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(PDF) Gold recovery from a refractory pyrrhotite ore by

The gold content of the ore sample coming from Bolivia was of 10 g ty1 Au After 24 h leaching time by direct cyanidation low gold recovery was obtained Ž- 20% Au with a high reagent consumption On the other hand a high gold recovery was achieved for the biooxidated samples after 24 h cyanidation gold dissolution reached about 91% Au Get price

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The development of a jet reactor for the leaching of

refractory sulphides only renders about 60% of the refractory gold amenable to subsequent cyanidation Other techniques developed for the treatment of sulphidic refractory gold ores include pressure oxidation and bacterial oxidation Throughout the 1970s and 1980s Gencor (South Africa) worked on the development of bacterial oxidation for Get price

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russia high pressure oxidation gold

HIGH TEMPERATURE OXIDATION OF METALS AND ALLOYS 329 layers of the base metal oxide (Figure 6) The metal surface remains bright and clean while oxidation is occurring in fact within the base metal The border of the Internal Oxidation Zone (IOZ) presents the reaction (oxidation) front Get price

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Developments in the pretreatment of refractory gold

The high-pressure process utilizes nitric acid at a temperature of approximately 120–200C an oxidizing time of 2–60 minutes a concentration of 1–3N nitro- sulphuric acid (0 5–3N HNO 3) and a liquid to solid ratio of 6 1 to oxidize sulphide minerals releasing gold for recovery by conventional methods Get price

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Online optimization of a low pressure high

Mar 01 2006Newmont Mining Corporation has successfully applied online optimization to the low pressure high temperature fluidized bed oxidation refractory ore roaster at their Carlin Property in Nevada USA This project has yielded significant benefits including increasing gold recovery by two percentage points (2%) for refractory ore treated in this plant Get price

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Pressure Oxidation Plants For Gold Mining

The alkaline pressure oxidation of sulfidic gold ores is advantageous due to its relatively mild operating conditions of 100 C and 40 psig oxygen pressure This translates to simpler and possibly cheaper materials of construction for the autoclave compared to acidic pressure oxidation systems Get price

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Maelgwyn Minerals' Leachox Refractory Gold Process hits

To compare process routes and recoveries pressure oxidation can completely breakdown the sulphides and then achieve high gold recoveries maybe greater than 95% Where as with the Leachox process and the partial oxidation depending on the nature of the mineralogy recoveries in the range 80% to Get price

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High Pressure Acid Leach Pressure Oxidation

High Pressure Acid Leach (HPAL) HPAL testwork most often comprises initial batch leach tests in bench scale autoclaves to evaluate and optimise the various conditions necessary for pilot scale HPAL campaigns leading to the design construction and commissioning of full scale process plants Get price

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Pressure oxidation

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 them Refractory ores require pre-treatment before the gold can be adequately extracted Get price

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Effect of Chloride Concentration on Gold Recovery in

Pressure Oxidation Process • Oxidation of sulfides such as pyrite (FeS 2) and marcasite (FeS 2) at high T and P in autoclaves • Release of encapsulated gold grains Yes Pressure Oxidation Refractory? No Gold Ores Cyanidation Carbon Adsorption Reduction • Pre-treatment of "refractory" gold ores for cyanidation to be effectiveGet price

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US4919715A

Autoclaving is defined within the industry as a process involving high pressure oxidation of ore in slurry form Such a procedure is one alternative to chlorination in gold extraction technology An oxygen-rich gas is typically used rather than air to increase the reaction rate Get price

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high pressure oxidation of refractory gold minerals

russia high pressure-oxidation gold - BINQ Mining High Pressure Oxidation Of Refractory Gold Minerals For Sale High pressure oxidation of refractory gold minerals used iron ore processing plant in DEVELOPMENTS IN THE PROCESSING OF REFRACTORY COMPLEX GOLD ORES INSOLUBLE OR SLOW LEACHING GOLD MINERALS Get price

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Gold extraction

Pressure oxidation Albion process The refractory ore treatment processes may be preceded by concentration (usually sulfide flotation) Roasting is used to oxidize both the sulfur and organic carbon at high temperatures using air and/or oxygen Bio-oxidation involves the use of bacteria that promote oxidation reactions in an aqueous environment Get price

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Improved gold and silver extraction from a refractory

While high gold recoveries (N90%) from free milling beneficial effect of the temperature on the dissolution of stibnite with ores can be readily achieved refractory gold ores are often this system characterized by the low gold extractions (b80%) by conventional The decomposition of some arsenical and antimonial sulphides in cyanide leaching (Gupta and Mukherjee 1990) Get price

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New Technology for Recovery of Gold and Silver by Pressure

of pressure aqueous pre-oxidation of the sulphi de minerals Pressure oxidation has been the most popular method for the treatment of refractory gold concentrates (see Table 1) This process utilizes oxygen or air at high pressures and temperatures to oxidize an aqueousGet price

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OXIDATION OF REFRACTORY GOLD CONCENTRATES AND

gold The oxidation of refractory arsenical gold concentrates in aerated alkaline solutions results in the formation of thiosulfate arsenate and sulfate as well as the dissolution of gold copper and iron It appears that the dissolution of gold is due to the complex reactions of gold with thiosulfate ions promoted by the catalytic effect ofGet price

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US6395063B1

A system and method for recovering gold using pressure oxidation is disclosed In one embodiment a feed slurry is introduced into multiple compartments or stages of a multi-stage autoclave In another embodiment an agitator pump is disposed in each compartment or stage of an autoclave to draw the feed slurry and oxygen into a pump cavity for intimate mixing Get price

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pretreatment of refractory gold ore

Effect of Pretreatment of Sulfide Refractory Concentrate For extraction of gold from refractory ores or concentrate in which gold is surrounded or covered by iron sulfide minerals mainly arsenopyrite and pyrite mineral oxidative pretreatment is essential to oxidize sulfides and to expose gold Get price

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oxidation of refractory minerals

high pressure oxidation of refractory gold minerals high pressure oxidation of refractory gold minerals Feeding Conveying Vibrating feeder is the massive granular and powdery materials are sent to the subject feeding device from the storage warehouse or funnel in Read MoreGet price

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Oxidation of refractory gold concentrates and simultaneous

It involves the following aspects the chemistry of the oxidation of pure arsenopyrite and pyrite minerals in aerated alkaline solutions the kinetics of oxidation of arsenopyrite and the simultaneous dissolution of gold in such solutions the kinetics of simultaneous dissolution of gold during the alkaline oxidation of refractory gold concentrates the electrochemistry of gold in alkaline solutions containing thiosulfate or Get price

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Pressure oxidation

Pressure oxidation Pressure oxidation has a very high gold recovery rate normally at least 10% higher than roasting The oxidation of the iron sulfide minerals produces sulfuric acid soluble compounds such as ferric sulfate and solids such as iron sulfate or jarosite The iron-based solids produced pose an environmental challenge Get price

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Supercritical Water Treatment of Refractory Gold Ores

Supercritical water alters the structure of common sulfide minerals by partially removing sulfur from the mineral structure This discovery has been applied to the treatment of pyritic gold ores to improve precious metal recovery without generating or utilizing environmentally sensitive products such as SO2 chlorine or cyanide Get price

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high pressure oxidation of refractory gold minerals

high pressure oxidation refractory - high pressure oxidation of refractory gold minerals alta gold 2012 e doc albion process refractory gold ores are those that do not yield high gold recoveries in in biox and pressure oxidation all of the acid must be Get price

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Atmospheric alkaline pre

Residual cyanide levels in the leach remained positive and did not affect gold extractions Iron oxides such as hematite and magnetite and iron oxy-hydroxides such as goethite and ferrihydrite were observed in oxidized ore residues indicating a high level of iron and sulphur oxidation Get price

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Minerals Metallurgical Processing

Iron sulfide minerals break down completely during pressure oxidation and dissolve in the sulfuric acid solution that is generated from oxidation of the sulfides This dissolution liberates the tiny gold particles that were originally trapped in the sulfide crystals and gold recovery during subsequent cyanidation is usually very high (95%) Get price

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Application of eMAX analysis of pressure oxidation of

The nitric acid using processes (NITROX REDOX ARSENO) are among the new concepts as lower pressure alternatives for pretreatment of refractory gold ores High pressure oxidation of refractory ores and concentrates seems to be the preferred method of pretreatment today [6 7] Get price

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Autoclave and Pressure Oxidation

Autoclave and Pressure Oxidation Pressure oxidation was developed for processing refractory ores where gold is occluded in the sulfide minerals typically pyrite or arsenopyrite Oxidation of the sulfides at elevated temperatures and pressures liberates the gold allowing it to be economically recovered by conventional circuits Get price

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Mayskoye Gold Mine

The thickened filtered and packed flotation concentrate is transported to the port of Pevek via rail or road It is then shipped to the Amursk pressure oxidation (POX) facility for further processing or for export to clients It is the first Russian facility to use autoclave oxidation method for processing gold refractory ores Get price

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pressure oxidation refractory gold

PRESSURE OXIDATION OF REFRACTORY GOLD ORES THE Pressure oxidation is employed to liberate gold and silver in refractory sulfide concentrates often and ores The main pressure oxidation products from iron sulfide minerals are sulfuric acid (and metal Contact SupplierGet price

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Pressure Oxidation Plants For Gold Mining

Pressure oxidation was developed for processing refractory ores where gold is occluded in the sulfide minerals typically pyrite or arsenopyrite Oxidation of the sulfides at elevated temperatures and pressures liberates the gold allowing it to be economically recovered by conventional circuits Get price

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