To recover metal from copper slags,a new process involving two steps of oxidative desulfurization followed by smelting reduction was proposed in which one hazardous waste(waste cathode carbon)was used to treat another...To recover metal from copper slags,a new process involving two steps of oxidative desulfurization followed by smelting reduction was proposed in which one hazardous waste(waste cathode carbon)was used to treat another(copper slags).The waste cathode carbon is used not only as a reducing agent but also as a fluxing agent to decrease slag melting point.Upon holding for 60 min in air atmosphere first and then smelting with 14.4 wt%waste cathode carbon and 25 wt%CaO for 180 min in high purity Ar atmosphere at 1450℃,the recovery rates of Cu and Fe reach 95.89%and 94.64%,respectively,and meanwhile greater than 90%of the fluoride from waste cathode carbon is transferred into the final slag as CaF_(2) and Ca_(2)Si_(2)F_(2)O_(7),which makes the content of soluble F in the slag meet the national emission standard.Besides,the sulphur content in the obtained Fe-Cu alloy is low to 0.03 wt%.展开更多
Electrochemical CO2 reduction(ECR)represents a promising strategy for utilizing CO2,an industrial waste,as an abundant and cheap carbon source for organic synthesis as well as storing intermittent renewable electricit...Electrochemical CO2 reduction(ECR)represents a promising strategy for utilizing CO2,an industrial waste,as an abundant and cheap carbon source for organic synthesis as well as storing intermittent renewable electricity from renewable sources.Efficient electrocatalysts allowing CO2 to be reduced selectively and actively are crucial since the ECR is a complex and sluggish process producing a variety of products.Metal-organic frameworks(MOFs)and covalentorganic frameworks(COFs)have emerged as versatile materials applicable in many fields due to their unique properties including high surface areas and tunable pore channels.Besides,the emerging reticular chemistry makes tuning their features on the atomic/molecular levels possible,thereby lending credence to the prospect of their utilizations.Herein,an overview of recent progress in employing framework material-based catalysts,including MOFs,COFs and their derivatives,for ECR is provided.The pertinent challenges,future trends,and opportunities associated with those systems are also discussed.展开更多
基金Project(U1602272)supported by the National Natural Science Foundation of China。
文摘To recover metal from copper slags,a new process involving two steps of oxidative desulfurization followed by smelting reduction was proposed in which one hazardous waste(waste cathode carbon)was used to treat another(copper slags).The waste cathode carbon is used not only as a reducing agent but also as a fluxing agent to decrease slag melting point.Upon holding for 60 min in air atmosphere first and then smelting with 14.4 wt%waste cathode carbon and 25 wt%CaO for 180 min in high purity Ar atmosphere at 1450℃,the recovery rates of Cu and Fe reach 95.89%and 94.64%,respectively,and meanwhile greater than 90%of the fluoride from waste cathode carbon is transferred into the final slag as CaF_(2) and Ca_(2)Si_(2)F_(2)O_(7),which makes the content of soluble F in the slag meet the national emission standard.Besides,the sulphur content in the obtained Fe-Cu alloy is low to 0.03 wt%.
基金financially supported by the National Natural Science Foundation of China(21671096 and 11775105)Shenzhen Peacock Plan(KQTD2016022620054656)。
文摘Electrochemical CO2 reduction(ECR)represents a promising strategy for utilizing CO2,an industrial waste,as an abundant and cheap carbon source for organic synthesis as well as storing intermittent renewable electricity from renewable sources.Efficient electrocatalysts allowing CO2 to be reduced selectively and actively are crucial since the ECR is a complex and sluggish process producing a variety of products.Metal-organic frameworks(MOFs)and covalentorganic frameworks(COFs)have emerged as versatile materials applicable in many fields due to their unique properties including high surface areas and tunable pore channels.Besides,the emerging reticular chemistry makes tuning their features on the atomic/molecular levels possible,thereby lending credence to the prospect of their utilizations.Herein,an overview of recent progress in employing framework material-based catalysts,including MOFs,COFs and their derivatives,for ECR is provided.The pertinent challenges,future trends,and opportunities associated with those systems are also discussed.
