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microwave pretreatment of a refractory gold

Microwave pretreatment of a double refractory gold ore ...

2007-9-1  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 IRRADIATION PRETREATMENT OF A

1987-1-1  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

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Microwave pretreatment of a double refractory gold ore ...

2007-9-1  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

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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).

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Microwave pretreatment of a double refractory gold ore

Nanthakumar et al. (2007) investigated the use of microwave energy in pretreating a double refractory gold ore containing 1.56% sulphur and 5.96% total carbon. Wei

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pretreatment of refractory gold ore with microwaves

Microwave pretreatment of a double refractory gold. 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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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

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Microwave roasting of a carbonaceous sulphidic gold ...

2009-10-1  Microwave roasting could find application in the minerals industry as a pretreatment method for refractory gold concentrates. Many processing plants, where refractory gold ores are treated, incorporate a flash flotation system where coarse flotation is done and the flash concentrate is milled further in a regrind circuit.

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Removal of arsenic and sulfur from a refractory gold ...

2010-1-1  Prior investigation by the authors on the microwave pretreatment of a typically primary refractory gold flotation concentrate 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 irradiation time . This implies that the ...

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Refractory Gold Ore Treatment Methods

2016-7-14  Metallurgical ContentGold Leaching Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide, Sb2S2)Telluride Gold Ore

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pretreatment of refractory gold ore with microwaves

Microwave pretreatment of a double refractory gold. 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.

More

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

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Review Pretreatment Process on Refractory Gold Ores

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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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

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Pretreatments Applied to Refractory Gold Ores Request

It is necessary to apply a pretreatment process to obtain high gold recoveries (> 80 percent) from refractory ores by cyanide leaching. Many studies have been conducted on the oxidation of ...

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An application of microwave pre-oxidation in improving ...

2021-12-28  Request PDF An application of microwave pre-oxidation in improving gold recovery of a refractory gold ore Microwave radiation was employed as

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Mineralogy and Pretreatment of a Refractory Gold Deposit ...

2019-7-1  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). The results showed that gold was highly dispersed in gold-bearing minerals such as pyrite, arsenopyrite, and some gangues in

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Refractory Gold Ore Treatment Methods

2016-7-14  Metallurgical ContentGold Leaching Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide, Sb2S2)Telluride Gold Ore

More

Mineralogy and Pretreatment of a Refractory Gold Deposit ...

2019-7-1  The best pretreatment process is ultimately determined by the geological formation process and mineralogy of the gold deposit [10,11,12,13].In general, liberated native gold is recovered by low cost gravity separation, especially for coarse gold [14,15].Common gravity separation equipment includes shaking table, spiral chute, and jigging concentrator.

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COMPARISON OF CYANIDE AND THIOSULPHATE

2016-3-20  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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pretreatment of refractory gold ore with microwaves

Microwave pretreatment of a double refractory gold. 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.

More

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

More

Microwave Pretreatment for Thiourea Leaching for Gold ...

2017-10-1  Abstract and Figures. In this research, we studied the use of microwave pretreatment to enhance the efficiency of Au leaching from gold concentrate. The gold concentrate was pretreated using ...

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Leaching of Refractory Gold Ores by Microwave Irradiation ...

2013-12-10  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,

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Leaching of Refractory Gold Ores by Microwave Irradiation ...

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 ...

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Mineralogy and Pretreatment of a Refractory Gold Deposit ...

2019-7-1  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). The results showed that gold was highly dispersed in gold-bearing minerals such as pyrite, arsenopyrite, and some gangues in

More

Mineralogy and Pretreatment of a Refractory Gold Deposit ...

2019-7-1  The best pretreatment process is ultimately determined by the geological formation process and mineralogy of the gold deposit [10,11,12,13].In general, liberated native gold is recovered by low cost gravity separation, especially for coarse gold [14,15].Common gravity separation equipment includes shaking table, spiral chute, and jigging concentrator.

More

COMPARISON OF CYANIDE AND THIOSULPHATE

2016-3-20  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

More

Ultrasound-intensified Leaching of Gold from a

refractory gold ore. The high Au extractions after ultrasound pretreatment confirmed that a large proportion of the gold was refractory in nature because of their unliberatied (i.e. locked) inclusions. 3.1.2. Effect of the NaOH Concentration The effect of the NaOH concentration was studied when the ultrasound pretreatment time is 3 h. The ...

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Experimental investigation of recovering gold from ...

Microwave pretreatment of a double refractory gold ore. B. Nanthakumar, C. Pickles, Ş. Kelebek; Chemistry; 2007; 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. ...

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