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pretreatment of refractory ores in gold leaching process congo

pretreatment of refractory ores in gold leaching process congo

A method is disclosed for leaching a gold ore which is refractory due to the presence of sulphide minerals of arsenic and antimony. The ground ore is leached with cyanide in a pipe reactor at a pressure of between 5 and 8 MPa. The terminal pH value of the pulp is controlled to be 10 or less than 10.

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  • US4559209A   Leaching refractory gold ores   Google Patents

    US4559209A Leaching refractory gold ores Google Patents

    A method is disclosed for leaching a gold ore which is refractory due to the presence of sulphide minerals of arsenic and antimony. The ground ore is leached with cyanide in a pipe reactor at a pressure of between 5 and 8 MPa. The terminal pH value of the pulp is controlled to be 10 or less than 10.

  • Pretreatment Process on Refractory Gold Ores with As

    Pretreatment Process on Refractory Gold Ores with As

    The problem of the refractory nature of gold bearing arsenide ores is described. The basic principle, characteristics and application of pretreatment technique of arsenicbearing gold ores are ...

  • Developments in the pretreatment of refractory gold

    Developments in the pretreatment of refractory gold

    submicroscopic gold inclusions within sulphide minerals such as arsenopyrite and pyrite. Such ores require a pretreatment process to alter or destroy the sulphide matrix and render the gold accessible to cyanide and oxygen Gudyanga et al., 1999. The gold in highsulphur and higharsenic refractory gold concentrate HGC is encapsulated

  • Pretreatment Of Refractory Ores Prior To Copper Leaching

    Pretreatment Of Refractory Ores Prior To Copper Leaching

    In this study, the extraction of gold from a copperbearing gold ore by ammoniacal cyanide leaching was studied. Furthermore, ammonia leaching as a pretreatment process ahead of cyanide leaching was also examined. Only 12 of gold was extracted by direct cyanide leaching of the ore. Pretreatment Process on Refractory Gold Ores with As

  •  PDF  Bacterial Leaching as a Pre treatment Step for Gold

    PDF Bacterial Leaching as a Pre treatment Step for Gold

    It is necessary to apply a pretreatment to obtain high gold recovery gt80 from such refractory ores by cyanide leaching. There have been many studies on the oxidation of refractory gold ores for ...

  • Gold recovery  Effect of ozonation on refractory gold

    Gold recovery Effect of ozonation on refractory gold

    leaching of refractory ores results in incomplete gold recoveries, as a solution, a pretreatment process should be implemented. Various pretreatment, methods includes roasting, bio oxidation, highpressure cyanide leaching and pressure oxidation. With the development of new ozone generators, that

  • acidic pretreatment of gold refractory ore processing   MC

    acidic pretreatment of gold refractory ore processing MC

    Acidic Pretreatment Of Gold Refractory Ore Processing. Mining Gold Iron Ore Gold Ore Extraction Equipment. For a refractory ore, pretreatment is required in order to expose the gold surface to the leach solution.An acidic hypochlorite solution can be added to the autoclave for pressure oxidation and extraction of the gold at the same time.It ...

  • Sleeping gold   FLSmidth

    Sleeping gold FLSmidth

    Breaking new ground. FLSmidth is pioneering a mechanochemical pretreatment process known as the Rapid Oxidative Leach ROL for refractory gold ores. Sally Rocks, senior RampD chemist believes her team has made an extraordinary breakthrough which will have a profound effect on the industry.

  • Pretreatment Of Refractory Ores Prior To Gold Leaching

    Pretreatment Of Refractory Ores Prior To Gold Leaching

    ECONOMICS OF REFRACTORY GOLD ORE PROCESSES. ECONOMICS OF REFRACTORY GOLD ORE PROCESSES John E. Litz and R. Wayne Carter 119th TMS Annual Meeting February 1822, 1990 Hazen Research, . Get Price 187 Chat Online Establishing thE ProcEss MinEralogy of gold orEs. 2004 Establishing thE ProcEss MinEralogy of gold orEs JoE Zhou, brucE Jago and chris Martin sgs

  • refractory ore gold and pretreatment e6

    refractory ore gold and pretreatment e6

    Pretreatment of Refractory Ores in Gold Leaching Process Pretreatment of Refractory Ores in Gold Leaching Process Congo XSM is a leading global manufacturer of crushing and milling equipment Pretreatment of Refractory Ores . Get Price

  • GOLD RECOVERY OF REFRACTORY SULFIDE

    GOLD RECOVERY OF REFRACTORY SULFIDE

    It needs oxidative pretreatment for cyanidation to be effective in gold recovery the objective of this study is figuring out the effect of sodium nitrite as an oxidizing reagent on cyanidation of refractory gold ore. Cyanide leaching of the concentrate was performed at 20ww of solid 500 gram of refractory sulfide gold ore concentrate in a ...

  • gold heap leaching process in congo drc

    gold heap leaching process in congo drc

    gold leaching tanks in south africa . gold leaching process in south africatailing leachand the Congo DRCafrica of ore to be fed leached on heap leach leaching plants for gold for sale get price

  • Gold Recovery 101   Sepro Mineral Systems

    Gold Recovery 101 Sepro Mineral Systems

    Refractory Gold Any ore that is not readily amenable to recovery by conventional cyanide leaching at a reasonable grind size can be considered refractory. The three primary factors that cause gold ores to be refractory are Physical encapsulation Extremely fine lt10 181m particles are locked within an impervious, unreactive mineral.

  • Process for treating refractory gold ores by roasting

    Process for treating refractory gold ores by roasting

    Microscopic gold inclusions in sulfide minerals cannot typically be extracted by conventional cyanidation. The gold ore must be pretreated to oxidize sulfide minerals associated with gold and to remove other minerals and chemical compounds that interfere in the cyanidation leaching process. The recovery of gold from refractory sulfidiccarbonaceous ores after roasting pretreatment was studied.

  • 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.

  • Developments in the pretreatment of refractory gold

    Developments in the pretreatment of refractory gold

    submicroscopic gold inclusions within sulphide minerals such as arsenopyrite and pyrite. Such ores require a pretreatment process to alter or destroy the sulphide matrix and render the gold accessible to cyanide and oxygen Gudyanga et al., 1999. The gold in highsulphur and higharsenic refractory gold concentrate HGC is encapsulated

  • Modern trends in gold processing     overview   ScienceDirect

    Modern trends in gold processing overview ScienceDirect

    In the extraction aspect, the paper discloses two different extraction schemes on treating refractory ores, namely pretreatment followed by gold leaching and direct leaching. Pretreatment process involving roasting chemical oxidation and biooxidation have been discussed. Direct leaching of gold ores such as heap leaching, carbon in pulp CIP ...

  • Leaching Guide of Refractory Gold Ore

    Leaching Guide of Refractory Gold Ore

    1.What Is Refractory Gold Ore With the development of beneficiation technology, the definition of refractory gold ore is changing. Generally speaking, refractory gold ore in leaching field is a kind of ore whose leaching rate of gold is less than 80 when directly processed by

  •  PDF  Bacterial Leaching as a Pre treatment Step for Gold

    PDF Bacterial Leaching as a Pre treatment Step for Gold

    It is necessary to apply a pretreatment to obtain high gold recovery gt80 from such refractory ores by cyanide leaching. There have been many studies on the oxidation of refractory gold ores for ...

  •    Maelgwyn Minerals    Leachox Refractory Gold Process hits

    Maelgwyn Minerals Leachox Refractory Gold Process hits

    Its now over 10 years since the European Patent Office advised its decision to grant Maelgwyn Mineral Services Ltd MMS a European Patent for its Leachox process for the treatment of refractory gold ores. Since that time the process route has become the industry leader in the lowcost recovery of gold from refractory and sulphide orebodies.

  • Pretreatment Of Refractory Ores Prior To Copper Leaching

    Pretreatment Of Refractory Ores Prior To Copper Leaching

    In this study, the extraction of gold from a copperbearing gold ore by ammoniacal cyanide leaching was studied. Furthermore, ammonia leaching as a pretreatment process ahead of cyanide leaching was also examined. Only 12 of gold was extracted by direct cyanide leaching of the ore. Pretreatment Process on Refractory Gold Ores with As

  • ECONOMICS OF REFRACTORY GOLD ORE PROCESSES

    ECONOMICS OF REFRACTORY GOLD ORE PROCESSES

    Refractory gold ore pretreatment processes continue to receive much attention. This paper compares the relative economics of treating ores by oxygen pressure oxidation, roasting and bacterial oxidation with or without preconcentration by froth flotation. Capital and operating cost estimates for each method of pretreatment were prepared and

  • ALTA Gold 2012 E Doc   Albion Process

    ALTA Gold 2012 E Doc Albion Process

    leaching circuits, even when the ore is finely ground. The cause of low gold recoveries can be either through the presence of naturally occurring preg robbing carbonaceous materials or gold physically locked in sulphide minerals. The majority of gold ores are classified refractory because the gold mineralogy is contained in sulphides.

  • gold heap leaching process in congo drc

    gold heap leaching process in congo drc

    gold leaching tanks in south africa . gold leaching process in south africatailing leachand the Congo DRCafrica of ore to be fed leached on heap leach leaching plants for gold for sale get price

  • Microwave pretreatment of a double refractory gold ore

    Microwave pretreatment of a double refractory gold ore

    Abstract Double refractory gold ores, such as Barricks Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching. One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic carbon. In this research, microwave roasting of a double refractory gold ore was investigated as an ...

  • process for the treatment of refractory gold concentrates

    process for the treatment of refractory gold concentrates

    for the pretreatment of refractory gold ores and concentrates and the leaching of wholeore copper heaps. In many cases, it offers economic, environmental and technical advantages over pressure oxidation and roasting1,2. However, in order for bioleaching to compete successfully with other pretreatment processes it needs to be optimized

  • Gold mineral processing   Hatch Ltd

    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 pretreatment processes include pressure oxidation, biological oxidation and various forms of ...

  • microwave pretreatment of a refractory gold   MC World

    microwave pretreatment of a refractory gold MC World

    pretreatment microwave pretreatment of a refractory gold. Microwave pretreatment of a double refractory gold . 2020720 Abstract Double refractory gold ores, such as Barricks Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching.

  • US4559209A   Leaching refractory gold ores   Google Patents

    US4559209A Leaching refractory gold ores Google Patents

    A method is disclosed for leaching a gold ore which is refractory due to the presence of sulphide minerals of arsenic and antimony. The ground ore is leached with cyanide in a pipe reactor at a pressure of between 5 and 8 MPa. The terminal pH value of the pulp is controlled to be 10 or less than 10.

  • Process for treating refractory gold ores by roasting

    Process for treating refractory gold ores by roasting

    Microscopic gold inclusions in sulfide minerals cannot typically be extracted by conventional cyanidation. The gold ore must be pretreated to oxidize sulfide minerals associated with gold and to remove other minerals and chemical compounds that interfere in the cyanidation leaching process. The recovery of gold from refractory sulfidiccarbonaceous ores after roasting pretreatment was studied.

  • Diagnostic Leaching For Refractory Gold Ores   SRK

    Diagnostic Leaching For Refractory Gold Ores SRK

    A 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 ...

  • pretreatment of refractory ores prior to gold leaching

    pretreatment of refractory ores prior to gold leaching

    Improved gold and silver extraction from a refractory ... To improve the their poor response to cyanide leach extraction of gold and silver from The refractoriness of gold ores arises refractory ores, pretreatment of the ing for the extraction of Ag.12,13 Celep principally from their inherent miner ore using a suitable method prior to et al.14,15 reported that pretreatment alogical properties.

  • Developments in the pretreatment of refractory gold

    Developments in the pretreatment of refractory gold

    submicroscopic gold inclusions within sulphide minerals such as arsenopyrite and pyrite. Such ores require a pretreatment process to alter or destroy the sulphide matrix and render the gold accessible to cyanide and oxygen Gudyanga et al., 1999. The gold in highsulphur and higharsenic refractory gold concentrate HGC is encapsulated