Method for extracting germanium from germanium-containing lignite through microwave pyrolysis, sulfuration and volatilization

Abstract

The invention relates to a method for extracting germanium from germanium-containing lignite through microwave pyrolysis, sulfuration and volatilization, which comprises the following steps of: drying, crushing and screening the germanium-containing lignite to obtain lignite powder; directly putting the lignite powder into a microwave pyrolyzing furnace or putting the lignite powder into the microwave pyrolyzing furnace after the lignite powder is formed, and introducing inert gas to replace air; the microwave pyrolysis furnace is started, the temperature is increased to the working temperature T, microwave pyrolysis reaction is carried out under the pyrolysis atmosphere with the gas flow rate controlled to be Q, and the microwave pyrolysis time is t; and the generated tar, pyrolysis gas and germanium-rich volatile matters are subjected to gradient collection through multi-stage condensation. The microwave pyrolysis technology is adopted, compared with traditional pyrolysis, the germanium volatilization temperature is reduced, the heat preservation time is shortened, the germanium volatilization rate is increased, the impurity rejection rate is high, the energy consumption is reduced by 50% or above, and the germanium sulfide enrichment multiple is increased by 3-5 times.

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