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With the world in transition to a low-carbonCarbon economy, the needs in critical metalsCritical metal especially copperCopper and nickelNickel and in CO2 sequestrationCO2 sequestration are dramatically increasing. ChalcopyriteChalcopyrite and pentlanditePentlandite are important resources of copperCopper and nickelNickel resources, respectively. In addition to the copperCopper and nickelNickel from the sulfideSulfide minerals, the ironIron from chalcopyriteChalcopyrite and pentlanditePentlandite and the magnesium from the gangue minerals may be used to sequester CO2 into ironIron and magnesium carbonates for permanentPermanent CO2 storage while conventionally they are considered as impuritiesImpurity and are rejected as waste. In addition, the sulfideSulfide minerals in waste stockpiles usually induce a concern on potential acid mineMine drainage. In fact, the sulfurSulfur from sulfideSulfide minerals can be potentially utilized to directly capture CO2 from air while maintaining the stockpiles in neutral to weakly alkaline conditions. This work presents a novel and sustainable approach that can selectively extract critical metalsCritical metal including copperCopper and nickelNickel from low-gradeGrade sulfideSulfide resources for enhanced critical metalCritical metal recoveryRecovery and to simultaneously achieve CO2 mineralization for carbonCarbon-neutrality production. This novel process comprises the steps of leachingLeaching the feedstock comprising at least one of chalcopyriteChalcopyrite, pentlanditePentlandite, and gangue minerals in a leach solution producing a metalsMetal-containing leach solution, wherein the sulfideSulfide from the chalcopyriteChalcopyrite, pentlanditePentlandite, and ironIron-sulfideSulfide minerals sequesters CO2 as bicarbonate ions and the ironIron from chalcopyriteChalcopyrite and pentlanditePentlandite or the magnesium from the gangue minerals sequesters CO2 into ironIron and magnesium carbonates into the leach residue as stable CO2 storage; recovering copperCopper and nickelNickel from the metalMetal-containing leach solution producing high-value copperCopper and nickelNickel products and a copperCopper and nickelNickel depleted solution; and recyclingRecycling the metalMetal-depleted solution to the leachingLeaching step without chemical consumption. Therefore, this novel work for the integrated copperCopper and nickelNickel recoveryRecovery from sulfideSulfide resources and CO2 sequestrationCO2 sequestration can make a significant contribution to the robust and sustainable production of copperCopper and nickelNickel and carbonCarbon neutrality.

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Recovery of Copper and Nickel from Sulfide Minerals Coupled with Atmospheric CO2 Sequestration

  • 会议论文

  • 发表日期：

    2025年

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  • Fei Wang,
  • Mojtaba Adelalipour,
  • Kourosh Javdantabar

摘要

With the world in transition to a low-carbonCarbon economy, the needs in critical metalsCritical metal especially copperCopper and nickelNickel and in CO2 sequestrationCO2 sequestration are dramatically increasing. ChalcopyriteChalcopyrite and pentlanditePentlandite are important resources of copperCopper and nickelNickel resources, respectively. In addition to the copperCopper and nickelNickel from the sulfideSulfide minerals, the ironIron from chalcopyriteChalcopyrite and pentlanditePentlandite and the magnesium from the gangue minerals may be used to sequester CO2 into ironIron and magnesium carbonates for permanentPermanent CO2 storage while conventionally they are considered as impuritiesImpurity and are rejected as waste. In addition, the sulfideSulfide minerals in waste stockpiles usually induce a concern on potential acid mineMine drainage. In fact, the sulfurSulfur from sulfideSulfide minerals can be potentially utilized to directly capture CO2 from air while maintaining the stockpiles in neutral to weakly alkaline conditions. This work presents a novel and sustainable approach that can selectively extract critical metalsCritical metal including copperCopper and nickelNickel from low-gradeGrade sulfideSulfide resources for enhanced critical metalCritical metal recoveryRecovery and to simultaneously achieve CO2 mineralization for carbonCarbon-neutrality production. This novel process comprises the steps of leachingLeaching the feedstock comprising at least one of chalcopyriteChalcopyrite, pentlanditePentlandite, and gangue minerals in a leach solution producing a metalsMetal-containing leach solution, wherein the sulfideSulfide from the chalcopyriteChalcopyrite, pentlanditePentlandite, and ironIron-sulfideSulfide minerals sequesters CO2 as bicarbonate ions and the ironIron from chalcopyriteChalcopyrite and pentlanditePentlandite or the magnesium from the gangue minerals sequesters CO2 into ironIron and magnesium carbonates into the leach residue as stable CO2 storage; recovering copperCopper and nickelNickel from the metalMetal-containing leach solution producing high-value copperCopper and nickelNickel products and a copperCopper and nickelNickel depleted solution; and recyclingRecycling the metalMetal-depleted solution to the leachingLeaching step without chemical consumption. Therefore, this novel work for the integrated copperCopper and nickelNickel recoveryRecovery from sulfideSulfide resources and CO2 sequestrationCO2 sequestration can make a significant contribution to the robust and sustainable production of copperCopper and nickelNickel and carbonCarbon neutrality.