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  • Microwave pretreatment of a double refractory gold ore ...

    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

  • Cited by: 97
  • Microwave pretreatment of a double refractory gold ore

    After roasting refractory gold-bearing sulfur concentrates by microwave, the influences of microwave power, the ore mass and roasting time on sample mass loss rate and leaching rate were investigated.

  • MICROWAVE IRRADIATION PRETREATMENT OF A REFRACTORY

    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

  • Cited by: 16
  • 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 ...

  • 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).

  • Cited by: 97
  • 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 ...

  • 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.

  • Improved grindability and gold liberation by microwave ...

    The effect of microwave pretreatment on gold recovery by gravity concentration was studied by Amankwah et al. (2005) who showed a 12% increase in recovery after treatment in a multi-mode cavity ...

  • 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 ...

  • Cited by: 1
  • Microwave roasting of flash flotation concentrate ...

    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 et al (2009) applied microwave energy in a similar pretreatment of refractory gold ores and reported improvements in the subsequent gold

  • Author: R.K. Amankwah, G. Ofori-Sarpong
  • 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 ...

  • Ultrasound-intensified Leaching of Gold from a Refractory ...

    Request PDF Ultrasound-intensified Leaching of Gold from a Refractory Ore The effect of ultrasonic energy on the pretreatment and leaching of gold from the refractory ore was investigated.

  • 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,

  • Pretreatment Process on Refractory Gold Ores with As

    Kyuesi and Haque, etc. have studied the role of microwave in the gold extraction process of arsenic-bearing refractory gold ore. 8,9) Haque K E used microwave to dispose 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. The ore without ...

  • Gold Refractory Ores Microwave Assisted Recovery– Rock ...

    Gold Refractory Ores Microwave Assisted Recovery is a leading global manufacturer of crushing and milling equipment (Gold Refractory Ores Microwave Assisted Recovery), also supply individual (Gold Refractory Ores Microwave Assisted Recovery...) crushers and mills as

  • Refractory Gold Ore Treatment Methods

    Metallurgical ContentGold Leaching Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide, Sb2S2)Telluride Gold Ore ProcessingSolubility of TelluridesGold Extraction from Carbonaceous OreList Gold Refractory Process Methods Where gold is associated with arsenic, antimony, tellurium, and

  • Review Pretreatment Process on Refractory Gold Ores with As

    Pretreatment Process on Refractory Gold Ores with As Xin-yuan NAN, Xin CAI* and Jun KONG School of Electrical Engineering, Xinjiang University, 1230 Yan’an Road, Tianshan District, Urumqi, 830047 P. R. China. (Received on August 30, 2013; accepted on October 17, 2013) The problem of the refractory nature of gold bearing arsenide ores is ...

  • Pretreatment Of Refractory Gold Ore With Microwaves

    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 50%~89 19% with the solid microwave pretreatment, and the cyanide ...

  • 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.

  • 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.

  • Improved grindability and gold liberation by microwave ...

    Jul 18, 2013  In addition to the enhanced grindability, gold was released from the matrix of the host minerals at a coarser size, resulting in a significant increase in free gold recovery by gravity concentration. For a gold ore with a head grade of 6˙4 gt −1, the gold recovery improved from about 28% to 40% after microwave pretreatment.

  • 500 microwave pretreatment of a refractory gold

    assisted pretreatment of refractory gold concentrate, microwave assisted spent carbon regeneration, coke making and activated carbon production, and micro-wave assisted waste management, etc. [22-31]. For microwave processing of ilmenite, Itoh et al. described the microwave

  • Microwave pretreatment of a double refractory gold ore

    Microwave pretreatment of a double refractory gold ore. Microwave pretreatment of a double refractory gold ore:Sep 01 2007 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

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

    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 ...

  • 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.

  • Improved grindability and gold liberation by microwave ...

    Jul 18, 2013  In addition to the enhanced grindability, gold was released from the matrix of the host minerals at a coarser size, resulting in a significant increase in free gold recovery by gravity concentration. For a gold ore with a head grade of 6˙4 gt −1, the gold recovery improved from about 28% to 40% after microwave pretreatment.

  • 500 microwave pretreatment of a refractory gold

    assisted pretreatment of refractory gold concentrate, microwave assisted spent carbon regeneration, coke making and activated carbon production, and micro-wave assisted waste management, etc. [22-31]. For microwave processing of ilmenite, Itoh et al. described the microwave

  • Microwave pretreatment of a double refractory gold ore

    Microwave pretreatment of a double refractory gold ore. Microwave pretreatment of a double refractory gold ore:Sep 01 2007 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

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

    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 ...

  • 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

  • Experimental Study on Extraction of Vanadium from Stone ...

    The microwave is the electromagnetic radiation with the frequency in the between 300 MHz~300GHz. The microwave technology in metallurgy application research are mainly in heating, drying, oxide reduction, mineral processing such as the pretreatment of refractory gold and waste treatment, and metal recovery. The stone coal vanadium ore grinded was dealt with the microwave pretreatment in

  • pretreatment of refractory gold ore with microwaves

    pretreatment process on refractory gold ores with as j stage. keywords: arsenic bearing gold ore pretreatment process refractory gold ore .. haque k e used microwave to dispose of arsenical pyrite and gold concentrate. study on pretreatment of refractory gold ore by microwave roasting . microwave roasting method was applied for the pretreatment ...

  • 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

  • microwaving refractory gold ore

    Microwave pretreatment of a double refractory gold ore, Microwave pretreatment of a double refractory gold ore Microwave pretreatment of a double refractory gold ore Nanthakumar, B.; Pickles, C.A.; Kelebek, S. 01 00:00:00 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 ...

  • pretreatment of refractory gold ore with microwaves

    microwave for refractory gold . microwave pretreatment of a refractory goldcad-house.co.za. microwave assisted refractory gold processing manufacturer in Shanghai, China microwave assisted refractory gold processing is manufactured from Shanghai ,It is the

  • Optimizing the alkaline oxidation pretreatment of a ...

    This study investigates the alkaline oxidation pretreatment process of Zarshuran refractory gold ore. Taguchi method-orthogonal array design (OAD) is applied to evaluate and optimize the influence of five main factors including solution pH, aeration rate, agitation speed, temperature, and oxidation time.

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

    2. K. E. Haque, “Microwave irradiation pretreatment of a refractory gold concentrate,” in: Proceedings of International Symposium on Gold Metallurgy, Winnipeg (1987).

  • 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.

  • 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

  • pretreatment of refractory gold ore with microwaves

    microwave for refractory gold . microwave pretreatment of a refractory goldcad-house.co.za. microwave assisted refractory gold processing manufacturer in Shanghai, China microwave assisted refractory gold processing is manufactured from Shanghai ,It is the

  • Optimizing the alkaline oxidation pretreatment of a ...

    This study investigates the alkaline oxidation pretreatment process of Zarshuran refractory gold ore. Taguchi method-orthogonal array design (OAD) is applied to evaluate and optimize the influence of five main factors including solution pH, aeration rate, agitation speed, temperature, and oxidation time.

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

    2. K. E. Haque, “Microwave irradiation pretreatment of a refractory gold concentrate,” in: Proceedings of International Symposium on Gold Metallurgy, Winnipeg (1987).

  • pretreatment of refractory gold ore

    Microwave pretreatment of a double refractory gold ore ... 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%.

  • LEACHING OF REFRACTORY GOLD ORES BY MICROWAVE

    To make efficient use of microwave irradiation, we attempted to examine the effect of microwave leaching on the leachability of refractory gold ores compared to traditional leaching. We systematically examined how the indices that characterize the leaching of gold ores are affected by such test parameters as microwave power, the duration of ...

  • Microwave assisted roasting for enhanced processing of ...

    refractory gold ores can yield low rates, so they require implementation of extra stages, such as roasting, in order to eliminate the compounds that cause the refractoriness (e.g. sulfur-based compounds or carbon,), or grinding, in order to free smaller particles of gold that are trapped inside other elements or inside the gangue.

  • 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

  • Pressure Oxidation Pretreatment of Refractory Gold ...

    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.

  • 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.

  • 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.

  • The application of ultrasound technology in the field of ...

    In recent years, ultrasonic technology has been applied and developed in the field of precious metal. The paper reviews the progress of ultrasonic technology applied in minerals processing, materials preparation, precious metal plating, secondary materials recycling and analytical chemistry. Ultrasonic technology in the field of precious metals is superior to traditional techniques.

  • Gold mineral processing - Hatch Ltd

    Refractory gold ore pretreatment Treatment of refractory gold ore (whole ore and flotation concentrates) has become more prominent since the 1980s, with many gold discoveries often including ores that are wholly or partially refractory. Refractory pre-treatment processes include pressure oxidation, biological oxidation and various forms of ...

  • 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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    The materials of processing: *

    • Granite
    • Limestone
    • Basalt
    • Pebble
    • Gravel
    • Gypsum
    • Marble
    • Barite
    • Quartz
    • Dolomite
    • Gold Ore
    • Copper ore
    * *

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