8302 Microwave Pretreatment Of A Refractory Gold

  • www.researchgate.net

    Abstract 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 microwaves with...

    Get Price
  • Improving impregnation and penetration properties of ...

    Therefore, pretreatment of wood with liquid nitrogen (LN) could be a promising technique in this field and would apply a different method. Obtaining deeper penetration in refractory wood species will result in an improvement in the impregnation and drying process. EXPERIMENTAL. Materials. Vital problems can occur during the wood protection process.

    Get Price
  • A new pretreatment technology of refractory gold ore ...

    A new pretreatment technology of refractry gold ore-mincrowave roast is introduced.Its principle and research situation in the country and oversea are described. Through comparisons with other pretreatment methods, the advantages of microwave roast are exhibited evidently Problems need to be solved at present are brought forward.

    Get Price
  • 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 ...

    Get Price
  • US4923510A - Treatment of refractory carbonaceous sulfide ...

    Refractory carbonaceous sulfide ores are treated in a manner so as to improve gold recovery by a treatment in specific combination of steps whereby the ore is treated with chlorine after pretreatment and before cyanidation; the particular steps in the treatment of the ore have been found to be necessary as the conventional pretreatment will not improve the yields on any …

    Get Price
  • Microwave-assisted leaching—a review | M. Al-Harahsheh; S ...

    You can write a book review and share your experiences. Other readers will always be interested in your opinion of the books you've read. Whether you've loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them.

    Get Price
  • Applications of microwave heating

    Bradhurst and Worner, 1990 discuss applications of microwave heating in mineral processing and pyromet-allurgy, including drying of coal, gold extraction and ore reduction (see also Standish and Huang, 1991 and Standish and Worner, 1991). Haque, 1987 has discussed microwave pre-treatment of refractory gold ores.

    Get Price
  • 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 …

    Get Price
  • refractory ore gold and pretreatment 2012

    refractory ore gold and pretreatment 2012 microwave pretreatment of a refractory gold pre coal mining in balikpapannext yoyo factory grind machine 2... Pressure Oxidation Refractory Gold …

    Get Price
  • IMPROVED ROASTING OF SOME COLOMBIAN GOLD ORES

    2.4. Traditional Gold Recovery The recovery rate of refractory gold ores, through traditional means, can be improved with a prior roasting of the mineral sample. This requires a temperature around 700°C, and constant oxygenation, so the sulfur-based compounds are able to transform into oxides.

    Get Price
  • Pretreatment of arsenic-bearing gold ore with microwave ...

    Jun 01, 2016· Pretreatment of arsenic-bearing gold ore with microwave-assisted alkaline leaching Pretreatment of arsenic-bearing gold ore with microwave-assisted alkaline leaching Ma, Hongzhou; Yan, Chao; Wang, Yaoning 2016-06-01 00:00:00 In this paper, the removal of arsenic from arsenic-bearing gold ore through air oxidation and sodium hydroxide leaching with microwave irradiation was …

    Get Price
  • Pretreatment of arsenic-bearing gold ore with microwave ...

    Jun 01, 2016· Pretreatment of arsenic-bearing gold ore with microwave-assisted alkaline leaching Pretreatment of arsenic-bearing gold ore with microwave-assisted alkaline leaching Ma, Hongzhou; Yan, Chao; Wang, Yaoning 2016-06-01 00:00:00 In this paper, the removal of arsenic from arsenic-bearing gold ore through air oxidation and sodium hydroxide leaching with microwave …

    Get Price
  • refractory ore gold and pretreatment 2012 in laos

    Refractory Ore Gold And Pretreatment 2012 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...As a leading global manufacturer of crushing equipment, …

    Get Price
  • 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.

    Get Price
  • Pretreatment of arsenic-bearing gold ore with microwave ...

    Jun 01, 2016· Pretreatment of arsenic-bearing gold ore with microwave-assisted alkaline leaching 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.

    Get Price
  • Pretreatment Process on Refractory Gold Ores with As

    Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding. 1) Arsenic-bearing refractory gold ore has stones extremely difficult to deal with. In the stones, gold is locked up in arsenic mineral matrix as the form of microscopic or submicroscopic lattice.

    Get Price
  • Experimental investigation of recovering gold from ...

    Corpus ID: 113016029. Experimental investigation of recovering gold from maghemite-rich magnetic concentrates by roasting @inproceedings{Fosu2016ExperimentalIO, title={Experimental investigation of recovering gold from maghemite-rich magnetic concentrates by roasting}, author={Bernard Fosu}, year={2016} }

    Get Price
  • US5824133A - Microwave treatment of metal bearing ores and ...

    US5824133A US08/614,352 US61435296A US5824133A US 5824133 A US5824133 A US 5824133A US 61435296 A US61435296 A US 61435296A US 5824133 A US5824133 A US 5824133A Authority US United States Prior art keywords cavity ore concentrate microwave energy Prior art date 1996-03-12 Legal status (The legal status is an assumption and is not a …

    Get Price
  • Increasing leaching rate of gold cyanide of two-stage ...

    For the gold locked within hematite in the two-stage calcination, which leads to a low gold leaching rate, the present work is aiming at pretreating the calcination to selectively dissolve hematite. The calcination was pretreated by sulfuric acid with cosolvent B. The factors influencing the hematite dissolution rate were studied, and the pretreatment parameters considered were H2SO4 content ...

    Get Price
  • 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 …

    Get Price
  • Microwave Heating Applications in Mineral Processing ...

    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 pyrite (FeS 2), arsenopyrite (FeAsS) and pyrrhotite (FeS).

    Get Price
  • Extraction of Indium from Zinc Oxide Flue Dust by ...

    B. Nanthakumar, C.A. Pickles and S. Kelebek, “Microwave pretreatment of a double refractory gold ore,” Minerals Engineering, 20 (11) (2007), 1109–1119. CrossRef Google Scholar 11.

    Get Price
  • 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 …

    Get Price
  • 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 …

    Get Price
  • Monday November 10

    09.00 Microwave pretreatment of a carbonaceous sulfidic gold concentrate R.K. Amankwah (University of Mines and Technology, Ghana) and C.A. Pickles (Queen’s University, Canada) 09.30 A combined modelling of microwave irradiation pretreatment and peroxyacetic acid desulfurization of coal using artificial neural network

    Get Price
  • Increasing leaching rate of gold cyanide of two-stage ...

    For the gold locked within hematite in the two-stage calcination, which leads to a low gold leaching rate, the present work is aiming at pretreating the calcination to selectively dissolve hematite. The calcination was pretreated by sulfuric acid with cosolvent B. The factors influencing the hematite dissolution rate were studied, and the pretreatment parameters considered were …

    Get Price
  • Microwave Heating Applications in Mineral Processing ...

    Amankwah et al., 2005 35, performed tests on samples of a gold ore containing quartz, silicates and iron oxides with a head grade of 6.4 g/t of gold, using 2 kW of power in a multimode cavity. It was seen that the microwave treatment resulted in a maximum reduction of 31.2% in crushing strength and a reduction of 18.5% in work index.

    Get Price
  • Study on dearsenification of gold concentrate by microwave ...

    Refractory gold ore refers to the ore with low gold leaching rate and high cyanide consumption when arsenic ore is extracted by conventional cyanidation method. With the development and utilization of a large number of gold resources, conventional gold ores that …

    Get Price
  • Study on dearsenification of gold concentrate by microwave ...

    Refractory gold ore refers to the ore with low gold leaching rate and high cyanide consumption when arsenic ore is extracted by conventional cyanidation method. With the development and utilization of a large number of gold resources, conventional gold ores that are easy to be prepared are becomingless and less, and

    Get Price
  • Applications of microwave oven sample dissolution in ...

    Microwave digestion techniques in the sequential extraction of calcium, iron, chromium, manganese, lead, and zinc in sediments. ... Pretreatment by yeast for determination of nickel and vanadium in bitumen-in-water emulsion by inductively coupled plasma atomic emission spectrometry. ... MICROWAVE IRRADIATION PRETREATMENT OF A REFRACTORY GOLD ...

    Get Price