真空区域熔炼法制备高纯铝过程中杂质的分布  

Impurity distribution in preparation of high-purity aluminum by vacuum zone melting

作　　者：段梦平 赵晋阳[1,2,3,4] 徐宝强 孔令鑫[1,2,3,4] 杨斌[1,2,3,4] 万贺利 付程程[2] Meng-ping DUAN;Jin-yang ZHAO;Bao-qiang XU;Ling-xin KONG;Bin YANG;He-li WAN;Cheng-cheng FU(National Engineering Research Center of Vacuum Metallurgy,Kunming University of Science and Technology,Kunming 650093,China;Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;Key Laboratory for Vacuum Metallurgy of Non-ferrous Metals of Yunnan Province,Kunming 650093,China;State Key Laboratory of Nonferrous Metal Resources Clean Utilization in Yunnan Province,Kunming 650093,China)

机构地区：[1]昆明理工大学真空冶金国家工程研究中心,昆明650093 [2]昆明理工大学冶金与能源工程学院,昆明650093 [3]云南省有色金属真空冶金重点实验室,昆明650093 [4]云南省有色金属资源清洁利用国家重点实验室,昆明650093

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第9期2843-2852,共10页中国有色金属学报（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(No.51734006);the Outstanding Youth Project of Yunnan Province,China(No.202001AV070002);the Fundamental Research Project of Yunnan Province,China(No.2019FD037).

摘　　要：提出一种真空区域熔炼法制备高纯铝的新工艺。通过确定平衡分配系数,研究杂质的轴向偏析。理论分析和实验结果表明,平衡分配系数k0<1的杂质(Cu、Si和Fe)在铝锭尾部累积,而Ti(k0>1)在铝锭首端累积。当熔区以1.5 mm/min的速度移动并进行15次区域熔炼后,杂质的去除率和铝的纯度最高。在铝锭中部,即距铝样首端140 mm处,铜、铁和硅的去除率均高于90%,钛的去除率高于75%,铝纯度高于99.999%。铝样品的纯度符合99.999%(5N)工业用高纯铝标准的要求。A novel vacuum zone melting process for preparing high-purity Al was proposed.The axial segregation of impurities was investigated by determining the equilibrium distribution coefficient.Theoretical and experimental results showed that impurities(Cu,Si,and Fe)with an equilibrium distribution coefficient k0<1 accumulated in the tail of the Al ingot,while Ti(k0>1)accumulated at the head end of the ingot.When the molten area moving at 1.5 mm/min and zone melting was performed 15 times,the removal rate of the impurities and the purity of Al were the highest.In the middle of the Al ingot,i.e.140 mm away from the head end of the sample,the removal rates of Cu,Fe,and Si were higher than 90%,that of Ti was higher than 75%,and the Al content was higher than 99.999%.The purity of the Al samples met the requirements of the commercial 99.999%(5N)high-purity Al standard.

关 键 词：真空区域熔炼 高纯铝 平衡分配系数 杂质净化 

分 类 号：TF821[冶金工程—有色金属冶金]