Acidic Pretreatment Of Gold Refractory Ore Processing

Acidic Pretreatment Of Gold Refractory Ore Processing

Acidic Pretreatment Of Gold Refractory Ore Processing
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acidic pretreatment of gold refractory ore processing Developments in the pretreatment of refractory gold minerals DEVELOPMENTS IN THE PRETREATMENT OF REFRACTO

Acidic Pretreatment Of Gold Refractory Ore Processing

  • acidic pretreatment of gold refractory ore processing

    Developments in the pretreatment of refractory gold minerals DEVELOPMENTS IN THE PRETREATMENT OF REFRACTORY GOLD MINERALS BY NITRIC ACID 145 processing refractory gold ores, include the high refractory gold ore, Gold, vol 31, no 1Gold 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 latticePretreatment Process on Refractory Gold Ores with Asmainly about the refractory gold leaching easily through arsenic removal to expose gold, changing the composition, physicchemical and electrochemical properties of the ore Currently, there are four main methods of pretreatments of refractory gold ores with As Pretreatment options for dealing with refractory gold ores are illustrated in FigReview Pretreatment Process on Refractory Gold Ores

  • Processing of refractory gold ores ScienceDirect

    The number of projects that are using refractory ore processing techniques has grown rapidly in recent years, examples of which are shown in Table 1 TABLE 1 Pressure Oxidation (acidic) Refractory ore processing projects Processing Rate Pro~ect Country (approx) Goldstrike USA 1500 t/d ore McLaughlin USA 3000 t/d ore Getchell USA 3000 t/d ore1 Introduction 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 latticePretreatment Process on Refractory Gold Ores with AsCelep et al, 2011a, Celep et al, 2011b and Alp et al (2014) increased silver and gold extraction, in a subsequent cyanidation from a refractory antimony ore, using an alkaline pretreatment with Na 2 S and NaOH (2011a), NaOH (2011b) and KOH (2014), achieving up to 94% silver extraction and 87% of the gold with 86% antimony removal for the KOHPretreatment of a refractory arsenopyritic gold ore

  • Processing of refractory gold ores ScienceDirect

    The best choice of a processing route to treat a refractory ore will in most cases be site specific, due mainly to the metallurgical and mineralogical characteristics of the ore The successful application of these processing techniques can result in mining operations that would otherwise have been impossibleMetallurgical 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 goldRefractory Gold Ore Treatment MethodsThe grade and recovery of gold in the flotation concentrates were 4944 g/t and 3336%, respectively The total recovery of gold was 9094% The gravity–flotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of goldMineralogy and Pretreatment of a Refractory Gold

  • Characterization of refractory behaviour of complex

    ADAMS M D Advances in gold ore processing, developments in mineral processing [M] Amsterdam: Elsevier, 2005 UBALDINI S, MASSIDDA R, ABBRUZZESE C Factorial experiments in the study of a biooxidative pretreatment for a conventional cyanidation of a Turkey arsenical gold ore [C]// Proceedings of the 5th Int Mineral Processing SymposiumDevelopments in the pretreatment of refractory gold minerals DEVELOPMENTS IN THE PRETREATMENT OF REFRACTORY GOLD MINERALS BY NITRIC ACID 145 processing refractory gold ores, include the high refractory gold ore, Gold, vol 31, no 1acidic pretreatment of gold refractory ore processingacidic pretreatment of gold refractory ore processing evaluating process options for treating some acidic pretreatment of gold refractory ore processing, Refractory gold ores are those that do not yield high gold recoveries in different methods of pretreatment were prepared and these estimated costs and ore sulfide that acid consumptionpretreatment of refractory ores prior to gold leaching

  • Effect of Pretreatment of Sulfide Refractory Concentrate

    Many of the gold deposits contain finely disseminated gold in iron sulfide minerals such as pyrite and arsenopy rite Such deposits are called refractory gold ores due to the encapsulation of fine particles of gold in the ore host A clear boundary between refractory and nonrefractory ore in terms of gold recovery is not well defined, butgold recovery However, cyanidation after dissolving the ore sample in hydrochloric acid (HCl), sulfuric acid (H 2 SO 4), ferric chloride (FeCl 3) and nitric acid (HNO 3), respectively, increased the gold recovery to 981% This shows that the ore is a sulfide refractory gold ore (Saba et al, 2011)CHLORIDE HYPOCHLORITE OXIDATION AND LEACHINGpretreatment of refractory ores prior to gold leaching acidic pretreatment of gold refractory ore processing evaluating process options for treating some acidic pretreatment of gold refractory ore processing, Refractory gold ores are those that do not yield high gold recoveries in different methods of pretreatment were prepared and these estimated costs and ore sulfide that acidpretreatment of refractory ores in gold leaching

  • Processing technologies for goldtelluride ores

    The presence of gold telluride minerals may render an ore refractory, the extent of this depends on the telluride mineral present and the mineralogical association [3] Gold, silver, and gold/silvertelluride minerals in ores dissolve more slowly than native gold in cyanide solutions, which results in less efficient gold extraction [4]The fungus Phanerochaete chrysosporium has been proven to biotransform refractory gold ores, leading to increase in gold recovery This transformation has been attributed to enzymes secreted by the microbe This paper reports the findings of preliminary investigations aimed at assessing the use of hydrogen peroxide and cellfree extracts from the fungus, P chrysosporium, to effectPretreatment of Refractory Gold Ores Using CellFreeexhaustion of nonrefractory gold ores, refractory gold ores have become main materials of the gold industry, and nearly one third of gold comes from refractory gold ores all over the world [1] Carbonaceous refractory gold ores contain organic carbon and inorganic carbon from black (or carbonaceous) and sedimentary rock series [2]Research status of carbonaceous matter in carbonaceous

  • USA Recovery of gold from refractory

    A process for recovering gold from refractory auriferous ironcontaining sulphidic ore which comprises feeding ground ore as an aqueous slurry to an acidic pretreatment step The ground ore in the acidic pretreatment step is treated with aqueous sulphuric acid solution to decompose carbonate and acid consuming gangue compounds, and subjecting the treated slurry to a first liquidsolidsA total gold extraction of 702% could only be reached via direct cyanidation from a refractory As, S and Cbearing gold concentrate calcine, and the gold extraction varied noticeably with different size fractions The reasons for unsatisfactory gold extraction from the calcine were studied through analyses of chemical composition, chemical phase and SEMEDS of different sizes of particlesImprovement of Gold Leaching from a Refractory GoldDevelopments in the pretreatment of refractory gold minerals DEVELOPMENTS IN THE PRETREATMENT OF REFRACTORY GOLD MINERALS BY NITRIC ACID 145 processing refractory gold ores, include the high refractory gold ore, Gold, vol 31, no 1acidic pretreatment of gold refractory ore processing

  • Pretreatment of Refractory Gold Ores Using CellFree

    The fungus Phanerochaete chrysosporium has been proven to biotransform refractory gold ores, leading to increase in gold recovery This transformation has been attributed to enzymes secreted by the microbe This paper reports the findings of preliminary investigations aimed at assessing the use of hydrogen peroxide and cellfree extracts from the fungus, P chrysosporium, to effectMany of the gold deposits contain finely disseminated gold in iron sulfide minerals such as pyrite and arsenopy rite Such deposits are called refractory gold ores due to the encapsulation of fine particles of gold in the ore host A clear boundary between refractory and nonrefractory ore in terms of gold recovery is not well defined, butEffect of Pretreatment of Sulfide Refractory ConcentrateA comparative test is performed to evaluate the effect of increasing carbonate content on gold recovery from refractory sulfidic ores Sulfidic gold ore is blended to provide composite ore samples with carbonate contents of 085, 145, 24, 4, 525, 675 and 745 weight percent, with approximately constant gold content ranging from 0060 to 0Processing of acidconsuming mineral materials

  • Effect of Pretreatment of Sulfide Refractory

    The majority of the refractory gold and silver occurs in occlusion in sulphides, then precious metal dissolution is possible by first oxidizing auriferous sulfide concentrate using sodium hypochloritesodiumhydroxide solution followed of pressure cyanidation of the oxidized concentrate, for the extraction of precious metals This process was conducted and evaluated under cyanide and oxygenThe refractory ore treatment process is then followed by a conventional cyanidation step Refractory ore processing methods include: Bioleaching; Autoclaving (pressure oxidation) Roasting; Clorination; Preoxidation; Lime/caustic pretreatment; Today, cyanide leaching is the method of choice for the recovery of most of the world’s gold productionGold Mining Process Development – Denver MineralThe objective was to evaluate the amount of soluble copper in cyanide before and after acidic cleaning From a gold ore containing copper, the study selected four samples containing 022%, 055%, 100% and 136% of copper For direct cyanidation of the ore without pretreatment, copper extraction by cyanide complexing ranged from 8 to 83%Effectiveness acidic precleaning for coppergold ore

  • Processing technologies for goldtelluride ores

    The presence of gold telluride minerals may render an ore refractory, the extent of this depends on the telluride mineral present and the mineralogical association [3] Gold, silver, and gold/silvertelluride minerals in ores dissolve more slowly than native gold in cyanide solutions, which results in less efficient gold extraction [4]G Fangjun The role of metal–cyanide species in leaching gold Results of acidic pretreatment on the sample 1 G Liao 1992M sulfide and carbonaceous matter HCl 210 95 Type of detrimental minerals and their values caused to sophisL A N 2 V Advances in Gold Ore Processing carbonaJ F CelepRAS 1995 919–928 M HNO3 andCyanidation of gold ores cpdf Free Download PDFexhaustion of nonrefractory gold ores, refractory gold ores have become main materials of the gold industry, and nearly one third of gold comes from refractory gold ores all over the world [1] Carbonaceous refractory gold ores contain organic carbon and inorganic carbon from black (or carbonaceous) and sedimentary rock series [2]Research status of carbonaceous matter in carbonaceous