To investigate the effect of chlorine roasting on the migration and removal of trace elements in quartz lattice,firstly,an efficient pretreatment process,grinding–HCl washing–flotation–HF and HCl leaching,was used ...To investigate the effect of chlorine roasting on the migration and removal of trace elements in quartz lattice,firstly,an efficient pretreatment process,grinding–HCl washing–flotation–HF and HCl leaching,was used to remove the gangue minerals in quartz ore to obtain purified quartz for the preparation of high-purity quartz and the investigation of lattice impurities migration.The results showed that the high-purity quartz with total impurities less than 50μg/g could be obtained from purified quartz after being treated with chlorine at 1200°C.The variation of crystal structure and the lattice impurities migration of quartz during chlorine roasting were studied through in-situ XRD,TGA,SEM-EDS,ICP-MS,FT-IR and XPS analysis.It revealed that the decomposable impurities H_(2)O,-OH,and residual collectors in the crystal of purified quartz could be effectively removed through chlorine roasting above 900°C,which also had an obvious effect on the removal of low-valence trace elements Li,Na and K in the crystal of quartz but didn't affect the multivalent trace elements Al and Ti.This study revealed the removal and migration mechanism of the trace elements in quartz crystal during chlorine roasting.展开更多
Airlines and airports continuously improve operational efficiency and enhance service quality,especially through self-service technology(SST).Although there are several reviews on SST,the aviation industry has been co...Airlines and airports continuously improve operational efficiency and enhance service quality,especially through self-service technology(SST).Although there are several reviews on SST,the aviation industry has been com-paratively overlooked.This study offers a systematic review of the existing literature on aviation SST(e.g.,self-check-in kiosks and web/e-ticketing)from the customer service perspective.Starting from a rich dataset of 678 peer-reviewed journal articles listed in Scopus,after some screening processes,98 articles remained and were included in the full-text review and analysis.Accordingly,we found that the aviation SST literature focused on some geographical locations,e.g.,North America and Asia,but not others(e.g.,Africa or Oceania).Its three main research themes are customer adoption,customer satisfaction,and customer experience,in which the Technol-ogy Acceptance Model(TAM)is the dominant framework.In addition,the use of SST from the environmental perspective was rarely studied while newer SSTs such as customer service chatbots and biometric check-in will need more attention.展开更多
基金provided by the National Natural Science Foundation of China(No.52374273)the China Postdoctoral Science Foundation Project(No.2023M731041)。
文摘To investigate the effect of chlorine roasting on the migration and removal of trace elements in quartz lattice,firstly,an efficient pretreatment process,grinding–HCl washing–flotation–HF and HCl leaching,was used to remove the gangue minerals in quartz ore to obtain purified quartz for the preparation of high-purity quartz and the investigation of lattice impurities migration.The results showed that the high-purity quartz with total impurities less than 50μg/g could be obtained from purified quartz after being treated with chlorine at 1200°C.The variation of crystal structure and the lattice impurities migration of quartz during chlorine roasting were studied through in-situ XRD,TGA,SEM-EDS,ICP-MS,FT-IR and XPS analysis.It revealed that the decomposable impurities H_(2)O,-OH,and residual collectors in the crystal of purified quartz could be effectively removed through chlorine roasting above 900°C,which also had an obvious effect on the removal of low-valence trace elements Li,Na and K in the crystal of quartz but didn't affect the multivalent trace elements Al and Ti.This study revealed the removal and migration mechanism of the trace elements in quartz crystal during chlorine roasting.
文摘Airlines and airports continuously improve operational efficiency and enhance service quality,especially through self-service technology(SST).Although there are several reviews on SST,the aviation industry has been com-paratively overlooked.This study offers a systematic review of the existing literature on aviation SST(e.g.,self-check-in kiosks and web/e-ticketing)from the customer service perspective.Starting from a rich dataset of 678 peer-reviewed journal articles listed in Scopus,after some screening processes,98 articles remained and were included in the full-text review and analysis.Accordingly,we found that the aviation SST literature focused on some geographical locations,e.g.,North America and Asia,but not others(e.g.,Africa or Oceania).Its three main research themes are customer adoption,customer satisfaction,and customer experience,in which the Technol-ogy Acceptance Model(TAM)is the dominant framework.In addition,the use of SST from the environmental perspective was rarely studied while newer SSTs such as customer service chatbots and biometric check-in will need more attention.
