The steps are introduced of rapid hardening strip casting,hydrogen decrepitation, sintering and heat treatment and alloying element doping in the current preparation of sintered Nd-Fe-B permanent mag- net, and their latest development is also reviewed. The possible development direction of sintered Nd-Fe-B permanent magnet industry is pointed out.

Based on two-phase composite magnetic abrasive prepared from Fe powder and A12 03 powder, heat transfer model of its hot pressing process is built. Mould temperature field is analyzed by computer simulation,and then the hot pressing process is optimized. Simulation results show that furnace heating rate have a great effect on mould temperature field,and temperature field distribution of the abrasive in dif- ferent mould location is also different. In view of abrasive preparation efficiency and laboratory equipment requirements,the heating rate is determined to be 10~15 ~C/min at low temperature and 5~10 ~C/min at high temperature. And abrasive should be placed in z5 region of the mould,in order to reduce its axial tem- perature difference in the hot pressing forming process and improve its physical and mechanical properties.

The latest achievements and progress of LiNi1/3 their synthesis technology and doping and surface modific cific capacity,excellent cycle performance and lower cost. Col/3 Mnl/3 02 cathode materials are reviewed in ation,and these cathode materials have high spe- Their development trends are also forecasted.

Three kinds of cemented carbide materials with different Co and Cr3C2 content were prepared by powder metallurgy. The crystal grain size, hardness and bending strength of the materials were measured at room temperature. Metallographic microstructure and fracture morphology of the materials were observed under SEM. The results show that with the content of binder phase Co in cemented carbide increasing, the hardness of the material decreases, but the bending strength increases. Trace Cr3 Cz in the cemented carbide can refine crystal grain,and adding trace CraC2 into high-Co-content cemented carbide is a good way to ob- tain the material with excellent comprehensive performance of high hardness and high bending strength.

Hot-press sintering process for cemented carbide preparation was investigated with ultrafine WC- Co composite powder prepared by in-situ reduction as the raw material. And the physical and mechanical properties of the samples were also analyzed. The results show that after ultrafine WC-Co composite pow ders with average particle size of about 300 nm,are sintered in hot-pressing furnace at 1 370℃ for 1.5 h, sub-micron WC-Co cemented carbide is obtained with average grain size of 600 nm,relative density of 99% and excellent comprehensive mechanical properties.

The factors affecting carbon determination in beryllium metal were studied by high-frequency heating infrared absorption spectrometry. The influences of fluxes on carbon release from beryllium powder were emphatically investigated such as tungsten and tin particles, and tungsten and copper particles. The results show that carbon can be completely released under the conditions of 100 mg beryllium powder sam- ple and 1.8 g tungsten and tin particles as the flux. When the carbon content in beryllium powder is 800μg/g,the relative standard deviation is less than 4. 0%, and the standard recovery of carbon is 980/00 102%.

Mercury catalyst industry in China is facing the problems of resource shortage, more stringent requirement of environmental protection,demand and production contradiction highlighted and so on. These problems are analyzed and the countermeasures are proposed including scientifically using mercury resources,modifying and improving the mercury catalyst standard in time as well as improving production technology, effectively managing main application links and developing low-mercury catalyst and new catalyst.

由长沙有色冶金设计研究院有限公司与豫光金铅股份有限公司联合研究开发的铅高效清洁冶金和资源循环利用关键技术及其产业化项目,在2010年获中国有色金属工业科学技术奖一等奖的基础上,近日再获国家科学技术进步二等奖。

湖南稀土金属材料研究院始建于1958年，为国有独资科技型企业，是我国最早从事稀土材料应用研究与开发的单位，是军工稀土新材料研制开发的配套单位。该院已通过军品科研生产许可认证和ISO9001中国质量认证。

The main raw materials of Se extraction are introduced.The latest development and application of selenium extraction both at home and abroad is elaborated.The characteristics of Se pyrometallurgy and hydrometallurgy are analyzed.Compared with pyrometallurgy,Se hydrometallurgy has the advantages of low energy consumption,clean and environmental-friendly production and low operating cost.Therefore,hydrometallurgical process will gradually replace the pyrometallurgical process as the dominant process for Se extraction.