leaching gold sulfides
Leaching Pyrite Gold Ore without Cyanide
By acid hydrolysis thiourea can decompose into urea NH2CONH2 and hydrogen sulfide H2S Elemental sulfur and hydrogen sulfide are undesired species during gold leaching It is believed that both species cause a decrease in the leaching rate due to surface passivation and H2S may cause reprecipitation of the gold Sparrow and Woodcock 1995
A Kinetic Study Of Gold Leaching In CuBr NaBr System
A Kinetic Study Of Gold Leaching In CuBr 2NaBr System EncinasRomero Mart 237n A TiburcioMunive Guillermo and Y 225nezMonta 241o Mireya Department of Chemical Engineering and Metallurgy University of Sonora Hermosillo Sonora 83000 M 233xico maencinas iq uson mx Abstract The CuBr 2NaBr system was applied
Effect of Pretreatment on Leaching Primary Copper Sulfide
The aim of this study was to improve the dissolution of copper sulfide ore composed mainly of chalcopyrite 1 21 wt and bornite 0 54 wt using a pretreatment before leaching The effect of the pretreatment on copper sulfide dissolution was investigated using different types of leaching Three sets of experimental tests were performed flask reactor and minicolumn
Gold leaching by organic base polythionates new nontoxic
Method of gold recovery from sulfide auriferous ores has already been proposed Smolyaninov et al 2010b The invention relates to the method of gold recovery from powdered sulfide auriferous ores after their unlocking by bacterial leaching or by oxidation roasting or by autoclave oxidation Gold leaching by polythionates new nontoxic
Alkaline sulfide gold leaching kinetics ScienceDirect
ASL gold leaching fundamentals – REQCM experimental method In order to delineate the alkaline sulfide gold leaching reaction mechanism some fundamental electrochemical leaching tests were undertaken at Monash University at the request of the author using a rotating electrochemical quartz crystal microbalance REQCM
Fundamentals and appliions of alkaline sulfide leaching
Fundamentals and appliions of alkaline sulfide leaching and recovery of gold Corby Anderson Eric Dahlgren Paul Miranda and Darby Stacey The Center for Advanced Mineral and Metallurgical Processing Montana Tech Room 221 ELC Building Butte Montana 59701 USA Tel 4064964794 Fax 4064964512 Email CAnderson mtech edu Matthew Jeffrey and Irsan Chandra Department
Alkaline Oxidative Leaching of GoldBearing Arsenopyrite
ALKALINE OXIDATIVE LEACHING OF GOLDBEARING ARSENOPYRITE ORES By P Bhakta 1 J W Langhans Jr 1 and K P V Lei2 ABS quotrRACT The U S Bureau of Mines developed an alkaline oxidative pretreatment leaching procedure to increase the recovery of gold from arsenopyrite FeAsS ores The best solution compositions for
Sulphide Gold Gekko
Because cyanide cannot always leach sulphideassociated gold regrinding the ore is typically required to expose the free gold for recovery by intensive leaching Critically the size at which one can efficiently liberate gold from the host mineral of the particle will determine the process to use for optimal gold
A fundamental study of the alkaline sulfide leaching of gold
This can be viewed as follows 5 S X2 − X − 1 SbS 33− → X − 1 SbS 43− S 2 − In the present paper a kinetic study of gold leaching in alkaline sulfide solutions is presented For the gold leaching system both a complexing lixiviant and an oxidant are required to effect dissolution
ECONOMICS OF REFRACTORY GOLD ORE PROCESSES
ECONOMICS OF REFRACTORY GOLD ORE PROCESSES John E Litz and R Wayne Carter 119th TMS Annual Meeting February 1822 1990 these estimated costs and ore sulfide grades then are used to compare the process Oxygen utilization during leaching is assumed at 80 The flashed slurry is neutralized and cooled to 40 176C prior to
THIOSULFATE LEACHING OF SILVER FROM A SOLID RESIDUE
leach sulfides that is bornite and chalcocite Furthermore a significant amount of pyrite additionally enhances the copper leaching rate by galvanic effects Chmielewski 2012 A series of thiosulphate leaching experiments was conducted The effect of thiosulfate ammonia copper ions concentration on silver leaching efficiency
ALKALINE SULFIDE RECOVERY OF GOLD UTILIZING NITROGEN
This paper outlines the appliion of an industrially proven pressure leaching methodology utilizing nitrogen species alyzed pressure leaching and alkaline sulfide gold leaching As such it stands as an economic and engineering advancement in pressure leaching and noncyanide treatment of gold ores and concentrates
Sulfides Selenides and Tellurides rebellious and
Many sulfide minerals also contain things like copper or antimony that can react with the cyanide preventing the cyanide from leaching out the gold and silver For information on methods to deal with and extract gold silver and base metals from these refractory ores I
Bioleaching Wikipedia
Bioleaching is the extraction of metals from their ores through the use of living organisms This is much cleaner than the traditional heap leaching using cyanide Bioleaching is one of several appliions within biohydrometallurgy and several methods are used to recover copper zinc lead arsenic antimony nickel molybdenum gold silver and cobalt
Microbial leaching of arsenic from low sulfide gold mine
ments to determine the likelihood that T ferrooxidans will leach arsenic from lowsulfide placer gold bearing gravels Leaching Experiments Table 1 shows elemental composition total arsenic nonfixed arsenic and sulfide as iron sulfide content of the material used for the leaching experiments When this lowsulfide material was
Leaching of a Gold Bearing Partially Roasted Sulphide
Leaching of a Gold Bearing Partially Roasted Sulphide Laboratory Scale Studies M F Almeida Faculdade de Engenharia da Universidade do Porto Rua Dr Roberto Frias s n 4200465 Porto Portugal Received June 19 2001 Revised October 12 2001 This research aimed at defining a route for recovering precious metals from a very heterogeneous
Alkaline Sulfide Gold Leaching Kinetics MAFIADOC COM
Alkaline Sulfide Gold Leaching Kinetics C G Anderson1 1 Kroll Institute for Extractive Metallurgy George S Ansell Department of Metallurgical and Materials Engineering Colorado School of Mines Golden Colorado 80401 Corresponding author email protected ABSTRACT Recently leaching of gold with cyanide has come under scrutiny for its possible detrimental effects to the environment
STGEORGES ECO MINING LTD 187 High MgO Sulfides Leaching
HighpH leaching of high MgO sulfide ores R ampD Initiative Summary Low grade nickel sulfide ores often contain magnesium bearing minerals that report to the concentrates making them difficult to smelt High MgO concentrates can also be difficult to treat hydrometallurgically as the MgO minerals can consume large amounts of acid and release large amounts of magnesium into the process solutions
Cyanide leaching of gold in solutions containing sulfide
Request PDF on ResearchGate Cyanide leaching of gold in solutions containing sulfide A large proportion of the gold processed in the 21st century will be recovered from sulfide ores Since the
Oxidative Hydrometallurgy of Sulphide Minerals InTech
Oxidative Hydrometallurgy of Sulphide Minerals F R CarrilloPedroza M J So riaAguilar E SalinasRodr 237guez A Mart 237nezLuevanos T E PecinaTrevi 241o and A D 225valosS 225nchez Autonomous University of Coahuila Mexico 1 Introduction Sulphide minerals are one of the most important sources of value metals such as gold
BIOX 174 Process Outotec
The process was developed for the pretreatment of refractory concentrates ahead of conventional cyanide leaching for gold recovery As the gold is encapsulated in sulfide minerals such as pyrite and arsenopyrite the gold is prevented from being leached by cyanide The BIOX process destroys sulfide minerals and exposes the gold for subsequent
8 Microbial Leaching of Metals WileyVCH
8 Microbial Leaching of Metals HELMUT BRANDL Z 252rich Switzerland 1 Introduction 192 2 Terminology 192 isms In the case of copper copper sulfide is microbially oxidized to copper sulfate and metal values are present in the aqueous phase in the before mentioned gold mines running from the gold vein In cold weather during the
Associated Sulfide Minerals in Thiosulfate Leaching of
leaching rate but also increase the consumption of thiosulfate Comparable gold extractions were observed in the leaching of the composite ores containing various sulfide minerals such as pyrite pyrrhotite chalcocite galena and chalcopyrite The leaching of gold in the presence of iron sulfides was also improved by
Recovery of Gold in Pyritic Sulfide Ores Mine Engineer Com
information on pyrtiric gold leach Recovery of Gold in Pyritic Sulfide Ores The now extinct Us Bureau of Mines conducted numerous studies of gold in pyrite and sulfide ores over the years until their untimely demise in the 1990 s