Global miningMining companies are paying a significant amount of money for maintaining and operating tailings storage facilities. The amount of economic and environmental impactsEnvironmental Impact can be innumerable when catastrophic failures happen. Due to the issues on access, stability of dam structures, battery limitations, and potential toxicity, it is difficult to access and reprocess tailings. CopperCopper mine tailingsMine Tailings from an active mineMine were used. CopperCopper content in the tails varied from 0.06% to 0.08% with relatively high sulfideSulfide sulfurSulfur content mainly from pyritePyrite. The value of copperCopper was extremely low, but the potential for acid mineMine drainage is high. Other metalsMetal with interest in tailings are arsenicArsenic, nickelNickel, and cobaltCobalt with very low concentrations. Conventional flotationFlotation for pyritePyrite was used to produce sulfide concentratesSulfide concentrate. All metalsMetal associated with pyritePyrite and other sulfidesSulfide were concentrated with 50% sulfideSulfide sulfurSulfur content. The concentratesConcentrate were biooxidized with a mixture of mesophilic microorganismsMicroorganisms. Metal extractionMetal extraction, particularly base metalsMetal such as copperCopper, nickelNickel, and cobaltCobalt, were high between 60 and 80%. The cleaner leached residues and flotationFlotation tails were combined to produce GeofoamGeofoam that can be used as thermal insulating material, concrete alternatives, cement clinker replacementReplacement, and materials for 3D printing. A pilot scale testworkTestwork has been completed successfully and onsite trial with modularModular units will soon follow. The overall process and economic evaluationEvaluation of the project will be discussed with metal recoveryMetal recovery, fabrication of value-added products, and CO2 sequestrationCO2 sequestration from tailing repurposing process.

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Mine Tailings Reprocessing and Repurposing with Mineral Processing and Extractive Metallurgy

  • Jaeheon Lee

摘要

Global miningMining companies are paying a significant amount of money for maintaining and operating tailings storage facilities. The amount of economic and environmental impactsEnvironmental Impact can be innumerable when catastrophic failures happen. Due to the issues on access, stability of dam structures, battery limitations, and potential toxicity, it is difficult to access and reprocess tailings. CopperCopper mine tailingsMine Tailings from an active mineMine were used. CopperCopper content in the tails varied from 0.06% to 0.08% with relatively high sulfideSulfide sulfurSulfur content mainly from pyritePyrite. The value of copperCopper was extremely low, but the potential for acid mineMine drainage is high. Other metalsMetal with interest in tailings are arsenicArsenic, nickelNickel, and cobaltCobalt with very low concentrations. Conventional flotationFlotation for pyritePyrite was used to produce sulfide concentratesSulfide concentrate. All metalsMetal associated with pyritePyrite and other sulfidesSulfide were concentrated with 50% sulfideSulfide sulfurSulfur content. The concentratesConcentrate were biooxidized with a mixture of mesophilic microorganismsMicroorganisms. Metal extractionMetal extraction, particularly base metalsMetal such as copperCopper, nickelNickel, and cobaltCobalt, were high between 60 and 80%. The cleaner leached residues and flotationFlotation tails were combined to produce GeofoamGeofoam that can be used as thermal insulating material, concrete alternatives, cement clinker replacementReplacement, and materials for 3D printing. A pilot scale testworkTestwork has been completed successfully and onsite trial with modularModular units will soon follow. The overall process and economic evaluationEvaluation of the project will be discussed with metal recoveryMetal recovery, fabrication of value-added products, and CO2 sequestrationCO2 sequestration from tailing repurposing process.