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Gold which has formed an alloy with other metal forming a solid solution is considered refractory, by definition if you can't get recoveries beyond 80% then you can call it a refractory ore, whether it's a mineral processing problem or not will depend on the type of refractory, I will consider a mineral processing problem those ores which have micro gold particles which cannot be …
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Ultra-fine grinding (P 80 10 m) has been proposed as an alternative to unlock gold from sulfidic refractory ores; however, the cost of size reduction to this level makes it applicable only for concentrates (Corrans and Angove, 1991; Gonzalez-Anaya et al., 2011), as is practiced at Kalgoorlie Consolidated Gold Mines, a joint venture between Barrick and Newmont.
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Abstract Refractory gold ores may be defined as those which yield low recoveries of gold when treated by the conventional grinding and cyanidation process. This refractory behaviour can vary from mild to severe with gold recoveries of 85% down to less than 30% [1]. A common cause of refractoriness is encapsulation of fine gold within the matrix of sulphide minerals, …
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ultra fine grinding refractory gold. Ultra Fine Grinding A Practical Alternative to Oxidative Treatment of Refractory Gold Ores S Ellis Kalgoorlie Consolidated Gold Mines Kalgoorlie WA Abstract Since early 2001 Kalgoorlie Consolidated Gold Mines KCGM has successfully operated an ultra fine grinding UFG circuit to supplement its roaster capacity for the
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At present, the main refractory gold processing methods include ultrafine grinding, pressure oxidation (POX), roasting, or bioleaching. Pressure oxidation, roasting and bioleaching have been successful in oxidising refractory sulphide minerals to expose gold in solid solution that cannot be recovered by ultra-fine grinding alone. GOLD EXTRACTION
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The application of ultra fine grinding to refractory gold ores or concentrates has proven to offer a viable alternative to conventional oxidative processes. Many gold plants have effectively used the stirred mills including IsaMill ® and SMD ® mills for ultra fine grinding,,, .
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Ultra Fine Milling For The Recovery Refractory Gold. 201987 a refractory gold ore is an ore that has ultra fine gold particles disseminated throughout its gold occluded minerals. these ores are naturally resistant to recovery by standard cyanidation and carbon adsorption processes. these refractory ores require pretreatment in order for cyanidation to be effective in recovery …
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Ultra Fine Grinding Refractory Gold. In February 2001, Kalgoorlie Consolidated Gold Mines KCGM commissioned its first full-scale ultrafine grinding UFG plant to supplement its existing roaster-concentrate treatment capacity. The process involves the fine grinding of refractory pyritic concentrate.
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Ultra fine milling for the recovery of refractory gold . Jan 01, 1991 Refractory gold ores may be defined as those which yield low recoveries of gold when treated by the conventional grinding and cyanidation process This refractory behaviour can vary from mild to severe with gold recoveries of 85% down to less than 30% [1] A common cause of refractoriness is …
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The particle size of this kind of gold ore is very small, so it is difficult to expose the gold particles by fine grinding or ultra-fine grinding. This kind of gold ore is usually directly cyanidated by conventional cyanidation, and the extraction rate is less than 40%.
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ultra fine grinding refractory gold. There are forty years of manufacturing history, with three major production bases,over 160 senior R&D engineers and 600+ large and medium-sized digital processing equipment, The first-line technicians and professional after-sales service personnel up to 2,300+ and 200+ respectively.Introducing advanced technology and craftsmanship, …
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Ultra Fine Grinding Centrifugal Gold Rock Ore Gravity. Dec 24 2018018332But the ore is double refractory meaning the gold is locked within the pyrite and contains a lot of carbon Breaking the gold free requires both physical ultra fine grinding autoclaves and chemical processes that are energy intensive and costly In contrast the simplest most inexpensive method is gravity recovery
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The current high gold price is increasing the focus on the development of refractory gold ores and concentrates. Outotec can deliver the three main oxidative processes for the treatment of refractory gold concentrates – BIOX, pressure oxidation, and roasting – and also supply equipment for ultra-fine grinding as a fourth, non-oxidative treatment option.
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This laboratory work presents a study of the effect of ultrafine grinding on the gold recovery of a highly refractory gold concentrate. The particle size of the concentrate was P 80 = 46 µm and the main species present were quartz (28.58%), dolomite (25.63%), pyrite (20.93%), arsenopyrite (15.39%) and 112 g/t gold.
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Ultra Fine Grinding Often when gold is locked in sulphides and silicates it is necessary to reduce the particle size to a size where gold is liberated or partially liberated. For refractory ores this generally translates into grinding below 10 microns and often to as low as 3-4 microns.
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Ultra fine milling for the recovery of refractory gold I.J.Corrans J.E.Angove https://doi/10.1016/0892-6875 (91)90064-3 Get rights and content Abstract Refractory gold ores may be defined as those which yield low recoveries of gold when treated by the conventional grinding and cyanidation process.
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Ultra fine grinding of refractory gold ores/concentrates as a pre treatment method has been extensively tested 15 However only few studies 16 reported UFG of silver ores to improve silver . Get Price; Recovery of gold from sulfide refractory gold ore .
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Ultra Fine Milling For The Recovery Refractory Gold. FOB Reference Price:Get Latest Price Ultra fine milling for the recovery of refractory gold ScienceDirect. Refractory gold ores may be defined as those which yield low recoveries of gold when treated by the conventional grinding and cyanidation process.
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Refractory Ore Pretreatment Processes. A "fine" grind in a gold production plant might produce a particle size distribution in which 80% of the ore is finer than 44 µm. Ultra-fine grinding can be defined as a process that produces an 80% passing size of 20 µm or less.
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