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suphidic gold ore pretreatment

BACTERIAL LEACHING AS A PRE

BACTERIAL LEACHING AS A PRE-TREATMENT STEP FOR GOLD RECOVERY FROM REFRACTORY ORES In this article pre-treatment such as bio-leaching before cyanidation is discussed as an alternative technique to treat refractory gold ores containing pyrite and arsenopyrite There are

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The Oxidation Pretreatment of a Sulfidic Refractory Gold

An attempt has been made to study the pretreatment of sulfidic refractory gold ore with pyrolusite The influences of various parameters were studied to optimize the conditions The optimum leaching conditions were pyrolusite/gold ore mass ratio of 3 0 H2SO4 concentration of 3 0 M temperature of 100C particle size of 45μm stirring speed of 200 rpm

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Carbonaceous Gold Ore Treatment Method

Metallurgical ContentFlotationCyanide Leaching with Carbon or Resin in PulpRoastingChemical Oxidation Flotation The simplest method of treating a carbonaceous ore is the method described by R W Nice (1971) at the McIntyre Porcupine Mine where the carbon which contains very little gold is floated off and discarded The remaining ore is then responsive to cyanidation This does not work at

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CN102560138A

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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Minerals

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

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pretreatment of copper rich gold ore project

leaching of copper gold ore by ammoniacal cyanide leaching TREATMENT OF A COPPER RICH GOLD ORE BY AMMONIA When ammoniacal cyanide leaching system was used the extraction of gold was significantly improved to 90% Similarly the pretreatment of the ore by ammonia leaching was shown to lead to Contact Supplier

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Alkaline sulfide pretreatment of an antimonial refractory

Abstract This paper presents the alkaline sulfide pretreatment of an antimonial refractory gold and silver ore In the ore gold occurs mainly as gold-silver alloys and as associated with quartz and framboidal pyrite grains and to a small extent as the inclusions within antimonial sulfides

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Microwave pretreatment of a double refractory gold ore

With regards to the application of microwaves to refractory gold ores Haque 1987a Haque 1987b has studied the microwave pretreatment of refractory sulphidic ores and achieved gold extractions of over 98% However there is no information published on the microwave processing of the double refractory gold ores

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The Use of Oxygen in Gold Cyanidation Canadian

Jul 18 2013Three sulphidic gold ores containing various quantities of pyrite were tested with the Canadian Liquid Air oxygen uptake measurement method Oxygen demand of each gold ore is dependent on the pyrite content and its mineralogical origin

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Extraction of Gold Then Now and the Future

Extraction of Gold Then Now and the Future Prof Sehliselo Ndlovu DST/NRF SARChI Hydrometallurgy and Sustainable Development Summary of Oxidative Pretreatment Processes Process type Oxidative method State of development sulphidic ores gold preferably associated with arsenopyrite marcasite Fairview (RSA) Sao

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FLOTATION AND LEACHING AT ANGLO ASIAN MINING'S

Azerbaijan The ore body is a complex copper-gold porphyry deposit comprising intermixed oxidized transition and sulphidic gold and copper-bearing ores Gold in the sulphide ores is generally not refractory and is recoverable by cyanide leaching but the secondary copper minerals which are also cyanide soluble lead to high cyanide consumptions

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The Role of Sulfide Minerals and Carbon in The

A study was conducted to examine how pretreatment of carbon-bearing gold ores with chlorine enhances gold recovery by cyanidation It is hypothesized that metal species (including iron and copper) dissolved during chlorination adsorb on the carbon surface hindering the adsorption of dissolved gold To test the hypothesis samples of several sulfide minerals were subjected to

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Effect of Pretreatment on Leaching Primary Copper Sulfide

The pretreatment leaching process obtained 91 6% Au compared to 67 3% Au for leaching without pretreatment The bio-oxidation stage improves metal recovery Qiu et al [15] developed a cyanidation process with a pretreatment stage for silver and gold recovery from a refractory Au–Ag ore

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microwave pretreatment of a refractory gold

Microwave pretreatment of a double refractory gold ore With regards to the application of microwaves to refractory gold ores Haque 1987a Haque 1987b has studied the microwave pretreatment of refractory sulphidic ores and achieved gold extractions of over 98%

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INFLUENCE OF LEAD NITRATE ON CYANIDE LEACHING OF

increase in gold and silver recoveries between 0 4-1 2% for gold and 3 9-11 6% for silver at the end of 24 hours leaching by the addition of lead nitrate as 0 1-0 5 kg/Mg NaCN consumption decreased or did not change except for the Ovacik ore In the case of the Ovacik ore it slightly increased Keywords lead nitrate gold silver cyanide

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US5147617A

A process for recovering gold from gold-bearing ores includes the steps of forming a slurry of ground ore and treating the ore with an oxidizing and complexing agent such as hydrogen sulfide or a sulfide salt A chelating agent SO 2 air and an anion exchange resin are added to the slurry to subject the ore to a simultaneous sulfurous acid leaching and anion exchange resin adsorption step

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Mechanochemical pretreatment and thiosulphate leaching of

Mechanochemical pretreatment and thiosulphate leaching of silver from complex sulphide concentrate The refractory character of complex ores and concentrates is at present one of the main problems of their metallurgical processing The Peruvian complex sulphidic concentrate of provenience Casapalca is each from these rich deposits In

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pretreatment of copper rich gold ore project

leaching of copper gold ore by ammoniacal cyanide leaching TREATMENT OF A COPPER RICH GOLD ORE BY AMMONIA When ammoniacal cyanide leaching system was used the extraction of gold was significantly improved to 90% Similarly the pretreatment of the ore by ammonia leaching was shown to lead to Contact Supplier

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COMPARISON OF CYANIDE AND THIOSULPHATE

2 2 Classification of Gold Ores Oraby (2009) classifies gold ores in seven categories as presented below 1 Free milling ores from which cyanidation can extract 95% of the gold when the ore is ground to a size of 80% under 75 μm For example palaeoplacer and quartz vein gold are the two main classes of free milling ores 2

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Leaching of a gold bearing partially roasted sulphide

Leaching of a Gold Bearing Partially Roasted Sulphide Laboratory Scale Studies An usual approach for processing complex refractory gold ores is a pre-oxidation treatment prior the gold leaching step and C et al Comparative analysis of U S environmental control technologies for refractory gold pretreatment processes Industry and

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CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING OF

For extraction of gold from the refractory ores in which gold is surrounded by sul-fide minerals oxidative pretreatment of the ore is essential to oxidize the sulfides and expose gold Pyrometallurgical oxidation by roasting is encountered with environmen-tal limitations thus hydrometallurgical methods are preferred These methods include

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Flotation Characteristics of Kalgoorlie Super Pit

A fundamental study was carried out on super pit sulphidic gold ore to establish the most influential flotation characteristics which were subsequently used in the development of an optimum flowsheet to achieve best economical recovery of gold In developing the flowsheet consideration was given to existing operational constraints in the treatment of the Super Pit

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Fungal

novel and technically viable alternative methods for oxidative pretreatment of refractory gold ores Keywords Phanerochaete Chrysosporium Carbonaceous Matter Metal Sulphides Biotransformation 1 Introduction 1 1 Gold Ores and Refractoriness Gold ores can be classified broadly as non-refractory (alluvial and free-milling) and refractory

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Mineralogy and Pretreatment of a Refractory Gold Deposit

The grade and recovery of gold in the flotation concentrates were 49 44 g/t and 33 36% respectively The total recovery of gold was 90 94% The gravity–flotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of gold

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Improvement of Gold Leaching from a Refractory Gold

Gold Concentrate Calcine by Separate Pretreatment of Coarse and Fine Size Fractions Qian Li Yan Zhang * Xiaoliang Liu Bin Xu * Yongbin Yang and Tao Jiang the grinding of gold ore before flotation As a result for the calcine obtained after oxidative roasting from these refractory gold ores [5 6] The pretreatment of oxidative

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Studies On Bio

Although bacterial leaching of sulphidic minerals is a well-known phenomenon it is only in the last ten years that full-scale bacterial leaching plants have been commissioned for gold processing In order for bacterial leaching to compete successfully with other pretreatment processes for refractory ores particularly with established

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Method for pre

The disclosure relates to pre-treatment of precious metal-bearing oxide ores prior to precious metal leaching by thiosulfate The process comprises mixing oxide ore in oxygenated water in the presence of a carbon-based material (e g activated carbon or other type of carbon) The carbon-based material can be separated from the ore slurry and the gold is thereafter leached by a thiosulfate

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The sample of quartz sulphidic gold

Jul 16 2011Download royalty-free The sample of quartz sulphidic gold-bearing ore it is isolated on white background stock photo 6114629 from Depositphotos collection of millions of premium high-resolution stock photos vector images and illustrations

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Gold Extraction from a High Carbon Low

A high carbon low-grade gold ore in which gold mainly occurs in carbonaceous matters is a typical refractory gold ore whose conventional cyanide leaching extraction is only 12 9 % In this paper by the process of flotation-roasting-leaching gold was effectively enriched and extracted

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Gold Sulphide Ore Oxidation by Alkaline Pressure

The investigation of alkaline pressure pretreatment was continued by the Bureau for ores more typically found in the United states today This paper presents the results of an investigation to determine the viability of using a Na0H-O2 pretreatment for a sulfidic low grade gold ore from Nevada Experimental Procedures

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