Study on the Leaching Behavior of Key Metals in Nickel-based Single Crystal Superalloy Scraps
SHAN Guolei1,2,3,4, WANG Long3,5, SUN Yuan3,5, CHEN Zhenbin1,2, LI Xiaoming4,6, ZHANG Hongyu3,5, PEI Xiaoyao3,5
1 College of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2 State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China 3 Joint Innovation Laboratory for Green Comprehensive Utilization of Superalloy Secondary Resources, Shenyang 110016, China 4 Gansu Yinguang Chemical Industry Group Co. Ltd., Baiyin 730900, China 5 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 6 Baiyin Research Institute of Novel Materials of Lanzhou University of Technology, Baiyin 730900, China
Abstract: The rapid leaching of key metals was carried out in atmospheric ternary oxide leaching system from nickel-based single crystal superalloy scrap. Experimental factors involved in the leaching process, including stirring speed, leaching time, volume of hydrochloric acid, nitric acid and hydrogen peroxide were studied. The results show that the leaching ratio of Ni, Co, Cr, and Re was higher than 95%, and the leaching ratio of W was 53% under conditions at V(HNO3)/V(H2O) of 0.24, V(H2O2)/V(H2O) of 0.24, V(HCl)/V(H2O) of 2, stirring speed at 200 r/min, and leaching time of 3 min. Based on the above results, the kinetic model of leaching process, the occurrence state of key metals, oxidation dissolution mechanism and main components of leaching residue of superalloy scraps were further discussed. The results revealed that the chemical control model was more suitable to describe leaching behavior of Ni, Co, Cr, Re, W. The key metals, such as Ni, Co, Cr and Re, mainly existed as MxCly form, and the W was in form of tungstate. While the main components of leaching residue were WO3, TaO and Ta2O5. Besides, the content of each substance in leaching residue was inversely proportional to the content of corresponding ion in leaching solution.
单国雷, 王龙, 孙元, 陈振斌, 李晓明, 张洪宇, 裴逍遥. 镍基单晶高温合金资源中关键金属的浸出行为研究[J]. 材料导报, 2021, 35(10): 10134-10140.
SHAN Guolei, WANG Long, SUN Yuan, CHEN Zhenbin, LI Xiaoming, ZHANG Hongyu, PEI Xiaoyao. Study on the Leaching Behavior of Key Metals in Nickel-based Single Crystal Superalloy Scraps. Materials Reports, 2021, 35(10): 10134-10140.
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2021, Vol. 35 
