A two-step alkaline-acidic leaching process was conducted to separate the cryolite from spent pot lining and to purify the carbon. The influencing factors of temperature, time, and the ratio of liquid to solid in alka...A two-step alkaline-acidic leaching process was conducted to separate the cryolite from spent pot lining and to purify the carbon. The influencing factors of temperature, time, and the ratio of liquid to solid in alkaline and acidic leaching were investigated. The results show that the recovery of soluble compounds of Na3AlF6 and Al2O3 dissolving into the solution during the NaOH leaching is 65.0%,and the purity of carbon reaches 72.7%. During the next step of HCl leaching, the recovery of soluble compounds of CaF2 and NaAl11O17 dissolving into the HCl solution is 96.2%, and the carbon purity increases to 96.4%. By mixing the acidic leaching solution and the alkaline leaching solution, the cryolite precipitates under a suitable conditions of pH value 9 at 70 °C for 2 h. The cryolite precipitating rate is 95.6%, and the purity of Na3AlF6 obtained is 96.4%.展开更多
以Al In Mg合金为基础,选择添加Pb、Mn、Sn制备了4类铝合金阳极材料。通过自腐蚀、开路电位、阳极极化方式研究了该系列合金阳极在c(NaOH)=4mol/L溶液中的电化学腐蚀行为,初步分析了合金成分、介质温度及溶液缓蚀剂对合金阳极性能的影...以Al In Mg合金为基础,选择添加Pb、Mn、Sn制备了4类铝合金阳极材料。通过自腐蚀、开路电位、阳极极化方式研究了该系列合金阳极在c(NaOH)=4mol/L溶液中的电化学腐蚀行为,初步分析了合金成分、介质温度及溶液缓蚀剂对合金阳极性能的影响。结果发现:制备的3#(Al In Mg Sn)合金、4#(Al In Mg Sn Pb)合金阳极在c(NaOH)=4mol/L+c(Na2SnO3)=0.04mol/L溶液中表现出更好的电化学性能,具有比纯铝(99.95%)更负的开路电位,更小的自腐蚀速率和更低的阳极极化。展开更多
基金Project (50804010) supported by the National Natural Science Foundation of China
文摘A two-step alkaline-acidic leaching process was conducted to separate the cryolite from spent pot lining and to purify the carbon. The influencing factors of temperature, time, and the ratio of liquid to solid in alkaline and acidic leaching were investigated. The results show that the recovery of soluble compounds of Na3AlF6 and Al2O3 dissolving into the solution during the NaOH leaching is 65.0%,and the purity of carbon reaches 72.7%. During the next step of HCl leaching, the recovery of soluble compounds of CaF2 and NaAl11O17 dissolving into the HCl solution is 96.2%, and the carbon purity increases to 96.4%. By mixing the acidic leaching solution and the alkaline leaching solution, the cryolite precipitates under a suitable conditions of pH value 9 at 70 °C for 2 h. The cryolite precipitating rate is 95.6%, and the purity of Na3AlF6 obtained is 96.4%.
文摘以Al In Mg合金为基础,选择添加Pb、Mn、Sn制备了4类铝合金阳极材料。通过自腐蚀、开路电位、阳极极化方式研究了该系列合金阳极在c(NaOH)=4mol/L溶液中的电化学腐蚀行为,初步分析了合金成分、介质温度及溶液缓蚀剂对合金阳极性能的影响。结果发现:制备的3#(Al In Mg Sn)合金、4#(Al In Mg Sn Pb)合金阳极在c(NaOH)=4mol/L+c(Na2SnO3)=0.04mol/L溶液中表现出更好的电化学性能,具有比纯铝(99.95%)更负的开路电位,更小的自腐蚀速率和更低的阳极极化。
