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Luckily, the gold contained in refractory ores is not unsalvageable. Gold's resistance to oxidation is a critical point of most refining and extraction methods, and the roasting process is no exception. During roasting, refractory gold ore is treated with extremely hot air.
The influences of various factors (ammonium persulfate concentration, potassium iodide concentration, pH, and leaching time) on the gold extraction rate were studied, and the …
Refractory gold ores are typified by the presence of either ultra-fine gold particles disseminated throughout the gold bearing mineralization, or, gold in solid-solution within the mineral matrix. Common refractory gold bearing minerals include arsenopyrite, pyrite and copper sulphides, which are highly resistant to extraction by standard ...
Moreover, leaching this roasted gold ore resulted in gold extraction of 92.5%; however, leaching of refractory gold without pretreatment resulted in gold extraction of only 47.5%. Oxidation mechanism of pyrite in a thiosulfate solution: electrochemical impedance (EIS) and in situ Raman spectroscopy
The most promising results were obtained utilizing solution with sodium sulfite and sodium sulfate concentration of 25 g/L and leaching time – 1 hour. Under these conditions, the extraction of gold was 67%. The use of sodium sulphate and sodium sulfite allows to extract gold and partially silver from refractory sulfide ores.
As a result, a gold extraction rate of 80.2% was achieved for this refractory sulfide gold ore without the addition of chemical thiosulfate. This innovative technology is of high academic and industrial interest, addressing the high thiosulfate consumption and promoting the industrialization of green gold extraction from refractory sulfide gold ...
the eld of gold extraction and smelting, refractory gold ore is one of the most important gold resources at present [2]. Approximately 30% of the world's gold production is derived from refractory gold ore, and this proportion is expected to increase even further in the future []. For 3 refractory gold concentrates containing sulfur and arsenic,
The use of thiosulfate to extract gold from refractory ores is promising because of its non-toxicity and high selectivity. Sulfide minerals (i.e., pyrite, arsenopyrite, chalcopyrite), major gold carriers in refractory gold ores, …
Sulfide gold ores account for a large proportion of refractory gold ores, therefore, it is very meaningful to recover gold from sulfide gold ores (Ubaldini and Vegliò, 2000, Saba, 2011, Hammerschmidt, 2016). Moreover, the major gold leaching process for extracting gold from ores and concentrates is still cyanide leaching.
Hypochlorite leaching system is a strong oxidizing solution for metal sulfides, which are naturally associated with gold extraction. This study evaluated the hypochlorite leaching of refractory gold ore by using the response surface method–central composite design (RSM-CCD) as a statistical approach in determining the optimum condition of gold extraction from …
cyanidation. Acceptable extraction of refractory gold can only be achieved by employing a pre-oxidation process prior to cyanide leaching. Antimony, bismuth sulfide and telluride gold ores: Antimony, bismuth sulfide and telluride gold ores are often somewhat refractory due to the presence of slow-dissolving gold minerals such as aurostibite ...
A synergistic extraction method for gold from the refractory gold ores via ultrasound and chlorination-oxidation was developed. The effects of solid-liquid ratio, extraction time, ultrasound power, NaClO concentration and NaOH concentration on the extraction rate of gold from the refractory gold ore were investigated.
1. Introduction. The efficiency of gold extraction from sulphidic refractory ores (e.g., arsenopyrite (FeAsS) and pyrite (FeS 2)) by direct cyanidation is usually very low (Badri and Zamankhan, 2013, Faraz et al., 2014), since fine gold particles in these ores are mostly locked up in the bulk and therefore inaccessible to leaching agents and dissolved oxygen (Badri and …
Gold, a significant precious metal, has high corrosion resistance, excellent electrical and thermal conductivity [].In the field of gold extraction and smelting, refractory gold ore is one of the most important gold resources at present [].Approximately 30% of the world's gold production is derived from refractory gold ore, and this proportion is expected to …
cyanidation. Acceptable extraction of refractory gold can only be achieved by employing a pre-oxidation process prior to cyanide leaching. Antimony, bismuth sulfide and telluride gold ores: …
The complex mineralogy of the Porgera resource has a pronounced effect on process selection for the recovery of refractory gold and silver. Intimate association of gold with pyrite necessitates a high degree of sulphur preoxidation to achieve acceptable levels of gold recovery. Acid pressure oxidation has been demonstrated to be the only commercially proven process …
Gold, a significant precious metal, has high corrosion resistance, excellent electrical and thermal conductivity [].In the field of gold extraction and smelting, refractory …
A good amount of fire methods and wet processes have shown potential for gold extraction from refractory resources (Chakraborti and Lynch, 1983; Linge, 1995; Espiell et al., 1986). While, several reasons have arisen for the preference of a wet way, including growing energy costs and carbon relieving pressure. As it is well known, a wet method ...
Many gold deposits contain finely disseminated gold particles in iron sulfide minerals such as pyrite. These minerals are called refractory gold ores because of the presence of gold, which occurs either as disseminated …
A systematic review of gold extraction: Fundamentals, advancements, and challenges toward alternative lixiviants. Author links open overlay panel Zuo-wei Liu a, Xue-yi Guo a b, Qing-hua Tian a b, Lei Zhang a b. ... The sample was generated from a refractory gold concentrate processed by roasting, containing 54.4 g/t gold with iron oxide and ...
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 cyanidation under …
A large portion of refractory gold is associated with arsenic and, through an alkaline pretreatment, the release of the precious metal can be achieved. However, although gold extraction increases with the release of arsenic, this element severely contaminates the …
In view of the above problems, a novel method for extracting gold from refractory gold concentrate calcine through stepwise extraction by thiourea leaching is proposed in this paper, with its conceptual flow-sheet shown in Fig. 1. During the first leaching stage, the consumption of thiourea can be effectively decreased by adding suitable ...
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. ferrooxidans, and a mixed culture …
Oxidation roasting of refractory gold ore to form a calcine is a common pretreatment method in gold extraction (Qin et al., 2021). Some researchers have carried out the study of non-cyanide extraction of gold from calcine, and …
A synergistic extraction method for gold from the refractory gold ores via ultrasound and chlorination-oxidation was developed. The effects of solid-liquid ratio, extraction time, ultrasound power, NaClO concentration and NaOH concentration on the extraction rate of gold from the refractory gold ore were investigated.The optimum conditions were as follows: …
A novel process based on chlorination roasting was proposed to simultaneously recover gold and zinc from refractory carbonaceous gold ore by using NaCl as chlorination agent. The effects of roasting temperature, roasting time and NaCl content on the volatilization rates of gold and zinc were investigated.
It has been suggested that refractory gold reserves, which require more sophisticated treatment methods in order to achieve oxide-ore recovery rates, correspond to 24% of current gold reserves and 22% of gold resources worldwide. ... and most is located in regions with a long history of gold exploration and mining, as well as a lower investment ...
Cyanidation is the most widely used industrial process for the recovery of gold and silver from ores and concentrates. But, difficulties encountered in the dissolution of refractory ores, public paranoia associated with the toxicity of cyanide and the environmental limitations imposed on cyanide disposal are the basic disadvantages of the process.
DOI: 10.1016/J.MINENG.2019.02.037 Corpus ID: 109159359; Extraction of gold from refractory gold ore using bromate and ferric chloride solution @article{Wang2019ExtractionOG, title={Extraction of gold from refractory gold ore using bromate and ferric chloride solution}, author={Qiang Wang and Xianzhi Hu and Futing Zi and Xuecong Qin and Yanhe Nie and Yan …
