preg robbing gold in autoclave o idation

Preg-robbing gold ores - ScienceDirect

 · Gold losses due to preg-robbing during cyanidation of carbonaceous ores may vary from less than 20% to as much as 90% ( Stenebråten et al ., 2000 ). Carbonaceous material occurs in many deposits around the world, as shown in Table 1 …

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PREG-ROBBING OF GOLD IN CHLORIDE-BROMIDE …

 · The tendency of preg-robbing was demonstrated by adding carbon in a non-preg-robbing ore. It was shown that the preg-robbing tendency in the chloride-bromide media was very strong. Addition of 0.01% w/w of carbon powder into the non-preg-robbing ore decreased gold recovery from 92 to 70% and addition 5% w/w of carbon decreased gold recovery to

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Preg-robbing gold ores - ScienceDirect

In case of certain ores, gold recovery by cyanidation is limited by the presence of naturally occurring carbonaceous material that adsorbs gold from alkaline cyanide solution unless steps are taken to prevent this adsorption reaction from occurring. Such ores are most often referred to as preg-robbing ores.

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preg robbing gold in autoclave oxidation

Abstract: A double refractory gold ore contains gold particles locked in sulphides, solid-solution in arsenopyrite, and preg-robbing material such as carbonaceous matter, and so on. The diagnostic leach test (DLT) and preg-robbing (PR) approaches are widely used to investigate the occurrence and the distribution of refractory gold.

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Minerals | Free Full-Text | CIL Gold Loss …

 · A double refractory gold ore contains gold particles locked in sulphides, solid-solution in arsenopyrite, and preg-robbing material such as carbonaceous matter, and so on. The diagnostic leach test (DLT) and preg …

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Extract gold from pregnant robbing carbonaceous ores

 · the overall concept is to separate the preg robbers out ahead of the leach if possible to do so, then in the leach its a competition between carbon and the preg robbers as to which one gets the gold fastest - this means to maintain high activities through regular regeneration, maintain a relatively high carbon inventory in circuit and configure …

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cil gold autoclave - auberge-desvoyageurs.fr

A double refractory gold ore contains gold particles locked in sulphides, solid-solution in arsenopyrite, and preg-robbing material such as carbonaceous matter, and so on. The diagnostic leach test (DLT) and preg-robbing (PR) approaches are widely used to investigate the occurrence and the distribution of refractory gold.

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pressure oxidation autoclave au - diver.waw.pl

Autoclave Pressure Oxidation Gold Au Grinding Mill . deportment of gold in an autoclave pressure eportment of gold in an autoclave pressure oxidation ac-poxcarbon in leach cil residue of preg-robbed surface gold in two different forms metallic gold and au free online chat processes autoclaving circuit gulinc, canadian important ...

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Characterization of Preg-Robbing Carbonaceous Minerals …

 · With over 260 tons of gold reserves, the Shuiyindong gold mine is one of the largest Carlin-type gold deposits in China. A particular challenge in the processing of the ore is the presence of carbonaceous compounds, which can cause substantial losses in recoveries via the preg-robbing and adsorption of gold. To investigate the structural properties of the native …

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autoclave pressure oxidation gold au c grinding mill china

preg robbing gold in autoclave oxidation - morleyiga.com.au. Autoclave pressure oxidation followed by carbon-in-leach (CIL) cyanidation was the process of choice, even though the Twin Creeks ores contain preg-robbing organic carbon. Laboratory tests showed that optimum operating conditions were as follows: a fine grind size of 80% passing 20 to ...

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autoclave autoclave pressure o idation gold au grinding …

autoclave gold recovery plant - banker-sacoza autoclave equipment gold extraction singapore autoclave gold recovery plant BINQ Mining Apr 19, ; The gold recovery is low and a gold deportment study of the CIL residue was the need for optimization of the oxidation process in the autoclave facility Live Chat. More

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deportment of gold in an autoclave pressure oxidation ac

Depending on the conditions within the autoclave, acid containing iron compounds can be formed.autoclave gold recovery plant - Mining, Deportment of gold in an autoclave pressure oxidation (AC-POX The gold recovery is low and a gold deportment study of the CIL residue was the need for optimization of the oxidation process in the ...

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preg robbing gold in autoclave o idation - babel-babel.it

The tendency of preg-robbing was demonstrated by adding carbon in a non-preg-robbing ore. It was shown that the preg-robbing tendency in the chloride-bromide media was very strong. Addition of 0.01% w/w of carbon powder into the non-preg-robbing ore decreased gold recovery from 92 to 70% and addition 5% w/w of carbon decreased gold recovery to

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Standard preg-robbing test procedure - Hydrometallurgy: …

 · Tailing samples were taken from each of the bottles and fire assayed to determine the residual gold. Preg-robbing test. Dried ores were taken through crushing and ball milling to 80% passing 106 pm prior to preg-robbing test. Duplicates of each sample weighing 10 g were used to contact 25 ml of 16 pg/mL gold solution and agitated at 200 rpm in ...

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Laccase-mediator system for enzymatic degradation of …

 · 1.Introduction. The cyanidation process has been a royal road to extract gold (Au) from gold ores and utilized for over 130 years in industrial mining because of the high efficiency and reaction rate of the formation of Au(CN) 2 − (Anderson, 2016; Bas et al., 2017).Non-refractory gold ores, in which gold can be easily extracted by cyanidation, are currently under fast …

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Autoclave oxidation of refractory gold-sulfide …

Different methods allowing to decrease gold wastes in preg robbing are considered. Behavior of sulfides and gold during autoclave oxidation of concentrates is described using thermodynamical models, and possibility of metallic gold dissolution with anion [AuCl4]– forming and its adsorption on organic carbon particles is shown.

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pressure oxidation autoclave - jakkalsvallei.co.za

FI126061B - Autoclave for pressure oxidation - Google Patents. FI126061B - Autoclave for pressure oxidation - Google Patents Autoclave for pressure oxidation Download PDF Info ... autoclave tin tin layer Prior art date Application number FI20136261A Other languages Finnish (fi) Swedish (sv) Other versions FI20136261A (en Inventor

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Practical Treatment Options for Carbonaceous Preg …

 · The Use of Mercury to Inhibit Autoclave Preg-Robbing of Gold Commercial Production of High Purity Nickel Cathode from Cop Geometallurgy – The Key to Improving Your Mine Value Chain Characterization of Solid Phases in the Iron-Sulfate-Water S The Technology of CO2 Sequestration by Mineral Carbonation:

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The leaching and adsorption behaviour of gold ores

 · 5.3 preg-robbing behaviour by the ores at low cyanide concentrations 118 5.4 the effect of activated carbon and cyanide on the reversibility of preg-robbing 122 5.5 the role of fe(cn)6 4-in preg-robbing 127 5.6 comparison of preg-robbing between the concentrates and gold-free mineral samples 131 5. 7 interactions of met al-cy an1de species ...

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Deportment of gold in an autoclave pressure oxidation …

The gold deportment data show that 37.5% of the gold losses in the CIL residue are related to sub-microscopic gold contained in the unoxidized pyrite mineral phase (Figure 1). The carbonaceous matter present in the ore exhibits strong preg-robbing capacity and contributes to 44.5% of the gold losses in the form of surface gold (Figure 1). Figure 1.

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Preg-robbing of gold from cyanide and non-cyanide …

Unlike the cyanide system, interaction of thiourea and thiosulfate systems with carbonaceous matter (CM) has not received much research attention. As non-cyanide reagents become important alternatives for gold leaching, it is imperative to assess the degree of gold adsorption (preg-robbing) in these systems and find ways of reducing this effect.

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The Use of Mercury to Inhibit Autoclave Preg-Robbing of …

The previous research done by SRC Hydrometallurgy showed that autoclave preg-robbing of gold could be significantly inhibited by the addition of mercury(II) compounds to POX slurry. The positive effect of mercury(II) was well pronounced both at high (>20 mg/L) and low ( 5 mg/L) Cl concentrations in POX solution.

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Deportment of gold in an autoclave pressure …

The gold deportment data show that 37.5% of the gold losses in the CIL residue are related to sub-microscopic gold contained in the unoxidized pyrite mineral phase (Figure 1). The carbonaceous matter present in the ore exhibits strong …

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preg robbing gold in autoclave oxidation - captain-sarah.de

 · preg robbing gold in autoclave oxidation. A process for recovering gold in which an ore slurry of refractory sulfidic and refractory carbonaceous ore having pregrobbing characteristics due to the presence of organic carbon is subjected to pressure oxidation in an autoclave the oxidized ore slurry is mixed with a thiosulfate salt lixiviant, which mixture is maintained at a ph …

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Organic Carbon TOC Pre-Flotation

 · The preg‐robbing tests were conducted with three levels of gold solution, 0 mg/litre or blank, 3mg/litre. Some samples were subjected to even higher spike values of 12mg/litre. To calculate the percent adsorption of gold …

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An investigation of the carbonaceous component of …

 · its capacity to preg-rob gold. From this, a simple and robust method has been developed based on the Raman spectra of the sample and carbonaceous material content to predict the preg-robbing capacity of an ore. The potential exists to develop a predictive tool using Raman spectroscopy for characterising the preg-robbing capacity of an ore.

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Use of ion-exchange resins to deal with the effect of preg …

 · The suggested concept was used to diminish the loss of gold via partial oxidation of metallic gold in autoclave processing of pyrite- and arsenopyrite-containing concentrates. ... Fedyukevich, V.A., Kubyshkin, S.A., Blokhin, A.A. et al. Use of ion-exchange resins to deal with the effect of preg-robbing of gold in the course of cyanide leaching ...

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preg robbing gold in autoclave oxidation

Carbonaceous gold ores have the ability to adsorb gold I cyanide from leach solutions during processing This phenomenon known as preg-robbing is responsible for poor recoveries as the carbonaceous materials of the ore compete with activated carbon used during the leaching and adsorption phase of processing Chemical oxidation of carbonaceous materials by different …

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Practical Treatment Options for Carbonaceous Preg …

 · The phenomenon is usually referred to as 'preg-robbing' dating from the times before the use of granular activated carbon for gold recovery, when gold was lost from the pregnant solution before it could be separated from the leach solids and recovered by cementation.

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Pore Evolution in Refractory Gold Ore Formed by …

 · Refractory gold ore is usually affected by the associated carbonaceous matter through the preg-robbing effect, which is eliminated by oxidation roasting, followed by leaching, to achieve a satisfactory gold leaching efficiency. Roasting–leaching experiments, pore structure measurements, scanning electron microscopy (SEM), and X-ray diffraction are used to explore …

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The MACH and preg-robbing - GoldOre

 · Method 1. PRI or preg-robbing index involves contacting a 10ppm gold solution with a specified mass of the sample and contacting over a 24hr time period. Gold in solution values are measured and the preg-robbing index is then calculated. This is good as it is a relatively simple standard procedure that can be useful for geometallurgical ...

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PREG-ROBBING CARBONACEOUS MATTER: AN …

 · Gold losses related to carbonaceous matter (CM) during processing are a significant problem in the gold processing industry. Inherent CM in gold ores can behave similarly to activated carbon in its ability to adsorb gold cyanide. This phenomenon is termed preg-robbing as the surface adsorbed gold cannot, for the most part, be recovered.

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PROCEDURE FOR CHARACTERIZATION OF …

 · matter present in the Carlin type carbonaceous sulphide ores has shown varying degree of preg-robbing activity [1-3]. In that regard it is important to develop technology and procedures for: the evaluation of the preg-robbing capacity and direct quantitative determination of the surface gold preg-robbed on the carbonaceous matter.

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preg robbing gold in autoclave oxidation

Research status of carbonaceous matter in carbonaceous pregrobbing [3−5] The famous carbonaceous refractory gold ores include the Carlin gold mine in Nevada of USA, the Kerr Anderson mine in Canada, the Ashanti and Prestea Gold Mines in Ghana and the Bakyrchik and Natalkinsk mines of the Soviet Union [6−8] The plenty of large carbonaceous gold ores have …

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