1999年钼市回顾与2000年钼市展望

回顾了１９９９年世界钼市的状况并展望了２０００年世界钼市的前景。     

金堆城钼矿南露天分期扩帮方案可行性探讨

根据金堆城钼矿小北露天的生产现状,论述了南露天扩帮过渡的迫切性。同时分析了南露天全境界扩帮和分期扩帮的可行性。     

等离子技术与钼冶金

等离子技术是60年代发展起来的一门高新技术.它具有温度高、热流密度大、气氛可控等特点,它为钼的提取及冶炼提供了一个新的的热源.通过在钼冶炼中采用等离子技术进行了多项科研和探索,取得了突破性进展.     

俄罗斯钼业一瞥

介绍了CII选厂铜、钼、硫分离的新工艺,用异丙基黄药作铜矿捕收剂,在70℃石灰介质中,充气氧化抑制黄铁矿,在热硫化钠介质中浓缩脱药,使铜钼分离.还介绍了制备纯二硫化钼及钯钼催化剂的新方法等.     

Graft polymerization of vinyl monomers from initiating groups introduced onto polymethylsiloxane-coated titanium dioxide modified with alcoholic hydroxyl groups

The grafting of vinyl polymers onto the surface of polymethylsiloxane-coated titanium dioxide modified with alcoholic hydroxyl groups (Ti/Si–R–OH) were investigated. The introduction of azo and trichloroacetyl groups onto the surface of Ti/Si–R–OH was achieved by the reaction of the surface alcoholic hydroxyl groups with 4,4′-azobis(4-cyanopentanoic acid) and trichloroacetyl isocyanate, respectively. The radical polymerizations of vinyl monomers were successfully initiated by the azo groups introduced onto the surface and by the system consisting of Mo(CO)₆ and Ti/Si–R–COCCl₃. During the polymerization, the corresponding polymers were effectively grafted onto the titanium dioxide surface through propagation from surface radicals formed by the decomposition of azo groups and by the reaction of Mo(CO)₆ with trichloroacetyl groups on the surface. The percentage of grafting and grafting efficiency in the graft polymerization initiated by the system consisting of Ti/Si–R–COCCl₃ and Mo(CO)₆ were much larger than those initiated by azo groups. The polymer-grafted titanium dioxide was found to produce a stable colloidal dispersion in good solvents for the grafted polymer. The dispersibility of poly(N,N-diethylacrylamide)-grafted titanium dioxide in water was controlled by temperature. In addition, the wettability of the surface of titanium dioxide to water was readily controlled by grafting of hydrophilic or hydrophobic polymers.     

钼电极与玻璃电熔炉中各组份作用的热力学计算

通过计算钼电极与玻璃中各组份的反应自由能,不需要做实验就可以确定哪些玻璃成份与钼电极起反应,从而确定熔化哪些玻璃成分的窑不能使用钼电极。     

应用离子交换法从堆浸液中分离回收铀、钼

应用离子交换方法处理含钼铀矿石堆浸液（矿石的钼与铀质量比接近１∶１）可较好地解决了铀钼分离问题,并且从钼淋洗合格液中回收钼质量分数为３０％ 以上的钼产品,沉淀回收率达９６％ 。这样,既获得一定的经济效益,又有利于环境保护。     

Chemical vapour deposition of molybdenum carbides: aspects of phase stability

Thin films of different molybdenum carbides (δ-MoC_1−x, γ′-MoC_1−x and Mo₂C) have been deposited from a gas mixture of MoCl₅/H₂/C₂H₄ at 800°C by CVD. The H₂ content in the vapour has a strong influence on the phase composition and microstructure. Typically, high H₂ contents lead to the formation of nanocrystalline δ-MoC_1−x films while coarse-grained γ′-MoC_1−x is formed with an H₂-free gas mixture. This phase has previously only been synthesized by carburization of Mo in a CO atmosphere and it has therefore been considered as an oxycarbide phase stabilized by the presence of oxygen in the lattice. Our results, however, show that γ′-MoC_1−x films containing only trace amounts of oxygen can be deposited by CVD. Stability calculations using a FP-LMTO method confirmed that the γ′-MoC_1−x phase is stabilized by oxygen but that the difference in energy between e.g. δ-MoC_0.75 and oxygen-free γ′-MoC_0.75 is small enough to allow the synthesis of the latter phase in the absence of kinetic constraints. Annealing experiments of metastable δ-MoC_1−x and γ′-MoC_1−x films showed two different reaction products suggesting that kinetic effects play an important role in the decomposition of these phases.     

表面活性剂存在下催化剂中钼含量的测定

研究了在火焰原子吸收光谱中表面活性剂对钼的增感作用 ,在 5 0mmol/L曲拉通X— 1 0 0(TX— 1 0 0 )和 5 0mmol/L十二烷基硫酸钠 (SDS)存在下 ,可使钼的吸光度增感 48% ,并且能消除Al、Cu、Mn、Ca、W、Fe、P、V 8种元素对钼的测定干扰。在聚四氟乙烯压力溶弹内 ,用王水作溶剂溶解试样 ,具有试剂用量少免受污染等优点。用此方法测定钼的检出限为 0 .0 5 7μg/mL ,加标回收率在 98.6%～ 1 0 1 .9%之间 ,相对标准偏差小于 0 .87% ,可直接用于催化剂中钼的测定。     

载能钼团簇束与单晶硅碰撞室温下合成二硅化钼

用一种新型磁控溅射气体凝聚团簇源产生Mon^-团簇束,当团簇束分别在偏压为0、1、3、5、10kV的电场中加速后,沉积在室温下的P型Si(111)衬底上,获得Mo／Si(111)薄膜样品。用XRD分析表明,在室温下,偏压≤5kV团簇束沉积和常规磁控溅射沉积获得的Mo／Si(111)样品,其界面均无二硅化钼(MoSi2)生成;偏压=10kV时,团簇束沉积其界面直接有MoSi2生成。对于团簇束沉积,当偏压大于一定值时(在本实验条件下偏压≥3kV),薄膜才开始以Mo(110)择优取向生长。