microwave pretreatment of a refractory gold
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microwave pretreatment of a refractory gold

MICROWAVE IRRADIATION PRETREATMENT OF A REFRACTORY

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

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.

Microwave pretreatment of a double refractory gold ore ...

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. The compositional changes of the ore during roasting were determined by thermogravimetric analysis (TGA).

Microwave pretreatment of a double refractory gold ore ...

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 ...

Study on microwave pretreatment of refractory ...

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.

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 ...

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 ...

pretreatment of refractory gold ore with microwaves

Microwave pretreatment of a double refractory gold 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 ...

refractory gold pretreatmentbing

microwave pretreatment of a refractory gold. microwave pretreatment of a refractory gold Know More refractory gold ore milling in oregon atithipalacein, microwave pretreatment of a double refracto. Inquire Now; Pre-treatment of a refractory gold sulfide ore by means

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 ...

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

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).

Pretreatment of a refractory arsenopyritic gold ore using ...

Mar 01, 2015 · An arsenopyrite refractory ore was pretreated with NaOH to increase gold extraction. After pretreatment, gold and silver were leached with copper ammonium thiosulfate solution. Thiosulfate leaching of the as-received ore extracted only 21% and 29% of silver and gold, respectively. Up to 81% of the gold and 50% of the silver were recovered after ...

Leaching of Refractory Gold Ores by Microwave Irradiation ...

Dec 10, 2013 · The present paper attempts to assess the effects of microwave irradiation on the leachability of refractory gold ores. Characteristics of the crystal structure and microstructure of the ores were determined by x-ray structural analysis (XRD) and scanning electron microscopy (SEM) before and after microwave irradiation. Compared to conventional processes, microwave leaching processes

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 ...

Refractory Gold Ore Treatment Methods

Jul 14, 2016 · At the plant of the Consolidated Murchison Co. in the Transvaal, South Africa, where a refractory high-antimony gold ore is being treated, flotation and cyanidation of the flotation concentrates and tailings are being practiced. The association of the antimony and gold is very intimate, and during 1946, while the antimony recovery amounted to ...

(PDF) Bacterial Leaching as a Pre-treatment Step for Gold ...

It is necessary to apply a pretreatment to obtain high gold recovery (>80%) from such refractory ores by cyanide leaching. There have been many studies on the oxidation of refractory gold ores for ...

high pressure oxidation of refractory gold minerals

Developments in the pretreatment of refractory gold. The high-pressure nitric acid oxidation process is shown in Figure 1. LI, D.-X. Developments on the pretreatment of refractory gold minerals by nitric acid. World Gold Conference 2009,The Southern African Institute of Mining and Metallurgy, 2009.

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 ...

Microwave Heating Applications in Mineral Processing ...

Dec 10, 2011 · Currently, EMR Microwave Technology, Fredericton, N.B., Canada is conducting pilot-scale microwave pretreatment tests on various kinds of refractory gold concentrates, ores and tailing. Al-Harahsheh et al., 2005 54 , have investigated the leaching kinetics of chalcopyrite under the influence of microwave treatment.

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 ...

Rock Crushing Using Microwave Pretreatment

Microwave pretreatment of refractory gold ores . the microwave pretreatment processes of refractory gold ores in solid and slurry, and effects of the microwave pretreatment on cyanide leaching are investigated the mechanism of microwave pretreatment is described the cyanide leaching recovery of au in the sample a is up to 86 5089 19 with the ...

Model of process of microwave action on refractory gold ...

1. A number of different methods have been used to study the material composition and particle size distribution of a gravity concentrate.2. Several different processing regimes have been tested in the treatment of the gravity concentrate in a microwave field. It has been established that a processing scheme consisting of calcination followed by cyaniding gives a 94.8% recovery of gold from ...

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.

Pretreatment of arsenic-bearing gold ore with microwave ...

Abstract In this paper, the removal of arsenic from arsenic-bearing gold ore through air oxidation and sodium hydroxide leaching with microwave irradiation was studied. Firstly, single-factor experiments were carried out. The results indicated that the removal rate of arsenic was influenced by the sodium hydroxide concentration, ratio of liquid to solid, microwave power, and reaction time.

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.

Effect of microwave pretreatment on the liberation ...

May 01, 2004 · The influence of microwave radiation on the liberation of the valuable minerals in a massive sulfide ore is presented. In general, sphalerite shows the highest degree of liberation with a maximum value of 84%. Sphalerite is followed by galena with 73% liberation and chalcopyrite with 63% liberation. A fine feed size and a high microwave power are the two common requirements for the

high pressure oxidation of refractory gold minerals

Developments in the pretreatment of refractory gold. The high-pressure nitric acid oxidation process is shown in Figure 1. LI, D.-X. Developments on the pretreatment of refractory gold minerals by nitric acid. World Gold Conference 2009,The Southern African Institute of Mining and Metallurgy, 2009.

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.

Increasing leaching rate of gold cyanide of two-stage ...

Apr 03, 2015 · Nanthakumar B, Pickles CA, Kelebek S. Microwave pretreatment of a double refractory gold ore. Miner Eng. 2007;20(11):1109. Article Google Scholar [5] Gudyanga FP, Mahlangu T, Roman RJ, Mungoshi J, Mbeve K. An acidic pressure oxidation pretreatment of refractory gold concentrates from the KweKwe Roasting Plant.

The Use Of Microwave In Refractory Ore Benification

microwave pretreatment of a refractory gold jelly crusher ... microwave pretreatment of a double refractory gold ore autoclaveing process for refractory ore. ... Refractory Gold Ores and the Eco Refractory ... microwave assisted ... Read more. bauxite found in hard or soft rock in haiti.

The Application and Advantages of Microwave Heating

Jul 21, 2017 · In the late 1980s, microwave can be used in the pretreatment of refractory gold deposits, the recovery of gold from low-grade ores and tailings, the extraction of

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.

(PDF) Microwave-assisted leaching—a review | Mohammad Al ...

It was indicated that microwave energy The main types of dielectric polarization are (Metaxas could have a potential application in comminution, and Meredith, 1983): drying, pre-treatment of refractory gold ores, coal desulphurisation, leaching, roasting, carbon reactiva- electron polarization due to the change of electron tion, carbothermic ...

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