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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 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 hypochlorite-sodium-hydroxide solution followed of pressure cyanidation of the oxidized concentrate for the extraction of precious metals This process was conducted and evaluated under cyanide and oxygen

Sequential pretreatment of
double refractory gold ore

Double refractory gold ore was sequentially pretreated to oxidize sulfides by thermophilic archaeon Acidianus brierleyi and then to decompose carbonaceous matters using the cell-free spent medium (CFSM)from white-rot fungus Phanerochaete chrysosporium The pretreatment by A brierleyi significantly improved the gold recovery from 25% to 77% Metallurgical 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 gold is associated with arsenic antimony tellurium and

Improved gold and silver
extraction from a refractory

Hydrometallurgy 105 (2011) 234–239 Contents lists available at ScienceDirect Hydrometallurgy j o u r n a l h o m e p a g e w w w e l s ev i e r c o m / l o c a t e / h yd r o m e t Improved gold and silver extraction from a refractory antimony ore by pretreatment with alkaline sulphide leach Oktay Celep İbrahim Alp ⁎ Hacı Deveci Department of Mining Engineering Karadeniz Technical PRE-TREATMENT OF A REFRACTORY GOLD SULFIDE ORE BY MEANS OF ACIDITHIOBACILLI CELLS P CHIACCHIARINI † V de la FUENTE and E DONATI‡ †Facultad de Ingeniera Universidad Nacional del Comahue Buenos Aires 1400 8300 Neuqun Argentina patchiauncoma edu ar ‡Centro de Investigacin y Desarrollo de Fermentaciones Industriales (CINDEFI-CONICET)

Developments in the
pretreatment of refractory

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 goldGold 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 form of microscopic or submicroscopic lattice

biox process for gold crusher

process as a pretreatment procedure of refractory sulphide gold ores and concentrates Au and Ag recovery yields after cyanidation increased up to 78 % for Au and to 83 % for Ag Keywords BIOX Au Ag recovery gold oreCharacterization of refractory behaviour of complex gold/silver ore by of such an ore and for the identification of possible pretreatment options to overcome its refractoriness prior to cyanide leaching refractory gold ore containing 5 9% pyrrhotite 0 9% pyrite 1 3% arsenopyrite and a bulk flotation

Microwave pretreatment of a
double refractory gold ore

The effect of ultrasonic energy on the pretreatment and leaching of gold from the refractory ore was investigated Firstly the refractory ore was pretreated with sodium hydroxide under ultrasound mainly about the refractory gold leaching easily through arsenic removal to expose gold changing the composition physic-chemical and electro-chemical properties of the ore Currently there are four main methods of pretreatments of refractory gold ores with As Pretreatment options for deal-ing with refractory gold ores are illustrated in Fig

Pretreatment Of Refractory Gold Ore


Chloride–hypochlorite oxidation and leaching of refractory sulfide gold concentrate 65 Fig 3 Particles size analysis of gold concentrate Fig 4 XRD analysis of gold concentrate obtained by flotation Table 1 Major elements composition of the ore and floated concentrateThe present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media US20090158893A1 - Microbial pre-treatment of double refractory gold ores - Google Patents Microbial pre-treatment of double refractory gold ores Download PDF Info Publication number

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pretreatment of refractory ores in gold leaching process congo

Pretreatment Of Refractory Ores In Gold Leaching Process Congo BACTERIAL LEACHING AS A PRE-TREATMENT STEP FOR GOLD FOR GOLD RECOVERY FROM REFRACTORY ORES This leaching process decomposes the sulfide matrix thus exposing the encapsulated precious metals to leaching solution Refractory sulfide gold ores are characterized by yield poor gold recovery in direct conventional cyanide leaching That problem is an old and still existing problem until this time The refractory sulfide gold ores in which gold is surrounded by sulfide minerals oxidative pretreatment of the ore is important

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pretreatment of refractory ores prior to gold leaching

pretreatment of refractory ores prior to gold leaching Evaluation of Refractory Behaviour of Kaletaş (Turkey) Gold Ore approach Pretreatment of the ore via roasting and ultrafine grinding prior to cyanide leaching was also examined to enhance the gold recoveries No significantrefractory ores gain in importance Some 15-20% of current world gold production involves refractory ores that must be pre-treated prior to downstream recovery by cyanidation Ores are refractory for many reasons but commonly because gold occurs as tiny inclusions or submicroscopic gold within a sulphide mineral matrix This mineral matrix

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Pretreatment of a refractory arsenopyritic gold ore using

Mar 01 2015Read Pretreatment of a refractory arsenopyritic gold ore using hydroxyl ion Hydrometallurgy on DeepDyve the largest online rental service for scholarly research with thousands of academic publications available at your fingertips Microwave pretreatment of a double refractory gold ore 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

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A two

carbonaceous matter (CM) the ore is said to be double refractory (Nyavor and Egiebor 1992) In such ores gold particles may sometimes be occluded or included in the sulfide minerals and pretreatment is necessary to decompose the mineral structure to liberate gold for It was also found that pretreatment only in highly alkaline media (pH 13) can be effective in gold recovery Gold and silver extractions during subsequent cyanidation were improved from 69 4 to 80 7% for gold and 44 4 to 88 9% for silver where the extraction yields of arsenic iron and zinc were 93 7 75 9 and 26 9% respectively

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Get details on patent AU1985047894 - ACID OXIDATION PRETREATMENT OF REFRACTORY GOLD ORE PRIOR TO CONVENTIONAL GOLD RECOVERY by Sherritt International Consultants Inc and more at IP in AustraliaA 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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Pretreatment Of Refractory Gold Ore

  1. Process for recovery of gold from gold ores using a

    Sep 15 1992Types of refractory gold ore deposits that do not yield their gold values to the modified system include some pyritic ores with encapsulated gold and ores containing coarse elemental gold particles best recovered by other means The sulfiding pretreatment can be performed in various ways

  2. Improved gold and silver extraction from a refractory

    Deveci Department of Mining Engineering Karadeniz Technical University 61080 Trabzon Turkey a r t i c l e i n f o a b s t r a c t The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching

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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

Gold extraction

Figure 5 - Refractory Ore Pretreatment Options In order to choose a pretreatment option for a refractory ore the main concern is attaining a solution which succeeds in preparing the ore for cyanidation whilst remaining economically feasible Mill Sizing The ore throughput rate of a mill is largely dependent on the mining production rate