TiO2-Nx thin films were successfully deposited onto microscope glass slides by RF sputtering technology with different flow ratio of oxygen to nitrogen. Photocatalytic activity of the obtained thin films was evaluated by photodegradation tests of methylene blue. XRD patterns and transmission spectra of the films were determined. The energy band structure and density of electronic states （DOS） near Fermi level of N-doped anatase TiO2 were calculated using the first principle based on density functional theory （DFT）. The results indicate that the TiO2-xNx thin film prepared with 50 sccm O2 flow rate and 0.5 sccm N2 flow rate has the highest photocatalytic activity. Compared with pure TiO2, N-doped TiO2 has no change in crystal structure, but its absorption edge shows red shift. N doping makes the band gap of TiO2 decreased and DOS movement towards the low-energy side, resulting in light response region extended and photocatalytic activity enhanced.

The structural characteristics of perovskite-type metal oxides （ABO3） their photocatalytic mechanism and ap various factors affecting photocatalytic plication res degradation earc photocatalytic of dye with ABO3 are degra descri are introduced, as well as dation of dye. Meanwhile, bed and analyzed.

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2012年12月7日,《稀有金属与硬质合金》杂志理事会第14次会议在主办单位——长沙有色冶金设计研究院有限公司举行。会议由公司技术发展部尹泽辉部长主持,到会的杂志理事会成员有来自全国各地的二十多家高等院校、科研院所及企业的代表。会议开始，杂志理事会理事长廖江南副总兼总工程师作了重要讲话，向代表们的远道而来表示了热烈欢迎，向理事单位长期以来对杂志的支持表示了诚挚谢意。随后，理事会秘书长谌启明副主编作了杂志工作汇报。近三年来杂志的发展主要体现在：（1）《中国科技期刊引证报告》显示，杂志的影响因子已从2009年的0．393提升到了目前的0．512；（2）现为8家国内外著名文摘的文献源；（3）从2005年起杂志被评为中文核心期刊，并于2012年继续保持为中文核心期刊（2011版）；（4）再次入编中国科学引文数据库（CSCD）；

The effects of TaC, Cr3C2 and Mo additives on the microstructure and mechanical properties of WC-Ni cemented carbide were investigated. The results show that the relative density, transverse rupture strength and the hardness of WC-Ni prepared by vacuum sintering at 1 470 ℃/1 h are 99.39% ,1 819 MPa and HRA85,respectively. Proper addition of TaC,Cr3C2 and Mo hard phases to WC-Ni cemented carbide obviously results in finer grain structure, better strength and hardness with average grain size up to 1.03-1.31μm,and the transverse rupture strength is over 2 000 MPa with hardness over HRAg0.

The latest development of machining technology of PM blanks was reviewed,and it was pointed out that the key factor is improving the strength of blanks to meet machinable requirements. The relation- ship was analyzed of cutting parameters control with tool wear and part quality, as well as its influence on machinability and sintering properties of the blanks. The strength of PM blanks of tungsten-based alloy was enhanced through pre-sintering and warm compaction,and their cutting tests were carried out. The re- sults show that pre-sintered or warm-compaction blanks can be processed by clamping and cutting. Pre-sin- tered blanks have better machinability with smooth processing surface and intact edges. The application of blank cutting machining is helpful for extending tool life during production of powder metallurgy parts, saving cost and improving efficiency.

The basic principles of zone melting technology are explained, its latest development and applica- tion are reviewed focusing on the progress of its critical process steps. Description is made of the current applications of zone melting in high-pure materials like semiconductors, refractory metals and rare earth el- ements. Current limitation and future development direction of zone melting technology are also analyzed and pointed out.

Study was made of tungsten extraction from alkaline sodium tungstate solution with the quaternary ammonium salt of tri-n-octylmethyl ammonium chloride （TOMAC） as the extractant. The effects of various conditions on tungsten extraction were investigated such as extractant concentration,DL-2-octanol concentration,phase ratio, extraction time and NaOH concentration of feed solution. And the extraction isotherms were plotted. The results show that the organic phase comprising 50% TOMAC＋20% DL-2-oetanol＋30% sulfonated kerosene has excellent performance of tungsten extraction and phase separation, and extraction equilibrium can be reached within 1 min. Both tungsten extraction rate and WO3-loading saturation capacity of the organic phase slightly decrease with the increase of NaOH concentration of feed solution. The extraction system can meet the requirement for deeply extracting tungsten from alkali soda leaching liquor of tungsten ores.

Vanadium was recovered by two-stage hydrochloric acid leaching of alumina red mud, with vanadium leaching rate up to 97.96%. The resultant leached solution was evaporated,thickened and purified before 3-stage extraction with 100% amyl acetate,with V extraction rate up to 95.67%. 3-stage countercurrent stripping of the loaded organic phase was carried out with 10% NH4OH solution, with vanadium stripping rate up to 97.23%. The product containing 98.50% V2 O5 can be obtained by ammonium salt precipitation and thermal decomposition of stripping aqueous phase, and the overall vanadium recovery is up to 82.69%.

Review is made of technical processes of V2O5 extraction from vanadium-containing carbonaceous shale and their characteristics. It is pointed out that a feasible vanadium extraction process should be ed based on the nature of vanadium-containing carbonaceous shale to obtain more economic and social benefits.