·Pyrite texture and gold occurrence The high grade >10 g/t gold ores have a mineral assemblage of pyrite arsenopyrite galena and sphalerite with minor native Au Fig 2a f The pyrite in
·Generally the technique of floating pyrite by selective depression of arsenopyrite using oxidizing agents in an alkaline medium is adopted in its separation [9] Under the treatment of oxidative depressants such as hydrogen peroxide permanganate and hypochlorite ferric hydroxide and arsenate species precipitate on the surface of the arsenopyrite to form a
·Characterisation of the flotation concentrate Fig 15a obtained from an operating mine showed that pyrite was the predominant sulphide mineral phase present followed by arsenopyrite in ratio
·Notwithstanding in the separation of gold bearing sulphides during froth flotation a concentrate made up of both pyrite and arsenopyrite is obtained due to their similar characteristics and
·A high floatability is desirable for arsenopyrite that is auriferous so as to increase the recovery of gold When the ore contains gold poor pyrite and arsenopyrite a pyrite arsenopyrite bulk concentrate is recovered first Further upgrading is accomplished through pyrite flotation and arsenopyrite depression
·Electron microprobe analysis shows that gold occurs in arsenopyrite and pyrite the gold contents of which can be up to 2700 g/t The gold and arsenic contents of these minerals are closely
The gold orebodies are strictly controlled by the NE NW and SN trending tensional and shearing faults with high dipping angle The mineralogy and geochemistry of pyrite and arsenopyrite are measured by electron microprobe Pyrite has up to wt % Au and arsenopyrite contains up to wt % Au
·To provide an understanding of the preferential interaction and flotation of Cu activated arsenopyrite compared to pyrite Cu species adsorbed extent of surface oxidation nature of bond and coordination between donor atoms of IPETC and Cu and As acceptor atoms on mineral surfaces was investigated using X ray photoelectrons spectroscopy XPS and
·Several flotation strategies for arsenopyrite have been developed over the last two decades For refractory gold ores containing arsenopyrite these flotation techniques have been found to have some limitations Pretreatment of the ore is necessary to enhance arsenopyrite flotation and thereby increase gold recovery In the present study ultrasonic
·A Brazilian mining company processes a very low grade gold ore part as free gold particles and part associated with pyrite and arsenopyrite The flotation of free gold and sulphides play an important role in this process allowing economic gold production from ores with grades as low as g/t
·Understanding the mechanism of arsenian pyrite flotation is particularly important given that it is the principal gold carrier in the very important submicron gold pyritic sedimentary hosted gold deposits In the case of mesothermal pyritic gold ores pyrite and arsenopyrite are sufficiently coarse grained
To further investigate the selectivity index the pyrite recovery/arsenopyrite recovery ratio of arsenopyrite and pyrite additional flotation tests were carried out on mixed sample of the two minerals Different from the flotation behavior of single minerals the results showed that the recovery of arsenopyrite was lower than that of
·In this work a multi technical bulk and surface analytical approach was used to investigate the bioleaching of a pyrite and arsenopyrite flotation concentrate with a mixed microflora mainly consisting of Acidithiobacillus ferrooxidans X ray diffraction X ray photoelectron spectroscopy XPS and X ray induced Auger electron spectroscopy mineral surfaces
2 ·The majority of gold ores are classified refractory because the gold mineralogy is contained in sulphides This type of gold is typically very fine gold or locked in solid solution within sulphide minerals pyrite and arsenopyrite FeAsS The arsenic bearing pyrite is flotation where gold can be concentrated in a small mass pull and reduce
DOI / Corpus ID 233630740; Differential flotation of pyrite and arsenopyrite Effect of hydrogen peroxide and collector type article{Forson2021DifferentialFO title={Differential flotation of pyrite and arsenopyrite Effect of hydrogen peroxide and collector type} author={Philip Forson and Massimiliano Zanin and William Skinner and Richmond K
·The results showed no pyrite and arsenopyrite flotation at pH 11 until CuSO4 × 10⁻⁵ mol/l addition where arsenopyrite displayed remarkably good CuSO4 concentration dependent flotation
·The nature of invisible gold and silver in pyrite and arsenopyrite have been investigated and shown in Table 3 Evidently arsenopyrite grains contain pronounced amount of gold than pyrite grains for all the investigated samples Gold concentration in some of the spots in pyrite were greater than that of arsenopyrite
·Laboratory and industrial scale experiments were conducted to investigate the effect of tertiary dodecyl mercaptan TDM as a collector on the flotation of auriferous pyrite and optimum recovery of gold associated with auriferous sulphides was obtained by adding a mixture of TDM and sodium butyl xanthate together with only a little CuSO 4 as an
The activation properties of ammonium oxalate on the flotation of pyrite and arsenopyrite in the lime system were studied in this work Single mineral flotation tests showed that the ammonium oxalate strongly activated pyrite in high alkalinity and high Ca<sup>2 </sup> system whereas arsenopyrite was almost unaffected In mineral mixtures tests the recovery difference between
·Practical aspects of gold flotation considered include the physical condition of the gold particles size shape zonal variations in composition composites surface coatings general ore mineralogy specific host minerals for gold pyrite arsenopyrite base metal sulphide minerals quartz interfering minerals pyrophyllite carbon and non ore materials cement fill mine
·The authors propose the process for selective flotation of auriferous pyrite and arsenopyrite where the combination of xanthate 2 hydroxylpropyl ester of diethyldithiocarbamate acid HPEDEDCA and oak bark extract OBE is used to produce pyrite concentrate recovered into the froth product The process provides the selective recovery of valuables into
