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Pressure oxidation Wikipedia
Pressure oxidation is a process for extracting gold from refractory ore The most common refractory ores are pyrite and arsenopyrite, which are sulfide ores that trap the gold within them Refractory ores require pretreatment before the gold can be2022年1月10日· Pressure oxidation is a widely accepted method to treat refractory gold ores Gold recovery is generally lower from alkaline than acidic pressure oxidationEnhanced Gold Recovery from Alkaline Pressure Oxidized
Pressure oxidation overview ScienceDirect
2005年1月1日· The utilization of a pressureoxidation circuit to treat refractory gold ores or concentrates is a complex decision, taking into consideration capital costs,2020年6月1日· As a result, the optimum conditions of the chlorination leaching for the refractory gold concentrate pretreated by pressure oxidation are as follows: 4 of pH,Research on chlorination leaching of pressureoxidized
The Fate of the Arsenic Species in the Pressure Oxidation
2022年1月30日· The reactions and conditions for the formation of the different products have been detailed, with the oxidation temperature, time, feed irontoarsenic ratios, and pH being the main determinants for the1999年8月1日· A pressure oxidation process in an autoclave has been evaluated as an alternative The process resulted in substantially higher gold recoveries (>90%) overAn acidic pressure oxidation pretreatment of refractory gold
Pressure Oxidation Pretreatment of Refractory Gold
1984年2月1日· Abstract Pressure oxidation of gold containing concentrates and ores is an effective pretreatment for liberating refractory gold This is particularly true when2021年3月23日· Refractory gold reserves, which require more sophisticated treatment methods in order to achieve oxideore recovery rates, correspond to 24 percent of current gold reserves and 22 percentRefractory gold reserves: Challenges and opportunities
Comparative Study of Gold Extraction from Refractory
2020年5月7日· Pyritic ores Gold extraction Pressure oxidation is a hydrometallurgical oxidative pretreatment for refractory ores, such as sulfide ores Here, simultaneous2021年4月13日· It has been suggested that direct leaching (avoiding pressure oxidation) of refractory gold ores could be technically feasible under atmospheric conditionsFull article: Direct Cupric Chloride Leaching of Gold from
Pressure oxidation Wikipedia
Pressure oxidation Pressure oxidation is a process for extracting gold from refractory ore The most common refractory ores are pyrite and arsenopyrite, which are sulfide ores that trap the gold within them Refractory ores require pretreatment before the gold can be adequately extracted [1] The pressure oxidation process is used to preparePressure Oxidation of Refractory Gold Feeds TECHNOLOGY Au V1FEB252019 The Technologies Division of Sherritt is a recognized leader and pioneer in the development and application of pressure hydrometallurgy In addition to supporting Sherritt’s existing business units, the division providesRefractory Gold Technology
Basic Iron Sulphate in Pressure Oxidation Processing SGS
Pressure oxidation technology was developed more than 50 years ago for the treatment of base metal concentrates (mainly sphalerite), and was adapted in the 1980’s for the treatment of goldcontaining pyrite and arsenopyrite ores and concentrates The conditions that have evolved for oxidation of refractory gold concentrates2005年12月31日· Abstract The utilization of a pressureoxidation circuit to treat refractory gold ores or concentrates is a complex decision, taking into consideration capital costs, operating costs, gold(PDF) Pressure oxidation overview ResearchGate
ALTA Gold 2012 EDoc Glencore Technology
leaching to the aggressive conditions found in pressure oxidation The gold and sulphur (sulphides and elemental sulphur) grades relate directly to the economics of the process Much has been written about the suitability of particular pretreatment processes, such as pressure oxidation, bio oxidation and roasting, for specific ores bodies (14)2016年11月1日· The successful commercialization of a pressure oxidation (POX) process for recovering metal values, including gold, copper, zinc, nickel and molybdenum, is the result of a carefully planned development program The initial task involves developing one or more conceptual flowsheets, including the POX autoclave and downstream purificationScaleup of pressure oxidation processes | SpringerLink
Pretreatment of refractory gold minerals by ozonation before the
2023年2月1日· Pressure oxidation has been used successfully on an industrial scale in previous works However, its capital and operating costs are significantly high [14] 212 Grinding The grinding method is an alternative for the liberation of refractory gold from sulphide minerals for further decrease in the sulphide particle size2018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 Pregrobbing verification and prevention in gold chloride
Enhanced Gold Recovery from Alkaline Pressure Oxidized Refractory Gold
2022年1月10日· Refractory gold ores contain pregrobbing matter, cyanide/oxygenconsuming matter, and/or gold locked in sulfide or silicate minerals [1,2,3]To efficiently liberate and extract gold from these ores, pretreatment methods are often used, including roasting, biooxidation, pressure oxidation, and ultrafine grinding [4, 5]When used2022年2月1日· The results show that acid pressure oxidation pretreatment can efficiently open the encapsulation of gold by pyrite and arsenopyrite in refractory gold concentrate Still, the resulting sodium jarosite and calcium sulfate are easy to cause secondary encapsulation of goldExtraction of gold from typical Carlin gold concentrate by pressure
Redox potential measurement during pressure
2017年5月15日· Pressure oxidation (POX) leaching has been commercially applied to refractory gold ores since the 1980s In the process, sulphide material is oxidized and dissolved in order to release2020年6月1日· The optimum conditions for leaching the gold in the refractory gold concentrates pretreated with the pressure oxidation are as follows: 4 of pH, above 10 V of the redox potential, 75 g/L of the NaCl concentration, and 40 °C of the leaching temperature, 3:1 of the liquidsolid ratio, and 2 h of the reaction timeResearch on chlorination leaching of pressureoxidized refractory gold
Pretreatment Process on Refractory Gold Ores with As JSTAGE
Compared with roasting pretreatment and pressure oxidation, acid treatment has low expense In the mid1980 s, the first commercial plant which applied bacterial oxidation to pretreat refractory gold ores was built in South Africa After bacterial oxidation, sulphide decomposition, arsenic comes into the solution,2022年10月9日· In the pressure oxidation (POX) of refractory goldbearing sulfides, a major environmental challenge is the treatment of the hazardous waste released from arsenicbearing minerals during processing While the bulk removal of arsenic from solution can occur during POX, the formation of stable arsenates relies on the operatingOptimization of Arsenic Fixation in the Pressure Oxidation of
Pressure oxidation of pyritearsenopyrite refractory gold concentrate
2013年1月1日· However, pressure oxidation has been used to treat refractory gold ores or concentrates as pretreatment and subsequent cyanidation Alkaline pressure oxidation is an effective pretreatment for2021年4月1日· Typically, gold is encapsulated or finely disseminated in refractory gold ores and the direct cyanidation is not effective for gold extraction from these ores, even after the ore is ground to exceeding small particles (Nazari, 2017, Corrans and Angove, 1991)Especially for sulfide refractory gold ores, in order to recover gold, manyRecovery of gold from sulfide refractory gold ore: Oxidation
Gold mineral processing Hatch Ltd
Refractory gold ore pretreatment Treatment of refractory gold ore (whole ore and flotation concentrates) has become more prominent since the 1980s, with many gold discoveries often including ores that are wholly or partially refractory Refractory pretreatment processes include pressure oxidation, biological oxidation and various forms of2021年5月1日· Many recent research activities on pressure oxidation of refractory gold ore focuse more on the control of the autoclave operation There is a lack of a systematic study on the gold distribution in the solid discharge Understanding the gold deportment in the residue will help develop a better prediction of the gold leaching behaviorGold deportment and leaching study from a pressure oxidation
Comparative Study of Gold Extraction from Refractory Pyritic
2020年5月7日· Pressure oxidation is a hydrometallurgical oxidative pretreatment for refractory ores, such as sulfide ores Here, simultaneous alkaline pressure oxidation and sodium cyanide leaching treatments were carried out on a pyritic ore from the Mulatos Mine located in Sahuaripa, Sonora, Mexico Mineral characterization, agitation leaching, hot2022年8月5日· Before treatment, the gold extraction from the CTGC was a mere 97%, gold extraction from pressure oxidation leaching residue reached 821%, Ahmad G (2022) Enhanced gold recovery from alkaline pressure oxidized refractory gold ore after its mechanical activation followed by thiosulfate leaching J Sustain Metall 8(1):186–196Noncyanide Extraction of Gold from CarlinType Gold Springer