|About this Abstract
||Part C-3: Processing of Critical Metals
||Scrap Recycling of Tungsten-Based Secondary Material for the Recovery of Tungsten Monocarbide (WC) and Other Valuable Constituents Using an Acid Leach Process: A Preliminary Study
||Alan Shemi, Sehliselo Ndlovu, Natasha Sacks
|On-Site Speaker (Planned)
Tungsten carbide scrap (WC-Co) is reject material from the production process and industry. Tungsten (W) ores contain about 3wt% WO3 and their W concentrates about 10-75wt% WO3. Tungsten carbide scrap typically contains 40-95wt% W. The high intrinsic value of W and the fact that the least valuable scrap contains more W than an average ore makes tungsten carbide scrap worthy material for re-use. This study investigates the selective dissolution of the cobalt (Co) binder phase, recovery of tungsten monocarbide (WC) and Co using a complexing agent-aided acid leach process. The Co component is selectively leached and dissolved chemically, leaving the WC solid particles intact. The optimal dissolution of the Co binder phase using an inorganic acid in conjunction with an organic complexing agent such as lactic, tartaric or maleic acid is a relatively novel approach with potential of reduced leaching times and possibility of regenerating the unreacted organic acid.
||Planned: At-meeting proceedings