양극흙에서 금의 불균일 분포에 따른 영향을 배제하기 위해 금과 은 금속혼합물을 사용하여 염산과 산화제(질산, 과산화수소, 차아염소산나트륨)의 혼합용액, thiourea 및 thiosulfate에 의한 침출실험을 수행했다. 염산에 산화제로 질산이나 과산화수소를 첨가한 용액에서 금은 모두 용해되었으나, 은의 침출율은 1% 정도이었다. Thiourea와 thiosulfate용액에서 금은 전혀 용해되지 않았다. 산성의 thiourea용액에 제 2철이온을 첨가하면 은의 침출율이 상승했으며 제 2철이온과 황산의 복합효과를 규명하기 위해서는 추가 연구가 필요하다.
양극흙에서 금의 불균일 분포에 따른 영향을 배제하기 위해 금과 은 금속혼합물을 사용하여 염산과 산화제(질산, 과산화수소, 차아염소산나트륨)의 혼합용액, thiourea 및 thiosulfate에 의한 침출실험을 수행했다. 염산에 산화제로 질산이나 과산화수소를 첨가한 용액에서 금은 모두 용해되었으나, 은의 침출율은 1% 정도이었다. Thiourea와 thiosulfate용액에서 금은 전혀 용해되지 않았다. 산성의 thiourea용액에 제 2철이온을 첨가하면 은의 침출율이 상승했으며 제 2철이온과 황산의 복합효과를 규명하기 위해서는 추가 연구가 필요하다.
In order to exclude the effect of uneven distribution of gold in anode slime, the dissolution of gold and silver from the metal mixture was investigated in different systems, such as the mixture of hydrochloric acid and oxidizing reagents ($H_2O_2$, NaClO and $HNO_3$), thiosulf...
In order to exclude the effect of uneven distribution of gold in anode slime, the dissolution of gold and silver from the metal mixture was investigated in different systems, such as the mixture of hydrochloric acid and oxidizing reagents ($H_2O_2$, NaClO and $HNO_3$), thiosulfate and thiourea. In the mixture of HCl and either $HNO_3$ or $H_2O_2$, Au was completely dissolved but the leaching percentage of Ag was around 1%. In both thiosulfate and thiourea solution, gold was not dissolved at all. The presence of ferric ion in acidic thiourea solution showed a favorable effect on the leaching of silver but further study is necessary to elucidate the combined effect of ferric ion and sulfuric acid.
In order to exclude the effect of uneven distribution of gold in anode slime, the dissolution of gold and silver from the metal mixture was investigated in different systems, such as the mixture of hydrochloric acid and oxidizing reagents ($H_2O_2$, NaClO and $HNO_3$), thiosulfate and thiourea. In the mixture of HCl and either $HNO_3$ or $H_2O_2$, Au was completely dissolved but the leaching percentage of Ag was around 1%. In both thiosulfate and thiourea solution, gold was not dissolved at all. The presence of ferric ion in acidic thiourea solution showed a favorable effect on the leaching of silver but further study is necessary to elucidate the combined effect of ferric ion and sulfuric acid.
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제안 방법
Hence, there was some uncertainty in the absolute values of the leaching percentage of gold in the various conditions employed in those works. In order to exclude the effect of distribution of gold in the anode slime on the leaching, the mixture of pure gold and silver was employed in the leaching experiments of this work. For thiosulfate system, the effect of adding oxidizing agents and reaction temperature was investigated, while the effect of sulfuric acid concentration on the dissolution of silver and gold was also studied in the thiourea system.
대상 데이터
Pure silver (99.9%, 0.5-1 μm, spherical, Alfa Aesar) and gold (99.96%, 0.5-0.8 μm, spherical, Alfa Aesar) were employed for the leaching experiments.
참고문헌 (31)
Vinals, J., Nunez, C., and Carrasco, J., 1991 : Leaching of gold, silver and lead from plumbojarosite-containing hematite tailings in HCl- $CaCl_2$ media. Hydrometallurgy, 26, pp. 179-199.
Omer, Yavuz, Recep, Ziyadano Gullari, 2000 : Recovery of Gold and Silver from Copper Anode Slime. Separation Science and Technology, 35(1), pp. 133-141.
Vinals, J., Juan, E., Roca, A., Cruells, M., and Casado, J., 2005 : Leaching of metallic silver with aqueous ozone. Hydrometallurgy, 76(3-4), pp. 225-232.
Huang, K., Guo, J., and Xu, Z., 2009 : Recycling of waste printed circuit boards: a review of current technologies and treatment status in China. Journal of hazardous materials, 164(2-3), pp. 399-408.
Breuer, P. L. and Jeffre, M. I., 2003 : Copper catalysed oxidation of thiosulfate by oxygen in gold leach solutions. Minerals Engineering, 16, pp. 21-30.
Aylmore, M. G., Muir, D. M., and Staunton, W. P., 2014 : Effect of minerals on the stability of gold in copper ammoniacal thiosulfate solutions - The role of copper, silver and polythionates. Hydrometallurgy, 143, pp. 12-22.
Arima, Harunobu, Fujita, Toyohisa, Yen, Wan-Tai, 2004 : Using Nickel as a Catalyst in Ammonium Thiosulfate Leaching for Gold Extraction. Materials Transactions, 45(2), pp. 516-526.
Feng, D. and van Deventer, J. S. J., 2002 : The role of heavy metal ions in gold dissolution in the ammoniacal thiosulphate system. Hydrometallurgy, 64, pp. 231-246.
Chu, C. K., Breuer, P. L., and Jeffrey, M. I., 2003 : The impact of thiosulfate oxidation products on the oxidation of gold in ammonia thiosulfate solutions. Minerals Engineering, 16(3), pp. 265-271.
Xu, Bin, Yang, Yongbin, Jiang, Tao, Li, Qian, Zhang, Xi, and Wang, Dan, 2015 : Improved thiosulfate leaching of a refractory gold concentrate calcine with additives. Hydrometallurgy, 152, pp. 214-222.
Feng, D. and van Deventer, J. S. J., 2010 : Thiosulphate leaching of gold in the presence of ethylenediaminetetraacetic acid (EDTA). Minerals Engineering, 23(2), pp. 143-150.
Feng, D. and van Deventer, J. S. J., 2011 : Thiosulphate leaching of gold in the presence of carboxymethyl cellulose (CMC). Minerals Engineering, 24(2), pp. 115-121.
Bin, Xu, Yongbin, Yang, Qian, Li, Wei, Yin, Tao, Jiang, ad Guanghui, Li, 2016 : Thiosulfate leaching of Au, Ag and Pd from a high Sn, Pb and Sb bearing decopperized anode slime. Hydrometallurgy, 164, pp. 278-287.
Rivera, I., Patino, F., Roca, A., and Cruells, M., 2015 : Kinetics of metallic silver leaching in the $O_2$ -thiosulfate system. Hydrometallurgy, 156, pp. 63-70.
Vinals, J., Juan, E., Ruiz, M., Ferrando, E., Cruells, M., Roca, A., and Casado, J., 2006 : Leaching of gold and palladium with aqueous ozone in dilute chloride media. Hydrometallurgy, 81(2), pp. 142-151.
Li, J. and Miller, J. D., 2002 : Reaction kinetics for gold dissolution in acid thiourea solution using formamidine disulfide as oxidant. Hydrometallurgy, 63, pp. 215-223.
Li, Jinshan, Miller, Jan D., 2007 : Reaction kinetics of gold dissolution in acid thiourea solution using ferric sulfate as oxidant. Hydrometallurgy, 89(3-4), pp. 279-288.
Xing, Weidong, Ki Woog Lee, and Lee, Manseung, 2016 : Leaching of gold and silver from anode slime with inorganic reagents Journal of the Korea Institute of Resources Recycling, pp.submitted
Xing, Weidong, and Lee Manseung, 2016 : Leaching of gold and silver from anode slime with a mixture of hydrochloric acid and oxidizing agents Geosystem Engineering, pp.submitted
Yong., Wang, A., Baker Laura., D., Brindle Ian., 2016 : Determination of gold and silver in geological samples by focused infrared digestion: A re-investigation of aqua regia digestion. Talanta, 148, pp. 419-426.
White, H. A., 1905 : The solubility of gold in thiosulfates and thiocyanates. J.Chem. Metall. Miner. Soc. S. Afr., 5, pp. 109-111.
Aylmore, M. G., 2016 : Thiosulfate as an Alternative Lixiviant to Cyanide for Gold Ores. Gold Ore Processing, pp. 485-523.
Zhang, Suchun, Nicol, M. J., 2003 : An electrochemical study of the dissolution of gold in thiosulfate solutions Part I: Alkaline solutions. Journal of Applied Electrochemistry, 33, pp. 767-775.
Zheng, Su, Wang, Yun-yan, and Chai, Li-yuan, 2006 : Research status and prospect of gold leaching in alkaline thiourea solution. Minerals Engineering, 19(13), pp. 1301-1306.
Gaspar, V., Mejerovich, A. S., Aeretukov, M. and Schmiedl, J., 1994 : Practical application of potential-pH diagrams for Au-CS $(NH_2)_2$ - $H_2O$ and Ag-CS $(NH_2)_2$ - $H_2O$ systems for leaching gold and silver with acidic thiourea solution. Hydrometallurgy, 34, pp. 369-381.
Birloaga, I., De Michelis, I., Ferella, F., Buzatu, M., and Veglio, F., 2013 : Study on the influence of various factors in the hydrometallurgical processing of waste printed circuit boards for copper and gold recovery. Waste Manag, 33(4), pp. 935-41.
Gurung, Manju, Adhikari, Birendra Babu, Kawakita, Hidetaka, Ohto, Keisuke, Inoue, Katsutoshi, and Alam, Shafiq, 2013 : Recovery of gold and silver from spent mobile phones by means of acidothiourea leaching followed by adsorption using biosorbent prepared from persimmon tannin. Hydrometallurgy, 133, pp. 84-93.
Jing-ying, L., Xiu-li, X., and Wen-quan, L., 2012 : Thiourea leaching gold and silver from the printed circuit boards of waste mobile phones. Waste Management, 32(6), pp. 1209-1212.
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