Selective dissolution of the cobalt binder from scraps of cemented tungsten carbide in acids containing additives

Jing Chie Lin, Jain Yuan Lin, Shie Peir Jou

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

Scraps of cemented tungsten carbide were electrolyzed to dissolve their cobalt binder and recover tungsten carbide. Anodic passivation retards the acid dissolution of the cobalt. Anodic linear sweep and cyclic voltammetry were conducted for selecting adequate electrolytes, in which the passivation was diminished and thus the cobalt dissolution was enhanced. Anodic passivity of the scrap in acids was minimized in the presence of additives (e.g. 0.1 M citric acid in 1 M HCl). More effective electrolysis was carried out potentiostatically at 0.200-0.600 V (vs. SCE). A flowsheet to recover the tungsten carbide and cobalt from scraps of cemented tungsten carbide is suggested.

Original languageEnglish
Pages (from-to)47-61
Number of pages15
JournalHydrometallurgy
Volume43
Issue number1-3
DOIs
StatePublished - Nov 1996

Fingerprint

Dive into the research topics of 'Selective dissolution of the cobalt binder from scraps of cemented tungsten carbide in acids containing additives'. Together they form a unique fingerprint.

Cite this