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DoubleRefractory Carbonaceous Sulfidic Gold Ores
2016年1月1日· Abstract Ores where gold is associated with sulfides and with high carbonaceous matter content are considered double refractory Ores in the Carlin2007年9月1日· Abstract Double refractory gold ores, such as Barrick’s Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of goldMicrowave pretreatment of a double refractory gold ore
Processing double refractory goldarsenicbearing
2016年11月1日· The term double refractory is applied when refractoriness of the gold ore is exacerbated by the presence of pregrobbing carbonaceous material The problem of2020年9月10日· Keywords: double refractory gold ore; biooxidation; pregrobbing; thiourea leaching; green technology 1 Introduction Environmentally friendly goldMetals | Free FullText | BioOxidation of a Double
Biological pretreatment of carbonaceous matter in double
2020年9月1日· The pretreatment of carbonaceous material in double refractory gold ores (DRGO) is necessary to decrease pregrobbing of gold and maximize gold recovery2020年11月12日· Pyrometallurgical processing is shown to be promising for treating ores obtained from refractory and doublerefractory gold deposits Problems related to theExtraction of Gold from Refractory GoldBearing Ores by
Processing double refractory goldarsenicbearing concentrates by
2016年11月1日· The term double refractory is applied when refractoriness of the gold ore is exacerbated by the presence of pregrobbing carbonaceous material The problem of2021年8月26日· The flotation feed used in this study was double refractory gold ore containing both carbonaceous matter and sulfide from Barrick’s flagship Goldstrike mine in Nevada, USA Xray diffractionFlotation of Carbonaceous Matter from a Double
Pore Evolution in Refractory Gold Ore Formed by Oxidation
2022年2月2日· Introduction Gold is a strategic mineral resource with financial attributes China’s gold consumption has remained the world’s largest for consecutive years, and its production has ranked first in the world for 10 years 1,2 However, the amount of easily exploited highgrade gold ores has rapidly decreased Thus, the gold ore associated2018年11月1日· Pregrobbing of gold in chloridebromide solution Riina Ahtiainen, M Lundström Materials Science 2016 One of the major issue in gold chloride leaching is a tendency of gold to either precipitate or adsorb on a carbonaceous matter in an ore, ie pregrobbing This paper discusses issues related to a[PDF] Pregrobbing verification and prevention in gold chloride
Minerals | Free FullText | Significance of Acid Washing after MDPI
2021年11月25日· Environmentally friendly pretreatment of double refractory gold ores (DRGO) to improve gold recovery without emitting pollutant gas is challenging Sequential biotreatment, including ironoxidizing microorganisms to decompose sulfides, followed by the enzymatic decomposition of carbonaceous matter, was recently developed The effect of2021年8月26日· The use of alkaline pressure oxidation to pretreat refractory gold ore often results in insufficient gold recovery (<60%) in downstream thiosulfate leaching To improve gold recovery, flotation was considered for the separation of carbonaceous matter (Cmatter) In this study, the effect of MIBC on Cmatter flotation was investigated toFlotation of Carbonaceous Matter from a Double Refractory Gold
A twostage bacterial pretreatment process for double refractory gold
2005年1月1日· Double refractory gold concentrates were subjected a twostage microbial process to destroy both sulfides and carbonaceous matter In the first stage, the wellknown sulfide biooxidation process, which utilizes chemolithotrophic bacteria was used to oxidize sulfides and in the second stage carbonaceous matter is destroyed using the bacteriumThe invention relates generally to hydrometallurgical gold recovery processes and particularly to biological processes for recovering gold from refractory and double refractory materials BACKGROUND In carbonaceous gold bearing ores, preg robbing occurs when active carbon, indigenous to the ore, complexes with the gold dissolved inWOA2 Microbial pretreatment of double refractory gold
Method for recovering gold Justia Patents Search
2016年10月27日· The gold recoveries of the comparative leaching tests are shown in FIG 2 It can be seen from FIG 2 that leaching of a double refractory raw material directly by chloride solution (Test 1) a gold recovery rate of 25% was achieved When the same material was first oxidized by pressure oxidation and then leached, the gold recovery2018年4月1日· Enzymes and hydrogen peroxide play an essential role in this process Key words: Phanerochaete chrysosporium; pyrite; biodissolution; Carlintype gold ores; electrochemistry 1 Introduction Carlintype gold ores are a kind of refractory gold ores due to the microdisseminated gold and the “pregrobbing†of carbonaceous compoundsBiodissolution of pyrite by Phanerochaete chrysosporium
Biological pretreatment of carbonaceous matter in double refractory
2020年9月1日· Double refractory gold ores (DRGO) are becoming increasingly attractive as a source of gold, owing to the depletion of easier to process ores The double refractory behavior is a consequence of the pregrobbing of dissolved Au species (Au(CN) 2 − ) by carbonaceous matter and encapsulation of the gold in sulfide minerals such as pyrite2005年1月1日· Double refractory gold concentrates were subjected a twostage microbial process to destroy both sulfides and carbonaceous matter In the first stage, the wellknown sulfide biooxidation process, which utilizes chemolithotrophic bacteria was used to oxidize sulfides and in the second stage carbonaceous matter is destroyed using the bacteriumA twostage bacterial pretreatment process for double refractory gold
Biotechnological Approaches to Facilitate Gold
2020年10月30日· Double refractory gold ore (DRGO) not only include ppt levels of gold grains locked in sulfide minerals but also a problematic amount of carbonaceous matter This causes a significant recovery lossRefractory gold ores are typified by the presence of either ultrafine gold particles disseminated throughout the gold bearing mineralization, or, gold in solidsolution within the mineral matrix Common refractory gold bearing minerals include arsenopyrite, pyrite and copper sulphides, which are highly resistant to extraction by standardRefractory gold evaluation alsglobal
Biodissolution of pyrite by Phanerochaete chrysosporium
2018年4月1日· Mycohydrometallurgy: Biotransformation of double refractory gold ores by the fungus, Phanerochaete chrysosporium [J] Hydrometallurgy (2013) Pyrite biooxidation can improve the gold leaching extent of refractory gold ores, but it can also cause environmental pollution In this work, common gangue minerals (feldspar, mica,Significance of acid washing after biooxidation of sulfides in sequential biotreatment of double refractory gold ore from the syama mine, mali Cindy, R Sakai, DM Mendoza, KT Konadu, K Sasaki Minerals 11 (12), 1316, 2021 1: 2021: Enzymatic pretreatment of carbonaceous matter in pregrobbing gold ores: Effect of ferrous ion additivesKojo T Konadu Google Scholar
Minerals | Free FullText | CIL Gold Loss Characterization within
2019年9月16日· A double refractory gold ore contains gold particles locked in sulphides, solidsolution in arsenopyrite, and pregrobbing material such as carbonaceous matter, and so on The diagnostic leach test (DLT) and pregrobbing (PR) approaches are widely used to investigate the occurrence and the distribution of refractory gold DLT serves to2022年5月1日· Double refractory gold ores, such as Barrick’s Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leachingLaccasemediator system for enzymatic degradation of
Transformation of the carbonaceous matter in double refractory gold
2019年9月1日· Sulfides and carbonaceous matter in double refractory gold ore (DRGO) were biotreated sequentially using an ironoxidizing archaeon Acidianus brierleyi followed by lignin peroxidasedominating crude enzymes released from the whiterot fungus Phanerochaete chrysosporium to significantly improve gold recovery from 24% to 92%2020年7月1日· The refractory gold ores, which contain both gold locking in sulfides and pregrobbing by CM, are classified as a double refractory gold ores, abbreviated as DRGOs (Nanthakumar et al, 2007)Biological pretreatment of carbonaceous matter in double refractory
A systematic review of sustainable gold extraction from raw ores
2022年3月1日· Refractory character is determined by the gold's ultrafine occlusion inside sulfide minerals, particularly pyrite and arsenopyrite It is common to distinguish free milling from refractory on the basis of the intensity of cyanide leaching required: it is greater than 90% in the case of the former, and less than 80% for the latter (Marsden and House, 2006)2022年6月21日· A recent Nevada Gold Mines research program focused on pressure oxidation pretreatment of a Carlintype double refractory ore from the Turquoise Ridge Mine The research team found that both arsenian pyrite and carbonaceous matter were highly oxidized within an hour at 300 °C using a benchtop autoclave reactor and that theNearTechnical Limit Gold Recovery from a Double Refractory