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refractory gold ore definition

Gold extraction - Wikipedia 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 pre-treatment in order for cyanidation to be effective in recovery of the gold. A refractory ore generally contains sulfide minerals, organic carbon, or both.

Refractory ore | chemistry | Britannica In gold processing: Extraction from refractory ores Many gold-bearing ores and concentrates are not readily amenable to cyanidation, owing to the presence of substances that consume the cyanide reagent before it can dissolve the gold, preferentially adsorb the gold as it dissolves (a phenomenon called preg-robbing), or completely surround the….

Refractory Gold Ore Treatment Methods Refractory Gold Ore Treatment Methods. Where gold is associated with arsenic, antimony, tellurium, and certain other minerals, it is often only partly soluble in cyanide solution. The difficulty is usually more of a physical than a chemical one but special methods of treatment may be required.

Processing of refractory gold ores - ScienceDirect In the simplest of terms these are refractory ore bodies. Reasons for ores being refractory will be highlighted. In addition to deposits that are totally refractory, another increasingly common occurence is where the surface ore body is well oxidized and non-refractory and frequently overlays large tonnages of non-oxidized refractory ore. K.S. Fraser, R.H. Walton, J.A. Wells 54 1991REFRACTORY GOLD - PanTerra Gold Limited By definition, refractory gold ores contain gold that is resistant to extraction by conventional chemical processing and as a result responds poorly to traditional gold cyanidation techniques such as Carbon-in-Leach (CIL), yielding less than 80% of the contained gold.

Refractory gold - BioMineWiki Refractory gold ore is generally defined as ore containing gold which cannot be satisfactorily recovered by conventional methods used to treat non-refractory gold ores, like gravity concentration or cyanidation.

Processing Refractory Gold - Hydrometallurgy: Leaching in ... Refractory ores are normally have either a high sulfide content that masks the gold preventing cyanide leaching of the gold, or high organic content that also block gold leaching (reabsorbs the gold), or it can have a high clay content that also soaks up the cyanide.

Treatment of Refractory Gold Ores | SpringerLink Abstract. Problem ores that yield low (say less than 80%) gold recovery by cyanidation when “normally ground” are defined as refractory.The term, as well as the technical methods used to treat such ores, are relatively new. J. C. Yannopoulos 8 1991Refractory Gold | Mining | SGS Mining Refractory Gold. Physical encapsulation of disseminated gold particles (usually less than a few micrometers in size) within a mineral that is unreactive and impervious to leaching Chemical interference by one or more of the ore constituents in the cyanide leaching process.

(PDF) Cyanidation of Refractory Gold Ores: A Review Cyanidation of Refractory Gold Ores: A Review. The insusceptibility of gold ores to conventional cyanidation is defined by its mineralogical information and exacerbated by the continuous decline in gold grade. The depletion of readily amenable gold ores and discovery of complex deposits inspire knowledge improvement and search...

Treatment of Refractory Gold Ores - XPS frequently pyrite. The second contributor to refractory behaviour is arsenic, which causes high refractoriness even at low concentrations. The presence of carbon in the ore is also a frequent cause of poor recovery, not because it makes the gold unresponsive to cyanidation but because it readily absorbs gold in solution and leads to “preg-robbing”.

Treatment of Refractory Gold Ores | SpringerLink Problem ores that yield low (say less than 80%) gold recovery by cyanidation when “normally ground” are defined as refractory. The term, as well as the technical methods used to treat such ores, are relatively new.

Pretreatment Process on Refractory Gold Ores with As Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding. 1) Arsenic-bearing refractory gold ore has stones extremely difficult to deal with. In the stones, gold is locked up in arsenic mineral matrix as the form of microscopic or submicroscopic lattice.

double refractory gold ores - keuken310.nl Refractory ores are normally have either a high sulfide content that masks the gold preventing cyanide leaching of the gold, or high organic content that also block gold leaching (reabsorbs the gold), or it can have a high clay content that also soaks up the cyanide.

PRESSURE OXIDATION OF REFRACTORY GOLD ORES: THE METATES GOLD ... The refractory nature of the concentrate requires a pressure oxidation (POX) step to oxidise the sulfide minerals and unlock the value metals. The oxidation of sulfides is a highly exothermic reaction.

ALTA Gold 2012 E-Doc Refractory gold ores are those that do not yield high gold recoveries in conventional cyanide- leaching circuits, even when the ore is finely ground. The cause of low gold recoveries can be either

Gold mineral processing - Hatch Ltd Refractory gold ore pretreatment Treatment of refractory gold ore (whole ore and flotation concentrates) has become more prominent since the 1980s, with many gold discoveries often including ores that are wholly or partially refractory. Refractory pre-treatment processes include pressure oxidation, biological oxidation and various forms of roasting.

The reasons of gold refractory, Gold ore classification, and ... Nov 28, 2016 · The reason of the gold mineral refractory There are so many types of reasons that caused the difficulty of gold ore processing, including physical element, chemical element, and mineralogical element.

(PDF) Heap biooxidation of refractory gold ores: Current ... A refractory gold ore heap is a shallow heterogeneous fixed-bed reactor stacked with pyritic and = or arsenopyritic ore and operated under unsaturated flow conditions.

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Gold Mining Process Development – Denver Mineral Engineers The common definition of “refractory” gold ores, are those ores that do not allow the recovery of gold by standard gravity concentration or direct cyanide leaching.

Diagnostic Leaching for Refractory Gold Ores Diagnostic Leaching for Refractory Gold Ores. Typically, a sample is ground and then subjected to gravity concentration with a centrifugal gravity concentrator, followed by hand-panning, or on a Mozley-type table. The concentrate is fire assayed for gold. The gravity tailing is subjected to cyanidation and the residue is assayed for gold.

Characterizing gold in refractory sulfide gold ores and ... Gold is present in refractory sulfide gold ores mainly in arsenian pyrite and arsenopyrite, where it occurs in both the chemically bonded state and as nano-size grains of metallic gold. During roasting or pressure oxidation, the sulfide matrix is destroyed and essentially all the gold is converted to the metallic form.

Gold extraction - QueensMineDesignWiki Refractory ores cannot attain sufficient extraction through conventional cyanidation techniques, and thus there are various alternative methods for extraction, depending on the refractoriness of the ore. Gold is locked into its host mineral due to any of the following factors from La Brooy et al. (1994).

Refractory Gold Ore Processing - OneMine Ores which have been refractory to treatment have been the bane of the Metallurgist's life ever since gold has been recognized as a metal valued for its indestructability, malleability and beauty. Webster's Dictionary defines "Refractory" as; "Resisting control or authority, stubborn, resistant to treatment or cure, unresponsive to stimuli, difficult to corrode or draw out," And gives as a synonym the word "unruly."

Gold, ore refractory NIST® SRM® 886 | Sigma-Aldrich Gold, ore refractory NIST® SRM® 886; find Sigma-Aldrich-NIST886 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich.

Review Pretreatment Process on Refractory Gold Ores with As KEY WORDS: arsenic-bearing gold ore; pretreatment process; refractory gold ore. 1. Introduction Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding.1) Arsenic-bearing refractory gold ore has stones extremely difficult to deal with. In the stones,

Ultra Fine Grinding - A Practical Alternative to Oxidative ... The refractory nature of gold ores is often associated with gold finely disseminated in sulphide minerals, such as pyrite, at conventional grind sizes. Conventional milling can liberate the pyrite from the gangue allowing a low mass pyritic concentrate to be produced by a process such as flotation.

Pressure oxidation - Wikipedia The most common refractory ores are pyrite and arsenopyrite, which are sulfide ores that trap the gold within them. Refractory ores require pre-treatment before the gold can be adequately extracted. The pressure oxidation process is used to prepare such ores for conventional gold extraction processes such as cyanidation. It is performed in an autoclave at high pressure and temperature, where high-purity oxygen mixes with a slurry of ore.

Evaluation of preg-robbing potential of refractory gold ores Academia.edu is a platform for academics to share research papers.

Refractory and Non-Refractory Ore - Gold Companies Explained Gold Companies Explained. Refractory and Non-Refractory Ore In general, refractory ore is one that is not amenable to gold extraction using cyanide. Refractory ore is undesirable because the methods needed to enable gold extraction are expensive. Non-refractory ore is where cyanide can be used to extract the gold.

gold refractory,ore classification,preprocessing methods The reasons of gold refractory, ore classification, and preprocessing methods. I.The reason of the gold mineral refractory. There are so many types of reasons that caused the difficulty of gold ore processing, including physical element, chemical element, and mineralogical element.

NIST - SRM Order Request System SRM 886 - Refractory Gold Ore 111.2(2) - Ores (powder form) Additional Information >> (Concentrations are in mass fractions, in %, unless noted by an asterik for mg/kg.) Parameter Value Sulfur 1.466 Gold 8.25*

Diagnostic Leaching for Refractory Gold Ores Diagnostic Leaching for Refractory Gold Ores. Typically, a sample is ground and then subjected to gravity concentration with a centrifugal gravity concentrator, followed by hand-panning, or on a Mozley-type table. The concentrate is fire assayed for gold. The gravity tailing is subjected to cyanidation and the residue is assayed for gold.

Gold extraction - QueensMineDesignWiki Refractory ores cannot attain sufficient extraction through conventional cyanidation techniques, and thus there are various alternative methods for extraction, depending on the refractoriness of the ore. Gold is locked into its host mineral due to any of the following factors from La Brooy et al. (1994).

Sulfides, Selenides and Tellurides: rebellious and refractory ... After calaverite, sylvanite is probably the next most important telluride ore mineral. It can assay as high as 30% gold. It is found with other telluride minerals in some precious metal ore deposits. Petzite: A gold and silver telluride that is mostly silver. Silver content is usually three times that of gold.

Biological Oxidation of refractory gold ore - YouTube Jun 06, 2015 · Here is a simplified presentation of how gold can be obtained from refractory gold ores using a combination of flotation and bacterial oxidation using thiobacillus ferroxidans. Collins Saguru 742US5236676A - Pressure chlorination of refractory gold ores ... A method and apparatus are described for recovering gold from aqueous slurries of refractory gold ores containing sulfidic and/or carbonaceous matter. The method entails pretreating an ore slurry with chlorine in a multi-compartment autoclave operated at an elevated pressure.

refractory mineral | Encyclopedia.com refractory mineral Mineral resistant to decomposition by heat, pressure, or chemical attack. Most commonly applied to heat resistance. Source for information on refractory mineral: A Dictionary of Earth Sciences dictionary.

Refractory | definition of refractory by Medical dictionary The coating is comprised of at least one electroplated layer and a color layer comprised of a refractory metal oxide or refractory metal alloy oxide wherein the oxygen content of the refractory metal oxide or refractory metal alloy oxide is a stoichiometric oxygen content layer on the color layer.

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