Recovery of Nano-Sized Cobalt Powder from Cemented Carbide Scrap

Authors : Sebahattin GÜRMEN

Pages : 343-350

Doi:10.3906/vet-1102-795

View : 11 | Download : 4

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :A process is developed to recover nano-sized cobalt from cemented carbide scrap insert ignore into journalissuearticles values(WC-Co); by nitric acid leaching and finally obtaining a nano-sized spherical pure cobalt powder by ultrasonic spray pyrolysis insert ignore into journalissuearticles values(USP);. The optimization of the leaching and preparation of cobalt powders by USP are conducted within the framework of an environment-friendly and economical process, enabling reduced waste streams. According to the results obtained, it is possible to dissolve cobalt with high efficiencies insert ignore into journalissuearticles values(91.5%); via HNO3 leaching of cemented carbide scrap. The optimum leaching conditions were 90 m m, 25 °C, 2 h, 0.5 M HNO3, 900 rpm, and 1/10 solid/liquid ratio. The leach residue insert ignore into journalissuearticles values(WC-TiC); has a BET specific surface area of 1.08 m2/g and finds has a wide range of applications in key technologies, varying from mechanical to chemical industries. After leaching, nano-sized cobalt powder insert ignore into journalissuearticles values(300-700 nm); can be produced from Coinsert ignore into journalissuearticles values(NO3);2 by ultrasonic spray pyrolysis with hydrogen reduction. The nano-sized powders can be used for the production of new nano-structured thermoelectric materials, nanomagnets, nanosensors and nano-structured tungsten carbide-cobalt powders.
Keywords : Recovery, Hydrometallurgy, Ultrasonic spray pyrolysis, Nano sized cobalt powder