Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 22 for “"pentlandite"”.
-
Pentlandite-pyroxene and pentlandite-feldspar interactions and their effect on separation by flotation
… be managed so as to increase the separation of pentlandite from pyroxene and feldspar. The aim was to minimise the percentage pyroxene and feldspar reporting to the concentrate and simultaneously maximise the pentlandite recovery. The possible chemical reactions taking place on surfaces of …
-
Characterization of pentlandite-bearing quartz veins of Kambalda, Western Australia
… barren quartz veins, auriferous quartz veins and pentlandite-bearing quartz veins. Timing and formation conditions of these quartz veins are unknown and pentlandite-bearing quartz veins are of particular interest as pentlandite usually occurs in magmatic or volcanic settings, such as layered …
-
On the selective flotation of pentlandite from pyrrhotite in Sheba's Ridge ores
… (BMS) content in the BIC is comprised of pentlandite, pyrrhotite and chalcopyrite. Sheba's Ridge, one of the ore deposits found in the BIC, is exploited for its PGEs and PGMs. For typical PGE processing operations like the Merensky reef, the valuable PGEs and PGMs are associated with the …
-
The role of complexing agents in the flotation of pentlandite-pyroxene mixtures
… examines the role complexing agents play in pentlandite-pyroxene flotation and focuses on the surface chemistry and interaction between valuable and gangue minerals as well as the interaction of complexing agents and reagents (xanthate, copper sulphate) in the system at pH 9. Microflotation, …
-
An Electrochemical Study of the Oxidative Dissolution of Synthetic Nickel-Iron Sulphide Minerals in Aqueous Media
Pentlandite (Fe4.5Ni4.5S8) and violarite (FeNi2S4) were synthesized by dry in vacuo techniques. The products were analysed by reflected light microscopy, powder X-ray diffraction and electron microprobe analysis. The synthetic pentlandite was found to have an average stoichiometry of …
-
An investigation into the process mineralogy of the Merensky reef at Northam Platinum Limited
… of the base metal sulphides (chalcopyrite, pentlandite, pyrrhotite and total sulphide) as well as through investigation of mass-water recoveries.
-
High tenor NI-PGE sulfide mineralization of the south manasan ultramafic intrusion, Thompson Nickel Belt, Manitoba
… by an intercumulate texture is dominated by pentlandite with accessory pyrite; the latter having a symplectic-like texture. The pentlandite-pyrite assemblage in the serpentinized dunite, although still characterized overall by an intercumlate-texture, has well developed platy intergrowths …
-
The use of sulfide mineral chemistry to understand PGE mineralization processes in the Northern Limb of the Bushveld Igneous Complex
… elements) of major sulfides: pyrrhotite (Po), pentlandite (Pn), and chalcopyrite (Ccp) in Platreef samples intersected by Ivanplats during deep drilling in the Turfspruit area. A drill core (UMT094), for which Sr and S isotope stratigraphy was collected previously, was used as reference because …
-
Control of Surface Chemistry of Gold, Pyrite and Pyrrhotite
Removing pyrite from coal and pyrrhotite from pentlandite play a critical role in coal and nickel production, respectively, to meet the stringent restriction on SO2 emission. The present project investigates first the mechanism of xanthate adsorption on gold using Atomic Force Microscope (AFM), …
-
Sulphide ore minerals:surface chemical properties
… pyrrhotine (Fe7Se), violarite (FeNi2S4), pentlandite ((FeiNi)9Se), chalcopyrite (CuFeS2) and arsenopyrite (FeAsS). The surfaces were oxidised by various methods including acid (sulphuric), alkali (ammonium hydroxide), hydrogen peroxide, steam, electrochemical and air/oxygen (in a …
-
The role of nitrogen on the flotation performance of a complex sulphide ore
… sulphides present in the ore; chalcopyrite (Cu), pentlandite (Ni) and pyrrhotite (Fe, as an approximate representative since Fe occurs in pyrrhotite, chalcopyrite, pentlandite as well as nonsulphide gangue). Secondly, to develop an understanding of the mechanisms of nitrogen addition on the …
-
Mineralogical effects on the dense medium separation of low grade nickel sulfide ore
… deposits with similar sulfide mineralogy and pentlandite as the main nickel host. A process mineralogy approach was used to evaluate samples of both ores, describing the differences in the mineralogical properties within the overflow and underflow of each ore in order to understand the extent …
-
Stratabound and Stratiform Sulphide Mineralisation in the Scottish Dalradian
… of other sulphide phases such as pyrite, pentlandite and pyrrhotite which are capable of carrying cobalt in substitution. The cobalt may have been sourced from mafic volcanic lithologies or from the basal units of the Dalradian Supergroup which were accessed through crustal thinning and …
-
Platinum-group elements in the ultrabasic rocks of the Braganca and Morais massifs, northern Portugal
… has caused recrystallisation of much original pentlandite to heazlewoodite and magnetite. At the same time Pd-bearing alloys were created, mostly adjacent to sulphide grains with the source of the Pd being in solid solution within the base-metal sulphide. Several factors suggest that the …
-
The effect of energy input on flotation kinetics
… kinetics of sulphide minerals (galena, pyrite & pentlandite) and oxide minerals (apatite & hematite) in a laboratory scale oscillating grid flotation cell. The second objective was to compare the results from the laboratory OGC to comparative studies in the flotation literature and to fundamental …
-
Sulfide and Accessory Mineral Assemblages in the Sulfur-Poor Regions of the Stillwater Complex, Montana, USA
… interesting observations. An upwards trend from pentlandite-rich to pyrrhotite-rich to chalcopyrite + pyrite-rich assemblages is observed below the reef, and the same trend occurs above the reef with the transition occurring just below the reef, in upper GN-I. Trace element analysis shows that Cu …
-
A stepwise Study on the characterisation and processing of South African Platinum Group Tailings
… of any supporting elucidations, and also because pentlandite is the primary PGE-carrier for Merensky and UG2. The tailings were floated with DOW200 as the frother, SIBX as the collector, and CMC as the depressant. The results showed that the presence of the depressant resulted in very low solid …
-
Considering the action of frothers under degrading water quality
… involving the bulk flotation of chalcopyrite and pentlandite. Flotation performance was evaluated by examining the water, solids, copper and nickel recoveries, and the grades of both copper and nickel. The ore used for this study was Kevitsa ore from Finland. Both the individual effects of frother …
-
The effect of ion accumulation owing to water recycling on flotation performance
… the target metals, floated as chalcopyrite and pentlandite, respectively. Their recovery and grade under different conditions was used as a measure to quantify whether a threshold ion concentration existed. The key performance indicators used were: (a) water recovery, (b) solids recovery, (c) …
-
Petrology, geochemistry, stable and radiogenetic isotopy of the Guelb Moghrein iron oxide copper gold cobalt deposit, Mauritania
… Exsolution mineralogy includes troilite, pentlandite, cubanite, mackinawite and nickeline. This assemblage was formed in a temperature range of 200-250°C, under lower greenschist facies metamorphism, during D3. The isotopic composition of siderite from the breccia is characterized by …
Page 1 of 2