refractory ore gold and pretreatment 2012

Recovery Refractory Resources - SGS

September 2012 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-containing ore

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Pretreatment of refractory gold mines,grinding conditions ...

Gold pretreatment. 12-01-20; 45 Views; icon 0; The so-called refractory gold ore generally refers to a type of ore in which gold cannot be effectively leached by the cyanidation equipment even under fine grinding conditions without pretreatment. The gold of this type of ores is mostly encapsulated in associated minerals and gangue minerals in fine particles, so it cannot be in contact with ...

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Review Pretreatment Process on Refractory Gold Ores with As

refractory gold ores with As. Pretreatment options for deal-ing with refractory gold ores are illustrated in Fig. 1 and described in detail in the subsequent sections. 2. Roasting Oxidation Pretreatment So far, the application of roasting oxidation pretreatment has a history of 70 years. The principle is to destroy the ores tissue to make gold exposed by the means of roasting the flotation ...

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Mineralogy and Pretreatment of a Refractory Gold Deposit ...

The gravity–flotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of gold. The technological mineralogy of a gold deposit located in North-Western province of Zambia was carried out by using X-ray fluorescence spectroscopy (XRF), X-ray diffraction spectroscopy (XRD), and scanning electron microscope (SEM).

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Pretreatment Process on Refractory Gold Ores with As

The process of crushing or decomposition before gold leaching is called pretreatment of refractory gold. Statistics show that, in the world, about 2/3 gold resource belongs to the difficult processing ores, and about 1/3 total output of world gold is produced from refractory gold. This proportion will further increase in future. Therefore, pretreatment of arsenic-bearing refractory gold has an ...

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GOLD RECOVERY OF REFRACTORY SULFIDE CONCENTRATES

The problem of refractory sulfide gold ore that has a gold recovery less than 50% when direct cyanidation applied, still exists until now. It needs oxidative pretreatment for cyanidation to be effective in gold recovery the objective of this study is figuring out the effect of sodium nitrite as an oxidizing reagent on cyanidation of refractory gold ore. Cyanide leaching of the concentrate was ...

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(PDF) Bacterial leaching as a pre-treatment step for gold ...

The metallurgical operations at Fairview comprise a typical refractory gold processing plant treating the sulfidic ore body, a second plant treating the quartzitic ore, a flotation tailings treatment plant and Bacterial leaching 179 an arsenic refining plant. Typical ore and concentrate analyses for Fairview ore are depicted in Table 3. The BIOX leaching plant currently treats from 40% to 60% ...

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Review Pretreatment Process on Refractory Gold Ores with As

refractory gold ores with As. Pretreatment options for deal-ing with refractory gold ores are illustrated in Fig. 1 and described in detail in the subsequent sections. 2. Roasting Oxidation Pretreatment So far, the application of roasting oxidation pretreatment has a history of 70 years. The principle is to destroy the ores tissue to make gold exposed by the means of roasting the flotation ...

More

Pretreatment of refractory gold mines,grinding

Gold pretreatment. 12-01-20; 45 Views; icon 0; The so-called refractory gold ore generally refers to a type of ore in which gold cannot be effectively leached by the cyanidation equipment even under fine grinding conditions without pretreatment. The gold of this type of ores is mostly encapsulated in associated minerals and gangue minerals in fine particles, so it cannot be in contact with ...

More

Mineralogy and Pretreatment of a Refractory Gold

The gravity–flotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of gold. The technological mineralogy of a gold deposit located in North-Western province of Zambia was carried out by using X-ray fluorescence spectroscopy (XRF), X-ray diffraction spectroscopy (XRD), and scanning electron microscope (SEM).

More

Optimizing the alkaline oxidation pretreatment of a ...

28/09/2018  Optimization of the pretreatment process of gold refractory ore from Zarshuran gold mine was carried out using Taguchi method-orthogonal array optimization technique (OAOT). Design Expert software and ANOVA technique were employed to determine the influence of important factors affecting the process. Influential factors investigated in alkaline oxidation pretreatment process of gold

More

GOLD RECOVERY OF REFRACTORY SULFIDE CONCENTRATES

The problem of refractory sulfide gold ore that has a gold recovery less than 50% when direct cyanidation applied, still exists until now. It needs oxidative pretreatment for cyanidation to be effective in gold recovery the objective of this study is figuring out the effect of sodium nitrite as an oxidizing reagent on cyanidation of refractory gold ore. Cyanide leaching of the concentrate was ...

More

GOLD RECOVERY OF REFRACTORY SULFIDE

It needs oxidative pretreatment for cyanidation to be effective in gold recovery the objective of this study is figuring out the effect of sodium nitrite as an oxidizing reagent on cyanidation of refractory gold ore. Cyanide leaching of the concentrate was performed at 20%-w/w of solid (500 gram of refractory sulfide gold ore concentrate) in a 2.5-liter glass reactor with aeration and stirred ...

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gold refractory,ore classification,preprocessing methods

Classification of refractory ores. 1. Carbonaceous gold ore. There is organic carbon which can do ‘ Rob gold ’ in gold and silver ore, and it causes that gold is adsorbed in the cyanide solution, make ore difficult to cyanide and leach. Generally, we use roasting and chlorination pretreatment to destroy all or part carbon. Passivation ...

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(PDF) Bacterial leaching as a pre-treatment step for gold ...

The metallurgical operations at Fairview comprise a typical refractory gold processing plant treating the sulfidic ore body, a second plant treating the quartzitic ore, a flotation tailings treatment plant and Bacterial leaching 179 an arsenic refining plant. Typical ore and concentrate analyses for Fairview ore are depicted in Table 3. The BIOX leaching plant currently treats from 40% to 60% ...

More

(PDF) The Application of Roasting Pretreatment for ...

B12 THE APPLICATION OF ROASTING PRETREATMENT FOR ANTIMONIAL REFRACTORY GOLD AND SILVER ORES O Celep1, I Alp2 and H Deveci3 ABSTRACT The Akoluk ore deposit is located in southwest of Ordu city (Turkey) and in the western part of the Eastern Pontides, which consists mainly of volcanic-sedimentary rock units. Gold and silver contents of the ore are 20 and 220 g/ton,

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Pressure Oxidation Pretreatment Technology on

The principle,technological features and typical commercial applications of pressure oxidation technology on refractory gold ore were introduced.The behavior and control of arsenic during the pressure oxidation pretreatment was studied.The crystal structure and stability of arsenate taking into form under different conditions were discussed.

More

Mineralogy and Pretreatment of a Refractory Gold

The gravity–flotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of gold. The technological mineralogy of a gold deposit located in North-Western province of Zambia was carried out by using X-ray fluorescence spectroscopy (XRF), X-ray diffraction spectroscopy (XRD), and scanning electron microscope (SEM).

More

Optimizing the alkaline oxidation pretreatment of a ...

28/09/2018  Optimization of the pretreatment process of gold refractory ore from Zarshuran gold mine was carried out using Taguchi method-orthogonal array optimization technique (OAOT). Design Expert software and ANOVA technique were employed to determine the influence of important factors affecting the process. Influential factors investigated in alkaline oxidation pretreatment process of gold

More

The Oxidation Pretreatment of a Sulfidic Refractory Gold ...

An attempt has been made to study the pretreatment of sulfidic refractory gold ore with pyrolusite. The influences of various parameters were studied to optimize the conditions. The optimum leaching conditions were pyrolusite/gold ore mass ratio of 3.0, H2SO4 concentration of 3.0 M, temperature of 100°C, particle size of 45μm, stirring speed of 200 rpm.

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pretreatment of refractory ores prior to gold leaching

refractory ore gold and pretreatment 2012. These refractory ores require pre-treatment in order for cyanidation to be effective in recovery of the gold. A refractory ore generally contains sulfide minerals, organic carbon, or both. Sulfide minerals are impermeable minerals that occlude gold particles, making it difficult for the leach solution to form a complex with the gold. Improved gold and ...

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ACID OXIDATION PRETREATMENT OF REFRACTORY

A process for recovering gold from refractory auri- ferous iron-containing suiphidic ore comprising: feeding ground ore as an aqueous slurry to an acidic pretreatment step, treating the ground ore in the acidic pretreatment step with aqueous sulphuric acid solution to decompose car- bonate and acid consuming gangue compounds which might other- wise inhibit a subsequent pressure oxidation step ...

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Pressure Oxidation Pretreatment of Refractory Gold ...

01/02/1984  Pressure oxidation of gold containing concentrates and ores is an effective pretreatment for liberating refractory gold. This is particularly true when an appreciable portion of the gold is associated with sulfides and is not amenable to conventional cyanidation. A brief review of the literature on pressure oxidation of refractory gold materials is presented.

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gold refractory,ore classification,preprocessing methods

Classification of refractory ores. 1. Carbonaceous gold ore. There is organic carbon which can do ‘ Rob gold ’ in gold and silver ore, and it causes that gold is adsorbed in the cyanide solution, make ore difficult to cyanide and leach. Generally, we use roasting and chlorination pretreatment to destroy all or part carbon. Passivation ...

More

GOLD RECOVERY OF REFRACTORY SULFIDE

It needs oxidative pretreatment for cyanidation to be effective in gold recovery the objective of this study is figuring out the effect of sodium nitrite as an oxidizing reagent on cyanidation of refractory gold ore. Cyanide leaching of the concentrate was performed at 20%-w/w of solid (500 gram of refractory sulfide gold ore concentrate) in a 2.5-liter glass reactor with aeration and stirred ...

More

(PDF) The Application of Roasting Pretreatment for ...

B12 THE APPLICATION OF ROASTING PRETREATMENT FOR ANTIMONIAL REFRACTORY GOLD AND SILVER ORES O Celep1, I Alp2 and H Deveci3 ABSTRACT The Akoluk ore deposit is located in southwest of Ordu city (Turkey) and in the western part of the Eastern Pontides, which consists mainly of volcanic-sedimentary rock units. Gold and silver contents of the ore are 20 and 220 g/ton,

More

Pressure Oxidation Pretreatment Technology on

The principle,technological features and typical commercial applications of pressure oxidation technology on refractory gold ore were introduced.The behavior and control of arsenic during the pressure oxidation pretreatment was studied.The crystal structure and stability of arsenate taking into form under different conditions were discussed.

More

Pressure Oxidation Pretreatment of Refractory Gold ...

01/02/1984  Pressure oxidation of gold containing concentrates and ores is an effective pretreatment for liberating refractory gold. This is particularly true when an appreciable portion of the gold is associated with sulfides and is not amenable to conventional cyanidation. A brief review of the literature on pressure oxidation of refractory gold materials is presented.

More

Optimizing the alkaline oxidation pretreatment of a ...

28/09/2018  Optimization of the pretreatment process of gold refractory ore from Zarshuran gold mine was carried out using Taguchi method-orthogonal array optimization technique (OAOT). Design Expert software and ANOVA technique were employed to determine the influence of important factors affecting the process. Influential factors investigated in alkaline oxidation pretreatment process of gold

More

The Oxidation Pretreatment of a Sulfidic Refractory Gold ...

An attempt has been made to study the pretreatment of sulfidic refractory gold ore with pyrolusite. The influences of various parameters were studied to optimize the conditions. The optimum leaching conditions were pyrolusite/gold ore mass ratio of 3.0, H2SO4 concentration of 3.0 M, temperature of 100°C, particle size of 45μm, stirring speed of 200 rpm.

More

A two-stage bacterial pretreatment process for double ...

A two-stage bacterial pretreatment process for double refractory gold ores R.K. Amankwah a,*, W.-T. Yen a, J.A. Ramsay b a Mining Engineering Department, Queen’s University, Kingston, Ontario, Canada K7L 3N6 b Chemical Engineering Department, Queen’s University, Kingston, Ontario, Canada K7L 3N6 Received 7 April 2004; accepted 11 May 2004 Abstract Double refractory gold

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pretreatment of refractory ores prior to gold leaching

The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching. The ore assayed 20 g/t Au and 220 g/t Ag and contained predominantly quartz/clay and barite, and to a lesser extent, sulphides such as pyrite, stibnite, sphalerite, zinkenite (Pb 9 Sb 22 S 42) and andorite (Sb 3 PbAgS 6).The latter mineral was identified to be the most important ...

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Pretreatment Of Refractory Ores In Gold Leaching

refractory ore gold and pretreatment 2012 Zimbabwe - XSM. refractory ore gold and pretreatment ... pretreatment of refractory ores prior to gold leaching ... » new crushing refractory ore gold and pretreatment ... Read more. gold processing flow diagram refractory ore. pretreatment processes in gold recovery by thiosulphate leaching. In case of highly refractory ores, ... Pretreatment ...

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(PDF) The Application of Roasting Pretreatment for ...

B12 THE APPLICATION OF ROASTING PRETREATMENT FOR ANTIMONIAL REFRACTORY GOLD AND SILVER ORES O Celep1, I Alp2 and H Deveci3 ABSTRACT The Akoluk ore deposit is located in southwest of Ordu city (Turkey) and in the western part of the Eastern Pontides, which consists mainly of volcanic-sedimentary rock units. Gold and silver contents of the ore are 20 and 220 g/ton,

More

Research status of carbonaceous matter in carbonaceous ...

Key words: carbonaceous gold ores; carbonaceous matter; pretreatment; bio-oxidization; research status 1 Introduction The gold ores mainly are categorized into two types: non-refractory and refractory. With the increasing exhaustion of non-refractory gold ores, refractory gold ores have become main materials of the gold industry, and nearly one third of gold comes from refractory gold ores

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Developments in the pretreatment of refractory gold ...

processing refractory gold ores, especially development in the pretreatment of refractory gold minerals by nitric acid. These processes include the high-pressure and the atmospheric-pressure oxidation methods. High-pressure oxidation processes are difficult to carry out, because they require high-capital cost autoclaves. Atmospheric-pressure oxidation processes are easier to manipulate, but ...

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