pretreatment of refractory gold ore

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...

MICROBIAL PRE

MICROBIAL PRE-TREATMENT OF DOUBLE REFRACTORY GOLD ORES United States Patent Application 20090158893 Kind Code A1 Abstract The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media...

Atmospheric alkaline pre

Four iron-sulphide-containing gold ores from the White Mountain mine in the Jilin Province China were studied to examine the benefits of using oxidative treatment prior to conventional cyanidation to leach gold This pre-treatment consisted of bubbling air into an ore/water mixture for eight hours while adding enough caustic sodium hydroxide to maintain a pH of 11 throughout the test Three...

INVESTIGATION OF THE AMENABILITY OF A COPPER

In this study the amenability of a copper-rich gold ore 108 g/t Au 160 Cu to cyanide leaching was investigated Direct cyanide leaching of the ore showed that the gold extraction was very low by 184 over 24 h indicating that the ore is highly refractory Sulphuric acid pretreatment for...

Sequential pretreatment of double refractory gold ore

Double refractory gold ore was sequentially pretreated to oxidize sulfides by thermophilic archaeon Acidianus brierleyi and then to decompose carbonaceous matters using the cell-free spent medium CFSM from white-rot fungus Phanerochaete chrysosporium The pretreatment by A brierleyi significantly improved the gold recovery from 25 to 77...

GOLD RECOVERY OF REFRACTORY SULFIDE CONCENTRATES

recovery from the refractory sulfide gold or An oxidative pretreatment of the ore is essential to oxidize the sulfides and expose gold The conventional methods of extraction of refractory sulfide gold ores usually follow roasting-leaching and electrowinning steps Roasting is one oxidative pretreatment...

Gold extraction

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 process These refractory ores require pre-treatment in order for cyanidation to be effective in recovery of the gold...

US20090158893A1

The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media US20090158893A1 - Microbial pre-treatment of double refractory gold ores - Google Patents Microbial pre-treatment of double refractory gold ores Download PDF Info Publication number...

Optimizing the alkaline oxidation pretreatment of a

Optimizing the alkaline oxidation pretreatment of a refractory gold ore using taguchi orthogonal array method To cite this article Foad Mahmoodi and Asghar Azizi 2018 Mater R Express 5 126516 View the article online for updates and enhancements Recent citations Synergistic effect of reduction leaching of manganese anode slime and oxidation...

The reasons of gold refractory Gold ore classification

Nov 28 2016 0183 32 The reason of the gold mineral refractory There are so many types of reasons that caused the difficulty of gold ore processing including physical element chemical element and mineralogical element...

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...

Research status of carbonaceous matter in carbonaceous

Key words carbonaceous gold ores carbonaceous matter pretreatment bio-oxidization research status 1 Introduction The gold ores mainly are categorized into two types non-refractory and refractory With the increasing exhaustion of non-refractory gold ores refractory gold ores have become main materials of the gold industry...

ECONOMICS OF REFRACTORY GOLD ORE PROCESSES

Refractory gold ore pretreatment processes continue to receive much attention This paper compares the relative economics of treating ores by oxygen pressure oxidation roasting and bacterial oxidation with or without preconcentration by froth flotation Capital and operating cost estimates for each method of pretreatment were prepared and...

Sulphidic refractory gold ore pre

Mar 01 2013 0183 32 Often the gold bearing ores are refractory due to the gold grains and concentration by flotation is necessary either followed by roasting bacterial leaching or pressure leaching in a way that the gold is liberated prior to cyanidation Two basic initial approaches are available either treating the whole ore or processing some form of...

ACID OXIDATION PRETREATMENT OF REFRACTORY GOLD ORE

57 Claim 1 A process for recovering gold from refractory auri- ferous iron-containing suiphidic ore comprising feeding ground ore as an aqueous slurry to an acidic pretreatment step treating the ground ore in the acidic pretreatment step with aqueous sulphuric acid solution to decompose car- bonate and acid consuming gangue compounds which might other- wise inhibit a subsequent pressure...

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...

Developments in the pretreatment of refractory gold

Developments in the pretreatment of refractory gold minerals by nitric acid D-X LI College of Environmental Science and Engineering China The paper covers many literature reports of processes using nitrogenous species as an oxidant for processing refractory gold ores especially development in the pretreatment of refractory gold...

The Latest Development of Pretreatment of Refractory Gold Ores

The gold resources in China and present status of pretreatment process of various refractory gold ores are reviewedAnalysis is made of the characteristics of the pretreatment technologies such as roasting oxidization pressure oxidization bio-oxidization chemical oxidization and microwave heatingIt is pointed out that the microwave pretreatment characterized by uniform heating and low energy...

WO2009069005A2

The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media The fungal agent is inoculated in the feed material to either decompose sulfide sulfur or deactivate preg robbing carbon The culture media is applied m the absence of a microbe to decompose some sulfide sulfur and release a portion of the gold...

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...

Improvement of Gold Leaching from a Refractory Gold

from these refractory gold ores 5 6 The pretreatment of oxidative roasting has always been one of the most extensively used methods in China attributing to its mature technique high ef´Čüciency energy conservation etc 7 8 Effective...

Alkaline sulfide pretreatment of an antimonial refractory

This paper presents the alkaline sulfide pretreatment of an antimonial refractory gold and silver ore In the ore gold occurs mainly as gold-silver alloys and as associated with quartz and framboidal pyrite grains and to a small extent as the inclusions within antimonial sulfid Silver is present extensively as antimonial sulfides such as andorite Alkaline sulfide pretreatment was shown...

Pretreatment Process on Refractory Gold Ores with As

Therefore pretreatment of arsenic-bearing refractory gold has an extremely important significance 3 In recent years researches are 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...

Microbial Pretreatment of Refractory Gold Ore

For coarse grain size of gold after crushing and grinding by flotation gravity concentration cyanide leaching process or several process combined treatment will be able to complete the separation of gold and gangue minerals but there are some curing refractory gold ores due to coarse size or thin and gangue minerals symbiosis relations complex factors through the above process unable to...

Lowering the Threshold for Refractory Gold Deposits with N

Figure 2 shows how biooxidation can be used as a pretreatment step in a conventional gold mill Processing refractory ore involves the addition of flotation coated biooxidation and neutralization unit operations The coated biooxidation process is shown in greater detail in Figure 3 Here a sulfide gold concentrate is coated onto support rocks...

PDF Implementation of sodium hydroxide pretreatment for

The low gold and silver extractions from the ore indicated its refractory nature to cyanide leaching and the need for a suitable chemical pretreatment process to improve metal dissolutionRefractory gold ores do not respond to direct cyanidation therefore such ores have to be pretreated prior to cyanidation to liberate the contained gold and...

Ozone Science Engineering Pretreatment with Ozone for

sons that explain why ores can be refractory the most common being the occlusion of the submicroscopic gold within the sulfide minerals In order to recover the pre-cious metals contained in refractory ores it is necessary to modify the matrix of the ore by an oxidative pretreatment to expose the metals to cyanide The common alternatives...

Leaching Guide of Refractory Gold Ore

1What Is Refractory Gold Ore With the development of beneficiation technology the definition of refractory gold ore is changing Generally speaking refractory gold ore in leaching field is a kind of ore whose leaching rate of gold is less than 80 when...

Biooxidation of Refractory Gold Ores The Geobiotics

Brierley JA Biooxidation heap technology for pretreatment of refractory sulfidic gold ore In Biomine 84 Adelaide Australia Australian Mineral Foundation 1994...

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...

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