SF_(6) has excellent insulation performance and arc extinguishing ability,and is widely used in the power industry.However,its global warming potential is about 23,500 times that of C0_(2),it can exist stably in the a...SF_(6) has excellent insulation performance and arc extinguishing ability,and is widely used in the power industry.However,its global warming potential is about 23,500 times that of C0_(2),it can exist stably in the atmosphere,it is not easily degradable and is of great potential harm to the environment.Based on pulsed dielectric barrier discharge plasma technology,the effects of H_(2)O and 0_(2) on the degradation of SF_(6) were studied.Studies have shown that H_(2)O can effectively promote the decomposition of SF_(6) and improve its degradation rate and energy efficiency of degradation.Under the action of a pulse input voltage and input frequency of 15 kV and 15 kHz,respectively,when H_(2)O is added alone the effect of 1% H_(2)O is the best,and the rate and energy efficiency of degradation of SF_(6) reach their maximum values,which are 91.9% and 8.25 g kWh^(-1),respectively.The synergistic effect of H_(2)O and O_(2) on the degradation of SF_(6) was similar to that of H_(2)O.When the concentration of H_(2)O and O_(2) was 1%,the system obtained the best rate and energy efficiency of degradation,namely 89.7% and 8.05 g kWh~(-1),respectively.At the same time,different external gases exhibit different capabilities to regulate decomposition products.The addition of H_(2)O can effectively improve the selectivity of S0_(2).Under the synergistic effect of H_(2)O and O_(2),with increase in O_(2) concentration the degradation products gradually transformed into SO_(2)F_(2).From the perspective of harmless treatment of the degradation products of SF_(6),the addition of O_(2) during the SF_(6) degradation process should be avoided.展开更多
世界上典型热液脉型钴矿床,如五元素(Ag-Bi-Co-Ni-As±U)矿床,因其高的钴品位(高达8%)而具有重要的经济价值和研究意义,该类矿床以自然元素和砷化物组合为特征。不同于五元素矿床,湘东北横洞热液脉型钴矿床(中型,品位约0.04%)的矿...世界上典型热液脉型钴矿床,如五元素(Ag-Bi-Co-Ni-As±U)矿床,因其高的钴品位(高达8%)而具有重要的经济价值和研究意义,该类矿床以自然元素和砷化物组合为特征。不同于五元素矿床,湘东北横洞热液脉型钴矿床(中型,品位约0.04%)的矿石矿物组合为黄铁矿+黄铜矿+闪锌矿+方铅矿+磁黄铁矿,目前对该矿床中含钴矿物的特征及钴的富集机制尚不清楚。本文在详细的矿相学工作基础上,采用EPMA、EBSD、LA-ICPMS和LA-MC-ICPMS等多种分析方法,对其黄铁矿开展了精细结构、成分和硫同位素分析。将黄铁矿划分为PyI、PyII和PyIII三个世代。其中,PyII是Co的重要载体,常呈丝带状、不规则状或韵律环带交代PyI或呈细粒状产出,其Co含量高达52141×10^(-6),明显高于其他世代黄铁矿。黄铁矿中Co与Fe具有较好的负相关性,表明Co主要呈类质同象的形式置换Fe存于黄铁矿晶格中。而黄铁矿中高的Co/Ni比值(1.05~393)和Se含量(10.69×10^(-6)~129×10^(-6))则暗示了其热液成因。此外,PyII与PyI之间具有不规则港湾状接触界面、突变的化学成分以及相近的晶体取向,这些暗示了富钴的PyII系含钴流体与围岩及早阶段黄铁矿快速反应的产物,溶解再沉淀的动力学过程是控制PyII的形成机制。不同世代黄铁矿的δ34 S V-CDT值接近,变化范围为-13.12‰~-8.70‰,与围岩地层的硫同位素特征接近。结合湘东北结晶基底高的Co含量(30.4×10^(-6)~72.3×10^(-6))和以往流体包裹体显微测温结果,认为在晚侏罗世-早白垩世期间,NE-ENE向的长沙-平江断裂带走滑剪切活动使得深源热液流体从结晶基底连云山岩群活化萃取了金属钴,富钴热液沿走滑断裂向上运移至成矿部位,再因压力周期性变化引起流体发生不混溶作用进而分离,导致钴金属络合物失稳,最后钴沉淀富集成矿。通过与世界上典型热液脉型钴矿床成矿特征的对比,提出流体低的盐度和低砷、高硫的特征是造成横洞钴矿床矿物组合简单的主要控制因素。展开更多
基金supported by Guizhou Province (Ceneral), grant/award number Qian Ke He Zhi Cheng [2022] General 207, National Natural Science Foundation of China (No. 52307170)Natural Science Foundation of Hubei Province, China (No. 2023AFB382)。
文摘SF_(6) has excellent insulation performance and arc extinguishing ability,and is widely used in the power industry.However,its global warming potential is about 23,500 times that of C0_(2),it can exist stably in the atmosphere,it is not easily degradable and is of great potential harm to the environment.Based on pulsed dielectric barrier discharge plasma technology,the effects of H_(2)O and 0_(2) on the degradation of SF_(6) were studied.Studies have shown that H_(2)O can effectively promote the decomposition of SF_(6) and improve its degradation rate and energy efficiency of degradation.Under the action of a pulse input voltage and input frequency of 15 kV and 15 kHz,respectively,when H_(2)O is added alone the effect of 1% H_(2)O is the best,and the rate and energy efficiency of degradation of SF_(6) reach their maximum values,which are 91.9% and 8.25 g kWh^(-1),respectively.The synergistic effect of H_(2)O and O_(2) on the degradation of SF_(6) was similar to that of H_(2)O.When the concentration of H_(2)O and O_(2) was 1%,the system obtained the best rate and energy efficiency of degradation,namely 89.7% and 8.05 g kWh~(-1),respectively.At the same time,different external gases exhibit different capabilities to regulate decomposition products.The addition of H_(2)O can effectively improve the selectivity of S0_(2).Under the synergistic effect of H_(2)O and O_(2),with increase in O_(2) concentration the degradation products gradually transformed into SO_(2)F_(2).From the perspective of harmless treatment of the degradation products of SF_(6),the addition of O_(2) during the SF_(6) degradation process should be avoided.
文摘世界上典型热液脉型钴矿床,如五元素(Ag-Bi-Co-Ni-As±U)矿床,因其高的钴品位(高达8%)而具有重要的经济价值和研究意义,该类矿床以自然元素和砷化物组合为特征。不同于五元素矿床,湘东北横洞热液脉型钴矿床(中型,品位约0.04%)的矿石矿物组合为黄铁矿+黄铜矿+闪锌矿+方铅矿+磁黄铁矿,目前对该矿床中含钴矿物的特征及钴的富集机制尚不清楚。本文在详细的矿相学工作基础上,采用EPMA、EBSD、LA-ICPMS和LA-MC-ICPMS等多种分析方法,对其黄铁矿开展了精细结构、成分和硫同位素分析。将黄铁矿划分为PyI、PyII和PyIII三个世代。其中,PyII是Co的重要载体,常呈丝带状、不规则状或韵律环带交代PyI或呈细粒状产出,其Co含量高达52141×10^(-6),明显高于其他世代黄铁矿。黄铁矿中Co与Fe具有较好的负相关性,表明Co主要呈类质同象的形式置换Fe存于黄铁矿晶格中。而黄铁矿中高的Co/Ni比值(1.05~393)和Se含量(10.69×10^(-6)~129×10^(-6))则暗示了其热液成因。此外,PyII与PyI之间具有不规则港湾状接触界面、突变的化学成分以及相近的晶体取向,这些暗示了富钴的PyII系含钴流体与围岩及早阶段黄铁矿快速反应的产物,溶解再沉淀的动力学过程是控制PyII的形成机制。不同世代黄铁矿的δ34 S V-CDT值接近,变化范围为-13.12‰~-8.70‰,与围岩地层的硫同位素特征接近。结合湘东北结晶基底高的Co含量(30.4×10^(-6)~72.3×10^(-6))和以往流体包裹体显微测温结果,认为在晚侏罗世-早白垩世期间,NE-ENE向的长沙-平江断裂带走滑剪切活动使得深源热液流体从结晶基底连云山岩群活化萃取了金属钴,富钴热液沿走滑断裂向上运移至成矿部位,再因压力周期性变化引起流体发生不混溶作用进而分离,导致钴金属络合物失稳,最后钴沉淀富集成矿。通过与世界上典型热液脉型钴矿床成矿特征的对比,提出流体低的盐度和低砷、高硫的特征是造成横洞钴矿床矿物组合简单的主要控制因素。
