refractory ore processing

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Refractory and Non

Non-refractory ore is where cyanide can be used to extract the gold This is desirable as it means the process will be cheaper 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...

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Gold mineral processing

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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Advances in Gold Ore Processing

Dec 02, 2005 0183 32 The gold processing industry is experiencing change As free-milling and oxide ores become depleted, more complex polymetallic and refractory ores are being processed, coupled with increasing pressure for stricter environmental compliance Recent years have also seen a steady reduction in mineral processing and metallurgy graduates and a gradual loss of older operating ,...

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115 Refractory Manufacturing

Refractory manufacturing involves four processes raw material processing, forming, firing, and final processing Figure 115-1 illustrates the refractory manufacturing process Raw material processing consists of crushing and grinding raw materials, followed if necessary by size classification and raw materials calcining and drying...

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Diagnostic Leaching For Refractory Gold Ores SRK Consulting

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 sample with progressively stronger reagents ....

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Rebellious Ores Sulfides, Selenides and Tellurides

The early day miners feared it, and it happened a lot more often than they would have liked the easily worked rich surface ores they discovered on the surface gave way as they mined downward, to a vein full of sulfides, base metals and other nasty, rebellious and refractory or...

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Processing refractory ores gets easier with new equipment

Refractory or One of the major challenges to economically recovering gold from many ore bodies is the presence of certain impurities, like sulphides, organic carbon or arsenic, which can make the ore resistant to normal processing techniques like cyanidation and carbon adsorption...

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Gold extraction

Also, grinding the ore to an extremely fine particle size can liberate gold encapulsated in sulfid 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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double refractory gold ores

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 gt gt Chat Online Metallurgical Process Difficulties Developing Flowsheets ....

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Gold Extraction and Recovery Processes

Refractory ore processing 7 Alternative lixiviants Amalgamation This is an ancient process which involves the alloying of the gold particles with metallic mercury to form amalgam and then the separation of the gold from the mercury by heating in retorts until the mercury is...

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Learn About Refractory Metals

Dec 10, 2018 0183 32 Refractory metal-based alloys and carbides are used in virtually all major industries, including electronics, aerospace, automotive, chemicals, mining, nuclear technology, metal processing,...

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Gold extraction

This portion of the article will focus on the origins, characteristics, and required processing techniques for free-milling, complex and refractory or Cyanidation Response At the most basic level, the response that an ore has to conventional cyanidation is the key factor in determining its gold ore ,...

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Processing Refractory Gold

May be increasing gold recovery from refractory gold ore with grade 2-3 g/t to 90-95 ?Actual data of top refractory gold ore mines show, that gold recovery is 70 and less What is reason? It is a problem in minerals processing or it is a global science problem? So if you work with refractory ore....

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Refractory solutions for ore processing Allied Mineral ,

Mineral Processing Iron Ore Quality minerals come from quality ore dressing techniqu Since ore processing is a critical base for many metallurgical practices, Allied enhances it with refractories designed for maximum performance and precision installation Let us help protect your equipment from...

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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 form of microscopic or submicroscopic lattice...

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PDF Treatment of a Copper

The TORCO process or Treatment of Refractory Copper Ores involved a reduction roast using salt and coal of the refractory copper silicate ore in a fluid bed roaster to reduced the copper to the ....

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Refractory Gold Ore Processing

Refractory Gold Ore Processing is an efficient method to process refractory gold ore By directly using conventional cyanidation methods, the recovery rate of gold is low So pre-treatment of refractory gold ore is added to the processing line, which increased improve enterprise production benefit...

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Copper extraction

Copper extraction refers to the methods used to obtain copper from its orThe conversion of copper consists of a series of physical and electrochemical process Methods have evolved and vary with country depending on the ore source, local environmental regulations, and other factors...

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Barrick Gold Corporation

Oct 06, 2016 0183 32 Meanwhile, the mine s autoclave circuit had significant excess capacity, and was at risk of shutting down The challenge was to develop a process that would treat double refractory ore using the autoclave circuit, therefore unlocking the value of the stockpil In 2009, the site began testing the thiosulfate process in a laboratory setting...

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Processing of refractory gold ores

The best choice of a processing route to treat a refractory ore will in most cases be site specific, due mainly to the metallurgical and mineralogical characteristics of the ore The successful application of these processing techniques can result in mining operations that would otherwise have been impossible...

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The BIOX® Process for Biooxidation of Gold

Abstract GENCOR SA Ltd has pioneered the commercialization of biooxidation of refractory gold or Development of the BIOX ® process started in the late 197os at GENCOR Process Research, in Johannesburg, South Africa The early work was championed by Eric Livesey-Goldblatt, the manager of GENCOR Process Research who directed pioneering and innovative research into bacterial oxidation ,...

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Processing of refractory gold ores

Processing of refractory gold ores 1037 The oxidation tanks themselves are often configured in four stages with additional tanks employed in the first stage to accommodate the increased oxidation rates and aeration requirements in the initial phases of the reaction Residence times in the tanks are often of the order of 3 to 4 days...

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Recovery Refractory Resources

148 PRECIOUS METALS PROCESSING Recovering refractory resources Refractory gold ore needs pre-treatment for cyanidation to be effective in gold recovery Ailbhe Goodbody looks at the advantages and disadvantages of the most common pre-treatment options, and speaks to some companies that offer or use the processes A refractory gold ore is gold-...

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Process for recovering gold and silver from refractory ores

Ores having both problems are known as double refractory or A common method of treating refractory gold ores to render the gold recoverable by cyanidation is by pressure oxidation in autoclav Pressure oxidation oxidizes sulfide minerals, rendering the residue non-refractory...

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Gold processing 101

Refractory ores are typically treated by flotation and the resulting flotation concentrate may be sold directly to a smelter common for example in China or subjected to downstream processing by pressure oxidation or bio-leach...

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REFRACTORY GOLD

REFRACTORY GOLD By definition, refractory gold ores contain gold that is resistant to extraction by conventional chemical processing and as a result responds poorly to traditional gold cyanidation techniques such as Carbon-in-Leach CIL , yielding less than 80 of the contained gold...

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Process for treating refractory gold ores by roasting ,

Process for treating refractory gold ores by roasting under oxidizing conditions Article in Minerals and Metallurgical Processing 17 1 1-6 February 2000 with 991 Reads How we measure reads...

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Microwave Heating Applications in Mineral Processing ,

The vast majority of refractory gold occurs in sulphidic minerals such as pyrite FeS 2 , arsenopyrite FeAsS and pyrrhotite FeS Generally, refractory gold concentrate or ore is pretreated by roasting, O 2-pressure leaching or bacterial leaching, to render it amenable to gold recovery by alkaline cyanide leaching Haque, 1987a, b 51, 52 ....

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Processing refractory ores gets easier with new equipment

Technology Processing refractory ores gets easier with new equipment Collaboration between Kingston Process Metallurgy KPM and Barrick Gold has resulted in the development of a two-inch continuous fluid bed roaster that should allow inexpensive testing of small ore samples, like those from drill core from prospective projects...

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ALTA Gold 2012 E

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 factors such as...

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