of refractory sulphide gold ores and concentrates

of refractory sulphide gold ores and concentrates

EA011927B1 Method of recovering gold from refractory sulphide ores

This invention relates to a method of recovering metal values from refractory sulphide ores and concentrates The method includes the steps of comminuting a refractory sulphide ore or concentrate treating the ore or concentrate in an alkaline solution and recovering the metal values from the treated ore or concentrate

the effect of initial ph on surface properties of ferric

Match case Limit results 1 per page The effect of initial pH on surface properties of ferric ion precipitates formed during microbial oxidation of ferrous ion by Leptospirillum ferriphilum in a CSTR By Bongolwethu Professor Mabusela Dissertation presented for the Degree of Master of Engineering degree In the Department of Chemical Engineering Cape Peninsula University Of Technology Supervisor

PDF Gold recovery of refractory sulfide concentrates using direct

Gold Extraction from Refractory Sulfide Gold Concentrates A Comparison of Bio oxidation and Neutral Atmospheric Pre treatment and Economic Implications Article Aug 2024 James

of refractory sulphide gold ores and concentrates

This process which has been developed for the treatment of high grade sulphide flotation concentrates is proposed for the pretreatment of gold bearing sulphide ores 1 I N T R O D U C T I O N Refractoriness Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine

Refractory Gold Ore Treatment Methods Mineral Processing Metallurgy

Cyanidation and concentration of gold and silver ores List Gold Refractory Process Methods The use of roasting for the oxidation of sulfides has declined over the years However Resolute Mining resurrected the Syama project in Mali by converting the process from a whole ore roast to flotation followed by concentrate roasting

PDF 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

shibang/sbm methods of maintaining mineral processing gold at

You can not select more than 25 topics Topics must start with a letter or number can include dashes and can be up to 35 characters long

Treatment of Refractory Gold Ores SpringerLink

Rose and Newman s very comprehensive book The Metallurgy of Gold does not even contain the term refractory in its latest fourth edition 1937 1 Dorr and Bosqui s Cyanidation and Concentration of Gold and Silver 2d edition 1950 has a brief chapter XIII on Cyanicides and Refractory Ores with only four pages devoted to refractory ores

A mineralogical perspective on the recovery of uranium from brannerite

The results demonstrate that uranium recoveries of 80% can be achieved on Cooke Section ores at low acid dosages and high temperatures 18 kg/t 60°C or at moderate acid dosages and low temperatures 23 kg/t 30°C The associated reduction of input costs would represent a significant cost saving for the Ezulwini gold and uranium recovery

Materials Free Full Text Synthetic Sulfide Concentrate Dissolution

The results obtained can be used in predicting hydrometallurgical processes for sulfide materials such as copper arsenic ores and concentrates treatment in HNO 3 media Further detailed kinetic studies on the dissolution of sulfide minerals in HNO 3 media such as Cu 3 AsS 4 Cu 12 Sb 4 S 13 Sb 2 S 3 Cu 5 FeS 4 are of great interest

Copper Flotation Extracting Copper Ore Processing Plant Leaching

Type Gravity Separator Voltage 380V Material Carbon Steel Certification ISO9001 2024 ISO9001 2024 CE Energy Saving Energy Saving Warranty 1 Year

The adsorption characteristics and performance of gold onto elemental

Refractory carbonaceous gold concentrate contains carbonaceous matters that seriously interfere with the gold extraction process Therefore the in depth experimental studies on the gold adsorption performance of elemental carbon extracted from refractory carbonaceous gold ores is of significant importance carried out in this article

PDF Refractory gold ores in Archaean greenstones Western Australia

The most common sulphide ore types can be sub divided broadly into pyritic pyrite± pyrrhotite and arsenical types pyrite arseno pyrite± pyrrhotite Arsenical ores vary from highly refractory to free milling Arsenopyrite in highly refractory ores is finer grained As deficient at % As contains high average concentrations

traitement des minerais aurifères Traduction en anglais exemples

Traductions en contexte de traitement des minerais aurifères en français anglais avec Reverso Context Les atteintes à l environnement sont aggravées par les techniques de traitement des minerais aurifères

Characterizing gold in refractory sulfide gold ores and residues

Gold is present in refractory sulfide gold ores mainly in arsenian pyrite and arsenopyrite where it occurs in both the chemically bonded state and as nano size grains of metallic

The Many Faces of Fool s Gold American Scientist

The process exposes more of the gold and subsequent cyanidation of the bio oxidized concentrates can result in increases in gold recovery from just 30 percent to more than 95 percent The use of microorganic reactors to prepare pyritic gold ores for cyanidation has become widespread and numerous mines in South Africa Australia and North

Combined Column and Mechanical Flotation Cell Process for the

The auriferous sulfide ore used in this work came from the feed of the flotation circuit at the Sanshandao Plant Shandong China The concentrate gold grade increased and the recovery of gold decreased with the increase of the feed rate When the feed rate varied between and t/h the recovery of gold was essentially flat

le vol de minerai aurifère Traduction en anglais exemples français

Traductions en contexte de le vol de minerai aurifère en français anglais avec Reverso Context Conformément à une ordonnance du Juge en chef l intervenant a obtenu l autorisation de présenter une nouvelle preuve concernant l importance du problème que représente le vol de minerai aurifère au Yukon et au Québec

US4923510A Treatment of refractory carbonaceous sulfide ores for gold

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 economic basis

Refining gold sulphide ore concentrate

The ore was primarily quartz with streaks of iron pyrite silver gold and galena The ore was crushed fine in a ball mill then run with cyanide and bromine Extraction was well over 99% even without eliminating the sulfides I tried a similar process with the pyrite mentioned above but got almost no recovery

The reasons of gold refractory Gold ore classification and

Classification of refractory ores 1 Carbonaceous gold ore There is organic carbon which can do Rob gold in gold and silver ore and it causes that gold is adsorbed in the

Microbial oxidation of gold ores and gold bioleaching FEMS

This paper reviews recent progress in the use of microorganisms tooxidize the sulfidic matrix in refractory gold ores bio oxidation and to solubilize elemental gold bioleaching Arsenopyrite oxidation Bioleaching Biohydrometallurgy Pyrite oxidation Refractory gold ores Thiobacillus ferrooxidans Issue Section Minireview References 1

PDF Bioleaching of Gold from Sulfidic Gold Ore Concentrate and

Gold bioleaching mediated by iodide oxidizing bacteria IOB has been proposed as a sustainable alternative to conventional technologies such as cyanidation This study evaluated the ability of two IOB sourced from a commercial culture collection Bioleaching of Gold from Sulfidic Gold Ore Concentrate and Electronic Waste by Roseovarius

PDF Chloride Hypochlorite Oxidation and Leaching of Refractory Sulfide Gold

This shows that the ore is a sulfide refractory gold ore Saba et al 2024 Chloride hypochlorite oxidation and leaching of refractory sulfide gold concentrate 65 Fig 3 Particles size analysis of gold concentrate Fig 4 XRD analysis of gold concentrate obtained by flotation Table 1 Major elements composition of the ore and floated

PDF Refractory gold bearing ores a review of treatment methods and

in a paper on treatment methods for refractory gold bearing ores iglesias and carranza 1994 bioleaching is mentioned as a pre treatment based on the action of bacteria

Barrick details NGM projects at New York event

BARRICK GOLD CORP Barrick Gold Corp outlined Nevada Gold Mines plans projects and discoveries at Investor Day presentations in New York that also covered Barrick s worldwide operations and

Autoclave oxidation processing of refractory gold containing sulphide

This article gives the results of development of technology of two stage low temperature autoclave oxidation of refractory gold containing sulphide ores Flotation concentrates of several Russian Far Eastern deposits became the objects of this research The first stage of research demonstrated the effect of source material size temperature and oxygen partial pressure on the process

PDF Refractory Gold Technology

Refractory Gold Technology Sherritt s Refractory Gold Technology is used to recover gold from refractory sulphide feedstocks Many gold ores and concentrates contain fine grained gold locked within sulphide minerals such as pyrite and/or arsenopyrite unavailable for recovery by conventional leaching In Sherritt s gold process the

WO2005064023A1 A method of recovering metal values from refractory

This invention relates to a method of recovering metal values from refractory sulphide ores and concentrates The method includes the steps of comminuting a refractory sulphide ore or concentrate treating the ore or concentrate in an alkaline solution and recovering the metal values from the treated ore or concentrate

Mineralogical characteristics and treatment of refractory gold ores

Refractory gold ores and concentrates are characterised by low gold recoveries and high cyanide consumptions when subjected to direct cyanide leaching Therefore an oxidation pretreatment step is required before cyanidation that will break up the sulphide lattice and render gold particles accessible to cyanide ions

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