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DOI / Corpus ID 103922146; The effect of grinding chemistry on cyanide leaching of gold in the presence of pyrrhotite article{Rabieh2017TheEO title={The effect of grinding chemistry on cyanide leaching of gold in the presence of pyrrhotite} author={Alireza Rabieh and Jacques J Eksteen and Boris Albijanic}
·The synthetic ore was obtained by mixing 12 g of pyrrhotite 99% purity g of the gravity gold concentrate which contains 6% gold concentrate analysed by fire assay and g of quartz % purity Therefore the synthetic gold ore had 2% pyrrhotite and 50 ppm gold Table 1 shows the XRD analysis of the gold concentrate The 2% level of pyrrhotite was
·The possible loss of cyanide ion through the formation of such stable complexes as those indicated above increases the costs associated with reagent consumption and is a major variable in the financial viability of a gold operation [20] Such concerns have been repeated in a variety of reviews on gold treatment by cyanidation [1] [21] [22]
·Hereafter the term refractory will refer to ores whose mineralogical characteristics lower the efficiency of leaching processes De Michelis et al 2013 Fleming 1992 either because cyanidation results in a low precious metal extraction or due to an excessive cyanide consumption Deschênes et al 2011 which can eventually turn the
The effect of the metal to sulphur ratio in the nonstoichiometic compound pyrrhotite is related to the consumption of cyanide in gold leaching Reactive pyrrhotite Fe <SUB> I X </SUB>S is produced during the pyrolysis of refractory pyrite FeS <SUB>2</SUB> Iron vacancies give pyrrhotite its non stoichiometric nature and determine its fugacity and hence reactivity
·The effect of pyrite pyrrhotite chalcopyrite realgar and arsenopyrite on gold dissolution in cyanide media was investigated The cyanidation of synthetic gold ores in the presence of various
·The CLR is known for its high amenability to cyanide leaching while the VCR contains refractory minerals such as arsenides pyrite and pyrrhotite Gartz and Frimmel 1999 The BR is well known for its deleterious preg robbing effect due to abundant carbonaceous matter McLoughlin 2014 A geometallurgical comparison is significant for the
Semantic Scholar extracted view of "The effects of dissolved oxygen and cyanide dosage on gold extraction from a pyrrhotite rich ore" by S Ellis et al Skip to search form Skip to of a sulphide gold silver ore was investigated in terms of a relationship between gold and silver extractions and cyanide consumption Ninity five Au % and
·Figure 8 is a plot of hydroxide and cyanide consumption versus mass loss during cyanidation Clearly hydroxide consumption was highly dependent on the mass loss of pyrrhotite while cyanide consumption changed only slightly This indicates that under these experimental conditions more iron precipitated as hydroxide than dissolved as cyano
·The excess cyanide will consume more cyanide because of the formation of cyanocomplexes from impurities Figure 5 demonstrates the gold recovery as a function of the pH and leaching time when
Abstract The content of pyrrhotite in a primary gold mine containing pyrrhotite is % In the process of alkaline leaching pretreatment there are problems such as large ore quantity and high alkali consumption In the process of cyanide leaching there are problems such as high cyanide consumption and slow gold leaching rate
The general experience in gold cyanidation research activities and plant practice is that high oxygen and cyanide concentrations improve gold leaching kinetics which in turn reduce residence time and increase throughput This paper shows how the improved pre oxidation method for the pyrrhotite rich gold ore of Bounty Gold Mine has increased gold recoveries at lower reagent
·The cyanidation of such gold bearing pyrite with residual copper minerals incurs a high cyanide consumption due to undesirable side reactions of cyanide with these copper minerals as elaborated in the previous section Zhang et al 1997; Kianinia et al 2018 including reactions that result in cyanide soluble copper such as [Cu CN 3] 2
The effect of lead nitrate is subtler for chalcopyrite and pyrrhotite because it was less effective to retard the reaction of sulphides with cyanide and the reaction of iron with oxygen effect In one case study the lead nitrate treatment increased the overall gold extraction and decreased the cyanide consumption for an additional gross
·Since cyanide is an expensive reagent often a major component of plant operating costs it is important that the scale up of cyanide consumption from laboratory to plant be representative
·In addition the presence of sulphides leads to extra consumption of the cyanide leaching agent NaCN due to the formation of thiocyanate therefore increasing costs These types of gold sulphidic ores may be pre treated prior to cyanidation by means of an oxidation step converting the sulphides into oxides or sulphates
·The application of lead nitrate in combination with oxygen generated the best results Gold extraction of 96% can be obtained with cyanide consumption of kg/t and lime consumption of kg/t in 24 hours A four hour pre leach followed by cyanidation is required free cyanide concentration 480 ppm pH lead nitrate 200 g/t and 16 ppm
·Fig 2 shows the effect of realgar [AsS] pyrrhotite [FeS] chalcopyrite [CuFeS 2] pyrite Three approaches have proved to be very efficient in reducing cyanide consumption in gold plants and reducing the cost of effluent treatment for cyanide destruction the use of an online cyanide analyser oxygen enrichment of the pulp and the addition
·A pre leaching successfully hinders the effect of pyrite and pyrrhotite on cyanide consumption and leaching kinetics The pre leaching has no beneficial effect on chalcopyrite as far as cyanide consumption goes Additional work has to be conducted on sulphide minerals to characterize the processing parameters required to alleviate their
·cyanide Pyrrhotite >>> Marcasite > Arsenopyrite > Pyrite The addition of lead nitrate could have resulted in the passivation of these cyanide consumers resulting in a resulted in an g/t decrease in cyanide consumption This is probably due to the fact that less cyanide is lost as hydrogen cyanide gas at higher pH values At a pH of
·The content of pyrrhotite in a primary gold mine containing pyrrhotite is % In the process of alkaline leaching pretreatment there are problems such as large ore quantity and high alkali consumption In the process of cyanide leaching there are problems such as high cyanide consumption and slow gold leaching rate
·In a cyanide solutioi lead nitrate lead sulphide and lead sulphite react with gold to form AuPb2 AuPb3 and metallic lead which clearly accelerate the gold dissolution The nature of the sulphide
