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than controlled by cyanide ion diffusion. MRKUSIC et al [4] reported that the anodic curve of pure gold obtained in the presence of magnetite showed that the rate of gold dissolution could... of cyanide concentration on gold anodic dissolution rate is complex. When the cyanide concentration was below 980 mg/L, the dissolution of gold in the de-aerated cyanide solutions was controlled......
sources of undesirable forms of cyanide ion wastewater. Cyanide compounds present in environmental matrices and waste streams as simple and complex cyanides, cyanates and nitriles [4]. Therefore... exhibited highly improved sensing performances. The ZnO@NiO nano crystals were found to have better capacity for iron cyanide than sodium cyanide. The effects of significant parameters such as contact......
of metal cyanide complexes is believed to occur via an ion-exchange mechanism: (Q+X-)org+(HP)org+OH-=(Q+P-)org+X-+H2O (1) where Q+ is the quaternary ammonium cation, HP... solution which accounts for more than 98% of total copper and cyanide (it may vary in a slight extent depending on the formation constants chosen for the copper cyanide complex species) [15......
Co-intensification of cyanide leaching gold by mercury ions and oxidant LI Qian(李 骞), JIANG Tao(姜 涛), YANG Yong-bin(杨永斌), LI Guang-hui(李光辉), GUO Yu-feng(郭宇峰), QIU Guan-zhou(邱冠周) School... that under low cyanide concentration, gold cyanide process is controlled by CN- transfer, while at higher cyanide concentration, there forms passivation on gold surface. Therefore, chemical oxidation......
, such as sulfur dioxide [15], ozone [16,17], hydrogen peroxide [18], and iron/copper precipitation processes [19] are also commonly used for cyanide destruction in practice. However, these methods have..., the complex nature of cyanide wastewater, primarily the high concentrations of cyanide, may seriously restrict their industrial application. Efficient thermal decomposition or destruction of cyanides......
constituted to the Fe(III) and Fe(II) medium, respectively. The A. ferrooxidans medium was a culture which suspended bacteria in 9K basic medium. The complex solutions of A. ferrooxidans and iron ion... of iron settling correlates with ferrous ion content in bio-leaching solution. In medium containing A. ferrooxidans and Fe(III), the increment in Fe(II) concentration leads to the formation of jarosite......
Introduction Cyanide with its competency to form a strong complex with gold, is the most preferable reagent for leaching of gold from ores. Cyanide leaching is not inherently a selective process... from these earlier studies that the chemistry of ammoniacal cyanide leaching is rather complex with intimate interactions among the species of ammonia, copper and cyanide. The presence of copper......
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Treatment of nickel-ammonia complex ion-containing ammonia nitrogen wastewater MIN Xiao-bo(闵小波), ZHOU Min(周 敏), CHAI Li-yuan(柴立元), WANG Yun-yan(王云燕), SHU Yu-de(舒余德) School...; Abstract: Air stripping was adopted to treat nickel ammonia complex ion-containing......
Catalytic performance of cerium iron complex oxides for partial oxidation of methane to synthesis gas LIU Mingchun1,LI Kongzhai1,WEI Yonggang1,WANG Hua1 (1.Faculty of Materials and Metallurgy Engineering,Kunming University of Science and Technology,Kunming 650093,China) Abstract:The cerium iron complex oxides oxygen carder was prepared by the co-precipitation method. The reactions between......
