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gold ores refractory

gold ores refractory

gold ores refractory
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Refractory gold ores: Challenges and opportunities for a 23/03/2021· Refractory gold reserves, which require more sophisticated treatment methods in

gold ores refractory

  • Refractory gold ores: Challenges and opportunities for a

    23/03/2021· Refractory gold reserves, which require more sophisticated treatment methods in order to achieve oxideore recovery rates, correspond to 24 percent of current gold reserves and 22 percent of gold resources worldwide (Exhibit 1) Despite offering a higher grade, these ores can only be processed using specific pretreatment methods such as ultrafine grinding, bio oxidation, roasting, or pressureMetallurgical ContentGold Leaching & Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS)6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide, Sb2S2)Telluride Gold Ore ProcessingSolubility of TelluridesGold Extraction from Carbonaceous OreList Gold Refractory Process Methods Where gold is associated with arsenic, antimony, tellurium, andRefractory Gold Ore Treatment MethodsSGS has very extensive experience with all the unit operations involved in the processing of refractory gold ores, and in selecting the optimum flowsheet for a particular ore Our gold metallurgy expertise is second to none Chemical interference There are two important mechanisms by which gold recovery is limited through chemical interference The first happens when there are minerals in theRefractory Gold | SGS

  • Refractory gold BioMineWiki

    Refractory gold ore is generally defined as ore containing gold which cannot be satisfactorily recovered by conventional methods used to treat nonrefractory gold ores, like gravity concentration or cyanidation Cause The refractory nature of these ores can be attributed to the presence of substances that consume the cyanide reagent before it can dissolve the gold, preferentially adsorb theRefractory siliceous gold ore Submicron symbiosis of goldquartz or goldamorphous quartz Gold is surrounded in the form of very fine particle size, it is not conductive to use an economical method for gold’s recovery 6 Goldsilver ore like lead sulfide and sulfurarseniccopper types In these types of ore, silver is symbiosis with lead, antimony sulfide, and sulfurarseniccopper oregold refractory,ore classification,preprocessing methods28/11/2016· III Classification of refractory ores 1 Carbonaceous gold ore There is organic carbon which can do‘Rob gold’in gold and silver ore, and it causes that gold is adsorbed in the cyanideThe reasons of gold refractory, Gold ore classification

  • Processing of refractory gold ores ScienceDirect

    01/01/1991· Refractory gold ores which have sufficient sulphur to provide all necessary energy requirements for an autothermal process will typically vent excess steam to the atmosphere through a suitable gas scrubber Steps within the post oxidation treatment of autoclave discharge can vary with the ore type and sulphur, arsenic and iron levels in the ore or concentrate Washing of slurry prior toOther articles where Refractory ore is discussed: gold processing: Extraction from refractory ores: Many goldbearing 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 pregrobbing), or completely surround theRefractory ore | chemistry | BritannicaIn 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 Nonrefractory ore is where cyanide can be used to extract the gold This is desirable as it means the process will be cheaper Refractory and Nonrefractory are relative terms, and the degree to which any oreRefractory and NonRefractory Ore Gold Companies

  • The reasons of gold refractory, Gold ore classification

    28/11/2016· III Classification of refractory ores 1 Carbonaceous gold ore There is organic carbon which can do‘Rob gold’in gold and silver ore, and it causes that gold is adsorbed in the cyanideRefractory gold ore is generally defined as ore containing gold which cannot be satisfactorily recovered by conventional methods used to treat nonrefractory gold ores, like gravity concentration or cyanidation Cause The refractory nature of these ores can be attributed to the presence of substances that consume the cyanide reagent before it can dissolve the gold, preferentially adsorb theRefractory gold BioMineWikirefractory gold ore bearing high arsenic in Guizhou It used water chlorination to leach gold and gold leaching rate reached 9148%17) High cost of chlorides and serious corrosion of equipment are the key factors to restrict the application of wet chlorination 34 HNO3 Catalyzing Oxidation Decomposition Method Nitric acid is the most efficient oxidant for pyrite, arsenopyrite andReview Pretreatment Process on Refractory Gold Ores with As

  • 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) Arsenicbearing 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 If use conventional cyanidation gold extraction processRefractory gold ores—report on investigations into roasting of gold concentrates in the Edwards roaster of the Fairview and the New Consort reduction plants Nat Inst of Metallurgy, Report No 211, Johannesburg Google Scholar Norwood, A F B 1939 Roasting treatment of auriferous flotation concentrates Proceedings Austr IMM 116: 391–412 Google Scholar Osmanson, R D 1987Treatment of Refractory Gold Ores | SpringerLinktelluride gold ores are often somewhat refractory due to the presence of slowdissolving gold minerals such as aurostibite, maldonite and gold tellurides Carbonaceous ores: The gold is fine, and, usually, is predominantly associated with the sulfides (pyrite or arsenopyrite) that are present in carbonaceous ores Gold in these types of ores is usually recovered by preoxidation to dissolveEstablishing thE ProcEss MinEralogy of gold orEs

  • Refractory and NonRefractory Ore Gold Companies

    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 Nonrefractory ore is where cyanide can be used to extract the gold This is desirable as it means the process will be cheaper Refractory and Nonrefractory are relative terms, and the degree to which any oreRefractory ores One of the major challenges to economically recovering gold from many ore bodies is the presence of certain impurities, like sulphides, organic carbon or arsenic, which can make the ore resistant to normal processing techniques like cyanidation and carbon adsorption These socalled refractory ores require pretreatment toProcessing refractory ores gets easier with new equipmentRefractory behaviour in gold ores includes those ores in which the gold is less accessible physically, typically because the gold particles are extremely fine and locked inside a protective layer of material This type of ore is characterised typically by sulphidebased minerology (eg pyrite or arsenopyritebased ores) or by fine gold particles that are trapped inside a silicabased mineralPLASMA SMELTING OF UNCONVENTIONAL ORES AND MINE RESIDUES

  • Gold Ore Roasting Techniques

    Metallurgical ContentRecover Gold by Roasting Pyrite OreRoasting of flotation concentratesRoasting Arsenopyrite Ore for GoldRoasting and leaching a sulphide concentrateRoasting and Processing Sulphotelluride ore to recover goldFluoSolids Roasting SystemRoasting with a FluoSolids reactorWhy use Salts in the roasting processROASTING WITH SODA ASHGOLD LOSSES IN ROASTINGCalcination &refractory gold ore bearing high arsenic in Guizhou It used water chlorination to leach gold and gold leaching rate reached 9148%17) High cost of chlorides and serious corrosion of equipment are the key factors to restrict the application of wet chlorination 34 HNO3 Catalyzing Oxidation Decomposition Method Nitric acid is the most efficient oxidant for pyrite, arsenopyrite andReview Pretreatment Process on Refractory Gold Ores with AsMesothermal gold ores in the Archaean Yilgarn Craton of Western Australia are dominated by a pyrite ± arsenopyrite ± pyrrhotite sulphide assemblage Many of these ores are refractory to varying degrees and require treatment by roasting, bacterial oxidation or finer milling The most common sulphide ore types can be subdivided broadly into pyritic (pyrite±pyrrhotite) and arsenical typesRefractory gold ores in Archaean greenstones, Western

  • 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) Arsenicbearing 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 If use conventional cyanidation gold extraction processtelluride gold ores are often somewhat refractory due to the presence of slowdissolving gold minerals such as aurostibite, maldonite and gold tellurides Carbonaceous ores: The gold is fine, and, usually, is predominantly associated with the sulfides (pyrite or arsenopyrite) that are present in carbonaceous ores Gold in these types of ores is usually recovered by preoxidation to dissolveEstablishing thE ProcEss MinEralogy of gold orEsA diagnostic leach test can be very useful to qualitatively assess how gold occurs within the ore and the extent to which it may be refractory Several different permutations of diagnostic leach tests depend on specific objectives, but they generally involve the sequential leaching of a gold ore sample with progressively stronger reagents, producing a qualitative assessment of the goldDiagnostic Leaching For Refractory Gold Ores | SRK

  • (PDF) Application of Diagnostic Leaching Technique for

    However, refractory gold ores are often characterized by the low gold extractions (<5080%) in cyanide leaching The refractoriness of gold ores and concentrates stems primarily from the inherent mineralogical features with reference to the mode of presence and association of gold and carbonaceous matter present In practice, the refractoriness has been reported to be caused by followingThe challenge of attaining economic extraction of gold from refractory ores is one of the main challenges in the mining industry today, as less refractory ores become more depleted It is thus important to properly select an extraction method for refractory ores, based on mineralogy, precious metal grades, gold to sulphur ratios and hazardous impurities (Mark Aylemore, 2008) Refractory oresGold extraction QueensMineDesignWikiRefractory ores One of the major challenges to economically recovering gold from many ore bodies is the presence of certain impurities, like sulphides, organic carbon or arsenic, which can make the ore resistant to normal processing techniques like cyanidation and carbon adsorption These socalled refractory ores require pretreatment toProcessing refractory ores gets easier with new equipment

  • Mineralogy and Pretreatment of a Refractory Gold

    Goldbearing pyrite and arsenopyrite account for a considerable proportion of refractory goldbearing sulfide ores Gold can be recovered through bulk flotation or selective flotation processes according to the distribution of gold in pyrite and arsenopyrite [24,25]Carbonaceous gold ores represent a unique class of refractory ores Not only is gold sometimes found encapsulated in sulfide minerals in these ores, but these ores also contain carbonaceous matter that interferes with recovery by cyanidation Gold in carbonaceous ores, therefore, can be associated with sulfide minerals, carbonaceous matter, and/or siliceous minerals P Afenya, Treatment ofMethod for recovering gold and other precious metals