pretreatment of refractory gold ore

  • The Use Of Microwave In Refractory Ore Benification

    The Use Of Microwave In Refractory Ore Benification. Microwave pretreatment of a double refractory gold ore . Sep 01 2007 Microwave pretreatment of a double refractory gold ore Microwave pretreatment of a double refractory gold ore Nanthakumar B. Pickles

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  • Gold extractionWikipedia

    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.

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  • High Pressure Oxidation Of Refractory Gold Minerals

    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.

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  • Pretreatment Of Refractory Ores In Gold Leaching Process Congo

    Pretreatment Process on Refractory Gold Ores with As449 Кб. KEY WORDS arsenic-bearing gold ore pretreatment process refractory gold ore.Statistics show that in the world about 2/3 gold resource belongs to the difficult processing ores and about 1/3 total output of world gold is produced from refractory gold.

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  • pretreatment of refractory ores in gold leaching process congo

    Processing technologies for gold-telluride ores SpringerLink. This study deals with provided that gold is coarse enough to the alkaline sulfide leaching as an Gold ores are commonly classi- be physically and economically liber- alternative pretreatment method fied as free-milling and refractory for antimonial refractory gold and ated. ores based on the metallurgical per- silver bearing ores.

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  • Refractory Gold Mining SGS

    Also grinding the ore to an extremely fine particle size can liberate gold encapulsated in sulfides. SGS 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

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  • Pretreatment Of Refractory Ores In Gold Leaching Process Congo

    Pretreatment Process on Refractory Gold Ores with As449 Кб. KEY WORDS arsenic-bearing gold ore pretreatment process refractory gold ore.Statistics show that in the world about 2/3 gold resource belongs to the difficult processing ores and about 1/3 total output of world gold is produced from refractory gold.

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  • Aeration pretreatment of low grade refractory gold ores

    Aeration curing over a long duration in wetted stockpiles shows promise as an affordable pretreatment method for oxidizing gold encapsulating sulfide minerals and possibly organic matter in low grade refractory ores. Following aeration pretreatment the ore is reclaimed neutralized and cyanide leached by conventional practices. Large tonnages of subeconomic material including mine

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  • Microbial Pretreatment of Refractory Gold OreXinhai

    Part of refractory gold ores of gold particles with fine gold or submicroscopic gold a parcel or disseminated exist in sulfide ore and the sulfide is usually pyrite arsenopyrite pyrrhotite even in some mineral deposits most of the gold can enter the crystal lattice of pyrite arsenopyrite in the state of super micro gold. Even if the ore

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  • Developments in the pretreatment of refractory gold

    Developments in the pretreatment of refractory gold minerals by nitric acid D.-X. LI College of Environmental Science and Engineering China The paper covers many literature reports of processes using nitrogenous species as an oxidant for processing refractory gold ores especially development in the pretreatment of refractory gold

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  • PAPER OPEN ACCESS Biooxidation pretreatment of low grade

    Hence this refractory gold ore in its processing requires pretreatment methods before cyanidation. Some conventional pretreatment methods such as the pre-aeration method by chlorination roasting pressure oxidation ultrafine grinding and flotation-intensive leaching . are . proven to be less suitable to process refractory-type gold ores

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  • GOLD RECOVERY OF REFRACTORY SULFIDE CONCENTRATES

    The problem of refractory sulfide gold ore that has a gold recovery less than 50 when direct cyanidation applied still exists until now. 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.

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  • pretreatment of refractory ores in gold leaching process congo

    Processing technologies for gold-telluride ores SpringerLink. This study deals with provided that gold is coarse enough to the alkaline sulfide leaching as an Gold ores are commonly classi- be physically and economically liber- alternative pretreatment method fied as free-milling and refractory for antimonial refractory gold and ated. ores based on the metallurgical per- silver bearing ores.

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  • refractory gold Indonesia

    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

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  • Microbial Pretreatment of Refractory Gold OreXinhai

    Part of refractory gold ores of gold particles with fine gold or submicroscopic gold a parcel or disseminated exist in sulfide ore and the sulfide is usually pyrite arsenopyrite pyrrhotite even in some mineral deposits most of the gold can enter the crystal lattice of pyrite arsenopyrite in the state of super micro gold. Even if the ore

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  • Gold extractionWikipedia

    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.

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  • Ozone Science Engineering Pretreatment with Ozone for

    sons that explain why ores can be refractory the most common being the occlusion of the submicroscopic gold within the sulfide minerals. In order to recover the pre-cious metals contained in refractory ores it is necessary to modify the matrix of the ore by an oxidative pretreatment to expose the metals to cyanide. The common alternatives

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  • Improvement of Gold Leaching from a Refractory Gold

    from these refractory gold ores 5 6 . The pretreatment of oxidative roasting has always been one of the most extensively used methods in China attributing to its mature technique high efficiency energy conservation etc. 7 8 Effective

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  • (PDF) Cyanidation of Refractory Gold Ores A Review

    In this paper the effect of the oxidative pretreatment and lead nitrate addition on the cyanidation of Zarshuran refractory gold ore containing 3.32 ppm Au 1.09 As and 0.5 sulfur were

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  • Microbial Pretreatment of Refractory Gold OreXinhai

    Part of refractory gold ores of gold particles with fine gold or submicroscopic gold a parcel or disseminated exist in sulfide ore and the sulfide is usually pyrite arsenopyrite pyrrhotite even in some mineral deposits most of the gold can enter the crystal lattice of pyrite arsenopyrite in the state of super micro gold. Even if the ore

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  • Ozone Science Engineering Pretreatment with Ozone for

    sons that explain why ores can be refractory the most common being the occlusion of the submicroscopic gold within the sulfide minerals. In order to recover the pre-cious metals contained in refractory ores it is necessary to modify the matrix of the ore by an oxidative pretreatment to expose the metals to cyanide. The common alternatives

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  • REFRACTORY GOLDPanTerra Gold Limited

    Refractory gold ores require either or both physical and chemical pre-treatment prior to cyanidation. The proportion of known refractory gold resources relative to overall gold resources is increasing year on year throughout the world. Albion Oxidation Process.

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  • Improvement of Gold Leaching from a Refractory Gold

    Refractory gold ores have increasingly been the main source of gold production with the exhaustion of amenable gold ores. Of the 2630 tons of total world gold production in 2011 about 25 was produced from refractory gold deposits and of the top 20 gold operations in 2011 eight were processing refractory ores monly relatively high content of detrimental impurities like S (sulfur) As

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  • Mineralogy and Pretreatment of a Refractory Gold Deposit

    The gravity–flotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of gold. The technological mineralogy of a gold deposit located in North-Western province of Zambia was carried out by using X-ray fluorescence spectroscopy (XRF) X-ray diffraction

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  • Application Note Refractory Gold PretreatmentpH

    Refractory Gold PretreatmentpH Mining Gold Processing Refractory gold ores are defi ned as containing minerals or carbon compounds that trap encapsulated gold and make leaching extraction diffi cult. These types of ores require pretreatment prior to cyanidation. Options for pretreatment include the following processes • Roasting

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  • (PDF) Cyanidation of Refractory Gold Ores A Review

    In this paper the effect of the oxidative pretreatment and lead nitrate addition on the cyanidation of Zarshuran refractory gold ore containing 3.32 ppm Au 1.09 As and 0.5 sulfur were

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  • Improvement of Gold Leaching from a Refractory Gold

    Refractory gold ores have increasingly been the main source of gold production with the exhaustion of amenable gold ores. Of the 2630 tons of total world gold production in 2011 about 25 was produced from refractory gold deposits and of the top 20 gold operations in 2011 eight were processing refractory ores monly relatively high content of detrimental impurities like S (sulfur) As

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  • Refractory Gold Ore Treatment Methods

    At the plant of the Consolidated Murchison Co. in the Transvaal South Africa where a refractory high-antimony gold ore is being treated flotation and cyanidation of the flotation concentrates and tailings are being practiced. The association of the antimony and gold is very intimate and during 1946 while the antimony recovery amounted to

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  • pretreatment of refractory gold orenasobchudek

    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

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  • Atmospheric alkaline pre-oxidation of refractory sulphide

    Four iron-sulphide-containing gold ores from the White Mountain mine in the Jilin Province China were studied to examine the benefits of using oxidative treatment prior to conventional cyanidation to leach gold. This pre-treatment consisted of bubbling air into an ore/water mixture for eight hours while adding enough caustic sodium hydroxide to maintain a pH of 11 throughout the test. Three

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  • Treatment of Refractory Gold OresXPS

    Treatment of Refractory Gold Ores Extractive Metallurgy Once the cause has been identified there are a number of alternatives for treating the ore. Firstly the gold can be made more amenable to cyanidation by ultra-fine milling followed by a hot atmospheric leach –the Albion Process.

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  • Microwave pretreatment of a double refractory gold ore

    Abstract Double refractory gold ores such as Barrick s 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

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  • WOA3Microbial pre-treatment of double

    The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media. The fungal agent is inoculated in the feed material to either decompose sulfide sulfur or deactivate preg robbing carbon The culture media is applied m the absence of a microbe to decompose some sulfide sulfur and release a portion of the gold.

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  • refractory ore gold and pretreatment

    Before leaching the gold ore must be crushed and grinded into small particles usually particle size varies between 30 and 180 μm. Free milling ores are ready for leaching after crushing and grinding whereas refractory ores need pretreatment. It is important to pretreat a refractory ore before leaching to achieve better gold extraction.

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  • Supercritical Water Treatment of Refractory Gold Ores

    The data show that supercritical water pretreatment made the refractory pyritic ore amenable to high gold recovery using standard leaching methods. Leaching achieved 90 gold recovery after a controlled-oxygen pretreatment in supercritical water. In contrast leaching yielded only 9 gold recovery without the pretreatment.

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  • CNAPretreatment method of refractory gold ore

    The invention discloses a pretreatment method of refractory gold ore which is characterized by comprising the following steps of adopting a dry-wet two-level ball grinder activating and impregnation process carrying out first-level dry grinding by adopting a vibratory ball grinder and efficiently improving the mineral activity on the basis of energy conservation through adjusting the

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