· Pressure oxidation of gold containing concentrates and ores is an effective pretreatment for liberating refractory gold. This is particularly true when an appreciable portion of the gold is associated with sulfides and is …

DOI: 10.1016/B978-0-08-035882-6.50039-X Corpus ID: 91304567; ACID PRESSURE OXIDATION OF REFRACTORY GOLD MINERAL CARRIERS @inproceedings{Demopoulos1987ACIDPO, title={ACID PRESSURE OXIDATION OF REFRACTORY GOLD MINERAL CARRIERS}, author={George P. Demopoulos and …

 · fresh bfs and bfas precipitates, as well as their cyanidation residues, were found to pass the respective environmental tests in terms of arsenic release.introduction pressure oxidation (pox) is generally viewed as the most appropriate technology for the processing of arsenic-containing refractory gold ores due to the stabilisation of arsenic in …

 · of ore at the Lihir gold mine in Papua New Guinea (commissioned in 1997). In addition, Sherritt had conducted process development studies for Homestake's McLaughlin Mine operation in California, which had come on stream in 1985, for the treatment of refactory gold ore. Refractory Gold Pressure Oxidation . Technology at Campbell Mine ...

Pressure Oxidation Pressure oxidation is employed to liberate gold and silver in refractory sulfide concentrates often and ores. The main pressure oxidation products from iron sulfide minerals are sulfuric acid (and metal sulfates) and hematite. Depending on the conditions within the autoclave, acid containing iron compounds can be formed Get Price

 · Santa Fe Pacific Gold Corp. conducted pressure-oxidation pilot plant studies on refractory carbonaceous gold ores from the Twin Creeks …

 · Abstract. Pressure oxidation of gold containing concentrates and ores is an effective pretreatment for liberating refractory gold. This is particularly true when an …

 · The oxidation pretreatment processes mainly include roasting oxidation, pressure oxidation, chemical treatment and biological treatment (Ann et al., 1992; Kou and Chen, 2012; Tongamp et al., 2010; Fernandez et al., 1995; Lin and Zheng, 1996). Among them, the roasting oxidation and pressure oxidation are the more ordinary processes in industry.

FUNDAMENTALS OF PARTIAL PRESSURE OXIDATION OF GOLD BEARING SULPHIDE MINERALS . Ambrosia Maria Ivana BE (Chemical Engineering) A thesis submitted for the degree of Doctor of Philosophy at The University of Queensland in April in 2020 School of Chemical Engineering

 · In this paper, pressure oxidation leaching in sulphuric acid system (POLS) followed by hydrochloric acid leaching (HAL) was employed to remove impurities in the …

Outotec can provide a complete pressure oxidation plant including all auxiliary processes for refractory gold sulfide oxidation. Gold is efficiently released from the sulfide …

 · Pressure Oxidation Leaching Experiments The best arsenic extraction was the test with about 47% arsenic extracted at 30 gpl sulfuric acid, 5 grams of solids, 10 gpl Cu 2+, and 160°C for 1 h. Stat-Ease Design Expert software was used for modeling of the POX leach results to determine significant factors and to perform some optimization .

Pressure oxidation, also known as autoclave leaching, was selected as the preffered processing option for the Albazino and Mayskoye refractory gold deposits. This process is particularly well suited for treating refractory ores that give low recovery rates when directly leached with cyanide.

 · 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 …

 · The Fate of the Arsenic Species in the Pressure Oxidation of Refractory Gold Ores: Practical and Modelling Aspects Mineral Processing and Extractive Metallurgy Review ( IF 4.287 ) Pub Date : , DOI: 10.1080/08827508.2022.2030326 Wei Sung Ng 1, Yanhua Liu 1, Qiankun Wang 2, Miao Chen 1, 3 Affiliation ABSTRACT

Gold extraction from such ores require roasting or pressure oxidation or bacterial oxidation prior to cyanidation to destroy the sulfide structure. Arsenical compounds that can form …

The aqueous pressure oxidation of gold bearing arsenopyrite concentrates in alkaline solution was investigated as a function of O 2 pressure and NaOH concentration. Dissolution of gold from the leach residue was accomplished by standard cyanidation. Gold extraction was found to be proportional to the degree of arsenopyrite oxidation.

 · Pressure oxidation is a widely accepted method to treat refractory gold ores. Gold recovery is generally lower from alkaline than acidic pressure oxidation discharge …

 · A common method is pressure oxidation (POX), where the ore is hydrothermally treated at temperatures of 180–220°C for approximately 1 h to oxidize the sulfide component and to render the gold amenable to recovery by leaching (Corkhill and Vaughan 2009; Papangelakis and Demopoulos 1990a ).

 · "Pressure oxidation was selected as the most feasible processing technology for double refractory ores. It is able to achieve gold recoveries of 96% by utilising high temperatures, elevated pressure and …

Gold recovery from refractory carbonaceous ores by pressure oxidation and thiosulfate leaching US5536297 A process for recovering gold in which an ore slurry of refractory sulfidic and refractory carbonaceous ore having preg-robbing characteristics due to the presence of organic carbon is subjected to pressure oxidation in an autoclave .

 · A pilot plant campaign has been conducted by Sherritt Technologies in support of Eldorado Gold Corporation's evaluation of pressure oxidation (POX) technology for the treatment of refractory gold concentrates from the Certej deposit in Romania.

Gold recoveries have exceeded expectations, improving from around 70% prior to the installation of pressure oxidation to above 84%. The project has increased the nominal gold output at Macraes from 120,000 oz/y to 170,000 oz/y. On-going plant optimisation for process parameters is discussed, giving rise to flexibility in gold

The aqueous pressure oxidation of gold bearing arsenopyrite concentrates in alkaline solution was investigated as a function of O 2 pressure and NaOH concentration. …

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 …

 · PURPOSE:To obtain the aimed compound together with carbon monoxide useful as synthetic raw material gas advantageously in producing >=2C hydrocarbons by oxidative coupling reaction of methane, by carrying out the reaction under concentration ...

 · Pressure oxidation of the refractory sulfide/carbonaceous ores has gained world-wide acceptance. Compared with roasting, pressure oxidation yields higher gold extractions from ores or concentrates and …

 · Alkaline pressure oxidation at 160°C, 2413 kPa O2, and 2 M NaOH resulted in about 98% sulfur oxidation and 86% arsenic dissolution. Cyanidation of the leach residue resulted in 82% Au extraction. This value for gold extraction is lower than what is typically achieved by acid pressure oxidation followed by cyanidation.

Autoclave pressure oxidation (POX) is an effective pre-treatment option when extracting gold from refractory ore bodies, such as pyrite and arsenopyrite. While gold processing plants are the most common utilizers of POX technology, the process can also be applied to other metals, like copper, zinc and uranium.