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May 01, 2005Due to poor cyanide selectivity for gold over the enclosing sulfide mineral matrix, such parasitic reactions inflict utility extra costs and profit losses resulting from high levels of
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The optimum pH and dose of hydrogen peroxide for complete cyanide removal in the presence of 30 mg/L copper sulfate as a catalyst were determined as 9.7 and 9.98 g/L, respectively. At high temperatures 35C, cyanide was completely removed perfectly at constant pH = 9.7 which was mainly due to cyanide evaporation in the form of HCN.
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Jul 01, 2011A capillary electrophoretic (CE) protocol was developed for the separation and quantification of free cyanide and zinc cyanide complex, two key species in gold cyanidation of zinc-bearing sulfidic ores. Several common carrier electrolytes were implemented in an indirect UV detection method.
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Activity of aurothiomalate is only shown in animals which received thiocyanate. Hydrogen cyanide is a constituent of cigarette smoke and the aurocyanide formed by the interaction with gold complexes and inhaled hydrogen cyanide rapidly diffuses
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Jan 24, 2012Azizi et al. (2011 Azizi et al. (, 2012a investigated galvanic interactions in ZRA mode, between gold and sulphidic gold ores/minerals using packed bed electrochemical reactor (PBER) using
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The high reactivity of sulfide minerals in alkaline cyanide solutions makes gold cyanidation a multifactorial process controlled by the mineralogy of the host rock and where gold recovery is a complex outcome from gold surface passivation, galvanic interactions between the conducting phases (i.e., Au-sulfide and sulfide-sulfide) present in multi-sulfidic ores
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Feb 01, 2012The role of multi-sulfidic mineral binary and ternary galvanic interactions in gold cyanidation in a multi-layer packed-bed electrochemical reactor. Author links open overlay panel Abdelaaziz Azizi a b Catalin Florin Petre a 1 Gnouyaro Palla Assima a However, gold leaching from mixed multi-mineral systems where multi-factorial galvanic
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Gold cyanidation revisited -- Kinetic electrochemical studies of gold -- Sulfidic ore mixed/multilayer fixed beds; Authors: Azizi, Abdelaaziz: Advisor: Larachi, Facal; Petre, Cătălin Florin:
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By Abdelaaziz Azizi Abstract Pour dchiffrer le rle de minerais sulfureux sur la cyanuration de l'or, une tude dtaille sur l'importance relative des phnomnes de passivation (PP) et d'interactions galvaniques (IG) a t mene dans le prsent travail de thse.
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Mar 31, 2016Analysis for free Cyanide: (1) Pipette a 10 ml (K or Na) cyanide sample into a 250 ml erlenmeyer flask. (2) Add 90 ml of distilled water. (3) Add: a) Nothing, if no indicator is to be used, or. b) 5 ml of 10% KI (potassium iodide) solution, or. c) 5 ml rodanine.
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Gold is not active metals, in the process of cyanide leaching, gold can be under the action of oxygen and cyanide complexation reaction CN, produce a watersoluble melamine aurous acid salt complex [Au CN 2], so the cyanide agent is a key factor determine gold dissolved, in general, to ensure that a certain amount of free cyanide in the
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Jul 30, 2014The high reactivity of sulfide minerals in alkaline cyanide solutions makes gold cyanidation a multifactorial process controlled by the mineralogy of the host rock and where gold recovery is a complex outcome from gold surface passivation, galvanic interactions between the conducting phases (i.e., Au-sulfide and sulfide-sulfide) present in multi-sulfidic ores and
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CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): biosorption with L-cysteine
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Abstract A capillary electrophoretic protocol for the separation and quantification of the most important species potentially liberated during the cyanidation of gold sulfide-rich ores was accompli
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Cyanidation is leaching of gold ores with NaCN leaching agents and the presence of oxygen Cyanidation kinetics follow the rate of dissolution kinetics Habashi The factors affecting the rate of reaction is Cyanide concentration, pH, temperature, oxygen pressure, and foreign ions 5/2/2012 fReferences 23 Habashi, F., 1997.
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NuFortune is Australia's largest cyanide mining producer offering clean eco-friendly mining, innovative gold extraction purification services. IMPORTANT NOTICE: NuFortune Group Limited ABN 610 805 555 Under Voluntary Administration. ABOUT US; OPERATIONS. Radio Gold Mine;
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Cyanide leaching was first applied to extract gold from pyritic ore, which prior to the discovery of gold cyanidation could not be extracted. This led to heavy investment in mining in the 1890s and the opening of larger gold mines. Leaching gold with cyanide is still a widely used hydrometallurgical process in today's mining industry.
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Apr 29, 2021For example, Barrick Gold Co. — one of the largest gold mining companies in the world — was required to invest a surplus of nearly $500 million in 2018 to compensate for 3 cyanide spills in 3
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May 19, 2011Capillary electrophoretic analysis of sulfur and cyanicides speciation during cyanidation of gold complex sulfidic ores. Petre CF, Azizi A, Olsen C, Bacaoui A, Larachi F. J Sep Sci, (22):3902-3910 2008 MED: 19009541
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May 19, 2011DOI: 10.1002/jssc.201100095 PMID: 21595027 Abstract A capillary electrophoretic (CE) protocol was developed for the separation and quantification of free cyanide and zinc cyanide complex, two key species in gold cyanidation of zinc-bearing sulfidic ores. Several common carrier electrolytes were implemented in an indirect UV detection method.
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Jun 24, 2015Gold and Silver Leaching. For Gold and Silver, the most common leachants used are Na or K cyanides in the presence of oxygen, Thiourea (NH 2. CS.NH 2), also in the presence of oxygen, or Ammonium polysulphide (NH 4) 2 Sx, especially for Gold. Optimum physical conditions for cyanidation are: Maximum temperature of 85 o C, Operating ph range of 9
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May 19, 2011The best results were obtained using a BGE that contained 35 mM sodium chromate, 12 mM free cyanide and 0.45 mM hexamethonium bromide at pH 10.5. Free cyanide concentration was compared to that measured with the conventional silver nitrate titration method in solutions containing free cyanides and weak cyano-complexes.
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article{Azizi2011UntanglingGA, title={Untangling galvanic and passivation phenomena induced by sulfide minerals on precious metal leaching using a new packed-bed electrochemical cyanidation reactor}, author={Abdelaaziz Azizi and Cătălin Florin Petre and Caroline Olsen and Fa{i}al Larachi}, journal={Hydrometallurgy}, year={2011}, volume
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Dec 01, 2008The robustness of the analytical protocol was tested by analyzing ions speciation during the cyanidation of two gold sulfide-rich ores. The 1-h cyanidation of the two ores released up to six complexes into solution: S2O3(2-), Cu(CN)3(2-),
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CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Gold plating is very commonly used in different areas of techniques, for decorative purposes and corrosion protection. Electrolytes based on cyanide and ferrous cyanide solutions are still present in most of gold plating baths, in spite of large efforts to replace them by some
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CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Gold plating is very commonly used in different areas of techniques, for decorative purposes and corrosion protection. Electrolytes based on cyanide and ferrous cyanide solutions are still present in most of gold plating baths, in spite of large efforts to replace them by some less toxic substance [1].
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Leveraging Strategies to Increase Gold Cyanidation in the Presence of Sulfide Minerals — Packed-bed Electrochemical Reactor Approach - Free download as PDF File (.pdf), Text File (.txt) or read online for free.
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May 21, 2020Globally, copper, silver, and gold orebody grades have been dropping, and the mineralogy surrounding them has become more diversified and complex. The cyanidation process for gold production has remained dominant for over 130 years because of its selectivity and feasibility in the mining industry. For this reason, the industry has been adjusting its
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Jun 25, 2021The sodium cyanide concentration can be adjusted at any time according to the gold concentration of the pregnancy liquid. #2 Spray Cycle The spraying time is generally 7-8 hours a day, and cannot exceed 10 hours at most (but the amount should be reduced). Generally, spray 1 stop 1 or spray 1 stop 2.
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Jun 19, 2021Cyanides are widely used as depressants in the selective flotation of sulphide minerals and as gold solvents in the gold cyanidation process. Despite widespread application of cyanide compounds in the mineral processing industry, they are highly toxic to humans and aquatic organisms. In this research study, two novel and efficient graphene-based magnetic
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Nov 01, 2020The interaction of gold cyanide complex with elemental sulphur and all metastable sulphur species has been studied The stability of a complex is affected by Eh and pH of the solution (Aazami et al., 2014; Azizi et al., 2010). Cyanide has been used for more than 125 years as the main gold lixiviant in industry (Bas et al., 2017). The well
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Dec 01, 2008The robustness of the analytical protocol was tested by analyzing ions speciation during the cyanidation of two gold sulfide-rich ores. The 1-h cyanidation of the two ores released up to six complexes into solution: S2O3 (2-), Cu (CN)3 (2-), SCN (-), Fe (CN)6 (4-), OCN (-), and SO4 (2-).
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