refractory ore processing

Roasting and Refractory Gold Ore - Manhattan Gold & Silver

During roasting, refractory gold ore is treated with extremely hot air. This causes the sulfites to oxidize, separate from the ore, and become sulfur dioxide. Once all of the sulfides are oxidized, the remaining gold ore can be processed normally. The roasting method has been around for hundreds of years. Prior to the 20th century, the process ...

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The Mining Process - Newmont Corporation - About Us

Refractory ore resists normal processing methods as the high sulfide minerals trap gold particles, making it difficult for the cyanide to reach the gold and leach it. Heating To leach gold from refractory ore, it must be subjected to high temperature, high pressure and/or oxygen.

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(PDF) Refractory gold-bearing ores: a review of treatment ...

At this moment the application of the IBES process to refractory gold-bear- ing ores is being studied. Batch and semi-continuous tests have already shown the viability of this process for the pretreatment of arsenopyrite-pyrite gold- bearing concentrates [ 50 ]. A refractory gold concentrate, assaying 20 ppm Au, 25.1 ppm Ag, 12% As, 15.8% Fe ...

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Increasing refractory gold production for Petropavlovsk ...

The mining of refractory ore is becoming increasingly common in Russia's numerous operational gold mines, with the process requiring additional pre-treatment prior to cyanidation for gold recovery. Enabling profitable processing of challenging ore. Close to 50% of Petropavlovsk's 21 Moz of resources and reserves are now classified as ...

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Processing Refractory Gold - Hydrometallurgy: Leaching in ...

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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Advances in Gold Ore Processing - Google Books

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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Refractory Gold Technology

Sherritt had also provided extensive process development services to Homestake Mining Company, leading to the first commercial application of pressure oxidation for refractory gold ore treatment, at the McLaughlin Gold Complex in California, commissioned in 1985. Refractory Gold Technology

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gold refractory,ore classification,preprocessing methods

The reasons of gold refractory, ore classification, and preprocessing methods. I. The reason of the gold mineral refractory. There are so many types of reasons that caused the difficulty of gold ore processing, including physical element, chemical element, and mineralogical element. In summary, the difficulties consist of the following ...

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Refractory - Wikipedia

Refractory bricks in a torpedo car used for hauling molten iron. A refractory material or refractory is a material that is resistant to decomposition by heat, pressure, or chemical attack, and retains strength and form at high temperatures. Refractories are polycrystalline, polyphase, inorganic, non-metallic, porous, and heterogeneous.

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Refractory gold ores: Challenges and opportunities for a ...

Inclusion of refractory processing plants in a miner's asset list may unlock the value of refractory-type reserves in other locations. Miners could ship high-grade refractory ore or concentrate from several mines to centralized processing facilities designed to process difficult ores—an approach already employed by Russian miners ...

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How to Process Copper Ore: Beneficiation Methods and ...

As for the grinding and floating process, it is more advantageous to adopt the stage grinding and floating process for refractory copper ore, such as the re-grinding and re-separation of coarse concentrate, re-grinding and re-separation of bulk concentrate, and separate treatment of medium ore. 2. Beneficiation methods of copper oxide ore

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TECHNOLOGY FOR PROCESSING OF REFRACTORY GOLD …

TOMS institute conducted testing of the Albion Process™ aimed at liberation of finely disseminated gold from the flotation concentrate resulted from processing of a refractory ore of one of Russian gold deposits. Concentrate description Gold grade of the head flotation concentrate was 29.6 g/t. The concentrate size was 80% -80 um.

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Refractory ore | chemistry | Britannica

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 completely surround the…

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US4559209A - Leaching refractory gold ores - Google Patents

A method is disclosed for leaching a gold ore which is refractory due to the presence of sulphide minerals of arsenic and antimony. The ground ore is leached with cyanide in a pipe reactor at a pressure of between 5 and 8 MPa. The terminal pH value of the pulp is controlled to be 10 or less than 10.

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(PDF) Biooxidation of sulfidic refractory gold ores ...

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 ores.

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POX Hub – Petropavlovsk PLC

Pressure oxidation technology is the most efficient and environmentally-friendly technology for processing refractory gold ore and enables the Group to unlock the value embedded within c.5.31Moz of its own refractory reserves (including double-refractory ore), as well as treat 3 rd party refractory material and future potential to exploit high ...

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Options to Treat Refractory Ores - Albion Process

249 EVALUATING PROCESS OPTIONS FOR TREATING SOME REFRACTORY ORES By 1Mark Aylmore and 2Ashraf Jaffer 1Bateman Engineering Pty Ltd Australia 2Bateman Engineering Pty Ltd South Africa Presenter and Corresponding Author Mark Aylmore [email protected]

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Gold Mining Process Development – Denver Mineral Engineers

REFRACTORY ORE PROCESSING. The common definition of "refractory" gold ores, are those ores that do not allow the recovery of gold by standard gravity concentration or direct cyanide leaching. One major category of refractory ores are gold values contained within the crystalline structure of sulfide minerals such as pyrite and arsenopyrite.

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Processing refractory ores gets easier with new equipment

Refractory ores. 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 …

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Recovery Refractory Resources - SGS

one set procedure for refractory gold ore processing, SGS looks at every situation separately, to evaluate which option is the best fit." ROASTING Roasting is generally applied to sulphide minerals and refractory ores. It involves a thermal gas-solid reaction during which sulphides and sometimes organic carbon are oxidised to SO 2 and carbon ...

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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. Refractory pre-treatment processes include pressure oxidation, biological oxidation and various forms of ...

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Processing of refractory gold ores - ScienceDirect

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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Refractory Gold Ore Treatment Methods

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 …

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Processing of refractory gold ores - ScienceDirect

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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Refractory and Non-Refractory Ore - Gold Companies Explained

Refractory ore is undesirable because the methods needed to enable gold extraction are expensive. 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 ...

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11.5 Refractory Manufacturing

Refractory manufacturing involves four processes: raw material processing, forming, firing, and final processing. Figure 11.5-1 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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US4919715A - Treating refractory gold ores via oxygen ...

Gold-containing ores, having refractory sulfidic matter or a combination of refractory sulfidic matter and refractory carbonaceous matter, are processed to recover their gold values. The process uses an ore roasting procedure that utilizes a two-state, fluidized bed roaster. The process also employs a pure oxygen atmosphere during roasting.

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Extraction of Gold from a Low-Grade Double Refractory Gold ...

The treatment process of a low-grade refractory gold ore containing sulfide minerals and carbonaceous matters was studied in this work. The gold extraction of this ore by all-sliming cyanidation was only 11.75%. Hence, a pretreatment was necessary. In this paper, a flotation-preoxidation-cyanide leaching process was developed.

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Process Flow-Sheet for Gold and Antimony Recovery from ...

An extraction process that includes Na 2 SO 4 assisted roasting and alkaline Na 2 S leaching is shown to be able to achieve a gold recovery of over 95% from the refractory ore. View Show abstract

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(PDF) Cyanidation of Refractory Gold Ores: A Review

Directions for future research in processing refractory gold ores has been stated. Schematic diagram of physically locked gold in pyrite, quartz and/or iron oxide. Modified after Ellis (2003)

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China aims to increase self-sufficiency on iron ore with ...

The main reason behind China's dependency on imported iron ore is that the country's iron ore is relatively low-grade and expensive to process. Ever since 35-year-old Sun Yongsheng acquired a doctorate in mining science six years ago, he has dedicated his time to one thing – highly efficient exploitation technology for refractory iron ore ...

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Review Pretreatment Process on Refractory Gold Ores with As

process which can oxidize and dispose of components of the ore through adding chemical reagents. Meng Yuqun, Wu Minjie, etc. have researched to strengthen Fig. 1. General process options for pretreating refractory gold ores. Fig. 2. Block diagram of the two stage roasting process. Fig. 3. Block diagram of the chemical leaching process.

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Leaching Guide of Refractory Gold Ore - cnlitereagent.com

3.Strategies for Processing Refractory Gold Ore. With the increase in gold demand and the large-scale mining of gold, gold with high grade and quality as well as easy access to exploit is decreasing, the proportion of refractory gold ore is larger than ever before. Statistics show that the proportion of refractory gold ore is as high as 60% -70 ...

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