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Kinetics and mechanism of Re(Ⅶ) extraction and separation from Mo(Ⅵ) with trialkyl amine

Transactions of Nonferrous Metals Society of China 2010年第S1期20卷 10-14页

作者：娄振宁熊英宋俊俊单炜军韩光喜邢志强孔玉霞 College of Chemistry Liaoning University

The extraction kinetics of rhenium(Ⅶ) or molybdenum(Ⅵ) with trialkyl amine (N235, R3N, R=C8–C10) dissolved in heptane were investigated by constant interfacial cell with laminar flow, which aimed to identify the extraction regime, reaction zone and rate equations. The influence of stirring speed, temperature, specific interfacial area, extraction concentration and chlorine concentration on the extraction of both metals was studied. It is concluded that the extractions of Re(Ⅶ) and Mo(Ⅵ) both take place at the liquid-liquid interface, while the extraction regimes are chemically-controlled for rhenium and mixed controlled for molybdenum, respectively. The extraction rate equations and the rate-determining step were obtained under the experimental conditions, and the extraction rate constant of Re(Ⅶ) or Mo(Ⅵ) with N235 was calculated. These obtained kinetics parameters are different between Re(Ⅶ) and Mo(Ⅵ), which provides better possibilities for Re(Ⅶ) and Mo(Ⅵ) separations at proper conditions.

关键词： extraction kinetics separation N235 rhenium molybdenum

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电感耦合等离子体原子发射光谱标准加入法测定钼精矿及烟道灰中的铼

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分析化学 2011年第8期39卷 1291-1292页

作者：张磊李波孙宝莲周恺西北有色金属研究院

1引言铼是一种稀有稀散金属元素,在地壳中含量极低。自然界中的铼主要以类质同相伴生在辉钼矿、铜钼矿中,焙烧钼精矿过程中产生的烟道灰也是回收铼的主要原料。金属铼具有硬度大、耐腐蚀、耐磨、熔点高、强度高以及良好的塑性等特点,广... 详细信息

1引言铼是一种稀有稀散金属元素,在地壳中含量极低。自然界中的铼主要以类质同相伴生在辉钼矿、铜钼矿中,焙烧钼精矿过程中产生的烟道灰也是回收铼的主要原料。金属铼具有硬度大、耐腐蚀、耐磨、熔点高、强度高以及良好的塑性等特点,广泛应用于石油化工、国防、航空航天、核能及电子工业等领域。铼的稀有分散性和金属铼及其合金的特殊性能,使

关键词： Inductively coupled plasma atomic emission spectrometry-standard addition method Molybdenum ores Flue dust rhenium

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The Investigation of Microstructure and the X-Ray Phase Analysis of Re-X Alloys (X = S, Se, Te)

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Journal of Materials Science and Chemical Engineering 2015年第10期3卷 1-8页

作者： E. A. Salakhova D. B. Tagiyev K. F. Ibrahimova P. E. Kalantarova Laboratory of Electrochemistry of rhenium Alloys and Electrocatalysis Institute of Catalysis and Inorganic Chemistry NAS of Azerbaijan Baku Azerbaijan

Influence of terms electrolysis and concentration of electrolysis components on the microstructure obtaining films of the chalcogenides rhenium has been studied. Appearance and structure electrolytical depositions of chalcogenides rhenium, obtaining by electrochemical method, depend from electrolysis conditions. In the process of studying of electrolysis conditions has determinated that for obtaining qualitative depositions of rhenium chalcogenides most suitable temperature is 75℃- 80℃. Microscopic studying of surface of catholic deposition of Re-Se showed that on the cathode had been obtained dense fine-crystalline black coverings. More qualitative depositions have been obtained for low current density. Increasing if current density adducts to gradual deterioration of structure cathode depositions. It has been determinated that specific influence on the process of deposition Re-S alloys has changing of electrolyte pH and current density. At low pH values, the colloidal sulfur formed in electrolyte has adsorbed on the cathode and bearing to the deposits quality. Microscopic studying of surface of cathode depositions Re-Te2 showed that on the cathode at current density 2 mA/sm2 had been obtained dense grey fine crystalline deposits of ReTe2.

关键词： Electrochemistry rhenium Chalcogenides Microstructure Electrodeposition Alloys Films

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Heat Treatment Effect on Microstructure and Mechanical Properties of Re-Containing Inconel 718 Alloy

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Journal of Minerals and Materials Characterization and Engineering 2012年第9期11卷 924-930页

作者： Nader El-Bagoury Mohamed Ramadan Central Metallurgical Research and Development Institute (CMRDI) P.O. Box 87 Helwan Cairo Egypt

The effect of rhenium additions to the standard Inconel 718 (ST IN718) alloy as well as solution and aging treatments on microstructure and hardness property were studied. The microstructure of Re-containing alloys has higher volume fraction of δ phase than standard alloy. Conventional solution treatment (CST) at 1273 K for 1h precipitates a thin film of δ phase at the grain boundaries as well as needle-like in γ matrix;however, after modified solution at 1440 K for 3 h long, both types of δ phase precipitates entirely vanish from the microstructure. Small colonies of needle-like δ phase start to appear with aging at 1023 K for 4 h, after CST. Prolonging the aging time to 50 h, these colonies enlarge in size and spread in the matrix. XRD and TEM observations were used to identify the precipitation of hard γ” and γ’ phases. The changing in hardness measurements were evidence about the precipitation of these hard phases. CST have higher rate to increase in hardness with aging time comparing to modified solution specimens.

关键词： Standard Inconel 718 rhenium Solution and Aging treatments Laves and Delta phases Hardness Property

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Obtaining the thin Semiconductive Covering Re-Se From Sulphate Electrolyte

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Advances in Materials Physics and Chemistry 2012年第4期2卷 253-255页

作者： E.A. Salakhova A.M. Aliyev Institute of Chemical Problems of the ANAS 29 H. Javid ave. AZ1143 BakuAzerbaijan

There have been investigated the kinetics and mechanism of the cathode electrodeposition of thin coverings Re-Se?from the sulphate electrolyte, containing NH4ReO4, SeO2 and H2SO4. On the base of X-ray phase analysis and by the method of cyclic avometry there have been determined the content of obtained coverings, electrosettled at the various concentrations of components in electrolyte. The co-deposition process was shown to be attended by depolarization, which is due to the energy release upon the formation of the alloy.

关键词： Electrodeposition Alloys rhenium Selen Semiconductive Cover

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Effects of Slight Re Addition on a Fe-25Mn-6Si-5Cr Shape Memory Alloy

Effects of Slight Re Addition on a Fe-25Mn-6Si-5Cr Shape Mem...

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第五届国际材料与热加工物理模拟及数值模拟学术会议

作者： T.P. Wang1, H.C. Lin2, K.M. Lin1, W.J. Wu2, P.C. Lo2, F.H. Chen3 1Department of Materials Science and Engineering, Feng Chia University, Taichung, Taiwan 2Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan 3King Yee Chen Enterprise Co. LTD., Yunlin, Taiwan

Slight amounts of rhenium (Re) were added into the Fe-25Mn-6Si-5Cr shape memory alloy. The crystal structure, shape memory effect and thermo-mechanical training of these alloys were investigated. Experimental results show that both ε martensite and γ austenite coexist at room temperature for the Fe-25Mn-6Si-5Cr--Re alloys. The Fe-25Mn-6Si-5Cr-0.13Re alloy exhibit an excellent shape recovery of 957%. The 50000℃annealing can improve significantly the shape memory performance of Fe-25Mn-6Si-5Cr--Re alloys. But the as-rolled and 80000℃ annealed specimens have a worse shape recovery. Thermo-mechanical training can also effectively raise the alloy’s shape memory performance. The Fe-25Mn-6Si-5Cr-0.13Re alloy exhibit a more striking efficacy of thermo-mechanical training than the Fe-25Mn-6Si-5Cr alloy.

关键词： Fe-Mn-Si-Cr shape memory alloys rhenium shape memory effect thermo-mechanical training

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ReBr(CO)_5-Catalyzed Knoevenagel Condensation

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合成化学 2004年第Z1期12卷 42-42页

作者： ZUO Wei-xiong HUA Rui-mao SUN Hong-bin Department of Chemistry Tsinghua University Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Educaton Beijing 100084China Department of Chemistry Tsinghua University Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Educaton Beijing 100084China Department of Chemistry Tsinghua University Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Educaton Beijing 100084China

Knoevenagel condensations are especially important reactions for the synthesis of alkene compounds having electron-withdrawing groups such as COR,CN,COOR,NO2 etc. Recently,transition metal hydride ruthenium1, hydride and polyhydride rhenium2, and polyhydride iridium complexes have been found to be the efficient catalysts for Knoevenagle condensation. However the mentioned-above transition metal hydride complexes are not easily prepared. In addition, all of them are oxygen and H2O-sensitive, unstable compands. Therefor the catalytic reactions are required to be carried out under an inert atmosphere, and using the prepurified reagent.In the paper, We wish to report the development of Knoevenagel condensation catalyzed by ReBr(CO)5 under an air atmosphere in the absence of solvent.All the experiments were carried out under 1atm, without solvent.The resuIts of the representative Knoevenagel condensations are summarized in Table 1.The Knoevenagel reaction with diethyl malonate can be catalyzed by ReBr(CO)5, while the present Knoevenagel reactions catalyzed by transition metal have at least one cyano group in active methylene compouds.A propose mechanism for present catalytic coupling dehydration reactions is also illustrated in the paper.Briefly, this paper reports the ReBr(CO)5-catalyzed Knoevenagel reaction. The reaction is a new method for the Konevenagel condensation.

关键词： Knoevenagel, Bromopentacarbonyl rhenium

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电感耦合等离子体质谱法测定辉钼矿中Re、Os含量质量分馏效应的校正

电感耦合等离子体质谱法测定辉钼矿中Re、Os含量质量分馏效应的校...

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中国质谱学会第七届会员代表大会暨学术报告会

作者：屈文俊杜安道中国地质科学院国家地质实验测试中心

Re-Os同位素体系作为一种对金属矿床可以直接精确定年,而且成为成矿物质来源示踪研究强有力的手段,已发展为同位素地球化学研究领域的一个新的热点。同样Re-Os同位素体系在我国地学领域的研究与应用也已有10年的发展历史。其中,辉钼矿... 详细信息

Re-Os同位素体系作为一种对金属矿床可以直接精确定年,而且成为成矿物质来源示踪研究强有力的手段,已发展为同位素地球化学研究领域的一个新的热点。同样Re-Os同位素体系在我国地学领域的研究与应用也已有10年的发展历史。其中,辉钼矿是最常用的用于Re-Os同位素体系地质年龄测定研究的对象,这是因为辉钼矿矿物中富含Re,并且几乎不含普通Os。因此,辉钼矿中的Os几乎全由Re衰变而生成,这样,衰变子体Os异常值就比较明显。

关键词： inductively coupled plasma mass spectrometry （ICP-MS） mass bias rhenium osmium molybdenite

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