Recovery of Nickel from Nickel-Based Superalloy Scraps by Utilizing Molten Zinc

Selective anodic treatment of W(WC)-based superalloy scrap

“…Anodic behavior of superalloy samples. It has been shown that anodic polarization curve of all superalloys, demonstrates behavior characteristic for passivating materials with one or more dissolution peaks and significant passivation plateau, which is in agreement with the literature [13,14].…”

“…Upon potential shift above +1250 mV, an undesired process of tungsten oxidation along with oxygen evolution occurs. Thus, the anodic oxidation at high potentials leads to oxidation of tungsten-containing solid component, which has not been considered in the work [13]. As a result, all components of superalloy have been oxidized.…”

“…It has been proposed to utilize electrochemical dissolution of superalloy scrap in acidic solutions [11], including under controlled potential [13]. However, the detailed analysis of papers shows, that anodic dissolution is proposed to be conducted at the current density of 3-5 A/dm 2 , while anode potential (superalloy) reaches 1500-2000 mV.…”

Definition of synthesis parameters of ultrafine nickel powder by direct electrolysis for application in superalloy production

“…Many methods for the preparation of ultrafine nickel powder have been developed [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. In [26], the evaporation-condensation method is proposed, however, this method requires special equipment and the process must be conducted under inert atmosphere.…”

“…In [26], the evaporation-condensation method is proposed, however, this method requires special equipment and the process must be conducted under inert atmosphere. A method was developed for processing of solid nickel waste by treating them with molten metals [27], with zinc in particular [28]. The method consists in dissolving nickel in molten metal and then stripping the metal and obtaining nickel powder.…”