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The relationship between the high-temperature chlorination efficiency of gold and roasting temperature was established. The high-temperature chlorination reaction of gold was controlled by the interfacial chemical reaction. The apparent activation energy of the high-temperature chlorination of gold is calculated to be E = 20.3 kJ/mol.
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In this work, a chlorination roasting method for the extraction of precious metals (gold and silver) from the cyanide tailings (CT) was investigated. The decomposition mechanism of the CaCl 2 used as chloride agent …
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Semantic Scholar extracted view of "Experimental process analysis and mathematical modeling for selective gold leaching from slag through wet chlorination" by Antoneta Filcenco – Olteanu et al. ... This study showed the kinetics of gold chlorination leaching from an anode slime complex containing copper, silver, barium, selenium, and ...
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The copper–gold slags were processed by disintegration followed by other chemical or physico-chemical transformations, which significantly affected the subsequent slag's processing operations. First of all, the slag was crushed and sieved three times. First two crushing steps were performed using a jaw crusher (BB 200 Retsch).
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the high-temperature chlorination of gold were investigated [18–20]. Hager and Hill [21] and James and Hager [22] reported the chlorination behavior of gold at low temper-ature and the thermodynamics of gold chlorination reaction in the Au–Cl system. Iron was effectively recovered from cyanide tailings by reduction roasting-magnetic separation
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The extent of gold dissolution is approximately 91%, including a 1-% loss of soluble gold in the slurry sent to tailings, for an overall recovery of 90%. Sodium cyanide solution (30%) is added as required in the C.I.L. tanks, one through five, at a rate of one pound of NaCN per ton of dry ore.
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A common refining method is chlorination, where the doré bars are melted, and chlorine gas is bubbled through the molten metal. The chlorine reacts with impurities …
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When dry chlorine gas is made to act in the cold upon finely-divided gold, it converts the latter with evolution of heat into auro-auric chloride, Au2Cl4, a hard, dark-red, hygroscopic salt. Moisture splits this salt into aurous and auric chloride, Au2Cl4 = AuCl + AuCl3 ; treatment with water converts it into auric chloride and ... Gold …
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K i0, α i and θ i were calculated by solving equations (9) and (10), using a Matlab script, and fitting equation (8) to the experimental polarization curve shown in Fig. 4 for 900 rpm. The rate ...
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At present, gold mines are increasingly scarce in the world. The yield of cyanidation tailing (CT) of refractory gold ores with a grade of 10 g/T is huge; however, the effective capitalization of the cyanidation tailing is a significant problem in the gold industry. In this work, a new treatment method, a microwave-roasting process developed. The effect of …
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Contribute to brblmd/sbm development by creating an account on GitHub.
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Chlorination was extensively used in gold extraction in the late 19th century until the development of cyanidation, a more economical process with a higher stability …
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As shown in Fig. 2, chlorine species change with pH.That is, at pH < 3.5, pH > 8 and 3.5 < pH < 8, Cl 2, ClOˉ and HClO are the dominant species, respectively. Fig. 1, Fig. 2 show that [AuCl 4]ˉ exists stably in the range of pH<7.8, and at this time, the dominant specie of chlorine oxidant is Cl 2 or HClO. Thermodynamically, HClO is more …
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Gold leaching is a fundamental process in the extraction of gold from ores. It involves dissolving gold from its ore using a chemical solution, commonly known as a leach reagent. The gold leaching process has been extensively studied and refined over the years to improve efficiency and minimize environmental impact.
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Section snippets Thermodynamic study of gold chlorination leaching reactions. The standard electrode potential of the gold is as follows: Au + + e = Au; E 0 = 1.691 V Au 3 + + 3 e = Au; E 0 = 1.498 V Gold is a metal with a high electrode potential and a low activity and exists mainly in a natural gold state in nature.
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The dried gold sand is melted in a furnace and cast into bars. Depending on the capacity of the Gold Refinery installation, casting of 400 troy ounces (~12 kg) fine gold bars is done either manually by using a removable crucible and a casting table or by using a Gold Bar Casting Wheel. The gold bars are then cooled in a water bath.
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Gold Flotation Equipment Flotation Cell Yes, I am interested!. Gold ores finer than 10 μm are difficult to recover by gravity separation. Froth flotation utilizes the hydrophobicity of gold to separate it from gangue, thereby recovering fine-grained and ultra-fine-grained gold particles.
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The experiment involved primary crushing of the ore, primary and secondary grinding, leaching and chemical analysis. ... (Panias and Neou-Syngouna, 1990; Deng and Li, 1987). Dunn (1982) and Dunn et al. …
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The use of revolving barrels for chlorinating ores was perhaps suggested by the old Freiberg method of barrel amalgamation. It has already been mentioned, p. 239, that Dr. Duflos used a revolving barrel in some of his experiments at Breslau, in 1848, and obtained results almost identical with those given by the vat percolation method. ...
Tests made on ore containing $9 gold, 3.5% copper, and 45% insoluble, showed that after crushing to pass 60 mesh and treating by direct flotation, an extraction of 82% of the gold and 96% of the copper could be obtained, with a concentrate containing only 21% insoluble.
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Therefore the dissolution rate determining step is the gold-chlorine reaction, which is much faster than for other reagents, in particular non-halogens (Fig. 11). This is approved by the linear ...
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Extracting gold from tailings means continually recovering valuable gold from the gold processing plant tailings. With the increasing requirement of environmental protection, the resource utilization of cyanide tailings has become an urgent problem for enterprises. There is a certain amount of gold in cyanide tailings.
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In contrast to conventional pyrometallurgical chlorination of crude bullion with subsequent electrolytic refining (Miller and Wohlwill processes), our technology offers very high …
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Used in a conventional CIP/CIL circuit, gravity devices generally offer benefits by reducing gold held in the system, reducing carbon handling costs and reducing losses due to …
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The Munktell Chlorination Process This method was devised by W. Munktell, who seems to have worked it out without having visited either the vat or the barrel chlorination works already established in other parts of the world. The process enjoys the distinction, according to the published accounts, of having been worked at a profit.
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Investigation on the recovery of gold from pretreated cyanide tailings using chlorination leaching process Haoyu Li a,b,c,d, Shaohua Yin, Shiwei Li, Libo Zhang, Jinhui Peng a,b,c,d, and Kun ...
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By the end of the 19th century some mines with very refractive ores were installing chlorination plants. The process replaced the system of fine crushing the pyrites …
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The process of crushing or decomposition before gold leaching is called pretreatment of refractory gold. Statistics show that, in the world, about 2/3 gold resource ... chlorination roasting, salt sulfur fixation and arsenic roasting are developed on the base of t-he tra-ditional process. * Corresponding author: E-mail: mystery.lian@163 ...
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In metallurgy, the operation of roasting, as a preliminary to chlorination, has for its object the expulsion of the sulphur, arsenic, antimony and other volatile substances existing in the ore, and the oxidation of the metals left behind, so as to leave nothing (except metallic gold) which can combine with chlorine when the ore is subsequently treated …
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sbm chlorination in processing gold oreLeaching of an oxide gold ore with … An oxide gold ore was subjected to chloride hypochlorite leaching at room temperature.The effects of three factors,including Ca(OCl)2 vs.NaOCl,OCl − −
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The results of this study allow to conclude that it is possible to recover gold from alluvial materials by an alternative process such as chlorination, preventing …
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