Experimental study was made in view of accumulation of the main impurities P, As, Si, Cl ere in the tungsten raffinate recycled to the leaching process, and the effects of two purifiers were tested for the removal of impurities in the aqueous phase during leaching. The results show that direct leaching with un- treated tungsten raffinate results in accumulation of various impurity ions to different degrees. By adding appropriate purifiers and controlling the dosage of sodium phosphate, the concentrate of P is controlled steadily in a certain range and high W leaching rate is achieved.

Description is made of the hazards of waste rare earth phosphors and the significance of rare earth recovery from the phosphors. The compositions of various types of different light-colored rare earth phosphors are summarized. The latest development is reviewed in the respects of the rare earth phosphor extraction from waste fluorescent materials and rare earth recovery from rare earth phosphors. And the ad- vantages and disadvantages of various recovery methods are pointed out, as well as the future development direction.

Development ,principles and characteristics are reviewed of ion exchange technology in tungsten smelting. The latest development of the technology is emphatically introduced. And research direction of ion exchange technology in tungsten smelting is proposed.

Description is made of the process flowsheet and equipment system of tungsten series product preparation by chemical vapor deposition （CVD）, and the products include pure tungsten products of tungsten tube, tungsten crucible and tungsten special-shaped part, and coating products with copper base, tungsten base,molybdenum base and graphite base. The tungsten series products produced by CVD have the following characteristics： high density up to 98.5% of theoretical density,high purity of 99. 999 9% tungsten, particular microstructure of columnar crystal or multilayer columnar crystal, and high bond strength of tungsten with the matrix in the coating products.

The BiFeO3/La0.5Gd0.17Sr0.33CoO3 heterojunction was prepared by pulsed laser deposition on the LaAlO3 substrate, and its optical and electrical properties were investigated. The results show that the La0.3Gd0.17Sr0.33CoO3 film,with a smooth and homogeneous surface, can provide favorable conditions for the growth of BiFeO3 film. At the temperature above 200 K,the BiFeO3/La0.5Gd0.17Sr0.33CoO3 heterojunc- tion shows semiconductor properties, and its resistance decreases with the increase of temperature. The optical band gap of the heterojunction is 3. 543 eV,so it has photo induced carriers generated by UV laser irradiation at room temperature.

Preliminary measuring and analysis were made of hydrogen concentration in liquid lithium-lead alloy. The results indicate that hydrogen dissolution in liquid lithium-lead alloy has the characteristic of over-saturation,and the measuring curves are non-linear. It is feasible to extract hydrogen isotopes from liquid lithium-lead alloy by gas-liquid carrier. The influence of hydrogen partial pressure is much greater than that of lithium-lead alloy melting temperature on hydrogen solubility in liquid lithium-lead alloy.

The lattice parameters, bond lengths of B-O, electronic population, energy band structure, density of electronic states and absorption spectrum of B-doped anatase TiO2 were calculated using the first-principles based on the density functional theory. The results indicate that B doping results in lattice distortion and decreased supercell volume of TiO2. The forbidden band width of B-doped TiO2 only slightly decreases by 0.02 eV,and impurity energy levels are introduced in the bottom of its valence band. B doping can promote light absorption of TiO2 in both ultraviolet region and visible region.

Calculation and analysis were made of the effects of Co concentration on the mechanical properties of NiAl alloy based on virtual crystal approximation and using the first-principles pseudopotential plane- wave method. The results from elastic modulus calculation and analysis show that after B2-NiAl crystal is alloyed with Co, its hardness is increased except x （Co） = 2%, and obviously increased in the low concentration range of x（Co）=0-0.5 %, and the increase degree is lower in the high concentration range of x（Co）=3-25%. At the same time, the ductility of B2-NiAl crystal is decreased at first and then increased,decreased only a little at x（Co） =0-0.5% and obviously at x（Co）=0.5%-4 % ,and increased gradually at x（Co） =4%-25%.

Based on the introduction of surface oxide film structure and pickling principle the process,equipments and technical feature of continuous pickling for titanium strip citing the practical project.

Study was made of the effects of deep cryogenic treatment on the phase structure of the cemented carbide with high cobalt content and the properties of the cemented carbide with low cobalt magnetism, by XRD analysis and property testing of the cemented carbides before and after the treatment. The results show that deep cryogenic treatment can cause migration and rearrangement of the atoms in the main phase to be ordered and uniform, improving phase composition of the cemented carbide with high cobalt content. Besides,solid solute atoms of W and C in cobalt phase have more uniform distribution through deep cryogenic treatment, improving solid solution strengthening effects and greatly increasing bending strength of the cemented carbide with low cobalt magnetism.