtain an activated solution and an activated lignite residue, and returning the activated solution to the catalytic pre-oxidation step for a first recycling, to obtain a first preliminarily enriched germanium bearing solution;
• 3) performing a germanium leaching on the activated lignite residue with nitric acid, performing a second solid-liquid separation to obtain a germanium bearing solution and a humic acid-rich solid product with a high degree of depolymerization, and returning the germanium bearing solution to the germanium leaching step for a second recycling, to obtain a second preliminarily enriched germanium bearing solution;
• and
• 4) performing an adsorption with an anion exchange resin on the first preliminarily enriched germanium bearing solution and the second preliminarily enriched germanium bearing solution separately or on a combination of the first preliminarily enriched germanium bearing solution and the second preliminarily enriched germanium bearing solution, and performing an elution to obtain a germanium-rich solution, wherein
• a molar ratio of the hydrogen peroxide to ferrous ions in the ferrous ion solution is (35-60):1.