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MICROWAVE IRRADIATION PRETREATMENT OF A REFRACTORY GOLD

Jan 01, 1987· Microwave energy was applied in the pretreatment of a typical refractory arsenopyritic gold concentrate. More than 80% of As and S were volatilized off as As 2 O 3 and SO 2; whereas iron was oxidized mostly to hematite (Fe 2 O 3).All the gold was present in the calcine which responded favourably to the conventional alkaline cyanidation process and yielded 98% of Au and 60% of Ag

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Microwave pretreatment of a double refractory gold ore

Sep 01, 2007· With regards to the application of microwaves to refractory gold ores, Haque, 1987a, Haque, 1987b has studied the microwave pretreatment of refractory sulphidic ores and achieved gold extractions of over 98%. However, there is no information published on the microwave processing of the double refractory gold ores.

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Microwave pretreatment of a double refractory gold ore

One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic carbon. In this research, microwave roasting of a double refractory gold ore was investigated as an alternative method and the results were compared to those obtained by conventional roasting.

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Microwave pretreatment of a double refractory gold ore

One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic carbon. In this research, microwave roasting of a double refractory gold ore was investigated as an alternative method and the results were compared to those obtained by conventional roasting.

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Microwave pretreatment of a double refractory gold ore

Download Citation Microwave pretreatment of a double refractory gold ore Double refractory gold ores, such as Barrick’s Goldstrike ore, contain both pyrite and carbonaceous matter and the

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Study on microwave pretreatment of refractory

By using the heating feature of microwave, it has shown from condition tests that the gold leaching recovery can be improved from 74 % to more than 90 % if the gold concentrates is treated for 5...

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pretreatment of refractory gold ore with microwaves

Dec 08, 2020· Review Pretreatment Process on Refractory Gold Ores with As. refractory gold ore.8,9) 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.

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microwave pretreatment of a double

Aug 17, 2020· pretreatment of refractory gold ore with microwaves. Microwave pretreatment of a double refractory gold ore. Double refractory gold ores, such as Barrick’s Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic

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Experimental Study on Microwave Pretreatment with some

Request PDF Experimental Study on Microwave Pretreatment with some Refractory Flotation Gold Concentrate The microwave pretreatment of a typically refractory flotation gold

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Review Pretreatment Process on Refractory Gold Ores with As

mainly about the refractory gold leaching easily through arsenic removal to expose gold, changing the composition, physic-chemical and electro-chemical properties of the ore. Currently, there are four main methods of pretreatments of refractory gold ores with As. Pretreatment options for deal-ing with refractory gold ores are illustrated in Fig

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Microwave pretreatment of a double refractory gold ore

Abstract Double refractory gold ores, such as Barrick’s Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching. One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic carbon. In this research, microwave roasting of a double refractory gold ore was investigated as an

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pretreatment of refractory gold ore with microwaves

Dec 08, 2020· Review Pretreatment Process on Refractory Gold Ores with As. refractory gold ore.8,9) 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.

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(PDF) Recovery of Gold from the Refractory Gold

Apr 28, 2020· The leaching efficiencies of metal ions (As, Cu, Zn, Fe, and Pb) and recovery of gold from refractory gold concentrate were investigated via nitric acid leaching followed by microwave treatment.

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Experimental Study on Microwave Pretreatment with some

The microwave pretreatment of a typically refractory flotation gold concentrate was investigated. The results demonstrated that a maximum gold recovery of 97% was achieved, and that gold recoveries of the refractory gold concentrate quickly increased to the maximum with microwave heating time. Adding additives during microwave heating process was helpful to improve the leaching rate of gold

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Potential pre-treatment and processing routes for recovery

2.1 Microwave pre- treatment of refractory gold ores . Most of refractory gold occurs within sulphide minerals such as FeS 2 and FeAsS and are treated by roasting, pressure leaching or bacterial leaching to render the gold amenable to recovery by subsequent treatment techniques (Haque, 1987).

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microwave pretreatment of a double

Aug 17, 2020· pretreatment of refractory gold ore with microwaves. Microwave pretreatment of a double refractory gold ore. Double refractory gold ores, such as Barrick’s Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic

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Optimizing the alkaline oxidation pretreatment of a

Sep 28, 2018· Microwave pretreatment: Biooxidation (BIOX) pre-treatment of refractory gold concentrates using mixotrophic and chemolithotrophic bacteria on the gold extraction during cyanidation indicated 91.4% gold could be extracted by mixotrophic bacteria for 14 days, and it was 18% higher than the extraction level of direct cyanidation of the

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Application Note Refractory Gold Pretreatment pH

Refractory Gold Pretreatment pH 2 Bacterial Oxidation Bacterial oxidation (Bio-oxidation) of refractory ores was first launched in the mid-1980's. Bio-oxidation uses bacteria of the Acidithiobacillus genus to metabolize sulfides, arsenic and iron into water soluable compounds. There are several patented bio-oxidation processes

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refractory ore gold and pretreatment 2020

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

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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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US5824133A Microwave treatment of metal bearing ores and

The present invention provides a new and useful method for bringing about a metallurgical effect in a metal-containing ore or concentrate comprising treating said ore in a resonant microwave cavity while maximizing electric field strength in the area of said ore in said cavity.

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Microwave Heating Applications in Mineral Processing

Nov 07, 2012· 2.5. Microwave assisted pretreatment of refractory gold concentrate. Gold is considered to be refractory when it cannot be easily recovered by alkaline cyanide leaching. The vast majority of refractory gold occurs in sulphidic minerals such as

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Microbial Pretreatment of Refractory Gold Ore Xinhai

Mar 28, 2016· For coarse grain size of gold after crushing and grinding by flotation, gravity concentration, cyanide leaching process or several process combined treatment will be able to complete the separation of gold and gangue minerals, but there are some curing refractory gold ores due to coarse size or thin and gangue minerals symbiosis relations complex factors through the above

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US20090158893A1 Microbial pre-treatment of double

The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media. US20090158893A1 Microbial pre-treatment of double refractory gold ores Google Patents Microbial pre-treatment of double refractory gold ores Download PDF Info Publication number

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STUDY ON MICROWAVE PRETREATMENT OF REFRACTORY

By using the heating feature of microwave, it has shown from condition tests that the gold leaching recovery can be improved from 74% to more than 90% if the gold concentrates is treated for 5 minutes in a microwave oven at 450℃. Therefore, the gold leaching recovery of cyanide residue of more than 86% can be obtained in leaching plant. The results indicate that microwave pretreatment to

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Study on Pretreatment of Refractory Gold Ore by Microwave

Microwave roasting method was applied for the pretreatment of refractory gold ore (RGO). The occurrence,phase of gold and microstructure of roasted product were analyzed. The results showed that gold existed in tiny granular gold and sub-micro grain gold,the occurrence form of gold was mainly in gold-bearing sulfides and gold-bearing quartz. So pretreatment was required to break gold-bearing

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Potential pre-treatment and processing routes for recovery

2.1 Microwave pre- treatment of refractory gold ores . Most of refractory gold occurs within sulphide minerals such as FeS 2 and FeAsS and are treated by roasting, pressure leaching or bacterial leaching to render the gold amenable to recovery by subsequent treatment techniques (Haque, 1987).

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Optimizing the alkaline oxidation pretreatment of a

Sep 28, 2018· Microwave pretreatment: Biooxidation (BIOX) pre-treatment of refractory gold concentrates using mixotrophic and chemolithotrophic bacteria on the gold extraction during cyanidation indicated 91.4% gold could be extracted by mixotrophic bacteria for 14 days, and it was 18% higher than the extraction level of direct cyanidation of the

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COMPARISON OF CYANIDE AND THIOSULPHATE

Nanthakumar et al. (2007) tested microwave pretreatment with conventional roasting for a double refractory gold ore where both sulphides and carbonaceous matter were present. Roasting temperatures of 650˚C or over were required to convert the pyrite to hematite and

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Developments in the pretreatment of refractory gold

submicroscopic gold inclusions within sulphide minerals such as arsenopyrite and pyrite. Such ores require a pre-treatment process to alter or destroy the sulphide matrix and render the gold accessible to cyanide and oxygen (Gudyanga et al., 1999). The gold in high-sulphur and high-arsenic refractory gold concentrate (HGC) is encapsulated

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MICROBIAL PRE-TREATMENT OF DOUBLE REFRACTORY

The result of the novel microbial pre-treatment process indicated that sulfide sulfur was degraded under alkaline conditions and carbonaceous matter passivated by T. versicolor at its optimum growth conditions. This led to a significant improvement in gold extraction from the double refractory gold ore and concentrate investigated.

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Application Note Refractory Gold Pretreatment pH

Refractory Gold Pretreatment pH 2 Bacterial Oxidation Bacterial oxidation (Bio-oxidation) of refractory ores was first launched in the mid-1980's. Bio-oxidation uses bacteria of the Acidithiobacillus genus to metabolize sulfides, arsenic and iron into water soluable compounds. There are several patented bio-oxidation processes

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refractory ore gold and pretreatment 2020

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

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The mineralogical phase transformation of invisible gold

In this study, in order to obtain the maximum Au leaching rate, an invisible gold concentrate sample was microwave-treated and a thiourea leaching experiment was performed. It is found that gold exists as invisible as a result of observation with an optical microscope and an electron microscope. As the invisible gold concentrate sample was exposed to microwave longer, its temperature and

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US20090158893A1 Microbial pre-treatment of double

The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media. US20090158893A1 Microbial pre-treatment of double refractory gold ores Google Patents Microbial pre-treatment of double refractory gold ores Download PDF Info Publication number

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Improvement of Gold Leaching from a Refractory Gold

energy consumption. As a result, proper pretreatments are necessary to improve the leaching of gold from these refractory gold ores [5,6]. The pretreatment of oxidative roasting has always been one of the most extensively used methods in China attributing to its mature technique, high efficiency, energy conservation, etc. [7,8] Effective

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Ozone: Science & Engineering Pretreatment with Ozone for

Pretreatment with Ozone for Gold and Silver Recovery from Refractory Ores F. Nava-Alonso, E. Elorza-Rodrı´guez, A. Uribe-Salas, and R. Pe´rez-Garibay CNVESTAV Saltillo, Carretera Saltillo-Monterrey km 13, Ramos Arizpe, Coahuila, Me´xico In this work ozonization was studied as pretreatment for two Mexican refractory ores in order to increase

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Gold extraction Wikipedia

A "refractory" gold ore is an ore that has ultra fine gold particles disseminated throughout its gold occluded minerals. These ores are naturally resistant to recovery by standard cyanidation and carbon adsorption processes. These refractory ores require pre-treatment in order for cyanidation to be effective in recovery of the gold.