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The technique of hydrothermal stripping from mixed aqueous-organic systems is a promising method for synthexizing oxide ceramic powdcrs for high-performance applications.Some factors influcncing heterogeneous hydrothermal stripping with water from iron-loaded organic phase of naphthenic acid-isooctyl alcohol-kerosenc,such as initial concentrations of iron and naphthenic acid,concentration of Fe2O3“seed”,temperature and time,were investigated.Baseed on the experimental results,the rate equation was established.Nano-ferric oxide powders were obtained by the technique of hydrothermal stripping from the iron-loaded organic phase.The results suggest that the heterogeneous hydrothermal stripping proceeds in 3 steps:adsorption of naphthenic acid dimers and naphthenic complex of iron onto the surface of “seed”,hydrolysis of adsorbed complex of iron,and condensation of hydrolyzed complex.The process activation energy is 115kJ/mol and the heterogeneous hydrothermal stripping is controlled by a chemical reaction(the hydrolysis of naphthenic complex of iron). 相似文献
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引 言钇稳定二氧化锆 (YSZ)是制备氧化物燃料电池和氧传感器的重要材料 .电解质薄膜化是开发高输出电流密度的固体氧化物燃料电池和高灵敏度的传感器的研究方向 .电化学气相沉积 (EVD) [1~ 3] 制得的薄膜致密 ,且厚度仅 2 0~ 4 0 μm ,薄膜性能优良 ,但设备复杂 ,制备成本高 ,反应生成的氯气腐蚀性大 .激光沉积法具有设备复杂、成本高等问题 .等离子喷涂 (VPS、APS) [4 ,5] 适于大规模制膜 ,但薄膜不够致密 ,裂缝较多 .溶胶 -凝胶法 (Sol -Gel) [4 ,6 ,7] 制得的YSZ薄膜致密且薄 ,设备简单 ,但对于基片要求很严 ,… 相似文献
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埋入堆叠芯片技术在实现封装小型化的同时,增加了封装电学设计的复杂性。以一个数字系统为例,详细阐述了埋入堆叠芯片封装结构的电学设计过程。利用电磁仿真软件提取了该封装结构的寄生参数,并通过S参数、延时、反射分析,确定长绑定线为影响链路信号质量的关键因素,其影响直接限制了埋入堆叠芯片技术的应用范围。运用RLC传输线模型分析了长绑定线造成大的信号质量衰减的原因。最后,提出了一种大幅减短绑定线长度并提升链路电学性能的优化结构,拓展了此技术在高速领域的应用。眼图的对比结构表明,新结构能降低链路的阻抗失配,减小信号延时,并大大改善高速信号的质量。 相似文献
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研究锌精矿在H2SO4-HNO3体系中浸出与四氯乙烯萃取硫磺的耦合过程。考察了浸出时间、四氯乙烯的加入对锌浸出的影响。结果表明,在85℃,氧气压力0.1MPa,H2SO4浓度1.8mol/L,HNO3浓度0.2mol/L条件下,加入20mL四氯乙烯萃取硫磺时,锌浸出率在3h内达到99.7%,与常规浸出相比,浸出时间缩短了50%,耦合效果明显。 相似文献
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FeCl3-HCl-C2Cl4体系浸出硫化锌矿的动力学研究 总被引:2,自引:0,他引:2
针对FeCl3-HCl-C2Cl4体系浸出硫化锌精矿过程,建立了以固体产物层扩散控制和混合扩散控制浸出的核收缩动力学模型。动力学研究和浸出过程矿粒表面的SEM分析结果表明,在相同的搅拌强度下,FeCl3-HCl体系符合固体产物层扩散控制的核收缩过程,四氯乙烯能有效地溶解矿粒表面形成的固体硫层,提高固体产物层扩散控制的速度,并且随四氯乙烯加入量的增大;对于FeCl3-HCl-C2Cl4体系则由固体产物层扩散控制变为混合扩散控制的的核收缩过程,显著地提高了浸出速率。 相似文献
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The effects of surfactant on the solvent extraction in leaching sphalerite were investigated. It is found that sodium dodecyl sulfonate is the effective surfactant in improving the zinc recovery from sphalerite in the aqueous FeCla-HCl-tetrachloroethylene system. Through the measurements of surface tension and viscosity of the sphalerite slurry modified with different surfactants, it is concluded that sodium dodecyl sulfonate in the concentration range of 0.05 to 0.2g@L-1 can improve the viscosity of sphalerite slurry in the water, decrease the surface tension of leaching solution, prevent the aggregation of ore particles, and give very high zinc extraction . 相似文献
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