精炼渣是钢渣的一种,由于其CaO和MgO等碱性成分含量较高,可以用于捕获CO2.本文研究了水热预处理对提高富铝精炼渣CO2捕获容量的积极效果,分析了水热预处理时间、固液比、CO2流量、反应时间和温度等工艺条件对CO2捕获容量的影响,并结合XR...精炼渣是钢渣的一种,由于其CaO和MgO等碱性成分含量较高,可以用于捕获CO2.本文研究了水热预处理对提高富铝精炼渣CO2捕获容量的积极效果,分析了水热预处理时间、固液比、CO2流量、反应时间和温度等工艺条件对CO2捕获容量的影响,并结合XRD和FESEM分析阐明了水热预处理提高富铝精炼渣碳酸化程度的机理.研究结果表明:水热预处理精炼渣在常温常压条件下,最大的CO2捕获容量为0.126 g CO2/g渣,远远高于未经预处理渣的最大捕获容量0.042gCO2/g渣;水热预处理使渣中的C12A7快速水化,生成薄片状产物,增大了渣与CO2反应的面积,抑制了渣颗粒表面碳酸钙膜的形成,增大了反应速度,从而提高了反应程度.展开更多
The electrochemical behavior of Al(Ⅲ)in urea-1-butyl-3-methylimidazolium chloride-aluminum chloride(urea-BMIC-AlCl_(3))ionic liquids,and the effect of potential and temperature on the characterization of cathode prod...The electrochemical behavior of Al(Ⅲ)in urea-1-butyl-3-methylimidazolium chloride-aluminum chloride(urea-BMIC-AlCl_(3))ionic liquids,and the effect of potential and temperature on the characterization of cathode products,current efficiency and energy consumption of aluminum electrorefining have been investigated.Cyclic voltammetry showed that the electrochemical reduction of Al(Ⅲ)was a one-step three-electron-transfer irreversible reaction,and the electrochemical reaction was controlled by diffusion.The diffusion coefficient of Al(Ⅲ)in urea-BMIC-AlCl_(3)ionic liquids at 313 K was 1.94×10^(−7)cm^(2)/s.The 7075 aluminum alloy was used as an anode for electrorefining,and the cathode products were analyzed by XRD,SEM and EDS.The results from XRD analysis indicated that the main phase of the cathode products was aluminum.The results from SEM and EDS characterization revealed that the cathode product obtained by electrorefining−1.2 V(vs.Al)was dense and uniform,and the mass fraction of aluminum decreased from 99.61%to 99.10%as the experimental temperature increased from 313 K to 333 K.In this work,the optimum experimental conditions were−1.2 V(vs.Al)and 313 K.At this time,the cathode current efficiency was 97.80%,while the energy consumption was 3.72 kW·h/kg.展开更多
文摘精炼渣是钢渣的一种,由于其CaO和MgO等碱性成分含量较高,可以用于捕获CO2.本文研究了水热预处理对提高富铝精炼渣CO2捕获容量的积极效果,分析了水热预处理时间、固液比、CO2流量、反应时间和温度等工艺条件对CO2捕获容量的影响,并结合XRD和FESEM分析阐明了水热预处理提高富铝精炼渣碳酸化程度的机理.研究结果表明:水热预处理精炼渣在常温常压条件下,最大的CO2捕获容量为0.126 g CO2/g渣,远远高于未经预处理渣的最大捕获容量0.042gCO2/g渣;水热预处理使渣中的C12A7快速水化,生成薄片状产物,增大了渣与CO2反应的面积,抑制了渣颗粒表面碳酸钙膜的形成,增大了反应速度,从而提高了反应程度.
基金Project(52004062)supported by the National Natural Science Foundation of ChinaProject(2020-MS-084)supported by the Natural Science Foundation of Liaoning Province,ChinaProject(N2125014)supported by the Fundamental Research Funds for the Central Universities,China。
文摘The electrochemical behavior of Al(Ⅲ)in urea-1-butyl-3-methylimidazolium chloride-aluminum chloride(urea-BMIC-AlCl_(3))ionic liquids,and the effect of potential and temperature on the characterization of cathode products,current efficiency and energy consumption of aluminum electrorefining have been investigated.Cyclic voltammetry showed that the electrochemical reduction of Al(Ⅲ)was a one-step three-electron-transfer irreversible reaction,and the electrochemical reaction was controlled by diffusion.The diffusion coefficient of Al(Ⅲ)in urea-BMIC-AlCl_(3)ionic liquids at 313 K was 1.94×10^(−7)cm^(2)/s.The 7075 aluminum alloy was used as an anode for electrorefining,and the cathode products were analyzed by XRD,SEM and EDS.The results from XRD analysis indicated that the main phase of the cathode products was aluminum.The results from SEM and EDS characterization revealed that the cathode product obtained by electrorefining−1.2 V(vs.Al)was dense and uniform,and the mass fraction of aluminum decreased from 99.61%to 99.10%as the experimental temperature increased from 313 K to 333 K.In this work,the optimum experimental conditions were−1.2 V(vs.Al)and 313 K.At this time,the cathode current efficiency was 97.80%,while the energy consumption was 3.72 kW·h/kg.
