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sulfuric acid medium were studied through the methods of slope, constant molecule and saturation extraction. The extraction equilibrium constants, enthalpy change and entropy change of the reaction were... is an exothermic process. Consequently, the extraction and separation effect for rare earth can be improved with synergistic mixture of D2EHPA and HEHEHP. Key words: D2EHPA; HEHEHP; sulfuric acid......
Trans. Nonferrous Met. Soc. China 25(2015) 3139-3145 Kinetics of titanium leaching with citric acid in sulfuric acid from red mud Xiao-bo ZHU1,2, Wang LI1,2, Xue-mao GUAN1,2 1. School of Materials... Received 13 October 2014; accepted 28 December 2014 Abstract: The recovery of titanium with citric acid in sulfuric acid from red mud was put forward to strengthen acid leaching efficiency. The main......
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分步插层法制备硝酸盐-硫酸-GIC 张显友1,杜鹏1,韩志东1,董丽敏1 (1.哈尔滨理工大学,材料科学与工程学院,黑龙江,哈尔滨,150040) 摘要:通过硫酸,硝酸或硝酸盐分步插层的方法,成功制备了硝酸/硝酸盐-硫酸-GIC三元石墨层间化合物.采用XRD,SEM和EDS对GIC的结构进行了研究.结果表明:与直接插层法相比,分步插层法有利于插层物质的插层反应,充分扩大石墨层间距,形成低阶石墨层间化合物,使膨胀效果更优,膨胀体积高达450mL/g以上;膨胀后GIC的孔结构均匀,层壁较薄,片层结构清晰,膨胀充分.同时,分步插层法能够降低实验操作的危险性,污染小,反应易于控制. 关键词:分步插层法; 石墨层间化合物; 硝酸; 硫酸; Two-step intercalation method; GIC; Nitric acid; Sulfuric acid; [全文内容正在添加中] ......
that when the agitation rate is above 600 r-min-1, its influence on indium leaching rate is insignificant. It is determined that the leaching rates increase with the increase in sulfuric acid concentration..., with apparent activation energy of 65.7 k J-mol-1. The apparent reaction orders of sulfuric acid and oxygen partial pressure are determined to be 0.749 and 1.260, respectively. The leaching reaction process......
that the sulfuric acid resistance of mortar was enhanced by silane. Based on these results, it is revealed that silane addition inhibits the diffusion of water, and consequently, sulfate ion diffusion rate decreases, thereby resulting in reduction in the rate of corrosion of cementitious composites by sulfuric acid.关键词:......
Abstract: The leaching processes of zinc plant purification residue in sulfuric acid solution were investigated with respect to the effects of sulfuric acid concentration, reaction temperature, and particle size. A particle size of 75-80 μm was required to leach 99.8% cobalt and 91.97% zinc at 70 °C for 20 min when the sulfuric acid concentration was 100 g/L and the ratio of liquid to solid was 50......
. (in Chinese) [5] SUI Li-li, ZHAI Yu-chun, MIAO Li-hua. Recovery of titania from high titanium slag by roasting method using concentrated sulfuric acid [J]. Rare Metals, 2015, 34(12): 895–900. [6] WAN He... J. Cent. South Univ. (2019) 26: 806-812 DOI: https://doi.org/10.1007/s11771-019-4050-6 Flotation behavior and adsorption mechanism of salicylhydroxamic acid in artificial mineral anosovite WANG Xue......
Engineering Journal, 2009, 153(1): 1–8. DOI: 10.1016/j.cej.2009.04.042. [27] ZHU Xiao-bo, LI Wang, GUAN Xue-mao. Kinetics of titanium leaching with citric acid in sulfuric acid from red mud [J]. Transactions... ARTICLE J. Cent. South Univ. (2019) 26: 430-439 DOI: https://doi.org/10.1007/s11771-019-4015-9 Improvement of alkaline electrochemical characteristics of bauxite residue amendment with organic acid......
Formation Process of Porous Anodic Film in Sulfuric/Oxalic Acid Mixture Electrolyte杨培霞,安茂忠,郭洪飞摘 要:Porous anodic alumina film (PAA film) was fabricated on pure aluminum in sulfuric/oxalic acid mixture electrolyte and was compared with the film prepared in single sulfuric acid electrolyte. Scanning electron microscopy (SEM) was employed to investigate......
