Oxygen-enriched air roasting of vanadium-containing carbonaceous shale was studied, aimed at the influences of oxygen concentration, roasting temperature and roasting time on the vanadium leaching rate. The results show that under the conditions of oxygen concentration of 65%, roasting temperature of 860℃ ,roasting time of 210 min,the average vanadium leaching rate can reach 84.5%, and the total vana- dium recovery is 80.28% in the whole process to produce vanadium pentoxide.

The pressure decompositon of a low-grade refractory tantalum-niobium ore with acid was stud ied. When the type of ore is processed by closed pressure acid decomposition,its decomposition rate of tan- talum-niobium reaches more than 98.5% with decreased consumption of HF,properly increased grinding particle size, lower production cost and strengthened environmental protection. The process is also applied in the treatment of high-grade tantalum-niobium concentrate.

Based on the property differences between beryllium and aluminum, several typical aluminum separation methods are reviewed during beryllium extraction with sulfuric acid. The methods such as pre- cipitation, crystallization, extraction and complexing-masking are introduced in detail. In addition, the fu- ture development orientation of aluminum separation from beryllium is pointed out.

The chemical composition and occurrence modes of rare metals are introduced as well as the latest research of recovery process of rare metals and other valuable metals from red mud in the world. The prob- lems of the recovery process are also presented.

Ti-Nb-Zr-CPP （calcium pyrophosphate） composite was prepared by mechanical alloying and spark plasma sintering,and then the composite was leached in solution to obtain porous biomaterials. Anal- ysis was made of phase and surface area composition of the sintered body,and morphology, relative densi- ty,hardness,pore size and porosity of the leached material. The results show that the porous biomaterials similar with the human skeleton surface can be prepared,with Ti-35GNb-7GZr-10%CPP as the composi- tion formula and 40%H3PO4 ＋60%H20 as the leaching solution.

Sb2S3 nanorod bundles were synthesized by refluxing method and the influences of sulfur source and surface modifier on their structure and morphology were investigated by XRD, SEM and TEM. In addi- tion,the growth mechanism of Sb2S3 nanorod bundles was discussed. The results show that in the ethylene glycol system the pure orthorhombic Sb2S3 nanorod bundles can be synthesized, using thiourea as sulfur source and polyvinylpyrrolidone as surface modifer, and their single nanorods have diameter of approxi- mately 300-400 nm and length of about 5-10μm.

The effects of calcination temperature on MoO3 phase transition were investigated by XRD and SEM,and the electrochemical performance of MoO3 in different phases as tested. The results show that phase transition of molybdenum trioxide powders occurs during calcination at about 400℃, from hexagonal phase （h-MoO3） to orthorhombic phase （α-MoO3）, and powder morphology changes from short rods to small fragments. Used as the positive electrode active material of lithium battery,the initial maximum dis- charge specific capacity of h MoO3 is 171.4 mA·h/g and its capacity retention is 55.8% after 20 cycles. The initial maximum discharge specific capacity of α-MoO3 is 223.1 mA·h/g and its capacity retention is 60.6% after 20 cycles. Therefore,the electrochemical performance of α-MoO3 is much better than h-MoO3

The electronic structures of V doped,N doped and V-N codoped anatase TiO3 were calculated by the first-principles plane wave ultra soft pseudo-potential （PWPP） method （PWPP） based on the density functional theory （DFT）. The effects were analyzed of V and N single doping and V-N codoping on TiO3 band structures, density of electronic states and optical absorption properties. The results show that impu- rity levels produced by doping lead to decrease of forbidden band width and red shift of absorption edge. The V-N codoped TiO2 shows greater decrease of forbidden band width and stronger red shift of absorption edge than V-doped and N doped TiO2 because of the production of impurity levels in valence band top and conduction band bottom.

The double-rolling isothermal hot compression tests of a new metastable beta TB8 titanium alloy were carried out on Gleeble-1500 thermal simulation machine,and the alloy softening behavior was inves- tigated during compression. The results show that when deformation temperature is 750 ℃, the alloy has discontinued yielding behavior in the initial hot deformation stage. Both dynamic softening and static sof- tening happen to the alloy during its double-rolling hot compression, and the dynamic softening rate increa- ses with deformation temperature increasing. Upon the insulation at the rolling interval, the alloy has obvi ous static softening behavior, and the static softening rate increases with increased deformation temperature and rolling interval.

The influence of shot blasting on titanium strip pickling was investigated through the surface morphology analysis and the contrast pickling experiments of shot-blasted and non-shot-blasted titanium strips. The results show that with the decrease of the volume ratio of hydrofluoric acid to nitric acid, the weight loss rates of both shot-blasted and non-shot-blasted titanium strips gradually decrease, while the needed pickling times for both are gradually increased. Under the optimum conditions, the volume ratio of hydrofluoric acid to nitric acid of shot-blasted titanium strip is slightly bigger than that of non-shot-blasted one, but its pickling time is slightly longer. Thus, the strengthening effects of shot blasting on titanium strip pickling is not obvious.