· The resource utilization of cyanide tailings has significant environmental and economic benefits. The efficient recovery of gold from low-grade cyanide tailings containing 1.71 g/t Au was performed by a chlorination roasting–flotation process. The effects of roasting temperature, calcium chloride, internal coke, external coke, copper sulfide
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· A complete process of gold recovery from sulfide refractory gold ore was proposed. • The recovery efficiency of Au was increased by adding pyrite during the chlorination roasting. • The maximum recovery efficiency of gold reached 98.06% under optimal condition.
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· The use of chlorine as an agent for the extraction of gold from ores was first suggested by Dr. John Percy, F.R.S., at the Swansea meeting of the British Association, in a paper embodying the results of experiments carried out later. Simultaneously, Prof. C. F. Plattner, Assay Master at the Royal Freiberg Smelting Works, applied chlorine <a
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: Emilia Neag, Eniko Kovacs, Zamfira Dinca, Anamaria Iulia Török, Cerasel Varaticeanu, Erika Andrea Le · Chloride–hypochlorite leaching and hydrochloric acid washing in multi-stages for extraction of gold from a refractory concentrate. Hydrometallurgy 2014, 142 , 56-59.
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· Cyanide tailings produced in gold smelting process contain a large number of heavy metals and cyanides, which are more and more harmful to the environment. In order to reduce environmental pollution, valuable metals from cyanide tailings are recovered. The amount of calcium chloride, chlorination time, the way of adding calcium chloride
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· has been dominant in the gold extraction industry. Recently, with the increasing awareness of Chlorination or reduction roas ting has been developed for detoxification and recovery of iron
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· PDF | Recently, preoxidation is an efective pretreatment method of refractory gold ore, which has been widely used due to the high gold extraction and co-precipitation of arsenic with iron
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The Extraction of Gold by Amalgamation and Chlorination 19 The timber was then ignited at the bottom and as the burnt quartz settled down to the hearth it was quenched with water and shovelled into trucks that were then wheeled to the stampers. 11 This was designed to be a continuous process to make the ore more
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The Newbery-Vautin chlorination process is a method for extracting gold from its ore through the use of chlorination.This process was jointly developed by James Cosmo Newbery and Claude Vautin. Background The process of extracting and reducing gold from pyrite in gold ores using chlorine gas was initially introduced by Karl Friedrich Plattner
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Firstly, the dissolution rate of gold during chlorination is much faster than with cyanidation. Secondly, carbonaceous ores are more amenable to chlorination. Finally, the reagent cost (1.5 $/t
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· Li et al. [20] also used the chlorination roasting method to extract gold and silver from cyanide tailings and found that after the recovery rate of gold and silver was up to 91.6% and 54.7%
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· PDF Dunn (1982) and Dunn et al. (1991) have extracted gold by chlorination using pyrometallurgical processes at temperatures lower than the ones mentioned above, from refractory minerals and alloys, with a previous roasting process. The objective of this research was, on one hand, to study gold extraction from an alluvial material, through a
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ABSTRACT The selective chlorination of cyanidation tailing (CT) for the extraction of gold and silver has been investigated. The reaction operated at different conditions and their effect on the extraction of Au and Ag was studied. The mineral samples were characterized by fire assay, X-ray diffraction (XRD), X-ray fluorescence (XRF) and scanning electronic
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The cyanide process, also developed at this time, was very efficient in extracting gold from mill tailings but less efficient with pyritic ores containing small amounts of impurities such
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: M.W. Ojeda, E. Perino, M. del C. Ruiz · Recently, Ahtiainen and Lundstrom studied cyanide-free gold leaching in mild chloride media obtaining a gold extraction of 72% at a redox potential <520 mV vs.
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· Pyrite enhanced chlorination roasting was first proposed and used to extract gold and silver from gold tailing by our team. We have designed several experiments, with the purpose to verify the effectiveness and mechanism of pyrite enhanced chlorination roasting.
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· The highest gold extraction yield (98%) was obtained after 6 hours at ambient temperature, solid/liquid ratio (w/v) 1:2 and 4M HCl. In order to explain experimental results a mathematical model of
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: Zhenxing Xing, Gongjin Cheng, He Yang, Xiangxin Xue, Pingguo Jiang · The objective of this research was, on one hand, to study gold extraction from an alluvial material, through a pyrometallurgical process, using chlorine gas as a
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· The gold extraction rate for raw gold ore under optimum conditions (0.25 M potassium bromate, 0.08 M ferric chloride, 0.4 M hydrochloric acid, extraction time of 5 min, stirring speed of 250 rpm
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· Chlorination. Three alternative chloride sublimation-based gold extraction techniques were used: two with elemental chlorine and one with calcium chloride. The tests were carried out in a standard vertical muffle furnace with Kanthal (FeCrAl) heating element (length 250 mm, width 250 mm, height 300 mm).
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· Then, the chlorination roasting experiments were run for a Hong-jun WANG, et al/Trans. Nonferrous Met. Soc. China 30(2020) 1111−1123 1114 Fig. 3 Flow sheet of simultaneous extraction of gold and zinc by chlorination roasting (a), and flow sheet of verification
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DOI: 10.1016/J.POWTEC.2019.07.037 Corpus ID: 199078995 The separation of gold and vanadium in carbonaceous gold ore by one-step roasting method @article{Wang2019TheSO, title={The separation of gold and vanadium in carbonaceous gold ore by one-step roasting method}, author={Hong-jun Wang and Ya-Li Feng and
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Journal of Australasian Mining History, Vol. 2, September 2004 The Extraction of Gold by Amalgamation and Chlorination By RALPH W. BIRRELL University of Melbourne he gold ores found above the waterline in the Lachlan Fold Belt of south eastern Australia in the 1850s, were free milling, meaning that most of the T gold could be easily separated from
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· 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.
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The extract is transferred to tanks, and the gold precipitated as a powder by addition of zinc. It is then washed out from the bottom of the tanks, dried, and freed from zinc by roasting and fusing. In the electrolytic precipitation of the gold an iron anode and a sheet-lead cathode are employed, the current-density being very low, about 0.5 amp. per sq.
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· In this paper, the extraction of gold from the refractory gold ore is carried out by synergistic action between ultrasound and chlorination-oxidation. The optimum conditions were NaClO concentration of 1.5 mol/L, NaOH concentration of 1.5 mol/L, solid-liquid ratio of 5, ultrasound power of 200 W and sonication time of 2 h.
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Chlorination. The chlorination process of gold recovery relied on gold forming a soluble chloride under the action of chlorine. Chlorination-Concept-Electronic Encyclopedia of Gold in Australia, e-Gold is a biographical, bibliographical and archival database that tells the story of gold through images, stories and multimedia interactives
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· The chlorination leaching method is mainly used in the processing of gold mud and gold refining and is also partially used in the leaching of the gold ore [21–23]. The advantage of chlorination leaching is that the reaction is fast, the cost is low, the process is simple, the pollution is little, and the treatment of waste water is easy.
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· Add your ore to a plastic-tub cement mixer along with 10 pounds of river rock and turn the mixer until the ore is 200 mesh or more. 200 mesh means there are at least 200 particles in one square inch of ore. Remove the river rock, which will still be large. Place the gold ore in the cement mixer. Pour in the hot water, bleach and HCL.
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· The combination of chlorination with roasting for the Au extraction showed that 91.6% of Au was recovered using 4% CaCl 2 , while heating at 1323 K for 2 h [38]. Li studied the gold extraction
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