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Leaching experiments of anode slime were performed with several inorganic acids (HCl, HNO_3 and H_2SO_4) together with thiourea and thiosulfate solution to recover gold and silver.
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Pressure leaching of decopperized copper electrorefining anode slimes in strong acid… 467 leaching was conducted for two hours thereafter the autoclave was cooled down to the room temperature and the leach residue were removed for filtration and washing. Experiments were performed as a full factorial test in order to determine the effect of
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Leaching experiments of anode slime were performed with several inorganic acids (HCl, HNO_3 and H_2SO_4) together with thiourea and thiosulfate solution to recover gold and silver.
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In the precious metals recovery process herein disclosed employing the disclosed novel extracting agent with an anode slime, the process includes in a first stage of leaching the copper anode slime with nitric acid 8-10 M (2 times) for about 2 hours at 85° C., or till a solute is reached at least about 95% by weight of the silver content and efficient oxidization of precious metals, in ...
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In the precious metals recovery process herein disclosed employing the disclosed novel extracting agent with an anode slime, the process includes in a first stage of leaching the copper anode slime with nitric acid 8-10 M (2 times) for about 2 hours at 85° C., or till a solute is reached at least about 95% by weight of the silver content and efficient oxidization of precious metals, in ...
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01-01-2003· The slimes without the copper are then enriched in lead, tin and silver. Many hydrometallurgical processes have been reported for extraction of valuable metals including cyanide leaching (McClincy, 1990) and thiourea leaching.
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leaching copper equipments manufacturer . leaching copper equipments manufacturer; percolation leaching of copper ore; anode slime leaching with thiourea; old » Learn More. Gold Leaching Using Thiourea - Scribd. Gold Leaching Using Thiourea - Download as Word Doc (.doc), PDF File (.pdf), Text file (.txt) or read online.
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The kinetic study of nonoxidative leaching of cinnabar concentrate ore in aqueous hydrochloric acid-thiourea solutions is presented. The dissolution rates were investigated over a temperature range of 60 to 100 °C, at an acid concentration of 0 to 5 M and thiourea concentration ranging from 0.3 to 1.5 M at atmospheric pressure.The dissolution rate is of the second order for thiourea ...
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The kinetic study of nonoxidative leaching of cinnabar concentrate ore in aqueous hydrochloric acid-thiourea solutions is presented. The dissolution rates were investigated over a temperature range of 60 to 100 °C, at an acid concentration of 0 to 5 M and thiourea concentration ranging from 0.3 to 1.5 M at atmospheric pressure.The dissolution rate is of the second order for thiourea ...
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13-02-2019· In order to develop a hydrometallurgical process to recover gold and silver from anode slime resulted from the treatment of copper sludge, leaching experiments of the anode slime were performed by a mixture of HCl and some oxidizing agents (H 2 O 2, NaClO, and HNO 3).Effect of the concentration of oxidizing agents, reaction temperature and time, pulp density and stirring speed on the leaching ...
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The extraction of Au, Ag and Pd from decopperized anode slime by different pretreatments and different lixiviants including cyanide, chloride, thiourea and thiosulfate have been investigated. When oxidizing roasting pretreatment was carried out under the conditions of roasting time 120min and temperature 625 °C, the removal ratios of S and Sb could reach 82.18% and 98.52%, respectively.
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01-09-2018· Anode slime produced in a Korean metal recycling plant, contained gold, silver, copper, nickel, tin and zinc ().In order to recover the gold and silver from the anode slime, the metals in anode slime are dissolved in concentrated hydrochloric acid solutions at 90 °C in the presence of an oxidizing agent (H 2 O 2, HNO 3, NaClO) (Xing and Lee, 2017).
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Leaching of gold and silver from anode slime ... dissolved the gold in the anode slime with thiourea solu-tion, and then gold was recovered by utilizing magnetite nanoparticles.
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A new approach for the treatment of copper electrorefining anode slime based on hydrometallurgical route involving sulfuric acid leaching with additives such as manganese dioxide and sodium chloride has been developed at National Metallurgical Laboratory (NML), Jamshedpur, India. Mineralogical characterization of the anode slime and the residues after various leaching treatments, carried out ...
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Pressure leaching of decopperized copper electrorefining anode slimes in strong acid… 467 leaching was conducted for two hours thereafter the autoclave was cooled down to the room temperature and the leach residue were removed for filtration and washing. Experiments were performed as a full factorial test in order to determine the effect of
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Leaching experiments of anode slime were performed with several inorganic acids (HCl, HNO 3 and H 2 SO 4 ) together with thiourea and thiosulfate solution to recover gold and silver. Gold was not dissolved at all into these inorganic acids in the absence of any oxidizing agents.
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Thiourea can form cationic complex with gold in gold extraction process from copper anode slime. Thiourea consumption levels were also examined during the leaching operations for different leaching parameters, i.e. solution volume, concentration ratio of thiourea/H2O2, pH, leaching …
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01-09-2018· Anode slime produced in a Korean metal recycling plant, contained gold, silver, copper, nickel, tin and zinc ().In order to recover the gold and silver from the anode slime, the metals in anode slime are dissolved in concentrated hydrochloric acid solutions at 90 °C in the presence of an oxidizing agent (H 2 O 2, HNO 3, NaClO) (Xing and Lee, 2017).
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Anode slime leaching with thiourea - yyfqxx.com... An innovative thiourea gold leaching ... for gold leaching. ... Thiourea leaching of a copper-gold ore using statistical design. Results of thiourea leaching Table 2 combines the results and the factorial design of the study.
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1988), where thiourea leaching shows a good potential application to treat sulphide concentrates. A low toxicity of thiourea compared to cyanide is always mentioned as one of the motivations for developing the research in the field. MATERIAL Anode slime samples …
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