Renewable energy storage technologies are critical for transitioning to sustainable energy systems,with salt caverns playing a significant role in large-scale solutions.In water-soluble mining of low-grade salt format...Renewable energy storage technologies are critical for transitioning to sustainable energy systems,with salt caverns playing a significant role in large-scale solutions.In water-soluble mining of low-grade salt formations,insoluble impurities and interlayers detach during salt dissolution and accumulate as sediment at the cavern base,thereby reducing the storage capacity and economic viability of salt cavern gas storage(SCGS).This study investigates sediment formation mechanisms,void distribution,and voidage in the Huai'an low-grade salt mine,introducing a novel self-developed physical simulation device for two butted-well horizontal(TWH)caverns that replicates compressed air injection and brine discharge.Experiments comparing“one injection and one discharge”and“two injections and one discharge”modes revealed that(1)compressed air effectively displaces brine from sediment voids,(2)a 0.5 MPa injection pressure corresponds to a 10.3 MPa operational lower limit in practice,aligning with field data,and(3)sediment voidage is approximately 46%,validated via air-brine interface theory.The“two injections and one discharge”mode outperformed in both discharge volume and rate.Additionally,a mathematical model for brine displacement via compressed air was established.These results provide foundational insights for optimizing compressed air energy storage(CAES)in low-grade salt mines,advancing their role in renewable energy integration.展开更多
Fluidized bioleaching is an efficient,environmentally friendly,and cost-effective mining method that has been widely explored and utilized for recovering low-grade copper sulfide minerals,such as chalcopyrite.However,...Fluidized bioleaching is an efficient,environmentally friendly,and cost-effective mining method that has been widely explored and utilized for recovering low-grade copper sulfide minerals,such as chalcopyrite.However,the proliferation and apoptosis of dominant leaching bacteria,such as Acidithiobacillus ferrooxidans,within complex pore,void,and fracture structures in deep-earth environments commonly results in a dynamic bacterial community that evolves continuously.This unclear genetic-scale microbial succession often leads to low leaching reaction efficiency,undesirable reaction passivation,and poor bioleaching operations.This review integrates genetic-scale insights with industrial challenges in chalcopyrite bioleaching,proposing novel strategies for regulating microbial communities.A systematic analysis of five critical dimensions is conducted,focusing on:1)The adaptations of Acidithiobacillus spp.to high Ag^(+) stress.2)The direct,indirect,and cooperative bioleaching pathways are linked to bacterial extracellular polymer substance(EPS)and Fe/S oxidation genes.3)The passivation dynamics governed by bacterial genomics,including thiosulfate,polysulfide,and biofilm mechanisms.4)The microbial succession patterns under genetic control Hi-C sequencing-guided consortia design.5)Molecular detection methods(16S rDNA,Hi-C)for optimizing leaching efficiency.The following innovations have been identified as being of key significance:A genomic-environmental interaction model has been developed to bridge the gap between bacterial genetics and passivation dynamics.A comprehensive analysis of Ag^(+) catalysis has been conducted,resulting in a 40%reduction in jarosite formation through jar gene suppression.Practical strategies,such as thermophilic consortia engineering,have been validated in pilot trials,achieving a 32%increase in copper recovery.Additionally,this study meticulously reviews and summarizes typical potential stimulations and enhanced bioleaching methods.The genetic sequencing methods,such as 16S rDNA and Hi-C,have been shown to hold promising potential for improving bioleaching reactions and delaying the formation of passivation substances like jarosite.展开更多
基金financial support from the National Key Research and Development Program of China(No.2024YFB4007100)the Basic ForwardLooking Project of the Sinopec Science and Technology Department,“Research on the Long-Term Sealing Mechanism of Multi-layer Salt Cavern Hydrogen Storage”(No.P24197-4)。
文摘Renewable energy storage technologies are critical for transitioning to sustainable energy systems,with salt caverns playing a significant role in large-scale solutions.In water-soluble mining of low-grade salt formations,insoluble impurities and interlayers detach during salt dissolution and accumulate as sediment at the cavern base,thereby reducing the storage capacity and economic viability of salt cavern gas storage(SCGS).This study investigates sediment formation mechanisms,void distribution,and voidage in the Huai'an low-grade salt mine,introducing a novel self-developed physical simulation device for two butted-well horizontal(TWH)caverns that replicates compressed air injection and brine discharge.Experiments comparing“one injection and one discharge”and“two injections and one discharge”modes revealed that(1)compressed air effectively displaces brine from sediment voids,(2)a 0.5 MPa injection pressure corresponds to a 10.3 MPa operational lower limit in practice,aligning with field data,and(3)sediment voidage is approximately 46%,validated via air-brine interface theory.The“two injections and one discharge”mode outperformed in both discharge volume and rate.Additionally,a mathematical model for brine displacement via compressed air was established.These results provide foundational insights for optimizing compressed air energy storage(CAES)in low-grade salt mines,advancing their role in renewable energy integration.
基金funded by the Deep Earth Probe and Mineral Resources Exploration-National Science and Technology Major Project(No.2025ZD1010904)Interdisciplinary Research Project for Young Teachers of USTB(Fundamental Research Funds for the Central Universities,No.FRF-IDRY-24-016)+3 种基金Beijing Natural Science Foundation(No.2232080)the National Natural Science Foundation of China(Nos.52374112,52204124,52034001,and 52304144)the State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering(No.SDGZ2517)the Shandong Provincial Natural Science Foundation(No.ZR2023QE133)
文摘Fluidized bioleaching is an efficient,environmentally friendly,and cost-effective mining method that has been widely explored and utilized for recovering low-grade copper sulfide minerals,such as chalcopyrite.However,the proliferation and apoptosis of dominant leaching bacteria,such as Acidithiobacillus ferrooxidans,within complex pore,void,and fracture structures in deep-earth environments commonly results in a dynamic bacterial community that evolves continuously.This unclear genetic-scale microbial succession often leads to low leaching reaction efficiency,undesirable reaction passivation,and poor bioleaching operations.This review integrates genetic-scale insights with industrial challenges in chalcopyrite bioleaching,proposing novel strategies for regulating microbial communities.A systematic analysis of five critical dimensions is conducted,focusing on:1)The adaptations of Acidithiobacillus spp.to high Ag^(+) stress.2)The direct,indirect,and cooperative bioleaching pathways are linked to bacterial extracellular polymer substance(EPS)and Fe/S oxidation genes.3)The passivation dynamics governed by bacterial genomics,including thiosulfate,polysulfide,and biofilm mechanisms.4)The microbial succession patterns under genetic control Hi-C sequencing-guided consortia design.5)Molecular detection methods(16S rDNA,Hi-C)for optimizing leaching efficiency.The following innovations have been identified as being of key significance:A genomic-environmental interaction model has been developed to bridge the gap between bacterial genetics and passivation dynamics.A comprehensive analysis of Ag^(+) catalysis has been conducted,resulting in a 40%reduction in jarosite formation through jar gene suppression.Practical strategies,such as thermophilic consortia engineering,have been validated in pilot trials,achieving a 32%increase in copper recovery.Additionally,this study meticulously reviews and summarizes typical potential stimulations and enhanced bioleaching methods.The genetic sequencing methods,such as 16S rDNA and Hi-C,have been shown to hold promising potential for improving bioleaching reactions and delaying the formation of passivation substances like jarosite.
