FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W123799135> ?p ?o ?g. }

• W123799135 abstract "Many particle properties critical to the flotation process originate from the comminution stage. A better understanding of how these properties are affected by the methods of particle size reduction used will help determine whether current strategies for comminuting ores can be modified to further enhance particle floatabilities. This thesis investigates how different comminution mechanisms affect the properties of ore and mineral particles and assesses how changes to these properties subsequently affect flotation performance downstream. Three ores were selected for this study: Northparkes (a low-grade, copper porphyry ore); Ernest Henry (an iron-oxide hosted copper-gold ore); and Century (a high-grade strataform zinc ore). These were each comminuted to various particle size distributions using a hammer mill and a piston-die compression unit (simulating the breakage mechanisms used by high pressure grinding rolls). Progeny particles were then characterised using the JKMRC’s mineral liberation analyser (MLA) on a size-by-size basis. It was found that size-by-size liberation properties were independent of both the mechanism used to comminute the ore samples, as well as the final size distribution of the progeny particles. This was observed for both valuable and gangue mineral phases. Variations in the liberation properties of a mineral in a given size fraction were explained in terms of the effect of mineral grade upon the statistical uncertainties of liberation measurements. Rather than being dependent on the method of breakage used to comminute an ore, liberation properties were instead found to be dependent on the mechanical properties of associated mineral phases. Where large differences existed between the mechanical properties of associated minerals, the “harder” mineral was found to be conserved during the breakage process, deporting directly to high-grade liberation classes upon size reduction without forming composite particles. These effects were not observed for “softer” minerals. The mechanism of comminution used was not found to have any effect on the liberation properties of the discharge particles. However, relationships were found between the shape properties of particles (quantified using the MLA) and the breakage devices from which they were discharged. Samples comminuted in the hammer mill were found to be comparatively more round than those discharged from the piston-die compression unit which, conversely, were more angular. This was attributed to rebreakage events during the hammer mill grinding process whereby topographical features on particle surfaces (such as sharp edges and corners) were chipped away, resulting in the production of round, spherical particles. The effect of particle angularity on flotation performance was subsequently tested by floating sized, fully liberated chalcopyrite particles that were comminuted in either the hammer mill or piston-die compression unit, and retrospectively analysing the angularity properties of the timed concentrates. It was found that, in the absence of collector, angular chalcopyrite particles exhibited faster flotation kinetics than comparatively round particles, likely due to the enhancement of particle-bubble adhesion mechanics as hypothesised by past studies. Additionally, surface chemistry analysis conducted in collaboration with the Ian Wark Research Institute also showed that the comparatively angular concentrates also had higher degrees of surface coverage by hydrophobic polysulphide species, and this is also likely to have contributed to their faster flotation kinetics. The results of this thesis clearly show that mineral liberation properties cannot be controlled by the method of breakage used. However, it is expected that the results will aid in the development of both empirical as well as fundamental mineral liberation models. Additionally, it is shown that a potential method of enhancing particle floatability during the comminution stage is through the manipulation of particle shape properties. This has important implications for the development of property-based flotation models as well as for the eventual integration of comminution and flotation models." @default.
• W123799135 created "2016-06-24" @default.
• W123799135 creator A5001454548 @default.
• W123799135 date "2010-09-01" @default.
• W123799135 modified "2023-09-23" @default.
• W123799135 title "The Effect of Comminution Mechanism on Particle Properties: Consequences for Downstream Flotation Performance" @default.
• W123799135 hasPublicationYear "2010" @default.
• W123799135 type Work @default.
• W123799135 sameAs 123799135 @default.
• W123799135 citedByCount "1" @default.
• W123799135 countsByYear W1237991352015 @default.
• W123799135 crossrefType "journal-article" @default.
• W123799135 hasAuthorship W123799135A5001454548 @default.
• W123799135 hasConcept C111368507 @default.
• W123799135 hasConcept C127313418 @default.
• W123799135 hasConcept C147789679 @default.
• W123799135 hasConcept C159985019 @default.
• W123799135 hasConcept C185592680 @default.
• W123799135 hasConcept C187530423 @default.
• W123799135 hasConcept C191897082 @default.
• W123799135 hasConcept C192562407 @default.
• W123799135 hasConcept C199289684 @default.
• W123799135 hasConcept C25115569 @default.
• W123799135 hasConcept C2776432453 @default.
• W123799135 hasConcept C2776989763 @default.
• W123799135 hasConcept C2777571299 @default.
• W123799135 hasConcept C2778517922 @default.
• W123799135 hasConcept C2779015675 @default.
• W123799135 hasConcept C2779748816 @default.
• W123799135 hasConcept C2780952559 @default.
• W123799135 hasConcept C60448018 @default.
• W123799135 hasConcept C7028197 @default.
• W123799135 hasConceptScore W123799135C111368507 @default.
• W123799135 hasConceptScore W123799135C127313418 @default.
• W123799135 hasConceptScore W123799135C147789679 @default.
• W123799135 hasConceptScore W123799135C159985019 @default.
• W123799135 hasConceptScore W123799135C185592680 @default.
• W123799135 hasConceptScore W123799135C187530423 @default.
• W123799135 hasConceptScore W123799135C191897082 @default.
• W123799135 hasConceptScore W123799135C192562407 @default.
• W123799135 hasConceptScore W123799135C199289684 @default.
• W123799135 hasConceptScore W123799135C25115569 @default.
• W123799135 hasConceptScore W123799135C2776432453 @default.
• W123799135 hasConceptScore W123799135C2776989763 @default.
• W123799135 hasConceptScore W123799135C2777571299 @default.
• W123799135 hasConceptScore W123799135C2778517922 @default.
• W123799135 hasConceptScore W123799135C2779015675 @default.
• W123799135 hasConceptScore W123799135C2779748816 @default.
• W123799135 hasConceptScore W123799135C2780952559 @default.
• W123799135 hasConceptScore W123799135C60448018 @default.
• W123799135 hasConceptScore W123799135C7028197 @default.
• W123799135 hasLocation W1237991351 @default.
• W123799135 hasOpenAccess W123799135 @default.
• W123799135 hasPrimaryLocation W1237991351 @default.
• W123799135 hasRelatedWork W1804849457 @default.
• W123799135 hasRelatedWork W1964111533 @default.
• W123799135 hasRelatedWork W1973224630 @default.
• W123799135 hasRelatedWork W1973777631 @default.
• W123799135 hasRelatedWork W1991722200 @default.
• W123799135 hasRelatedWork W1996564859 @default.
• W123799135 hasRelatedWork W1998187263 @default.
• W123799135 hasRelatedWork W2044230251 @default.
• W123799135 hasRelatedWork W2318481818 @default.
• W123799135 hasRelatedWork W2718045237 @default.
• W123799135 hasRelatedWork W2730428278 @default.
• W123799135 hasRelatedWork W2868545028 @default.
• W123799135 hasRelatedWork W2897457041 @default.
• W123799135 hasRelatedWork W30833968 @default.
• W123799135 hasRelatedWork W3085214532 @default.
• W123799135 hasRelatedWork W3129824139 @default.
• W123799135 hasRelatedWork W3133817974 @default.
• W123799135 hasRelatedWork W3136617639 @default.
• W123799135 hasRelatedWork W3202855955 @default.
• W123799135 hasRelatedWork W70413882 @default.
• W123799135 isParatext "false" @default.
• W123799135 isRetracted "false" @default.
• W123799135 magId "123799135" @default.
• W123799135 workType "article" @default.