The sintering mechanism and process characteristics of spark plasma sintering process are introduced,focusing on the influences of various process parameters on sintering performance of the above technology.

The latest development of the production process of NdFeB magnetic materials is described.Resource characteristics of RE-containing solid waste generated from NdFeB production are analyzed.The current comprehensive utilization of NdFeB scraps is discussed and then some suggestions are given.

From the aspects of general tendency,the status of patent laws,domestic and overseas distribution,principal patent applicants and technology structure etc,analysis is made of the patent information on the rare-earth luminescent material industry,which are published（announced）by China＇s State Intellectual Property Office in the years of 1985～2012.And development strategy is proposed for rare-earth luminescent material industry.

Type selection and amount of paraffin molding agent were studied,and improvements were made for the shortcomings of the paraffin.There are two main ways to improve paraffin：one is adding the right amount of higher fatty acids into paraffin and the other is adding the right amount of surfactants into paraffin.Paraffin viscosity and pellet rigidity are improved by improving paraffin molding agent,so that the pressing pressure is reduced,the strength of compacts increases,and the cracks are effectively reduced without significant effect on the magnetic saturation,coercivity and flexural strength of the products,resulting in very good applications of the improved paraffin in cemented carbide production and research.

Micron-sized diamond films were uniformly deposited on the surface of cemented carbide vertical keyway milling tools with complex shape by hot filament chemical vapor deposition,where parallel hot filament arrangement and optimized processes of pretreatment and deposition were adopted.SEM and Raman spectra were employed to study morphology and composition of the diamond films.Milling experiments were carried out with high volume fraction（65%）SiCP/Al composite as the workpiece material.And milling characteristics were investigated and compared between diamond film coated milling tools and uncoated milling tools.The results show that with the same milling parameters,cutting force of diamond film coated milling tools is reduced by 20%～60% compared with uncoated milling tools.With high surface adhesion strength,diamond films effectively reduce tool wear and increase tool life by 3～5 times.During early processing,surface quality of the workpieces from uncoated tools is better,but rapidly deteriorates during later processing.In contrast,surface quality of the workpieces from diamond film coated tools is more stable.

In view of current production status of 1^# bar unit with frequent groove and roller change and low slitting efficiency in Lingyuan Iron and Steel Group Company Section Steel Mill,and in consideration of the cemented carbide assembled roller with high wear resistance and stringent requirement for cooling,the characteristics of slitting rolling are analyzed,and the cutting process and groove cooling scheme are determined for cemented carbide assembled roller.

为了对近几年来稀有金属与硬质合金的资源综合利用、冶炼分离、化合物制备、分析检测、环境保护等新技术、新工艺、新装备、新成果以及产业发展过程中急需解决的问题进行交流和研讨，湖南有色金属学会稀有金属学术委员会、长沙有色冶金设计研究院有限公司、《稀有金属与硬质合金》编辑部拟于2014年第四季度举办第三届稀有金属与硬质合金学术交流会。

The reaction process and mechanism were studied of scheelite synthesis by calcination of wolf- ramite and calcium carbonate. The experimental results show that scheelite begins to form during wolframite calcination at 550 ℃. Wolframite and calcium carbonate can be completely synthesized into scheelite at 800 ℃, and the main products are CaWO4, Fe2O3 and Mn2 O3. Scheelite synthesis reaction in air takes place by two steps. The first step is generation of CaWO4, FeO and MnO, and the second step is oxidization of FeO and MnO into Fe2O3 and Mn2O3.

For development and utilization of a tungsten molybdenum ore, flotation experiments of molybde nite recovery were carried out. According to the nature of the ore,the process is employed of Mo-S mixed flotation-regrinding and separation of mixed concentrate,obtaining molybdenum concentrate with Mo grade of 46.14% and Mo recovery of 80.38%. Compared with the process of preferential molybdenum flotation, Mo recovery rate of the above process is higher.

Experiments were carried out on two kinds of ultrafine WO3 preparation processes, easy to industrialize. The first process is calcining H2 WO4 to prepare ultrafine WO3. The second process is APT thermal dissociation-leaching-spray drying-calcining AMT to prepare ultrafine WO3. The morphology and particle size of ultrafine WO3 from the two processes were analyzed respectively by SEM and nitrogen adsorption. The results show that the second process is characterized by better WO3 morphology and particle size, more convenient production organization, less difficulty in the process control and better working environment. L9 （34） orthogonal experiments of thermal dissociation step in the second process were carried out. The results show that the factors affecting leaching rate of dissociated material have the following descending order：thermal dissociation temperature, feed rate and thermal dissociation time. Calcination experiment was carried out with the same batch of spray drying material,to research the influence of AMT calcination temperature on Fisher particle size and specific surface of WO3 powders. As a result, ultrafine WO3 powders are obtained with BET size of 75 nm. The results show that calcination temperature slightly influences Fisher particle size of WO3 powders, but strongly influences their specific surface. Lower calcination temperature is helpful for ultrafine WO3 preparation.