pretreatment of refractory gold ore with microwaves

Pretreatment of arsenic

Jun 01 2016 0183 32 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...

Leaching of Refractory Gold Ores by Microwave Irradiation

Dec 10 2013 0183 32 The present paper attempts to assess the effects of microwave irradiation on the leachability of refractory gold or 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...

Pretreatment Process on Refractory Gold Ores with As

Microwave energy was applied in the pretreatment of a typical refractory arsenopyritic gold concentrate More than 80 of As and S were volatilized off...

Numerical modeling microwave roasting of refractory gold ore

The mathematical model was applied to two types of refractory gold ores viz carbonaceous and sulfidic gold or The model was tested for three different power levels of 133 298 and 531 kW/sqm The temperatures predicted by the model and the transient temperature plots which enable control of temperature are presented here...

Study on Pretreatment of Refractory Gold Ore by Microwave

Sep 01 2007 0183 32 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 or...

A new pretreatment technology of refractory gold ore

A new pretreatment technology of refractry gold ore-mincrowave roast is introducedIts 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...

Study on microwave pretreatment of refractory

Download Citation Study on microwave pretreatment of refractory microdimensional gold packaged by pyrite in gold ores By using the heating feature of microwave it has shown from condition...

US5824133A

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 legal conclusion...

Chemical and biooxidation as pretreatment of arsenical

This research aims to investigate the combination of atmospheric oxidation and bio-oxidation as pretreatment of arsenic-bearing refractory gold or The originality of this research is to develop biomarkers as performance indicators that link microbial functions and the environmental conditions such as arsenic concentration This information will be used to guide implementation of measures...

Effect of Pretreatment of Sulfide Refractory Concentrate

Keywords Refractory Gold Concentrate Hypochlorite Ox idation Pretreatment Pressure Cyanidation 1 Introduction 11 Background Many of the gold deposits contain finely disseminated gold in iron sulfide minerals such as pyrite and arsenopy- rite Such deposits are called refractory gold ores due to...

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...

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...

Study on pretreatment of refractory gold ore by microwave

Download Citation Study on pretreatment of refractory gold ore by microwave roasting method Microwave roasting method was applied for the pretreatment of refractory gold ore RGO The...

Microbial Pretreatment of Refractory Gold Ore

Part of refractory gold ores of gold particles with fine gold or submicroscopic gold a parcel or disseminated exist in sulfide ore and the sulfide is usually pyrite arsenopyrite pyrrhotite even in some mineral deposits most of the gold can enter the crystal lattice of pyrite arsenopyrite in the state of super micro gold Even if the ore...

Microwave roasting of flash flotation concentrate

Jun 01 2020 0183 32 Nanthakumar et al 2007 investigated the use of microwave energy in pretreating a double refractory gold ore containing 156 sulphur and 596 total carbon Wei et al 2009 applied microwave energy in a similar pretreatment of refractory gold ores and reported improvements in the subsequent gold extraction...

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...

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 50 89 19 with the solid microwave pretreatment and the cyanide leaching recovery of Au in sample B...

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...

Extraction of Gold from a Low

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 1175 Hence a pretreatment was necessary In this paper a flotation-preoxidation-cyanide leaching process was developed...

The Use Of Microwave In Refractory Ore Benification

equipment to leach gold ore using microwaves - BINQ Mining Method for pretreating refractory gold ore by employing microwave The invention relates to a method to pre-treat a hard-to-leach gold ores...

Microwave Heating Applications in Mineral Processing

Dec 10 2011 0183 32 Currently EMR Microwave Technology Fredericton NB 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...

MICROWAVE IRRADIATION PRETREATMENT OF A REFRACTORY GOLD

ABSTRACT 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...

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...

microwave pretreatment of a refractory gold philippines

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...

PAPER OPEN ACCESS Biooxidation pretreatment of low

Hence this refractory gold ore in its processing requires pretreatment methods before cyanidation Some conventional pretreatment methods such as the pre-aeration method by chlorination roasting pressure oxidation ultrafine grinding and flotation-intensive leaching are proven to be less suitable to process refractory-type gold ores...

Recovery Refractory Resources

most common pre-treatment options and speaks to some companies that offer or use the processes A refractory gold ore is gold-containing ore that is resistant to recovery by direct cyanidation and carbon adsorption process More specifically it is an ore that has a gold recovery rate of less than 80 when direct cyanidation is applied to it...

pretreatment of refractory gold ore quarry process in

01/09/2007 In this paper microwave pretreatment of a double refractory gold ore was investigated as an alternative method and the results are compared to conventional roasting 3 Experimental 31 Ore sample A low-grade sample of a double refractory gold ore was obtained from Barrick Gold Strike...

GOLD RECOVERY OF REFRACTORY SULFIDE CONCENTRATES

hydrometallurgical pre-treatment process has given more option for treating refractory or Keywords refractory gold ore leaching cyanide nitrite oxidant ABSTRAK Permasalahan bijih emas refraktori sulfidis yang mempunyai peroleh emas lebih kecil dari 50 bila diolah dengan proses sianidasi langsung masih terjadi hingga saat ini...

Pretreatment Process on Refractory Gold Ores with As

1 Introduction 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...

Experimental Study on Microwave Pretreatment with some

Microwave radiation was employed as a pretreating technology to oxidise a refractory gold ore Heating characteristics showed that in an identical microwave field the bulk temperature of the...

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