refractory gold ore
refractory gold ore

Processing of refractory gold ores

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Jan 01, 1991 0183 32 Refractory gold ores which have sufficient sulphur to provide all necessary energy requirements for an autothermal process will typically vent excess steam to the atmosphere through a suitable gas scrubber Steps within the post oxidation treatment of autoclave discharge can vary with the ore type and sulphur, arsenic and iron levels in the ore ....

PRESSURE OXIDATION OF REFRACTORY GOLD ORES THE ,

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Pressure oxidation is employed to liberate gold and silver in refractory sulfide concentrates often and or The main pressure oxidation products from iron sulfide minerals are sulfuric acid and metal sulfates and hematite Depending on the conditions within the autoclave, acid containing iron compounds can be formed...

Recovery Refractory Resources

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refractory gold ore is gold-containing ore that is resistant to recovery by direct cyanidation and carbon adsorption process More specifically, it is an ore that has a gold recovery rate of less than 80 when direct cyanidation is applied to it Dr Chris Fleming, senior metallurgical consultant at SGS Minerals, says In the...

Recovery of gold from refractory gold ores Effect of ,

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Apr 05, 2021 0183 32 The extraction of gold from refractory gold ores RGOs without side reactions is an extremely promising endeavor However, most RGOs contain large amounts of sulfide, such as pyrite Thus, investigation of the influence of sulfide on the gold leaching process is important to maximize the utilization of RGOs In this work, the effects of pyrite on the stability of the ,...

EVALUATING PROCESS OPTIONS FOR TREATING SOME REFRACTORY ORES

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A significant contemporary challenge for gold mining companies is to define economic process options for treating more complex ore bodies as the less refractory ores become depleted Demonstration of economic treatment options allows gold companies to maintain and increase their ore reserv The selection of options to treat a specific ore is significantly impacted by ,...

CYANIDE LEACHING BEHAVIOR OF AN ARSENIC RICH ,

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REFRACTORY GOLD ORE Büyüktanır, Karden MS, Department of Mining Engineering Supervisor Assoc Prof Dr N Emre Altun February 2017, 113 pages In this work, the possibility of gold extraction using cyanide leaching from a refractory type gold ore, particularly rich in arsenic minerals of realgar and orpiment, was assessed...

Improvement of Gold Leaching from a Refractory Gold ,

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Refractory gold ores have increasingly been the main source of gold production with the exhaustion of amenable gold or 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 1...

Process for treating refractory gold ores by roasting ,

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The results showed that the dust belonged to refractory gold ore category, and the detrimental effects of arsenic, carbon and iron on gold extraction ,...

Numerical modeling microwave roasting of refractory gold ore

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The mathematical model was applied to two types of refractory gold ores viz carbonaceous and sulfidic gold or The model was tested for three different power levels of 133, 298 and 531 kW/sqm The temperatures predicted by the model and the transient temperature plots which enable control of temperature are presented here...

Refractory ore trouble Russian gold miners

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Sep 28, 2016 0183 32 Refractory ore trouble Russian gold miners Nowhere is this problem of complex ore more prevalent than in Russia, where approximately 80 of gold reserves are refractory or partly so, according to figures from Petropavlovsk PLC As competitive and cutthroat as the junior gold mining sector is, there is a line most miners would never cross when ....

Simultaneous Removal of S and As from a Refractory Gold ,

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Apr 29, 2019 0183 32 Materials and Reagents The refractory gold ore was a concentrate with over 80 wt pct of the particles smaller than 74 μm in sizeAs shown in Table I, it contained Au 1805 g/tThe weight percentages of the impurities of concern are As 162 pct, S 2076 pct, C 695 pct and Sb 131 pct, respectively...

Evaluation of Refractory Behaviour of Kaletaş Turkey ,

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However, refractory gold ores are often characterized by the low gold extractions...

PDF Biooxidation of sulfidic refractory gold ores ,

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The typical gold recovery of the process is 90-95 , whereas it works at a variety scales from 30-1000t concentrate/day The process is modular making a later expansion of the plant possible It is also considered able to treat a variety of ore types through the lifetime of a project, from transition ores to fully refractory or...

Review Pretreatment Process on Refractory Gold Ores with As

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refractory gold ore8,9 Haque K E used microwave to dis-pose of arsenical pyrite and gold concentrate with pyrite, the gold leaching rate reached 98 10 Liu Quanjun etc made a test for a gold mine in Guizhou province The ore without ,...

Issues affecting heap biooxidation of low

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The majority of the ore is sulfidic-refractory consisting primarily of homogenously distributed extremely small gold particles, generally ranging in size from colloidal to approximately 50 197 , hosted primarily as a solid solution within the structural lattice of arsenian pyrite rims which surround some pre-ore pyrite crystals Arehart et al, 1993...

The Separation of Carbonaceous Matter from Refractory Gold ,

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Nov 01, 2021 0183 32 Refractory gold ore, which shows poor gold recovery by cyanidation, typically contains one or all of the following 1 carbonaceous matter C-matter , which causes preg-robbing 2 locked gold in sulfides/silicates, and 3 cyanide/oxygen consumable matter, such as copper or sulfidic material 1,2,3 The ore used in this study is typical refractory gold ,...

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The increase of the gold demand leads to searching for more developed gold resources 1 Most of the world gold 177 2/3 are obtained from the processing of non-refractory gold ores because the ore proves to be easier to process using conventional gravity or cyanidation concentration methods Generally....

Types of refractory gold deposits

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The so-called refractory gold ore refers to the ore and concentrate that can not obtain satisfactory leaching rate by direct extraction of gold by traditional cyanidation under normal grinding conditions It is also called refractory gold ore or refractory gold ore According to the different reasons for its difficulty, it can be divided into ....

refractive gold process

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Oct 29, 2020 0183 32 Diagnostic Leaching for Refractory Gold Or 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 ....

Leaching Guide of Refractory Gold Ore

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Feb 28, 2020 0183 32 1What 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 cyanidation after find grinding...

Gold Ore Roasting Techniques

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Jul 14, 2016 0183 32 Arsenic, alloyed with gold-silver alloys, aids rather than hinders dissolution of gold in cyanide solution, and such could be ruled out as a cause of refractory behavior of gold-bearing arsenical or The presence of particles of precious metal in cyanide solution residues remains unexplained Cyanidation and concentration of gold and silver ores...

Teranga to process Sabodala

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Jul 27, 2020 0183 32 For processing the deposits that contain refractory gold ore, a separate ROT plant with a nominal capacity of 12 Mt/y will be installed adjacent to the existing Sabodala plant, with processing expected to begin in 2023 The ROT design is based on the use of bacterial oxidation BIOX® technology to expose the gold that is occluded within ....

Refractory gold ores in Archaean greenstones,Western ,

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Pyritic ores are free-milling to mildly refractory, or rarely moderately refractory Pyrite in pyritic ores contains negligible to low levels of submicroscopic gold...

PDF Refractory gold

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Hydrometallurgy, 34 1994 383-395 383 Elsevier Science BV, A m s t e r d a m Refractory gold-bearing ores a review of treatment methods and recent advances in biotechnological techniques Nieves Iglesias and Francisco Carranza Chemical Engineering Department, Universityof Sevilla, 41012 Sevilla, Spain Received January 10, 1993 revised version ,...

Recovery Refractory Resources

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Gold Ores Where to farm in WoW...

Gold mineral processing

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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 ....

refractory ore chemistry Britannica

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Other articles where refractory ore is discussed gold processing Extraction from refractory ores Many gold-bearing ores and concentrates are not readily amenable to cyanidation, owing to the presence of substances that consume the cyanide reagent before it can dissolve the gold, preferentially adsorb the gold as it dissolves a phenomenon called preg-robbing , or ,...

Refractory and Non

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Refractory and Non-refractory are relative terms, and the degree to which any ore is amenable to cyanide extraction will range from near 0 through to near 100 Whether gold is refractory or non-refractory has a huge bearing on a potential mine s viability...

Biological Oxidation of refractory gold ore

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Here is a simplified presentation of how gold can be obtained from refractory gold ores using a combination of flotation and bacterial oxidation using thioba....

Biooxidation of Refractory Gold Ores

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Golden Day Conference New Frontiers in Gold Silver Hydrometallurgy was organised by the Department of Mining Engineering, Karadeniz Technical University ....