Under the new development philosophy of carbon peaking and carbon neutrality,CO_(2)and O_(2)in situ leaching(ISL)has been identified as a promising technique for uranium mining in China,not only because it solves carb...Under the new development philosophy of carbon peaking and carbon neutrality,CO_(2)and O_(2)in situ leaching(ISL)has been identified as a promising technique for uranium mining in China,not only because it solves carbon dioxide utilization and sequestration,but it also alleviates the environmental burden.However,significant challenges exist in assessment of CO_(2)footprint and water-rock interactions,due to complex geochemical processes.Herein this study conducts a three-dimensional,multicomponent reactive transport model(RTM)of a field-scale CO_(2)and O_(2)ISL process at a typical sandstone-hosted uranium deposit in Songliao Basin,China.Numerical simulations are performed to provide new insight into quantitative interpretation of the greenhouse gas(CO_(2))footprint and environmental impact(SO_(4)^(2–))of the CO_(2)and O_(2)ISL,considering the potential chemical reaction network for uranium recovery at the field scale.RTM results demonstrate that the fate of the CO_(2)could be summarized as injected CO_(2)dissolution,dissolved CO_(2)mineralization and storage of CO_(2)as a gas phase during the CO_(2)and O_(2)ISL process.Furthermore,compared to acid ISL,CO_(2)and O_(2)ISL has a potentially smaller environmental footprint,with 20%of SO_(4)^(2–)concentration in the aquifer.The findings improve our fundamental understanding of carbon utilization in a long-term CO_(2)and O_(2)ISL system and provide important environmental implications when considering complex geochemical processes.展开更多
在高等教育入学人数不断增加、规模不断扩大的同时,高等教育的性质也在不知不觉中发生着变化,[1]学生的声音需要得到时刻的关注。联合国教科文组织在1998年首届世界高等教育大会上发布的《21世纪高等教育世界宣言:展望和行动》(World De...在高等教育入学人数不断增加、规模不断扩大的同时,高等教育的性质也在不知不觉中发生着变化,[1]学生的声音需要得到时刻的关注。联合国教科文组织在1998年首届世界高等教育大会上发布的《21世纪高等教育世界宣言:展望和行动》(World Declaration on Higher Education for the Twenty-First Century:Vision and Action)中提到21世纪世界高等教育需要将学生和他们的需求放在中心位置,学生有权利代表自己,应保证学生的参与,[2]体现的就是“以学生为中心”(Student-Centered)的理念。展开更多
基金supported by the National Natural Science Foundation of China(Grant No.U2167212)。
文摘Under the new development philosophy of carbon peaking and carbon neutrality,CO_(2)and O_(2)in situ leaching(ISL)has been identified as a promising technique for uranium mining in China,not only because it solves carbon dioxide utilization and sequestration,but it also alleviates the environmental burden.However,significant challenges exist in assessment of CO_(2)footprint and water-rock interactions,due to complex geochemical processes.Herein this study conducts a three-dimensional,multicomponent reactive transport model(RTM)of a field-scale CO_(2)and O_(2)ISL process at a typical sandstone-hosted uranium deposit in Songliao Basin,China.Numerical simulations are performed to provide new insight into quantitative interpretation of the greenhouse gas(CO_(2))footprint and environmental impact(SO_(4)^(2–))of the CO_(2)and O_(2)ISL,considering the potential chemical reaction network for uranium recovery at the field scale.RTM results demonstrate that the fate of the CO_(2)could be summarized as injected CO_(2)dissolution,dissolved CO_(2)mineralization and storage of CO_(2)as a gas phase during the CO_(2)and O_(2)ISL process.Furthermore,compared to acid ISL,CO_(2)and O_(2)ISL has a potentially smaller environmental footprint,with 20%of SO_(4)^(2–)concentration in the aquifer.The findings improve our fundamental understanding of carbon utilization in a long-term CO_(2)and O_(2)ISL system and provide important environmental implications when considering complex geochemical processes.
文摘在高等教育入学人数不断增加、规模不断扩大的同时,高等教育的性质也在不知不觉中发生着变化,[1]学生的声音需要得到时刻的关注。联合国教科文组织在1998年首届世界高等教育大会上发布的《21世纪高等教育世界宣言:展望和行动》(World Declaration on Higher Education for the Twenty-First Century:Vision and Action)中提到21世纪世界高等教育需要将学生和他们的需求放在中心位置,学生有权利代表自己,应保证学生的参与,[2]体现的就是“以学生为中心”(Student-Centered)的理念。
