川北某黑色页岩型铼矿工艺矿物学研究

通过矿相显微镜、扫描电镜、电子探针、X射线能谱元素面分析等多种手段综合研究了川北某黑色页岩型铼矿中铼的赋存状态。样品为黑色页岩,有机碳含量较高。粘土矿物总量为14.6%,黄铁矿含量16.2%,石英含量37.7%。样品具典型的粘土结构,矿物粒度微细。铼有两种赋存状态,一种呈类质同象形式赋存于黄铁矿内,另一种则以分散形式存在。典型黄铁矿测点Re平均含量为0.024%。黄铁矿是Re的重要载体矿物。建议通过浮选分离黄铁矿,从而实现Re的富集。      

CVD法制备的Ir/Re涂层复合材料界面扩散研究

采用化学气相沉积(CVD)技术制备了Ir/Re 涂层复合材料,并在高温高真空条件下对复合材料样品进行扩散热处理。应用电子扫描波谱法探针研究了Ir/Re复合材料界面Re元素在Ir涂层中的扩散规律。应用半无限大扩散模型进行处理,得到了1400-2000℃温度范围的实验扩散系数,扩散系数与温度之间符合Arrhenius方程。根据实验结果推算,Ir/Re复合材料在2200℃时的工作寿命为47.6小时。     

The Effect of Sintering on the Properties of Ultrafine

研究了一种化学气相沉积(CVD)制备超细铼粉的新方法,即以NH4ReO7为原料,通过将其分解为Re2O7后气相输运至还原区,经氢气还原生成超细铼粉。对不同还原温度下制备的超细铼粉样品,采用XRD、SEM、激光粒度分析进行表征,实验揭示了烧结作用对晶粒尺寸、形貌、表面状态及粒度等粉末性能的影响规律。结果表明,随还原温度升高,烧结作用增强,制备的超细铼粉晶粒尺寸增大,具有更好的球形度,表面趋于光洁,平均粒径增大。     

铬黑T-溴酸钠催化动力学分光光度法测定铼

基于在硫酸介质中,铼催化溴酸钠氧化铬黑T的褪色反应,建立了测定铼的光度分析新方法。确定了催化体系的动力学条件,计算得出催化反应的表观活化能Ea=39.12KJ/mol,反应速率常数为K=1.248×10-3/s。在选定的试验优条件下,铼的浓度在0~10.02mg/L范围内与相对吸光度呈良好的线性关系,检出限为2.7675mg/L。方法所用仪器简单,操作简便。     

Adsorption and separation of rhenium(VII) using N‐methylimidazolium functionalized strong basic anion exchange resin

BACKGROUND: Rhenium is a rare and valuable metal coexisting with molybdenum in molybdenite and sulfide copper ores and is hard to separate. Methods such as solvent extraction, ion exchange, adsorption, precipitation, etc. have been used to separate and purify Re(VII), and resin ion exchange has been widely investigated and used owing to its convenient operation and relatively low‐cost. The main challenge comes from the preparation of resins having high performance and stability. In an earlier study, an N‐methylimidazolium functionalized strong basic anion exchange resin was successfully synthesized and used for Cr(IV) extraction. This paper, reports on further synthesis and application of this resin for adsorption and separation of Re(VII) and Mo(VI), especially from copper arsenic filter cake. RESULTS: At pH 6.25, Re(VII) and Mo(VI) can be effectively separated with the N‐methylimidazolium functionalized strong basic anion exchange resin, giving a Re(VII) recovery of up to 93.3%, but only 5.1% for Mo(VI). When using the copper arsenic filter cake sample 89.1% Re(VII) recovery was achieved. CONCLUSION: The N‐methylimidazolium functionalized strong basic anion exchange resin exhibited high selectivity and recovery for Re(VII) in a mixed system. © 2012 Society of Chemical Industry     

Co-Cu-Re 高温自润滑合金的研究

冶炼了五种 Co-Cu-Re 合金样品。当 Cu 和 Re 含量较低时,只有两种结构的 Co 固溶体相,Cu 和 Re 量达12.5at.-%,出现 Cu 及 Re 的固溶相。用往复式高温销盘摩擦试验机测定摩擦系数随温度变化,并与 Co,Co-Re,Cu-Re 对比,用 X 射线及能谱测定磨屑、表层氧化物及 Co-Cu-Re 550℃挥发物结构,测定磨屑及近表层成分。试验结果表明,Co-Cu-Re 合金高温摩擦系数低至0.15—0.20的原因是,Re 抑制了 Co 的相变及形成易挥发的含 Re 氧化物膜起润滑作用。设计了自生氧化膜减摩作用模型。     

Thermophysical measurements on solid and liquid rhenium

A fast resistive heating technique was used to measure such thermophysical data of solid and liquid rhenium as enthalpy, specific heat, thermal volume expansion, and electrical resistivity. The measurements are performed with heating rates of slightly more than 10⁹ K · s ^–1 up to states of superheated liquid rhenium (7500 K).Paper presented at the Ninth Symposium on Thermophysical Properties, June 24–27, 1985, Boulder, Colorado, U.S.A.     

加压浸出法从失效重整催化剂中分离铂铼

失效铂铼催化剂中铂铼性质相似,难以分离,采用碳酸钠加压浸出选择性分离铼,研究了浸出条件对铼浸出效率的影响。在反应温度为160℃,反应时间为150 min,浸出剂碳酸钠用量为物料量的8%,搅拌速率为500 r/min,液固比为4:1,反应压力为0.5 MPa的条件下,铼浸出率98.5%,铂基本不溶解而留在渣中,实现铂和铼的初步分离。     

含铼钼精矿焙烧尾气收尘与铼回收一体化装置的研制与应用

研制了一种含铼钼精矿焙烧尾气收尘和铼回收装置,该装置将自激式除尘器技术与球面筛板塔技术相结合:采用自激式除尘器进行收尘和铼回收;采用球面筛板淋洗塔进行进一步收尘和铼回收,并将其应用到工程实际中。这是国内首次成功地将此类装置应用于钼精矿焙烧尾气收尘和铼回收生产实践中。经过生产实践,证明该装置切实可行,淋洗效率高,并具有结构简单、操作方便、成本低和能耗小等特点。此外,此除尘系统还可应用于冶金矿山、化工和建材等领域中的湿法除尘。