Electrorefining of aluminum in urea-imidazole chloride-aluminum chloride ionic liquids

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.

喷砂机模型气固两相流数值模拟及PIV实验验证

喷砂机内部颗粒撞击壁面是其失效的主要原因.为研究喷砂机内颗粒的运动规律,使用EDEM-Fluent耦合方法计算分析喷砂机模型内部气固两相流动特点.采用粒子图像测速(PIV)法,测量喷砂机内部颗粒运动情况以验证模型的有效性.结果表明:高速气体进入喷砂机后,在内部轴截面上产生一个带动底部颗粒运动、随时间逐渐稳定的主要漩涡,水平面上形成一个位于几何中心的漩涡;颗粒在入口气体的带动下,被吹起的高度逐渐稳定,运动速度是邻近气流速度的8%~10%;模拟结果和实验结果的局部误差和整体误差均小于10%,表明耦合计算方法是切实可行的.

基于YAG∶Ce3+荧光粉复合Eu3+掺杂荧光玻璃的激光照明器件

采用结晶法和低温共烧结法制备了Eu3+掺杂的Y3Al5O12∶Ce^3+荧光玻璃,对制备出的样品进行能量色散X射线谱和光致发光光谱测试,表明稀土离子Eu^3+与YAG∶Ce^3+荧光粉已掺入荧光玻璃。掺杂不同含量Eu2O3的YAG∶Ce^3+荧光玻璃封装成的激光照明器件在驱动电流100mA下,经过STC-4000快速光谱仪和PMS-80可见光谱分析系统测试,掺杂质量分数1%YAG∶Ce^3+复合质量分数9%的Eu3+的荧光玻璃封装的激光照明器件发光效率为267.1lm/W。激光照明器件随着电流的增加,其显色指数逐渐增大,但增加幅度较小。