Abstract
Bearing significant concentrations of high value and critical metals, superalloy scraps require comprehensive recycling for metal reclamation. In this study, nickel-based superalloy was treated with molten Mg-Zn for the selective extraction of nickel. The influence of heating temperature, the molar ratio of Mg to Zn in the molten metal, Mg-Zn/superalloy mass ratio, and heating time on metal extraction were investigated. Using the heating temperature of 800 °C, the Mg/Zn molar ratio of 9/1, the Mg-Zn/superalloy mass ratio of 5/1, and heating time of 240 min, the extraction rate of 97.1% was achieved for Ni, and the extraction rates of Fe, Cr and refractory metals (Nb, Mo and Ti) were all less than 1%. In the subsequent vacuum distillation process, nickel with a purity of 98.3 wt% was obtained. Therefore, the proposed method is a short, clean, and efficient process for selectively extracting nickel from the superalloy scraps.
Highlights
Ni-based superalloy is the core material for manufacturing hot-end parts of aerospace engines and large power equipment, which contains a large amount of nickel, cobalt, and rare elements such as molybdenum, rhenium, tungsten, and hafnium [3]
A large amount of alloy scraps is generated during the processing and use of nickel-based superalloys
To overcome the hurdles mentioned above, we propose to use molten Mg-Zn as the extraction medium
Summary
The Inconel 718 superalloy was purchased from Dongbei Special Steel Group Co., Ltd, 2.1. Co., intended avoid 718 the process of cleaning the surface for Dongbei the removal of oxides scraps It will ensure the quality of the investigation by offering a uniform was intendedand to avoid the shape. ProcessThese of cleaning the surface for the of oxides from composition a regular superalloy bars were cut removal by a numerical control scraps. It will ensure the quality of the investigation by offering machining into a cylindrical shape (diameter 10.6 mm, height 4–10 mm). Mg ingots by Sinopharm Chemical Reagent Co., Ltd, Shanghai, China. Zn shots (>99.9% purity) were provided by Sinopharm Chemical Reagent Co., Ltd, Shanghai, China
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