Thermodynamic Analysis and Experimental Verification of Volatilization Enrichment of Germanium Oxide
Metal germanium is mainly extracted from germanium-containing lead and zinc ash.Due to the low content,the production process is long,reagent consumption is large,and the output of the wastes is large.In this paper,a new idea of sulfuration volatilization enrichment is put forward,and the thermodynamic simulation of the volatilization process of germanium and the verification experiment are carried out.The thermodynamic calculation shows that GeO2 can directly generate GeS,and the increase of temperature is conducive to the generation of GeS.In the GeO2-FeS2-C system,with the increase of temperature,GeO2 will preferentially vulcanize into GeS2,and with the increase of temperature,GeS2 will further decompose into GeS,and the increase of sulfurizing agent is conducive to the formation of GeS.Finally,pure GeS2,FeS2 and C powder were used as raw materials for sulfurizing roasting of Ge in the inert atmosphere of 900℃,and the volatilization rate of germanium reached 93.47%,which confirmed the feasibility of volatilization enrichment of germanium.
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