In this study, persulfate was activated by ultrasound and used for the oxidation pretreatment of refractory gold ores to remove pyrite inclusions and improve the gold …
DetailsFurthermore, recent studies demonstrated that sodium/potassium hydroxide pre-treatment is a viable technique for the processing of refractory antimonial gold/silver ores containing minerals such ...
DetailsNANTHAKUMAR B, PICKLES C A, KELEBEK S. Microwave pretreatment of a double refractory gold ore [J]. Minerals Engineering, 2007, 20(11): 1109âˆ'1119. [3] CELEPA O, ALPA Ä°, PAKTUNCB D, THIBAULT Y. Implementation of sodium hydroxide pretreatment for refractory antimonial gold and silver ores [J]. Hydrometallurgy, 2011, …
DetailsGold in refractory ores occurs as fine-size gold-bearing sulfide minerals. In this study, the microwave-assisted roasting method has been investigated as a pretreatment for a …
DetailsThe problems during the leaching of gold show the necessity for ore pretreatment to minimize the gold entrapment with refractory minerals and solve the gold low recovery …
DetailsThe gold particles of ALRG gold ore are almost wrapped by pyrite and arsenopyrite, and the direct gold leaching extent is less than 40 %, making it an extremely refractory gold ore. The ore sample in this study has an extremely low gold content of 0.85 g·t −1, iron content of 3.21 %, sulfur content of 2.27 %, and arsenic content of 0.19 …
DetailsTherefore, pretreatment of arsenic-bearing refractory gold has an extremely important significance. 3) In recent years, researches are mainly about the refractory gold leaching easily through arsenic removal to expose gold, changing the composition, physic-chemical and electro-chemical properties of the ore.
DetailsHydrometallurgy 105 (2011) 234–239 Contents lists available at ScienceDirect Hydrometallurgy j o u r n a l h o m e p a g e : w w w. e l s ev i e r. c o m / l o c a t e / h yd r o m e t Improved gold and silver extraction …
DetailsLeach residues at the end of each stage were also analysed for gold XXV INTERNATIONAL MINERAL PROCESSING CONGRESS (IMPC) 2010 PROCEEDINGS / BRISBANE, QLD, AUSTRALIA / 6 - 10 SEPTEMBER 2010 1506 THE APPLICATION OF ROASTING PRETREATMENT FOR ANTIMONIAL REFRACTORY GOLD AND …
DetailsPretreatment and processing of refractory gold ore are becoming increasingly important and an inevitable trend for gold development due to the depletion of high-grade ores (Mabwe, 2020). Extraction of gold from refractory gold ore without any side reactions is a highly desirable process in the future ( Qin, Guo, Tian, & Zhang, 2021 ).
DetailsCelep et al. (2015) showed that, after nitric acid pretreatment, silver associated with arsenic and lead phases in a refractory ore was recovered with 20% improvement in the overall silver extraction.
DetailsHigh-grade refractory gold reserves offer the potential for lower costs per ounce despite higher capital and operational costs. A focus on three action areas can help maximize …
DetailsThe effect of bio-oxidation and neutral atmospheric oxidation pre-treatment of refractory gold concentrates on gold and silver extraction during cyanidation was investigated. A series of pre-treatment experiments was conducted on three high sulfur (> 9%) refractory concentrates with 0.92–1.25 g/t gold and 64–90 g/t silver. Cyanidation …
DetailsIn this work ozonization was studied as pretreatment for two Mexican refractory ores in order to increase the gold and silver extraction. Two methods for contacting ozone with the mineral were studied (indirect and direct).
DetailsSulfide minerals (i.e., pyrite, arsenopyrite, chalcopyrite), major gold carriers in refractory gold ores, however, hinder gold extraction due to the high consumption of a lixiviant. In …
DetailsIn this paper, a new process of concentrated sulfuric acid curing pretreatment combined with copper ammonia thiosulfate solution leaching test was proposed to extract gold …
DetailsThe application of roasting pretreatment for antimonial refractory gold and silver ores, XXV. International Mineral Processing Congress, Brisbane, Australia, pp. 1505–1510. Celep, O., Alp, İ., Deveci, H., 2011. Improved gold and silver extraction from a refractory antimony ore by pre-treatment with alkaline sulphide leach.
DetailsRecovering 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 …
DetailsIn order to maintain the sustainable use of gold resources, effective pre- treatment and processing of complex gold ores is urgently required. This project aims to review on the techniques currently being employed in order to determine research gaps for sustainable processing of refractory gold ores. 2. Pre-treatment of Refractory Gold Ores
DetailsTo provide a theoretical basis for a suitable process to extract gold from refractory gold concentrates, process mineralogy on the acid leaching residue of gold calcine was studied by chemical composition, X-ray diffraction, scanning electron microscopy-energy spectrum, and mineral dissociation analysis. The results showed …
DetailsHowever, the treatment of so-called refractory gold ores using cyanidation is problematic and new solutions are needed due to the constant depletion of easy-to-treat gold ores [1, 3]. ... Nitric acid has been used successfully in the pretreatment of gold ores associated with sulfides such as pyrite and arsenopyrite.
DetailsCarbonaceous 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. …
DetailsThe grade and recovery of gold in the flotation concentrates were 49.44 g/t and 33.36%, respectively. The total recovery of gold was 90.94%. The gravity–flotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of gold.
DetailsFollowing pretreatment, refractory gold ores are leached in order to extract gold. Currently, the leaching agents are separated into two groups: cyanide and non-cyanide reagents. In recent years, because of the environmental protection issues and changes in ore properties, the non-cyanide gold leaching process has been one of the …
DetailsThe pretreatment of gold ores before cyanidation is a challenging problem due to the world's annual huge waste of refractory gold minerals. Generally, the leaching of gold by cyanidation without ...
DetailsThe 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.
DetailsDOI: 10.1016/J.HYDROMET.2014.03.007 Corpus ID: 93717030; Influence of potassium hydroxide pretreatment on the extraction of gold and silver from a refractory ore @article{Alp2014InfluenceOP, title={Influence of potassium hydroxide pretreatment on the extraction of gold and silver from a refractory ore}, author={İbrahim Alp and Oktay …
DetailsIn summary, the thermal activation pretreatment of refractory sulfide gold ore generates a sufficient amount of thiosulfate for environmentally friendly gold green extraction, serving as a potential alternative to traditional chemical sodium thiosulfate. Notably, this innovative clean and efficient technology prevents sulfur and arsenic from ...
DetailsThe 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, however, hinder gold extraction due to the high consumption of a lixiviant. In this study, a new method to improve gold …
DetailsCyanidation is the main process in gold leaching. There are several parameters that affect gold recovery and cyanide consumption. In this paper, the effect of the oxidative pretreatment and lead nitrate addition on the cyanidation of Zarshuran refractory gold ore containing 3.32 ppm Au, 1.09% As, and 0.5% sulfur were …
DetailsFor refractory gold ore pretreatment, ultrasound activation and heat activation are considered the most suitable option for industrial requirements. These methods not only enhance reaction efficiency but also create local "hot spots" and cavitation free radicals through ultrasound, further promoting oxidation efficiency, breaking down ...
DetailsPotassium hydroxide alkaline pretreatment of a refractory gold–silver ore containing 20 g/t Au and 220 g/t Ag was investigated with the purpose to evaluate its effectiveness on the extraction of gold and silver.The presence of antimony minerals such as stibnite (Sb 2 S 3), zinkenite (Pb 9 Sb 22 S 42) and andorite (Sb 3 PbAgS 6) is the …
DetailsRefractory gold ore is usually affected by the associated carbonaceous matter through the preg-robbing effect, which is eliminated by oxidation roasting, followed by leaching, to …
DetailsGold, a signicant precious metal, has high corrosion resist-ance, excellent electrical and thermal conductivity []. In 1 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
DetailsThe low-grade antimony refractory gold ores in this experiment were produced from Shandong province of China. After grinding to fine size ensuring 98% of the ore particles are less than 74 µm, the chemical composition, phases and microscopic morphology of the ores were characterized by chemical analysis, Inductively Coupled …
DetailsKEY WORDS: arsenic-bearing gold ore; pretreatment process; refractory gold ore. 1. Introduction Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding.1) Arsenic-bearing refractory gold ore has stones extremely difficult to deal with. In the stones,
DetailsHence, the use of refractory ores has been increased during the recent years. In general, gold refractory ores are classified into carbon, sulfide and tellurium ores. Among the refractory ores, the sulfide type is …
DetailsThe 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 and barite, and to a lesser extent, sulphides such as pyrite, stibnite, sphalerite, zinkenite (Pb 9 Sb 22 S 42) and andorite (Sb 3 PbAgS …
DetailsPE series jaw crusher is usually used as primary crusher in quarry production lines, mineral ore crushing plants and powder making plants.
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