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.
These ores are often refractory, as the gold is encapsulated within the sulfide matrix. In order to recover the gold, the host matrix must be destroyed. ... Although there has been little fundamental research into gold leaching in the alkaline sulfide system, there is some knowledge of the chemistry involved as a similar system can be used to ...
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 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 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).
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 ...
The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching. The ore assayed 20g/t Au and 220g/…
Contribute to luoruoping/id development by creating an account on GitHub.
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 …
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, hot …
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 ...
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 biooxidation of refractory gold ores is a multifaceted procedure that entails the use of microorganisms to oxidize the barriers of recovery and release gold …
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.
Pressure oxidation is a widely accepted method to treat refractory gold ores. Gold recovery is generally lower from alkaline than acidic pressure oxidation discharge due to passivation and incomplete oxidation of mineral. Gold ore from Goldstrike, NV, is a typical refractory gold ore containing sulfide and carbonaceous matter. …
Semantic Scholar extracted view of "Selective alkaline leaching of antimony from Low-grade refractory gold ores and process optimization" by Feiyu Zhang et al.
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 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.
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.
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 efect of bio-oxidation and neutral atmospheric oxidation pre-treatment of refractory gold concentrates on gold and silver extraction during cyanidation was investigated.
Gold ore from Goldstrike, NV, is a typical refractory gold ore containing sulfide and carbonaceous matter. Alkaline pressure oxidation followed by thiosulfate …
The oxidation of refractory gold concentrates containing arsenopyrite and pyrite and the simultaneous dissolution of gold in aerated alkaline solutions at ambient temperatures …
The oxidation of refractory gold concentrates containing arsenopyrite and pyrite and the simultaneous dissolution of gold in aerated alkaline solutions at ambient temperatures …
Carbonaceous sulfidic gold ores are commonly double refractory and thus require pretreatment before gold extraction. In this paper, the capacity of pre-bio-oxidation can simultaneously decompose sulfides or deactivate carbonaceous matters (CM) from a double refractory gold ore (DRGO) using pure cultures of A. ferrooxidans or L. …
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.
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 …
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 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.
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 …