The U.S. Bureau of Mines developed an alkaline oxidative pretreatment to increase the recovery of gold from refractory sulfide ores containing arsenopyrite (FeAsS) and/or pyrite (FeS2).
Semantic Scholar extracted view of "Selective alkaline leaching of antimony from Low-grade refractory gold ores and process optimization" by Feiyu Zhang et al.
The leaching kinetics of antimony from refractory gold ore in alkaline sodium sulfide was investigated under ultrasound. The influence of factors such as stirring speed, temperature, the concentration of sodium hydroxide and sodium sulfide and particle size, was studied.
The influence of pyrite pre-oxidation in alkaline solutions on gold recovery by cyanidation from Twin Creek refractory gold ore in which pyrite was identified as the major sulfide mineral has been ...
The application of pressure oxidation (POX) followed by thiosulfate gold leaching is an efficient method used to extract gold from double refractory gold ores containing both sulfide and carbonaceous matter. This process is expected to result in high gold recovery rates, as it liberates gold from sulfides and eliminates the preg-robbing …
Recovering gold from sulfide refractory gold ore has been an important guarantee for the sustainable development of gold industry, while there are many challenges in the treatment of sulfide refractory gold ore, such as environmental pollution and low gold recovery.
The reaction mechanism of electrochemical oxidation of gold ore in an alkaline electrolyte at pH 10 was studied in this paper. The results suggest that the …
The oxidation of refractory arsenical gold concentrates in aerated alkaline solutions results in the formation of thiosulfate, arsenate and sulfate as well as the …
The ozonation of refractory minerals can improve gold extraction through direct treatment or indirect oxidation. It minimizes gold entrapping with refractory …
Currently, a greater percentage of gold is extracted from low grade, refractory gold ores, following depletion of most high grade deposits [8]. Increasing complexity of these refractory ores warrants improvement in our fundamental and applied knowledge un-derpinning sustainable, cost-effective, commercial gold extraction process and commod-
The latter part of the 20th century saw great advances in the treatment of refractory gold ores coupled with increased reliance with the use of cyanide for gold processing.
The depletion of readily amenable gold ores and discovery of complex deposits inspire knowledge improvement and search of commercially effective technique in extracting gold from refractory gold ores.
dissolution of gold during the alkaline oxidation of refractory gold concentrates; the electrochemistry of gold in alkaline solutions containing thiosulfate or monothioarsenate; the effect of copper on the leaching of gold in alkaline thiosulfate solutions; and the leaching of gold in alkaline solutions with thioarsenites.
The biooxidation of refractory gold ores is a multifaceted procedure that entails the use of microorganisms to oxidize the barriers of recovery and release gold …
Recovering gold from sulfide refractory gold ore has been an important guarantee for the sustainable development of gold industry, while there are many challenges in the treatment of sulfide ...
The upgraded concentrate A, containing the metal and sulfide mineral of interest, is then be fed into the first alkaline agitated oxidation reactor. The present invention is herein illustrated with gold refractory ore, without being limited thereto.
Semantic Scholar extracted view of "Improved gold and silver extraction from a refractory antimony ore by pretreatment with alkaline sulphide leach" by O. Celep et al.
The oxidation of refractory gold concentrates containing arsenopyrite and pyrite and the simultaneous dissolution of gold in aerated alkaline solutions at ambient temperatures and pressures without the addition of cyanide has been studied.
Gold ore from Goldstrike, NV, is a typical refractory gold ore containing sulfide and carbonaceous matter. Alkaline pressure oxidation followed by thiosulfate …
In gold smelting industry, coexisting of arsenic (As) and antimony (Sb) in gold-bearing sludge is a serious issue for the smelting process. This study employed a two-stage leaching methods to selective extract arsenic …
Gold is mainly extracted by cyanidation; however, cyanide is not only highly toxic to organisms but is also not a very effective lixiviant for refractory gold ores. Environmentally friendly leaching agents for gold include thiosulfate, thiourea, polysulfide, lime sulfur, halogens and their compounds, and alkaline amino acids.
Where gold is associated with arsenic, antimony, tellurium, and certain other minerals, it is often only partly soluble in cyanide solution. The difficulty is usually more of a physical than a chemical one but special methods of treatment may be required. Gold Leaching & Processing of Arsenic Ore Mispickel (Arsenopyrite: FeAsS).6 When this …
The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching. The ore assayed 20 g/t Au and 220 g/t Ag and contained predominantly quartz/clay ...
The leaching kinetics of antimony from refractory gold ore in alkaline sodium sulfide was investigated under ultrasound. The influence of factors such as stirring speed, temperature, the ...
Gold deposits associated with alkaline rocks include high-grade, gold-rich epithermal deposits, porphyry-type Cu(Au) and Mo(Au) deposits, and several other deposit types more speculatively linked to alkaline magmatism. These deposits can be large and high grade; several contain >1,000 tonnes Au.
The mechanism and kinetics of alkaline cyanide leaching of gold from two refractory flotation concentrates and their bio-oxidised products, obtained from the Ghanaian gold province have been investigated.
The efect of bio-oxidation and neutral atmospheric oxidation pre-treatment of refractory gold concentrates on gold and silver extraction during cyanidation was investigated.
Pretreatment has been the focus of refractory gold concentrate, and many methods were developed. Pre-oxidation by electrochemical methods is environmentally friendly. The reaction mechanism of electrochemical oxidation of gold ore in an alkaline electrolyte at pH 10 was studied in this paper. The results suggest that the refractory …
The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching. The ore assayed 20g/t Au and 220g/…
The oxidation of refractory gold concentrates containing arsenopyrite and pyrite and the simultaneous dissolution of gold in aerated alkaline solutions at ambient temperatures …
A large refractory gold orebody (RGO) containing arsenopyrite was discovered in the Soviet Eastern block and development was not straightforward because of environmental restrictions. The orebody was overlain with soft oxide ore which was amenable to heap leaching whilst the transition and fresh ore was highly refractory ...
Gold ores that are hard to process via conventional means are termed "refractory". Often, there are undesired components in the ore that block physical contact between gold and …
Improved gold and silver extraction from a refractory antimony ore by pretreatment with alkaline sulphide leach
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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 for releasing refractory gold from pyrite and arsenical concentrates before cyanidation [11,14]. Simultaneous pressure leaching oxidation …
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