In view of low separation factor of La（ Ⅲ ） and Ce（ Ⅲ ） in P204-HCl system, study was made of the effects of the feed solution acidity and citric acid（H3cit） concentration on the distribution ratio and the separation factor of La（ Ⅲ ） and Ce（ Ⅲ ）and the extraction capacity. The mechanism of the increase of the La （ Ⅲ ） and Ce（ Ⅲ ） separation factor was analyzed by FT-IR method. The experiment results showed that in P204-HCl-H3cit system,La and Ce distribution ratio and separation factor were lower with higher acidity but higher with higher citric acid concentration, while RE element extraction capacity was increased with higher citric acid concentration. With acid concentration 0.25 mol/L and feed acidity pH = 1.0, La and Ce separation factor was 4.1 ,and the maximum RE element extraction capacity was 24 g/L,which was superior to saponified P204-HCl system with the same acidity.

The enrichment and recovery of tantalum and niobium through acid leaching and sodium alkali fusing from tungsten residue is studied. When 5 % HCl consumption amounts to 2.5 times of the theoretical value,reaction temperature is 40 ℃ and reaction time is 30 min,72.1% of the iron and 74.7% of the manganese can be removed and the recovery of tantalum and niobium are 92% and 84.6% respectively. Then the acid leach residue was fused in NaOH and Na2CO3. When the mass ratio of acid leach residue to alkali is 3 ： 2 and reaction time is 60 min,the content of Ta2O5 and Nb2O5 in the product could be 0.48% and 2.74% respectively. And the recovery of tantalum and niobium are 83 % and 74.8 % respectively. The total recoveries of tantalum and niobium are 76.4% and 63.3% respectively. It shows that tantalum and niobium can be effectively enriched and recovered from tungsten residue by acid leach and sodium alkali fusing.

The injection molding of cemented carbide powder has been numerically simulated by CFX software based on the two-fluid model, and the segregation during the PIM filling flow process has also been analyzed. The results show that the segregation is divided into the common segregation and boundary segregation. The common segregation is caused by the differences of density and viscosity between powder and binder. Because the density of binder is less than the powder, a light concentration of the binder around the jet mostly has been caused. Moreover, the effective viscosity of the binder is less than the powder, which causes the increase of the content of binder in the front. The boundary effect and the common segregation together caused the boundary segregation, which leads to the volume fraction of binder near the die wall more than its mean value. The results of the local density test have demonstrated the reliability of the numerical simulation of segregation based on the two-fluid model.

The sublimation characteristics of molybdenum in the sample is studied with tube electric furnace. The result shows that the rate of sublimation of molybdenum is distinctly increased with higher temperature and higher molybdenum grade in carbon molybdenum. At 1 200 ℃ ,the sublimation of Mo in carbon molybdenum ore （with Mo≥3 %） can reach 〉88 %. And molybdenum sublimation of various grade of carbon molybdenum ore can reach 99.6% at 1 400 ℃. The higher the ore grade,the higher the sublimation rate. Temperature has a great impact on purity of MoO3. When the temperature is lower than 1 200 ℃,purity of MoO3 is over 96. 9%. And when the temperature is over 1 400 ℃, purity of MoO3 decreases to 87.3%.

Chemical analysis and thermogravimetric analysis is made of La slag from La thermal reduction of Sm2O3 to obtain Sm recovery from the materials in the different parts of the pot. The relationship between temperature/pressure gradients and Sm recovery is discussed based on the test results.

Using titanium tetrachloride （TiCl4） as a precursor, titania nanoparticles were synthesized in the diffusion flame of air and hydrogen. TEM, XRD,DSC-TGA was used to characterize the properties of the synthesized particles. The photocatalytic property of titania nanoparticles was also studied in this paper. The experimental results indicated that the mean particle size of titania at optimal experimental conditions were about 10-20 nm,and were dispersed uniformly and were not aggregated. And results show that the synthesized titania nano-particles have good photocatalytic activities.

Brief description is made of Ta-10W alloy good performances, future applications and preparation methods. Through study of the relevant metallographical structure and mechanical property,the recrystallization annealing temperature of Ta-10W alloy is determined as follows：1 500 ℃ for broken-down extrusion rod and 1 450 ℃ for cold deformed （78%） extrusion rod.

Surface lipophilic modification of nano-SiO2 in ITO film with dichlorodimethylsilane is made. The dispersity of the modified nano-SiO2 in acrylic resin and its effect on the dispersion system is investigated. The results show that the modified nano-SiO2 has a uniform particle size distribution. The transmittance of the system with 2%-3% SiO2 ,which is dispersed by high speed first and then ultrasonic wave,is the minimum and its stability is the highest.

In view of abnormality of about 200 ℃ temperature drop in the bottom of the sintering box during pressure sintering （after argon charged into the furnace） with imported pressure sintering furnace, analysis is made of the cause of the fault,and technical upgrading option is given together with a serials of specific measures. The performance of the upgraded equipment indicated that the partial temperature drop can be controlled within 5 ℃ with a great improvement in ultra-temperature safety of the furnace wall.

The latest development of multi-element alloying of Nb-Ti-Si-based alloys is described. The effects of alloying on the improvement of microstructure and oxidation resistance of Nb-Ti-Si-based alloys are reviewed.