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preg robbing gold in autoclave oxidation

A double refractory gold ore contains gold particles locked in sulphides, solidsolution in arsenopyrite, and pregrobbing material such as carbonaceous matter, and so on the diagnostic leach test dlt and pregrobbing pr approaches are widely used to investigate the occurrence and the distribution of refractory gold dlt serves to qualitatively evaluate the gold occurrences within the ore

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  • Pressure Oxidation   Caldera Engineering

    Pressure Oxidation Caldera Engineering

    Pressure oxidation pox is a process used to extract gold, copper, zinc, molybdenum, and uranium from refractory ore bodies the pox process utilizes elevated temperatures roughly degrees celsius, elevated pressures roughly bar or psi, and oxygen to

  • PRESSURE OXIDATION OF PYRITE ARSENOPYRITE

    PRESSURE OXIDATION OF PYRITE ARSENOPYRITE

    Pressure oxidation of pyritearsenopyrite refractory gold concentrate autoclave oxidation tests were conducted in bchi ecoclave model titanium autoclave the total volume of the autoclave vessel was about dm and it was equipped with magnetic agitation unit, gas inlet and outlet, and sampling system with

  • Cyanidation of a pyrrhotite bearing gold ore

    Cyanidation of a pyrrhotite bearing gold ore

    Pregrobbing is the removal of dissolved gold by a solid an xps and sem study characterized the form of gold on sulphide minerals jean and bancroft, a comprehensive study of the pregrobbing property of minerals, using mssbauer spectroscopy indicated that gold cyanide is reduced on the surface of sulphide minerals adams et al,

  • US8262768B2   Method to improve recovery of gold from

    US8262768B2 Method to improve recovery of gold from

    The present invention is directed to a precious metal recovery process in which carbonaceous material, such as preg robbing carbon, is floated after sulfide oxidation to separate the carbonaceous material from the precious metal

  • link springer com

    link springer com

    The suggested concept was used to diminish the loss of gold via partial oxidation of metallic gold in autoclave processing of pyrite and arsenopyritecontaining concentrates possibility of using strongly basic anion exchange resin of minix brand and weakly basic anion exchange resin purogold s brand in the hightemperature

  • Improving Gold Recovery from Artificial Preg Robbing

    Improving Gold Recovery from Artificial Preg Robbing

    Carbonaceous materials in rob o for highre preglevel of pregrob ores, special treatments such as roasting, chlorination, nitric acid wash, biooxidation and pressure oxidation are required pretreatment of pregrobbing gold ore can also be performed by using

  • A Study of the Modes of Gold Loss in the Calcium

    A Study of the Modes of Gold Loss in the Calcium

    The evermore increasing complexity of gold ores is forcing operations to seek alternative gold leaching reagents to the traditional use of cyanidation at the barrick goldstrike mine, the implementation of a nontoxic thiosulfate leaching process is about to become an industrial reality with modification to the existing infrastructure and leaching circuit, this new process allows for the

  • autoclave pressure oxidation gold au grinding mill china

    autoclave pressure oxidation gold au grinding mill china

    Kolkata autoclave pressure oxidation gold au high frequency screen compared with the commonly screening and grading equipments, the high frequency screen adopts higher frequency mgp au produced ozs cells, fine grinding with isa mill and preg robbing management pressure oxidation autoclave bar and get price

  • PREG ROBBING OF GOLD IN CHLORIDE BROMIDE

    PREG ROBBING OF GOLD IN CHLORIDE BROMIDE

    The tendency of pregrobbing was demonstrated by adding carbon in a nonpregrobbing ore it was shown that the pregrobbing tendency in the chloridebromide media was very strong addition of ww of carbon powder into the nonpregrobbing ore decreased gold recovery from to and addition ww of carbon decreased gold recovery to

  • Abstract  A Novel Electrochemical Approach to Study the

    Abstract A Novel Electrochemical Approach to Study the

    Pregrobbing usually refers to the adsorption of a gold cyanide complex, iE aucn , on the components of a gold ore including carbonaceous materials and other minerals during the gold leaching process The adsorption of gold ions on carbonaceous materials is one of the most common phenomenon responsible for gold losses from the cyanide leaching process ,

  • Minerals   Free Full Text   CIL Gold Loss Characterization

    Minerals Free Full Text CIL Gold Loss Characterization

    A double refractory gold ore contains gold particles locked in sulphides, solidsolution in arsenopyrite, and pregrobbing material such as carbonaceous matter, and so on the diagnostic leach test dlt and pregrobbing pr approaches are widely used to investigate the occurrence and the distribution of refractory gold dlt serves to qualitatively evaluate the gold occurrences within the ore

  • Microbial oxidation of gold ores and gold bioleaching

    Microbial oxidation of gold ores and gold bioleaching

    Much recent work in the field of biohydrometallurgy has been directed to the study of biooxidation of gold ores by acidophilic iron and sulfur oxidizing microorganisms this work has been done worldwide and has resulted in several pilot plant and commercial scale operations for gold ore biooxidation

  • Pressure oxidation   Wikipedia

    Pressure oxidation Wikipedia

    Pressure oxidation is a process for extracting gold from refractory ore the most common refractory ores are pyrite and arsenopyrite, which are sulfide ores that trap the gold within themRefractory ores require pretreatment 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

  • Chloride as an Alternative to Cyanide   SGS

    Chloride as an Alternative to Cyanide SGS

    Application of the process to pregrobbing gold ores, and to silver ores, is also briefly discussed methods of recovering the gold from the platsol liquors are examined development of the platsol process fundamentals pressure oxidation has been used commercially since to pretreat refractory gold ores prior to cyanidation

  • Recovery Refractory Resources   SGS

    Recovery Refractory Resources SGS

    Are driven by the gold recovery rate the pretreatment of refractory gold ore should increase the gold recovery rate in the cyanide leach process by in order to be economical large operations tend to choose roasting or pressure oxidation, while smaller operations tend to select bacterial leaching, says dr fleming other

  • Mining  Processing and Environment at Macraes   SpringerLink

    Mining Processing and Environment at Macraes SpringerLink

    Aug , ore consisting of graphitic sheared schist is pregrobbing, and gold recovery was also low introduction of pressure oxidation processing before cyanidation has increased gold recovery pressure oxidation residues include ferric iron oxyhydroxide, jarosite, and iron arsenate, and associated waters have very high dissolved as dissolved as

  • Determining Gold Balance In Refractory Gold Ores

    Determining Gold Balance In Refractory Gold Ores

    Trace amounts of gold with a mixture of illitesmectite clay, montmorillonite and free carbon were observed by laser ablation inductively coupled plasma mass spectrometry, indicating potential for pregrobbing by clays and carbon pregrobbing is a process that prevents some of the gold from being recovered, making extraction less effective

  • TECHNOLOGY FOR PROCESSING OF REFRACTORY GOLD

    TECHNOLOGY FOR PROCESSING OF REFRACTORY GOLD

    Autoclave oxidation albion autoclave oxidation conditions c, o addition at bar, oxidation for h ials n oxidation time, h piryte oxidation degree arsenopyrite oxidation level au recovery by cyanidation

  • Valves for gold autoclave pressure oxidation  POX    Neles

    Valves for gold autoclave pressure oxidation POX Neles

    Autoclave pressure oxidation pox is an effective pretreatment option when extracting gold from refractory ore bodies, such as pyrite and arsenopyrite while gold processing plants are the most common utilizers of pox technology, the process can also be

  • US5536297A   Gold recovery from refractory carbonaceous

    US5536297A Gold recovery from refractory carbonaceous

    A process for recovering gold in which an ore slurry of refractory sulfidic and refractory carbonaceous ore having pregrobbing characteristics due to the presence of organic carbon is subjected to pressure oxidation in an autoclave the oxidized ore slurry is mixed with a thiosulfate salt lixiviant, which mixture is maintained at a ph between and while the slurry is agitated in a

  • Treating Carbonaceous Gold Ores  amp  Chlorine Halogens by

    Treating Carbonaceous Gold Ores amp Chlorine Halogens by

    Autoclave pressure oxidation followed by carboninleach cil cyanidation was the process of choice, even though the twin creeks ores contain pregrobbing organic carbon laboratory tests showed that optimum operating conditions were as follows a fine grind size of passing to microns, a temperature of c, psig oxygen overpressure, and minutes of batch autoclave

  • CIL Gold Loss Characterization within Oxidized Leach

    CIL Gold Loss Characterization within Oxidized Leach

    Characterization, diagnostic leach tests, and pregrobbing tests material and methods mineralogical characterization, dlt, and adsorption tests were performed to study the gold distribution and pregrobbing, using four samples taken from the mill carbon in leach cil tailings at the kittil mine in finland oxidized tailings

  • deportment of gold in an autoclave pressure oxidation ac

    deportment of gold in an autoclave pressure oxidation ac

    Apr , deportment of gold in an autoclave pressure oxidation acpox the gold recovery is low and a gold deportment study of the cil residue was the need for optimization of the oxidation process in the autoclave facility more detailed get price september

  • Pressure oxidation of double refractory raw materials in

    Pressure oxidation of double refractory raw materials in

    Pressure oxidation allows to carry out the efficient processing of goldbearing sulfide materials however, application of this method for processing of double refractory raw materials leads to irreversible gold losses due to autoclave pregrobbing of gold by organic carbon thermodynamic and experimental data indicate that almost complete sulfide decomposition leads to a high value of

  • Gold Recovery And How To Choose The Right Process

    Gold Recovery And How To Choose The Right Process

    Carbon is a pregrobbing mineral and can be managed in a few different ways it can be burned off, treated with preflotation, or deactivated with other chemicals in recent years gravity concentration has been used as an effective treatment for dealing with carbonaceous ores for optimal gold recovery, it is vital to know the type of ore you

  • PREG ROBBING CARBONACEOUS MATTER  AN

    PREG ROBBING CARBONACEOUS MATTER AN

    Ways a pressure oxidation for sulphide oxidation and cm passivation recommended grain sizes should be smaller than microns and autoclave operated at the temperatures of c or greater the approach is primarily limited to processing double refractory ores with low pregrob capacity due to limited oxidation effect on cms simmons,

  • Polymetal to expand pressure oxidation gold treatment in

    Polymetal to expand pressure oxidation gold treatment in

    Polymetal to expand pressure oxidation gold treatment in russia adding that the new facility would use a titaniumlined steel autoclave operating at and a pressure of bar high carbon content drives high sorption activity pregrobbing and dictates the use of hightemperature pressure oxidation compared with

  • Autoclave Circuit  amp  Gold

    Autoclave Circuit amp Gold

    Slurry from the grinding circuit, at approximately solids and passing mm is pumped to three thickeners thickener underflow, at approximately ww solids, is pumped to a train of four acidulation tanks sulfuric acid is added to the slurry to destroy sufficient carbonate prior to entering the autoclave circuit process air is also injected into the acidulation tanks to aid

  • Pressure oxidation of double refractory raw materials in

    Pressure oxidation of double refractory raw materials in

    The previous research done by src hydrometallurgy showed that autoclave pregrobbing of gold could be significantly inhibited by the addition of mercuryii compounds to pox slurry

  • Gold extraction   Wikipedia

    Gold extraction Wikipedia

    If the gold can not be concentrated for smelting, then it is leached by an aqueous solution the cyanide process is the industry standard thiosulfate leaching has been proven to be effective on ores with high soluble copper values or ores which experience pregrobbing the absorption by carbonaceous components which preferentially absorbs gold and goldcyanide complexes

  • Adsorption of aurocyanide complexes onto

    Adsorption of aurocyanide complexes onto

    Test in the pregrobbing test, a percent pregrobbing value pr is obtained by measuring the change in solution of gold concentration after contacting a goldcyanide solution with a known mass of ore in batch for min , the ability of the pregrobwx bing test to predict the pregrobbing

  • Speciation and quantification of surface gold in

    Speciation and quantification of surface gold in

    Jan , gold recovery can be adversely affected by pregrobbing on inherent carbonaceous material during autoclave pressure oxidation of sulphide ores the time of flight tof sims tofsims technique has been applied for direct determination of gold species on individual carbonaceous particulates from ac pox stream samples