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Improved gold and silver extraction from a refractory antimony ore by pretreatment with alkaline sulphide leach
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Table of ContentsExperimental ProceduresResults and DiscussionProposed Process Flowsheet The US Bureau of Mines developed an alkaline oxidative pretreatment to increase the recovery of gold from refractory sulfide ores containing arsenopyrite FeAsS andor pyrite FeS2 Pretreatment of a low grade ore containing 04 FeAsS 35 FeS2 and 274gmt Au with 12M NaOH 40 psig 02 100176 C4243
The oxidation of refractory arsenical gold concentrates in aerated alkaline solutions results in the formation of thiosulfate arsenate and sulfate as well as the dissolution of gold copper and iron4710
alkaline oand idation refractory gold jainindia Alkaline Pressure Oxidation of a GoldBearing Today the treatment of refractory gold ores and concentrates is Oand Idation Of Alcohols By Mno2 With Ball Mill Get Price And Support Online Effect of Mechanochemical Activation on Surface3995
Refractory gold occurs at sites whi ch are preferenti all y leached by the bacteri a The rate of gold liberation from sul fides is enhanced during the earl y stages of bacteri al ox idation Defects in crystal structure influence the rate of biooxidati on and is directl y related to the crystal structure of the sulfide mineral the crystall4382
1 Introduction Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80 even after fine grinding 1 Arsenicbearing 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 lattice3963
Gold Sulphide Ore Oxidation by Alkaline Pressure High Pressure O Idation Of Refractory Gold Minerals high pressure oxidation goldCrushers Get Price ECONOMICS OF REFRACTORY GOLD ORE ECONOMICS OF REFRACTORY GOLD ORE PROCESSES John E Litz and R Wayne Carter 119th TMS Annual Meeting February 18224618
High Pressure O Idation Of Refractory Gold Minerals Refractory ore resists normal processing methods as the high sulfide minerals trap gold refractory gold PRESSURE Get Price High Pressure O Idation Of Refractory Gold Minerals high pressure oxidation gold Raymond high pressure oxidation of refractory gold minerals 14 Jun 2012 Gulin supply Mining and construction equipment for mineral4721
Gold Extraction Process Start by reducing the size of gold to smaller Melt gold pour gold while melting through a 2 mm sieve into the water Reducing the size of gold to smaller Will help in the process of aqua regia to make gold into the solution more quickly aqua regia is composed of 2 chemical substances 1 nitric acid 3 hydrochloric acid mixed together4476
refractory ores gain in importance Some 1520 of current world gold production involves refractory ores that must be pretreated prior to downstream recovery by cyanidation Ores are refractory for many reasons but commonly because gold occurs as tiny inclusions or submicroscopic gold within a sulphide mineral matrix This mineral matrix3888
A total gold extraction of 702 could only be reached via direct cyanidation from a refractory As S and Cbearing gold concentrate calcine and the gold extraction varied noticeably with different size fractions The reasons for unsatisfactory gold extraction from the calcine were studied through analyses of chemical composition chemical phase and SEMEDS of different sizes of particles4064
Neutral and alkaline bioheap oxidation of refractory gold ores with adaptive moderatethermophilic and mesophilic microorganisms The project has been defined to address the growing concerns of the mining industry towards sustainable copper production with low cost and environmentally friendly process option The current processes for copper4716
American Barrick operates two autoclaves for the processing of refractory gold ores Because of the mineralogy of the ores one autoclave is alkaline and the other acidic The pH of operation has a significant effect on materials of construction as well as capital and operating costs The following summary concentrates on the practical and economic aspects of such operations3443
Where the main gold bearing refractory mineral in the concentrate is pyrite the oxidative leach is typically carried out under alkaline conditions The leach conditions are set to ensure the formation of goethite as the major iron reaction product The alkaline leach conditions accelerate the rate of4684
The leaching experiments also have shown that gold may dissolve in alkaline thioarsenite solutions which provides a possible new process option for the leaching of goldud ud The oxidation of refractory arsenical gold concentrates in aerated alkaline solutions results in the formation of thiosulfate arsenate and sulfate as well as the3768
alkaline pressure oand idation of gold concentrates With the Desert Fox Gold Panning Machine you can process your concentrates much faster and your gold recovery and efficiency will improve by a factor of 50alkaline pressure oand idation of gold concentrates gold mining africas sites manufactures industrials Others link4131
Jan 01 1994018332Hydrometallurgy 34 1994 383395 383 Elsevier Science BV Amsterdam Refractory goldbearing ores a review of treatment methods and recent advances in biotechnological techniques Nieves Iglesias and Francisco Carranza Chemical Engineering Department University of Sevilla 41012 Sevilla Spain Received January 10 1993 revised version accepted March 16 1993 ABSTRACT4524
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The present invention is directed to an improvement in a process for the recovery of gold from refractory sulfidic auriferous ores which comprises oxidizing a slurry of ore with oxygen gas under pressure in the presence of sulfuric acid neutralizing the oxidized slurry cyanidizing the neutralized slurry to leach gold therefrom and recovering gold from the resultant leachate3356
Refractory gold ores are those that do not yield high gold recoveries in conventional cyanideleaching circuits even when the ore is finely ground determined by the reaction conditions which range from mild in alkaline leaching and biological leaching to the aggressive conditions found in pressure oxidation The gold and sulphur sulphides3154
of refractory gold Statistics show that in the world about 23 gold resource belongs to the difficult processing ores and about 13 total output of world gold is produced from refractory gold This proportion will further increase in future Therefore pretreatment of arsenicbearing refractory gold has an extremely important significance4296
The Gold Stryker GS4000HV uses a 13 HP Honda Industrial engine for many years of trouble free use Get Price gold ore grinding ball mill machine company professional A wide variety of gold mining ball mill options are available to you such as ball mill raymond mill4821
The Eldorado Gold Corp has developed a method of treating a hardtoprocess ore from a mine in China in order to increase their recovery of gold While this process has proven to be effective more research is needed on the exact method in which this technique works on a very smallscale and detailed basis The research that will be undertaken involves testing a number of different types of4448
Improved gold and silver extraction from a refractory antimony ore by pretreatment with alkaline sulphide leach Hydrometallurgy 105 34 234239 Layanan Online Improved gold and silver extraction from a refractory3068
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