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9. The Effects of Pulp Rheology on Gravity Gold Recovery in Free Milling Gold Ore of the Tarkwaian Systems of Ghana.

Author

Agorhom, Eric Aminartey and Owusu, Clement

Subjects
*GOLD ores, *GOLD, *RHEOLOGY, *GRAVITY, *MINERALOGY, *MUSCOVITE, *MINERAL aggregates
Abstract

Gravity gold characterization provides a comprehensive understanding on the effect of mineralogy, particle size, and liberation on gravity concentrator performance. This is of significant economic importance for gold ores with a high amount of coarse gold particles. In this study, the effect of pulp rheology on gravity recoverable gold (GRG) was investigated using a single-stage GRG test on paleoplacer gold deposits of the Tarkwaian system of Ghana. The elemental and mineralogical composition of the gold ore was characterized using ICP-MS, XRD, and QEMSCAN analyses. Bench-scale gravity concentration was performed on the gold ore at varying clay contents (in the range of 5–30 wt.%) using Lab Knelson concentrator in the absence and presence of NaOH (2.5 kg/t) and CaO (2.5 kg/t). The mineralogical analysis showed the ore is oxidized and comprised 88% Quartz, 8% muscovite mica, 2% hematite, and 2% kaolinite. Liberation and association analyses showed 58% of the gold particles were liberated, 1% formed binary with quartz, and 41% formed complex aggregates with other mineral phases. The gravity concentration of the ore without clay material yielded 51% Au recovery (11.2 g/t) at the grind size of 80% passing 106 µm. Partial replacement of the ore with clay material at 5%, 10%, 15%, 20%, and 30% decreased gold recovery from 51% to 25.7%, 12.7%, 8.8%, 5.1%, and 1.5%, respectively. Subsequent conditioning of the slurry with NaOH improved gold recovery due to possible improvement in slurry rheology. However, the addition of CaO decreased gold recovery due to an increase in slurry viscosity. [ABSTRACT FROM AUTHOR] more...

Published
2022
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11. Free gold recovery : effects of gold composition and surface chemistry on flotation and collector adsorption properties

Author

Agorhom, Eric Aminartey and University of South Australia. Ian Wark Research Institute.

Subjects
Flotation, Copper ores, Separation (Technology)
Abstract

Thesis (PhD(Engineering(Minerals and Materials)))--University of South Australia, 2014. Includes bibliographical references (pages 155-170). There is a considerable challenge in maximising gold flotation (recovery and grade) in relation to copper flotation in porphyry copper-gold ores. This is due to differences in mineralogy, surface chemistry and morphology between gold and copper-bearing minerals. This is further complicated by the choice of reagents (e.g. collector) for Au due to the varying nature of Au particles (both native and electrum) in these ores. It is therefore imperative that optimising gold flotation recovery requires accurate and diagnostic mineralogical and surface characterisation to understand its occurrence, liberation and associations with both the host and gangue minerals. The trace and fine-sized nature of Au particles in these ores make mineralogical and surface characterisation difficult and, thus, also a challenge. In this thesis, mineralogical and surface analytical techniques together with flotation strategies (different collector regimes, regrinding and pyrite depression), were used to maximise Au flotation in a typical porphyry copper-gold without detrimental effect on Cu recoveries and rejecting significant pyrite. more...

Published
2014