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— A typical challenge encountered on most gold processing plants during leaching of refractory ores is the reduction in recovery due to the presence of carbonaceous matter which preg robs dissolved…
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— The experiments were made under favorable conditions for cyanidation which included continuous agitation in alkaline cyanide solution in the presence of excess air The time of treatment was 24 hours and the ratio of solution to ore was 10 to 1
— Cyanidation tailings often contain a certain amount of gold which is difficult to recover due to the influence of associated minerals In this article lead oxide was used to increase leaching efficiency and decrease sodium cyanide consumption The mechanism of lead oxide enhanced gold leaching was studied by thermodynamic
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— Semantic Scholar extracted view of "Comparative study of oxidants in gold cyanidation A molecular picture" by H Nourmohamadi et al Skip to search form Skip of ferric ion with 001 S and 001 M surfaces of chalcopyrite M = Fe and Cu Electrochemical insights from DFT calculations H Nourmohamadi M Esrafili V Aghazadeh Chemistry
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— Extraction of gold and silver in the selective chlorination roasting process of cyanidation tailing Haoyu Li State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and Technology Kunming Yunnan P R China;Faculty of Metallurgical and Energy Engineering Kunming
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— Prior to cyanidation tests the selected pyrite powder fraction was treated in different isothermal roasting environments air He CO 2 He/steam at atmospheric pressure in a high heating rate induction furnace UltraFlex Power Technologies USA The bench scale roasting unit consists of a stainless steel reactor ID 34 mm length 70 cm
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— and 5 passivation of 3 Poor cyanidation results are often obtained when sulfide minerals are present in gold Common sulfide minerals associated with gold ores are pyrite pyrrhotite marcasite copper sulfides and arsenopyrite The presence of sulfide minerals has a negative effect on gold cyanidation through
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In practice a high level of cyanide has been maintained rather than a high dissolved oxygen level in solution [9] As a result the majority of the mills operate at cyanide levels such that gold dissolution depends on the level Many attempts have been made to define the rate equation of gold cyanidation in gold ore processing
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— Principles of Gold Cyanidation Explained What is commonly known as the Cyanide Process has for its object the commercially profitable recovery of gold and silver from their ores and this is accomplished by the solvent action of an alkaline cyanide solution on the precious metals
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— However lead can adversely influence on the gold cyanidation under certain conditions The gold cyanidation kinetics of sample 2 was probed using CV method at various lead loadings As presented in Fig 7 the current density decreased with an increase in the lead dosage over the first and second peak regions
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Semantic Scholar extracted view of "Chapter 26 Advances in the Cyanidation of Gold" by G Deschênes Skip to search form Skip to main content Skip to account menu Semantic Scholar s Logo Search 220 312 728 papers from all fields of
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— Since the birth of cyanidation it has been dominant in the gold extraction industry Recently with the increasing awareness of environmental hazards and potential risks posed by the severe toxicity of cyanide attempts to seek alternative lixiviants have arisen Over the past three decades a sign
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— The experiments were made under favorable conditions for cyanidation which included continuous agitation in alkaline cyanide solution in the presence of excess air The time of treatment was 24 hours and the ratio of solution to ore was 10 to 1
— Semantic Scholar extracted view of "Comparative study of oxidants in gold cyanidation A molecular picture" by H Nourmohamadi et al Skip to search form Skip of ferric ion with 001 S and 001 M surfaces of chalcopyrite M = Fe and Cu Electrochemical insights from DFT calculations H Nourmohamadi M Esrafili V Aghazadeh Chemistry
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— One such short cut method is detailed in the AIME Paper entitled Continuous Counter Current Decantation Calculations by T B Counselman Volume 187 February 1950 Other sources of good information are in the Handbook of Cyanidation by Hamilton and Cyanidation Concentration of Gold and Silver Ores by Dorr and Bosqui
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— The production index of gold cyanidation leaching process has important influence on the economic benefits of the plant wide hydrometallurgical process In the actual leaching production process
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— In the cyanidation process lime can be used as a de pharmaceutic agent for the gold concentrate cyanide plant before the immersion thickener to remove harmful substances prevent the occurrence of gold concentrate run off phenomenon and reduce unnecessary losses; As a pre alkali dipping agent it is used to eliminate the unfavorable
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— For decades the cyanidation process is frequently used for gold and silver extraction as well as metal extraction as a sub product of lead zinc and copper metallurgy
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PDF On Jun 1 2017 Mahir C Cetin and others published Bottle Roll Testing for Cyanidation of Gold Ores Problems related to Standardized Procedures on Difficult to Process Ores Find read
— Semantic Scholar extracted view of "Comparative study of oxidants in gold cyanidation A molecular picture" by H Nourmohamadi et al Skip to search form Skip of ferric ion with 001 S and 001 M surfaces of chalcopyrite M = Fe and Cu Electrochemical insights from DFT calculations H Nourmohamadi M Esrafili V Aghazadeh Chemistry
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— The oxidation roasting pretreatment process which is a mature and dominant industrial practice for treating complex polymetallic gold deposits has a low recovery of associated silver and exhibits an unclear reaction sequence This study takes a silver containing gold ore as the research object and investigates the effect of i sodium
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— Cyanidation 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
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— The experiments were made under favorable conditions for cyanidation which included continuous agitation in alkaline cyanide solution in the presence of excess air The time of treatment was 24 hours and the ratio of solution to ore was 10 to 1
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— McCreadie et al 1998 studied the composition of residues from a pressure oxidation facility that had been co disposed with dolomite rich flotation tailings following cyanidation for gold recovery They found that most of the arsenic was present as crystalline ferric sulfarsenate a ferric sulfate arsenate with some associated iron oxides and
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— The DFT method has proven to be one of the most accurate methods for the computation of the electronic structure of solids Perdew et al 1996 Zhao and Truhlar 2008 Nourmohamadi et al 2021 All the calculations were performed with the Perdew Burke Ernzerhof PBE functional for gold crystal structure and 111 surface and
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— can be recovered by gravity flotation or cyanidation High gold recovery >90 per cent is expected and can generally be achieved when gold occurs as coarse grains such as these However gold leaching by cyanidation is a slow diffusion controlled reaction and large gold particles can take many days to fully dissolve
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— The selective chlorination of cyanidation tailing for the extraction of gold and silver investigated The reaction operated at different conditions and studied their effect on the extraction of Au
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