China＇s present titanium resource and production technique status of titanium-enriched product, tidioxide and titanium sponge are analyzed. Combined with the progress of the world titanium industry research and development, the key technical problems to be solved and development direction of China＇ s titanium industry are pointed out.

The phosphor SrAl2O4∶Eu^2＋,Dy^3＋ was prepared by high-temperature solid-state synthesis with aluminium hydroxide as the aluminate-containing material, and the aluminium hydroxide was prepared from industrial sodium aluminate solution. The effects of rare earth dosage, sintering temperature and H3BO3 dosage on luminescent properties of the phosphor were investigated. The samples prepared under the optimal conditions were characterized by XRD patterns and afterglow decay curves. The results show that under the conditions of x（Eu）=3%, x（Dy）=3%, sintering temperature 1 300 ℃ ,sintering time 4 h and w（HaBO3 ） - 9%, the prepared phosphor remains in the crystal structure of SrAl2O4, its luminescent properties is the best and brightness is the highest with a main excitation wavelength of 360 nm and a main emission wavelength of 510 nm. The afterglow of the phosphor is yellowish green, and its decay time is long.

In view of coarse grains of in-situ synthesized Al2O3 particle enhanced molybdenum-based composite material, the composite grains are refined together with sol-gel method and high energy ball milling technique. The microstructure of Al2O3/Mo composite powder and composite material prepared by different milling processes were observed and analyzed by XRD and SEM. The results show that with milling time increasing,the appearance of the composite powder particles changes from ball shape to lamel shape and then to small ball shape,particle size changes from around 1.5 μm to 500 nm, and the molybdenum grains are refined gradually. Both dispersibility and refinement degree of the powder prepared at high ball/ powder weight ratio are better. Improved milling speed results in reduced uniformity of powder particle size and powder agglomeration, hindering powder refinement. Nanoscale Al2O3 enhanced molybdenum-based composite material can be obtained by pressing and sintering and with the composite powder prepared under the conditions of ball/powder weight ratio 5 ： 1,rotation speed 300 r/min and milling time 60 h.

Impact fatigue performance of fine kinds of common stamping die cemented carbides was tested by small energy multiple impaction,and then analyzed based on Weibull distribution. Fracture surface was observed by SEM. The results show that there are three distinct areas on the fracture surface of the cemented carbide after multiple impaction,including a little rough region of stable crack growth, bright field of rapid crack propagation, and smooth area of final fracture. The impact fatigue performance is the best of WC-20% Co cemented carbide with an average grain size of 1.4 μm.

Influences of technological factors and their interaction on the hardness and transverse rupture strength of coarse-grained cemented carbide were investigated by variable search method, and the factors includes alloy carbon content,sintering process, cobalt content, binder phase composition, ball to powder ratio and milling time. The results show that cobalt content and milling time are the main impact factors of hardness, while sintering process,ball milling process and binder phase composition mainly influence alloy strength. The coarse-grained cemented carbide with fewer defects, more uniform binder phase distribution and higher strength can be obtained by appropriately increasing sintering temperature.

WC powder and cemented carbide blade were soaked in distilled water and sodium carbonate solution in the experiment. Influencing factors and mechanisms of WC leaching from cemented carbide were researched by SEM and EDX. The results show that both water and sodium carbonate can lead to WC leac- hing from cemented carbide,and the effect of sodium carbonate is more obvious at higher temperature. WC leaching can be attributed to the presence of such ions as H＋ ,OH- and HCO3- in cutting fluid, and tungsten enters into the solution finally in the form of WO4^2- detached from the blade surface.

Based on tantalum （niobium） carbide production by carbonation, production technoligical factors are analyzed of ultrafine tantalum （niobium） carbide powder for cemented carbides. Quality control key elements of the product are summarized, and specific improvement measures are suggested.

Silver nanoparticles with an average diameter of 30 nm were prepared by microwave radiation, with silver nitrate as the silver source,hexamine as the reducer and polyvinylpyrrolidone as the surfactant and stabilizer. Crystal structure and morphology of the samples were characterized by XRD and TEM. The structure of the samples was qualitatively analyzed by IR spectra, and the optical properties were studied by UV-Vis spectrophotometer. The results show that the above method is simple and fast, and the prepared silver nanoparticles are pure cubic polyerystal with small size, narrow particle size distribution and good dispersibility.

Molybdenum removal experiments of simulated molybdenum-containing wastewater were carried out with fly ash as the absorbent. Influences of absorption pH and absorbent dosage on adsorption results were studied, and the adsorption isotherm equation and kinetics were discussed. The results show that the adsorption effect of fly ash for molybdenum is best with a molybdenum removal rate of 74.3 %, under the conditions of molybdenum initial concentration 10 mg/L and pH=8.1. The addtion of 2.5 g absorbent into 50 mL molybdenum-containing solution resultes in optium molybdenum removal up to 85.4%. Molybdenum adsorption on fly ash conforms with Langmuir adsorption isotherm equation, dominated by surface single-molecule layer adsorption. The adsorption kinetic data are fitted with second-order kinetic model, representing the characteristics of both physical adsorption and chemisorption.

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。