Refractory Gold Ore And Pretreatment

Refractory Gold Ore And Pretreatment

Biooxidation‒thiosulfate leaching of refractory gold concentrate USTB

A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated Mineralogical studies on the concentrate showed that very fine gold grains <10 μm were encapsulated in pyrite and arsenopyrite while the proportion of monomer gold was only 21% The gold bearing sample was identified as a high sulfur fine sized wrapped type refractory gold

Method for Pre Treatment of Gold Bearing Oxide Ores

Thiosulfate gold extraction from some oxide ores can be minimal As oxide ores do not contain sulfides or have very low levels of sulfide the refractory nature cannot be mitigated in the same manner as for sulfide ores by roasting bio oxidation or pressure oxidation

Carbon in Leach Gold Recovery from Fungi treated Carbonaceous Ore

The surrogate CGO was prepared by adding 3% anthracite grade CM to free milling gold ore FGO The main minerals in the FGO were quartz feldspar and sericite with g/t gold % sulphide sulphur and % organic carbon and sustainability of the enzyme activity during pretreatment to enhance the overall gold recovery

Gold Recovery of Refractory Sulfide Concentrates Using Direct Esdm

reagent on cyanidation of refractory gold ore Cyanide leaching of the concentrate was performed at 20% w/w of solid 500 gram of refractory sulfide gold ore concentrate in a liter glass reactor with aeration and stirred at 250 rpm Leach solutions were prepared using deionized distilled water at the prescribed concentration of reagents

Characterization of refractory behaviour of complex gold/silver ore by

of such an ore and for the identification of possible pretreatment options to overcome its refractoriness prior to cyanide leaching Key words gold and silver ores refractoriness characterization diagnostic leach 1 Introduction Generally gold ores can be classified as free milling and refractory depending on their response to

NIOSHTIC 2 Publications Search 10010831 Carbon in chlorine

The Bureau of Mines is investigating the treatment of refractory gold ores Chlorination in the treatment of refractory gold ores is applicable in many low grade gold operations When usable this treatment provides an economic means of consuming sulfides and deactivating disseminated organic carbon Chlorination however is a pretreatment technique that requires the neutralization of the

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

Richard Osei LinkedIn

The challenges posed by refractory gold ores during cyanidation have generated research interest in microbial mineral pre treatment techniques to improve extraction from such hard to treat ores

Refractory gold ores Challenges and opportunities for a key source of

Mar 23 2021This special treatment is required for two reasons first to liberate gold particles encapsulated in sulfide or arsenic minerals and second to eliminate carbonaceous material occurring in the ore which adsorbs dissolved gold instead of active carbon that is normally added to the leaching solution Exhibit 1

Gold Leaching from Refractory Ores—Literature Survey

This review is essentially an overview of the pretreatment processes for the refractory gold ores available in the recent literature When gold is finely disseminated in sulphides arsenosulphides tellurides carbonaceous and clayey materials direct alkaline cyanidation is not effective for gold extraction

Refractory Gold with the MACH REACTOR GoldOre

A refractory gold ore is an ore that has ultra fine gold particles disseminated throughout its gold occluded minerals These ores are naturally resistant to recovery by standard cyanidation and carbon adsorption processes These refractory ores require pre treatment in order for cyanidation to be effective in recovery of the gold

processing Gold ore Rodger Allen Gold Mine SlideShare

1 Processing Gold Ores By Rodger Allen Gold Mine 2 Gold ore processing Ore Preparation • Gold liberation • Particle size adjustment to next processes • Physical concentration and oxidation pretreatment Gold Extraction • Extraction of gold from ore into solution and/or concentrate Gold Purification • Purification of gold bearing

Application of The Biox Process to The Pretreatment of Refractory

process as a pretreatment procedure of refractory sulphide gold ores and concentrates Au and Ag recovery yields after cyanidation increased up to 78 % for Au and to 83 % for Ag Keywords BIOX Au Ag recovery gold ore 1 Introduction BIOX is a biohydrometallurgical process for the pre cyanidation treatment of refractory gold ores This process

Simultaneous Biotransformation of Carbonaceous Matter and Sulfides in

Double refractory gold ores DRGO contain metal sulfides that encapsulate gold and prevent its dissolution by cyanide and carbonaceous matter CM that adsorbs gold cyanide complex Pretreatment is therefore required to decompose the sulfides and liberate gold before cyanidation and Relevance of microbial pretreatment of double

Development of a Heap Biooxidation Process for the Lahoca Refractory

The results are presented herein of on going laboratory investigations of heap bacterial oxidation as a pretreatment method for the recovery of sulfide encapsulated gold from ore samples of the Rhodes Mining Lahoca deposit located in northern Hungary The ore contains just over 2 g Ault and as much as 6% sulfide mostly as pyrite

Application Note Refractory Gold Pretreatment pH Barben Analytical

Roasting of refractory ore has historically been the method to remove sulfur up until the 1980s The roasting process oxidizes the sulfur by converting it to gaseous sulfur dioxide SO 2 Ore is ground to 100 200μm mesh and heated between 450ºC 700ºC in a ﬂ uidized bed With proper retention time >90% of the suﬂ ur can be converted

Refrakter Altin Cevherleri̇çi̇n Tanimlayici Çözündürme Tekni̇ği̇ni̇n Uygulanmasi

However refractory gold ores are often characterized by the low gold extractions <50 80% in cyanide leaching The refractoriness of gold ores and concentrates stems primarily from the inherent as a pretreatment step before cyanidation was shown to improve the recovery of gold only to 80 % [22] Similarly Celep et al 2024 noted only a

Mineralogy and Pretreatment of a Refractory Gold Deposit in Zambia MDPI

The grade and recovery of gold in the flotation concentrates were g/t and % respectively The total recovery of gold was % The gravity flotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of gold

Recovery Refractory Resources SGS

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 processes More specifically it is an ore that has a gold recovery rate of less than 80% when direct cyanidation is applied to it

The Development of Pretreatment Technology of Carbonaceous Gold Ore

Abstract Pretreatment is an effective method to improve the quality and recovery rate of gold concentrate With the increasing proportions of refractory carbonaceous gold ore it is difficult to obtain a higher gold leaching rate by the conventional pretreatment methods such as roasting oxidation covering inhibition and competitive adsorption

Developments in the pretreatment of refractory gold minerals by nitric acid

DEVELOPMENTS IN THE PRETREATMENT OF REFRACTORY GOLD MINERALS BY NITRIC ACID 147 The NO produced from this process is used to prepare nitric acid and a little of the NO is oxidized to NO 2 The mixture of NO and NO 2is absorbed into lime and becomes Ca NO 3 2 When this returns to the reactor it reacts with H 2SO 4and become HNO

Recovering refractory resources Mining Magazine

Recovering refractory resources Refractory gold ore needs pre treatment for cyanidation to be effective in gold recovery Ailbhe Goodbody looks at the advantages and disadvantages of the most common pre treatment options and speaks to some companies that offer or use the processes Archive > Management 28 August 2024

Optimizing the alkaline oxidation pretreatment of a refractory gold ore

Ammonia and sodium chloride were used for alkaline oxidation pretreatment of refractory gold ore before cyanide leaching Ca OH 2 was used as a pH modifier to maintain the pH at the targeted value during oxidation and leaching Sodium cyanide was also applied as a leaching agent Methods

Complete process and equipment solutions for refractory gold treatment

Sep 17 2021Selecting the preferred process for the treatment of a refractory gold ore or concentrate involves a number of aspects including the metallurgical and mineralogical characteristics of the ore any impurities the size and location of the project local conditions and regulations and utility requirements all three pretreatment technologies

The problems caused by iron sulphate presence in treating refractory

A section of the article on gold recovery techniques in the May issue of the magazine had to be cut due to space constraints It covered the paper Basic iron sulphate a potential killer for pressure oxidation processing of refractory gold concentrates if not handled properly presented at this year s SME annual meeting by Chris Fleming of SGS He suggests investigating the use of a

Biooxidation Pretreatment of Refractory Sulfidic and Sulfidic

Bacterial oxidation of refractory sulfidic gold ores and concentrates can be used as a pretreatment process to enhance the recovery of gold Sulfide minerals that occlude gold such as pyrite arsenopyrite pyrrhotite and marcasite are biooxidized by acidophilic chemolithotrophic bacteria

Bio Oxidation of a Double Refractory Gold Ore and Investigation of Preg

Currently refractory gold ores account for around one third of the total gold production of natural ores and their refractory behavior is mainly due to the fact that the ﬁne gold particles are often encased in sulﬁde matrices such as pyrite and arsenopyrite or the leached gold are preg robbed by carbonaceous matters CM [2 4] In some

Pressure Oxidation Pretreatment of Refractory Gold SpringerLink

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

Heap leaching of refractory gold ore by integrating enhanced bio

Gold occurs in association with pyrite and arsenopyrite in the Carlin type gold deposit with little gold being contained in carbonaceous materials Extracting this gold requires pretreatment such as pressure oxidation or roasting to remove carbonaceous materials and sulphides followed by the application of alkali cyanide or thiosulphate solution to leach gold These processes are energy

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