内蒙古呼伦贝尔市陈旗朝泥钼矿床地质特征初探

内蒙古呼伦贝尔市陈旗朝泥钼矿区,研究程度较低,许多基础地质问题有待解决,找矿方向有待确立,通过本次的地质调查,对该区区域成矿背景、矿区地质特征、矿床地质特征及成矿条件等进行初步分析,认为该矿区钼矿床是受额尔古纳-呼伦深断裂、得尔布干深大断裂控制,发育的次级断裂作用形成的斑岩型钼矿床。     

Properties of a reaction-bonded β-SiAlON ceramic doped with an FeMo alloy for application to molten aluminum environments

An FeMo-alloy-doped β-SiAlON (FeMo/β-SiAlON) composite was fabricated via a reaction-bonding method using raw materials of Si, Al₂O₃, AlN, FeMo, and Sm₂O₃. The effects of FeMo on the microstructure and mechanical properties of the composite were investigated. Some properties of the composite, including its bending strength at 700℃ and after oxidization at 700℃ for 24 h in air, thermal shock resistance and corrosion resistance to molten aluminum, were also evaluated. The results show that the density, toughness, bending strength, and thermal shock resistance of the composite are obviously improved with the addition of an FeMo alloy. In addition, other properties of the composite such as its high-temperature strength and oxidized strength are also improved by the addition of FeMo alloy, and its corrosion resistance to molten aluminum is maintained. These findings indicate that the developed FeMo/β-SiAlON composite exhibits strong potential for application to molten aluminum environments.     

促进型Pt/C类催化剂对甲醇的电氧化作用

研究了硅钼酸、磷钨酸促进型Pt／C类催化剂对甲醇的电氧化作用．采用循环伏安法和线性伏安法考察了催化剂的制备方法、添加剂、甲醇浓度、反应温度等因素对催化剂活性的影响,并用XRD和EDS技术对催化剂进行表征．结果表明：Mo含量(质量分数)为7．87％的Pt—Ru—Mo／C催化剂的活性为Pt—Ru／C商品催化剂(E—TEK)活性的1．65倍;添加硅钼酸和磷钨酸可以使得活性组分的分散度提高,从而显著提高催化剂的活性和抗毒性能．     

用硫酸联氨还原、硫酸铈铵滴定钼的研究

本文用硫酸联氨还原、硫酸铈铵滴定测定钼酸铅试样中的钼，详细探讨了还原钼时的酸度和硫酸联氨用量、滴定钼的酸度、测定钼量、外加离子等试验条件。用选择条件测量约含１０ｍｇ钼酸铅试样，误差小于０．５％，相对标准偏差为０．２％。方法可用于测定用钼酸铅沉淀法初分离出来的、含有某些杂质的钼酸铅中的钼，也可用于钼溶液浓度的标定。图５，表１，参３。     

河南栾川县松树台钼钨矿床及其控矿岩体地质地球化学特征

松树台隐伏钼钨矿位于著名的南泥湖钼矿田黄背岭钼成矿带内,区内小型酸性侵入体广泛分布,断裂构造发育,成矿背景好。矿体产于三川组大理岩与花岗斑岩的接触带,矿石类型包括大理岩型钼矿石、矽卡岩型钼矿石和花岗斑岩型钼矿石。钼、钨资源储量达到中型规模,矿石品位较高,钼平均品位0.12%,伴生钨平均品位0.08%。黄背岭似斑状花岗岩与成矿关系最密切,该岩体为高硅—富钾的钙碱性岩石,SiO2平均含量73.83%,Na2O+K2O平均含量8.97%,σ=2.01~3.283.3;轻稀土元素相对富集,Ce、Eu负异常明显,δEu平均0.40,δCe为0.56~0.78;Sr、Ba亏损较大,大离子亲石元素相对富集。这些特征与南泥湖及上房岩体相似。综合认为松树台钼钨矿床与南泥湖及上房钼矿类型一样为斑岩—矽卡岩型钼矿床。矿体深部未封底,有较大的找矿增储潜力。     

水杨基荧光酮荧光猝灭法测定茶叶中微量钼

在HCI介质中.吐温80(Tween80)存在下.钼与水杨基荧光酮(SAF)形成复杂配合物使荧光熄灭.由此建立了测定微量钼的荧光熄灭新方法.该体系的最大激发波长λex=365mm,最大发射波长λex =518mm.Mo(Ⅵ)含量在0-25 ug/25mL范围荧光熄灭程度(△F)与Mo(Ⅵ)浓度呈线性关系,线性回归方程为△F=24/4c(ug/25mL)-0.246.相关系数R2=0.9995,检出限为1.32ug/L.该方法灵敏度高,选择性好,用于测定茶叶中的微量钼,回收率在98.2%~100.3%之间,结果令人满意.     

三烷基胺和磷酸三丁酯于盐酸介质中协同萃取铼(Ⅶ)研究

研究了三烷基胺(N235)和磷酸三丁酯(TBP)从盐酸介质中对铼的协同萃取．N235和TBP的浓度比为1∶9时混合萃取体系对Re(Ⅶ)具有较大的协萃作用,最大协萃因子为4.71,对Mo(Ⅵ)的协萃因子为2.16．在pH=1时,萃合物的组成为(R3NH+Cl－)2·HReO4·B,当酸浓度为3 mol·L-1时,萃合物的组成为(R3NH+Cl－)·HReO4·B,而N235单独萃取时萃合物的组成为R3NH+ReO-4．同时证明了混合萃取剂分离钼和铼的协萃效果和萃取能力．     

Thermodynamic study and methanothermal temperature-programmed reaction synthesis of molybdenum carbide

Nanostructured molybdenum carbide (Mo₂C) was successfully prepared from molybdenum trioxide (MoO₃) using methanothermal temperature-programmed reaction. Thermodynamic analysis indicated that in presence of methane, the formation of Mo₂C from MoO₃ occurs through the path of MoO₃ → MoO₂ → Mo₂C. The carburized MoO₃ was characterized using X-ray diffraction (XRD), CHNS/O analysis, Brunauer–Emmett–Teller (BET) analysis, and field-emission scanning electron microscopy (FESEM). At final carburization temperatures of 700 and 800℃ and at methane contents ranging from 5vol% to 20vol%, Mo₂C was the only solid product observed in the XRD patterns. The results indicated that the effect of methane content on the formation of the carbide phase is substantial compared with the effect of carburization time. Elemental analysis showed that at a final temperature of 700℃, the carbon content of carburized MoO₃ is very close to the theoretical carbon mass percentage in Mo₂C. At higher carburization temperatures, excess carbon was deposited onto the surface of Mo₂C. High-surface-area Mo₂C was obtained at extremely low heating rates; this high-surface-area material is a potential electrocatalyst.     

化学镀Ni-B或Ni-P镀层与油溶性有机钼添加剂的协同效应

在45调质钢基体上化学镀Ni-B合金或Ni-P合金镀层.在基础油润滑下,Ni-B合金或Ni-P合金镀层比45钢耐磨性均提高4.1倍,但摩擦系数却分别增加16.3%,20.35%.在基础油中加入3%的二烷基二硫代磷酸钼(简称MoDTP).结果表明,与未加MoDTP的45钢相比,Ni-B、Ni-P镀层耐磨性分别提高12.8倍,7倍,摩擦系数分别降低54%,51.2%,说明Ni-B或Ni-P镀层与MoDTP有良好的协同效应.     

双波长系数倍率法同时测定钼和钨

痕量钨、钼与芦丁在混合表面活性剂（ＣＴＭＢ＋Ｂｒｉｊ－３５）存在下,于ｐＨ５．４ＨＡｃ－ＮａＡｃ介质中发生灵敏的显色反应,但形成的胶束配合物的吸收峰严重重叠,应用双波长系数倍率法同时测定了混合样中的两组分。