Featured Publications
This section shows key research publications from the Asamoah Research Lab. These studies involve key strategic partnerships, delivering practical solutions.
This study investigates the mechanism and kinetics of alkaline cyanide leaching of two refractory flotation gold concentrates and their bio-oxidised forms. Key variables—mineralogy, pH modifier, agitation, and time—were assessed. Results show ore-type dependence, limited mineral alteration, and distinct leaching models, highlighting challenges in gold recovery.
A detailed mineralogical and physico-chemical study of two refractory gold ores from Ghana revealed distinct cyanidation behaviors. Flotation yielded sulphide-silicate concentrates, with apatite in one and dolomite in the other. Bio-oxidation led to jarosite-bearing and jarosite-free products, respectively, impacting gold extraction. Jarosite hindered oxidation by encapsulating gold and promoting gangue agglomeration.
This study explores the leaching behavior of mechano-chemically activated, refractory, bio-oxidised gold concentrates. Activation reduced particle size, increased surface area, and caused mineral amorphisation. Gold yield rose up to 1.8× after 24 h of leaching. Improvements were linked to surface cleaning, pore formation, and disintegration of gold-gangue agglomerates, aiding gold recovery.
This study examines metal debris behavior in grinding and flotation circuits of three Australian concentrators. Findings show diverse metal morphologies, with debris from upstream equipment and grinding media circulating in the mill circuit. Some fines reach flotation, where they promote sulphide oxidation, potentially affecting flotation performance and overall process efficiency.
This study investigates the selectivity of O-isopropyl-N-ethyl thionocarbamate (IPETC) in separating pyrite and arsenopyrite during flotation. At pH 11, flotation was negligible without copper, but CuSOâ‚„ addition enhanced arsenopyrite recovery. IPETC adsorption favored copper-treated arsenopyrite due to sulfur-copper chelation and arsenic-nitrogen coordination, achieving 90% arsenopyrite and 11% pyrite recovery.