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·ore strongly affect the environmental impacts of the process The global warming potential in the direct leaching route was determined to vary between t CO 100% sulfide oxidation gold was assumed to be very finely distributed in the sulfides and gold leaching was assumed to be comparable to the dissolution degree of the host
Acid leaching and dissolution of major sulphide ore minerals processes and galvanic effects in complex systems Volume 68 Issue 2 Our systems are now restored following recent technical disruption and we re working hard to catch up on publishing We apologise for the inconvenience caused Find out more https //
·The basic and important step in gold self leaching is sulfide ore oxidation which not only affects the exposure of gold but also influences the production of thiosulfate But the iron oxide passivation hinders the further oxidation of sulfide ore The effect of carbonate addition on iron dissolution in gold self leaching was studied under
Gold occurrences normally as electrum are noticeable in various type of ore often in minor amounts as fine disseminated particles up to 200 μm infilling fractures pits and interstices throughout quartz carbonate and sulfide minerals
·According to a recent article by Hong Qin Xueyi Guo Qinghua Tian Dawei Yu and Lei Zhang of the School of Metallurgy and Environment Central South University China recovering gold from sulphide refractory gold ore is an important guarantee for the sustainable development of the gold industry in the future
·In this study the flotation behaviors of gold and gold associated sulfide minerals pyrite and sphalerite in a polymetallic sulfide gold ore were investigated using flotation kinetics parameters It was found that high gold recovery >90% can be achieved by the selective flotation of pyrite and sphalerite
·Processing refractory ores often requires pre treatment steps such as roasting pressure oxidation or bioleaching to alter the chemical state of the ore and liberate the gold for recovery
·Gold a significant precious metal has high corrosion resistance excellent electrical and thermal conductivity [] In the field of gold extraction and smelting refractory gold ore is one of the most important gold resources at present [] Approximately 30% of the world s gold production is derived from refractory gold ore and this proportion is expected to increase even
Alternative Lixiviants to Cyanide for Leaching Gold Ores Aylmore in Gold Ore Processing Second Edition 2016 Platsol Process The Platsol process was originally developed in collaboration with the University of British Columbia Kane Consultants Ltd and Lakefield Research in Canada for the treatment of flotation sulfide concentrate for Polymet Mining
·High sulfide gold ore refers to 20% 30% of gold wrapped by sulfide mainly pyrite It is better to use gravity separation flotation or flotation cyanidation process The following is an analysis of specific beneficiation tests and introduces four commonly used gold processing methods for high sulfide gold ores
·Nitric acid was also beneficial for the recovery of gold above about 400 g/L 906 S M Bulatovic 60 [3 Gold ore from Nevada 50 0 Gold ore from Indonesia 40 30 20 0 10 o 10 15 20 25 30 35 Flotation pulp density [%] Fig 16 Effect of pulp density on weight recovery in the sulphide concentrate 90 80 ILI 70 60 A NH4CI C3 00 HNO 3 0 CUSO
·contained the gold could not be chemically changed Testwork was undertaken to develop a flowsheet that would maximise gold recovery from an ore containing 3 g/t Au and high levels of arsenic Treatment of the sulphide ore involves gravity separation flotation and cyanide leaching
·Gold in sulfide ores and technogenic formations after their processing is concentrated in the form of micro dispersed particles This article presents a study on the composition of the ultrafine
·Magma transports metals to the Earth s surface to form ore deposits but only sulphide undersaturated magmas were thought to be capable of generating large amounts of ore Laboratory experiments
·In this process gold could be effectively recovered from the sulfide refractory gold ore with a recovery efficiency of % View Show abstract
·Sulfides are ubiquitous in various metal deposits and are usually important carriers of useful metal elements Jean and Michael 1985 Hyland and Bancroft 1989 Maddox et al 1998 Abraitis et al 2004 Deditius et al 2008 Prol Ledesma et al 2010 Pyrite the primary sulfide mineral in gold deposits also serves as the principal carrier of gold with approximately
·Gold particles in an ore deposit will vary in size from large nuggets to particles locked in the crystal lattice of sulfide minerals These sulfide minerals are referred to as gold carrier minerals and contain trace to minor amounts of gold Taggart 1927 Chryssoulis and Cabri 1990 Often it is found that gold ores are refractory due to the small size of the gold
·A gold carbonaceous sulphide ore from California carrying free gold yielded a 93 per cent recovery into a concentrate at 1 to ratio of concentration after conditioning with lb per ton of reagent 645 In each case the ore was ground to about 70 per cent minus 200 mesh and conditioned at 22 per cent solids with the reagents as indicated
·The pretreatment of refractory gold ore is a complex chemical process In addition to the oxidation of pyrite some side reactions also occur The phase changes of refractory gold ore before and after pretreatment are shown in Fig 11 The main phases of refractory gold ore include quartz SiO 2 pyrite FeS 2 and dolomite CaMg CO 3 2
·The inhibition of gold leaching occurs due to the passivation of Au metal gold sulphide minerals and oxidized Au ore The gold element s passivation is related to the adsorption of hydroxyl ions on the Au surface Ozone accelerates the oxidation of pyrite and also the direct production of ferric ions and sulphuric acid
4 ·Flotation test work on high throughput Ore B indicated that gold can also be concentrated to an extent by concentrating the sulphide component in the ore to mass pulls of 15 to 30 wt% with gold recovery of 60 to 70% Maximum Au Ag and sulphide recoveries of 70% 45% and 89% respectively were obtained at a grind size of P 80 of 70µm at a
·The proven reserves of ore gold in this zone are concentrated mainly within the large gold deposits of Krasnoyarsk the Sakha Republic Yakutia Magadan Transbaikalia and Irkutsk Gold sulphide deposits are some of the main geological and industrial deposits in the carbonaceous terrigenous strata of this region
·Refractory gold ore is usually affected by the associated carbonaceous matter through the preg robbing effect which is eliminated by oxidation roasting followed by leaching to achieve a satisfactory gold leaching efficiency Roasting leaching experiments pore structure measurements scanning electron microscopy SEM and X ray diffraction are used to explore
The metamorphosed Boliden volcanic hosted massive sulfide VHMS ore deposit northern Sweden is characterized by an abundance of massive arsenopyrite ore and unusually high gold enrichments up to 300 600 g/t in crosscutting veins and fracture zones The ore textures observed record progressive recrystallization and porphyroblast growth
Metallic ore deposits contain many different sulfide and related ore minerals Most are quite rare The table seen here lists the more important species Pyrite also called fool s gold is seen in Figure The specimen in the photo has pyrite s typical metallic golden color Figures and Chapter 3 show other views of
