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试样经过高温分解,用硫酸调整酸度后,加钼酸铵形成硅钼杂多酸,先用草酸破坏磷,砷化合物,用亚铁还原为钼兰,根据色泽的深浅,测定二氧化硅的含量。 相似文献
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含钼催化剂的应用与前景 总被引:2,自引:0,他引:2
根据催化剂中含钼化合物成分的不同,分别综述了钴钼镍钼催化剂、钼的硫化物催化剂、多相氧化物催化剂、负载型钼基催化剂、钼杂多化合物催化剂、钼酸盐催化剂、新型碳化钼和氮化钼催化剂等在化学反应中的应用及机理,并对含钼催化剂的应用前景进行了展望. 相似文献
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面向21世纪的钼润滑技术 总被引:3,自引:1,他引:2
叙述了近年来国内外钼系润滑剂、添加剂,如二硫化钼、钼酸盐、硫代钼酸盐、有机钼化合物及其复配物、二硫化钼涂膜和纳米级二硫化钼的研究进展。 相似文献
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铀、钼分离工艺中铀和钼的测定(Ⅱ).钼的测定 总被引:1,自引:1,他引:0
介绍了铀、钼提取工艺各种样品中钼的测定方法及其应用,铀钼矿及其浸出渣样品,首先用混酸分解,然后在硝酸介质中,用二氯化锡将钼(Ⅵ)还原到钼(Ⅴ)与硫氰酸盐反应形成橙红色配合物,可用分光光度法测定;淋浸液,吸附-淋洗液和反萃取液中的钼可直接采用光度法测定,离子交换树脂中的钼,需在加热条件下,用氢氧化钠溶液浸取,然后以快速光度法测定;铀产品(化学浓缩物)和高含量铀样品中的微量钼,在硫酸介质中,钼(Ⅴ)与硫氰酸盐反应形成可溶性配合物,可用异戊醇萃取分离,光度法测定;对钼产品(多钼酸铵)中高含量的钼,则采用氢氧化钠溶液溶解样品,以EDTA容量法测定,在pH2~5的硫酸溶液中,用盐酸羟胺将钼(Ⅵ)还原到钼(Ⅴ)与EDTA反应形成(1:1)配合物,过量的EDTA用铋盐反滴定,简述了各种方法的基本原理,最佳测定条件,应用范围和操作步骤。经大量样品的例行分析证实,所得结果均准确可靠,而且操作简便快速,各方法的精密度和准确度较好,精密度优于5%,标准加入回收率为98.5%~104%。 相似文献
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阐述了利用废钴催化剂工业化生产环烷酸钴的化学反应原理、生产工艺流程、工艺条件及其操作方法、注意事项、技术经济效果等。 相似文献
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以钼酸钠为钼源,硫脲为硫源,分别加入两种不同的还原剂(盐酸羟胺、草酸),采用水热法制备了形貌规整的二硫化钼微球花。结果表明:当体系中初始钼硫比小于或等于1∶5时,产物为纯净的二硫化钼;随着钼硫比的减小,所得产品粒径也逐步增大。两种不同还原剂作用下,均可制备得到布满褶皱状薄片的二硫化钼球花。盐酸羟胺还原剂作用下所得产物比草酸还原剂作用下所得产物的粒径要稍大,但花瓣状更清晰,褶皱程度更高,团聚程度也较轻。并对其原因做了阐述。 相似文献
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A new compound of Cs (ATZ) was synthesized by reaction of CsOH aqueous solution with 5-aminotetrezole. This compound was identified by C, H and N elemental analysis and quantitative analysis of Cs atom. The molecular formula is Cs (ATZ). The physicochemical properties were characterized by FTIR, Raman spectroscopy and X-ray power diffraction and the peaks of FT-IR were also assigned. 相似文献
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Gubendiran Ramesh Kumar Srinivasan Gokul Raj Rajagopal Mohan Ramasamy Jayave 《中国稀土学报(英文版)》2006,24(Z1)
Crystals of DL-threonium trichloroacetate (DLTTCA) was synthesized from an aqueous solution by slow evaporation technique. The grown crystals were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, UV-Vis-NIR and SHG measurements. Vibrational structure of the crystal was elucidated from FTIR analysis and the hydrogen bond interactions were discussed in detail. The ultraviolet transparent cutoff falls at 212 nm. Thermal stability of the compound was also studied. The powder SHG efficiency of the compound was measured as 0.62 times to that of KDP. 相似文献
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阐述了一种新型三烷基胺(N235,R3N,R=C8-C10)萃淋树脂合成方法,研究了N235萃淋树脂对铼(VⅡ)与钼(VⅠ)的提取作用,并通过等摩尔量系列法和斜率法对N235萃淋树脂提取铼的机理进行了探讨。结果表明在不同的酸度下可以通过该萃淋树脂实现钼(VⅠ)和铼(VⅡ)分离。 相似文献
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Preparation of Compound Ultrafine CeO2 by Wet-Solid-Phase Mechanochemical Modification 总被引:1,自引:0,他引:1
To satisfy practical requirements from industrial applications, an alternate route for synthesis compound ultrafine CeO2 powders by wet-solid-phase mechanochemical modification using industrial grade hydrated cerium carbonate as raw material was proposed.The effect of modifier reaction percentage, reaction time, calcining temperature and modifier amount on particle size, density, suspensibility, and hardness of compound CeO2 powder was investigated.The phase evolutions of preparation process were characterized by XRD.SEM micrograph of the final product shows that compound CeO2 powders obtained are well-dispersed, spherically-shaped, uniformly-sized and submicron-sized particles.The method is readily available in raw material, low in cost, simple in process, and has great potential for industrialization.The compound CeO2 powders of different physical properties can be synthesized by controlling the above-mentioned influence factors in preparation process. 相似文献
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溶剂萃取法从加压浸出液中提取钼 总被引:1,自引:0,他引:1
硫化钼精矿的处理方法通常采用氧化焙烧法,但在中国,该方法存在的最大问题是低浓度SO2污染。近年来,一些可行的工艺被研究,如加压浸出(POX)-萃取(SX)工艺。北京矿冶研究总院(BGRIMM)采用该工艺进行了一系列的试验研究,研究结果表明,采用该工艺钼总回收率大于97%。加压浸出过程中有15%~20%的钼进入溶液,该部分钼可采用溶剂萃取的方法进行提取,在有机相组成N235+煤油,O/A=3/1,混合时间3min的条件下,钼的萃取率可达到98%以上,负载有机相采用25%的氨水反萃,O/A=1/3,在两级逆流萃取的条件下钼反萃率超过98%。今后在中国,POX-SX工艺在钼提取方面是一个非常具有竞争优势的工艺。 相似文献
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B Tozkoparan M Ertan B Krebs M L?ge P Kelicen R Demirdamar 《Canadian Metallurgical Quarterly》1998,331(6):201-206
In this study, thirty six new 2-benzylidene-7-methyl-3-oxo-5- phenyl-2,3-dihydro-5H-thiazolo[3,2-alpha]pyrimidine-6-carboxylic acid methyl esters were synthesized and characterized by spectral, crystallographic, and elemental analysis. The antiinflammatory activity of the compounds was tested by the carrageenan hind paw edema test. It was found that compound 6a having a 2-meth-oxyphenyl group at position 5 and a benzylidene group at position 2 was the most potent compound in this series. All the compounds that were tested for ulcer activity gave positive results. 相似文献