光学介质膜的直接光谱法分析--TiO2-Ta2O5混合膜中Ta,Ti元素含量比的测定

本文介绍了采用原子发射光谱分析技术直接分析光学介质膜的新途径,建立了一套取样,激发和标样制备方法,测定了TiO₂-Ta₂O₅混合膜中Ta,Ti元素的含量比。     

连续重整装置关键设备的设计与制造

介绍了拥有连续重整专利技术的ＵＯＰ和ＩＦＰ两家公司的重整反应器的结构特征、制造加工难点和预加氢反应器选材、列管式立式换热器大型化现状以及这些设备的国产化情况。设计单位与设备制造单位和用户密切合作,顺利地完成了重整扇形筒和列管式立式换热器的设计与加工;开发了专用加工设备和特殊的加工工艺,解决了反应器开口接管的整体翻边对接补强难题;在安装过程中确保了反应器壳体椭圆度与中心管的垂直度。在连续重整装置关键设备的国产化道路上前进了一大步,并取得了一定的经济效益。     

微型制冷系统研究进展

得益于制造技术的进步和传热传质理论的发展完善,制冷系统不断向小型化、便携化发展,近年来出现了不少形式的微型制冷系统。本文介绍了3种主要的微型制冷系统:蒸气压缩制冷、吸收式制冷和半导体制冷系统。结合近年来国内外文献,介绍了制冷系统微型化的最新发展状况,并对各种系统的优缺点进行对比,重点介绍了微型蒸气压缩制冷系统及其核心部件—微型压缩机的发展现状。最后论述了制约制冷系统微型化的瓶颈问题,提出了微型制冷系统的发展方向。     

全球锂矿及伴生铍铌钽的采选冶技术发展趋势

这是一篇矿物分析领域的论文。采用盐酸、硝酸、氢氟酸、硫酸于聚四氟乙烯密闭消解罐中加热消解,酒石酸—稀盐酸介质提取,以电感耦合等离子体光谱法同时测定溶液中锂、铍、铌和钽。Li和Be在0~50 μg/mL、Nb₂O₅和Ta₂O₅在0~100 μg/mL范围内呈良好测现性关系,校准曲线相关系数r均大于0.9999,方法检出限分别为0.1 μg /g、0.5 μg /g、1.0 μg /g、0.1 μg /g。用于实际样品分析,加标回收率为94.6%~105.6%,锂、铍、铌、钽的相对标准偏差（n=11）分别为1.08%~7.04%、0.65%~13.06%、2.59~7.32%、2.02%~7.60%,用标准样品分析,测定值与认定值相符。     

Wheat straw-derived magnetic carbon foams: In-situ preparation and tunable high-performance microwave absorption

Recently, biomass-derived three-dimensional (3D) porous carbon materials have been gaining more interest as promising microwave absorbers due to their low cost, vast availability, and sustainability. Here, a novel 3D interconnected porous magnetic carbon foams are in-situ synthesized via a combination of sol-gel and carbonization process with wheat straw as the carbon source and FeCl₃·6H₂O as the magnetic regulating agent. During the process of foams formation, the lignocelluloses from the steam-exploded wheat straw are converted into interconnected carbon sheet networks with hierarchical porous structures, and the precursor FeCl₃·6H₂O is converted into magnetic nanoparticles uniformly embedded in the porous carbon foams. The generated magnetic nanoparticles are benefit to enhance the interface polarization and magnetic loss ability to improve the efficient complementarities between the dielectric and magnetic loss, thus increasing the impedance matching. The obtained sample treated at 600 °C displays the best microwave absorption (MA) performance. It presents a minimal reflection loss (RL) of −43.6 dB at 7.1 GHz and the effective bandwidth (RL < −10 dB) is 3.3 GHz with the thickness of 4.7 mm. The 3D porous structure, multi-interfaces and the synergy of dielectric loss and magnetic loss make great contribution to the outstanding MA performance.

     

粉煤灰/水合金属氧化物去除工业废水中Cu2+的研究

常温下,以酸改性粉煤灰、硝酸铁、硝酸铝为原料制备粉煤灰/水合金属氧化物复合吸附剂,通过SEM、XRD对其进行微观形貌观察及结构表征,用原子吸收分光光度法分析其对Cu2+的吸附性能.结果表明,制备复合吸附剂时,铝与铁摩尔比为2∶1、改性剂用量为0.4 g/g;吸附时吸附剂用量为20g/L、溶液pH值为8、吸附时间为90 min,Cu2+去除率可达97.8％,较酸改性粉煤灰提高了15.5％.