Ce0.8Gd0.2O2-δ electrolyte for solid oxide fuel cellI （IT-SOFC）δ was prepared by co-precipitation method. Its properties are tested. The XRD measurement shows that the powder from precursor calcination is of mono-cubic fluorite-type structure. SEM testing shows that the calcination temperature has important influence on powder morphology and density of the sintered body,relative density of which reached 96.4% upon sintering at 1 350 ℃. And the results of impedance spectroscopy showed that ionic conduction of the said electrolyte reached 0. 003 S/cm at 700℃.

Electrolytic cell system for ultrasonic electro-oxidation of molybdenite was studied and designed. The preliminary explorative test results show that effective oxidation decomposition of molybdenite concentrate under electric and ultrasonic field can be realized by using new type of agitator-tank electro-chemical reactor（through out-field enhancement by ultrasonic probe, use of high-performance electrode materials, in-cell mechanical agitator and so on）.

Vanadium is extracted out of stone coal from a mine in An Hui by hydrometallurgy. Study is made on the effect of leach time,ore particle size,temperature and acidity on the vanadium leaching rate. The resuits showed that vanadium leaching rate increased with the increase of temperature and acidity; and decreased with the particle size〈0. 154mm. The maximum V leaching rate can reach 81%.

In view of potential leakage from powder compaction during carbide production,a new unit is developed matched to 2-way press. The actual performance of which showed that this unit can reduce powder leakage, and timely recover the leaked powder for reuse so as to effectively control the powder leakage.

Simulation and prediction is made of WC-Co cemented carbide hardness through BP （Back-Propagation Network） neural network. The results showed that the method can exactly predict the relationship between the hardness of WC-Co cemented carbide and its constituents.

The carbide gun drill specimens are prepared with HF-induction brazing technology at different brazing temperature and under different heat treatment conditions. Self-made unit is used to test the degree of shear rupture. The microscopic study of the joint presented the law of influence of brazing temperature and heat-treatment temperature on the joint strength.

The effect of Ca/Y modification on damping behavior of Mg-0.6Zr alloy are investigated by dynamic mechanical analyzer and the damping mechanism depended on strain amplitude and temperature is al- so analyzed. The results showed the alloy tensile strength and elongation is improved by fine-grain intensification and solid solution intensification upon modification with the addition of Ca/Y 0.3 %Ca,0.3%Ca＋0.1%Y（mass %）. Meanwhile,the addition of Ca/Y and further impediment of the dislocation movement due to more grain boundary has reduced alloy strain amplitude effect,resulting in lower damping performance. It is also found out that distinct damping peak（P1 ）appears in Mg-0.6Zr alloy at 75 ℃ while the modi- fication with the addition of 0.3 %Ca＋0.1%Y suspends the damping peak. The damping mechanism of the tested alloys could be explained as mechanism of G-L dislocation damping model and viscous sliding and softening of the grain boundaries.

Based on the analysis of In raffinate composition,three process design proposals are presented for In raffinate neutralization pretreatment. After comparison, 2-stage neutralization is selected. The paper briefly describes the layout and actual effect of the said process.

Description is made of the practice of As-/NHa/N-containing waste water treatment in W metallurgy in terms of process, principle, process flowsheet, efficiency, existing problems and improvement. The results showed that the waste water from APT production can be effectively controlled with combined process of ＂Lime ferrous salt for As removal;wet-method catalytic oxidation blowing for N removal＂.

Standard solution is prepared with spectral-pure molybdenum trioxide. The relationship curve between molybdenum concentration and absorbency is determined by Thiocyanate spectro-photometrical colorimetry.c= 0. 397 2×A,which is used to analyze molybdenum content in leach solution. And verification is done through the testing of Mo content in the leach able, the relative standard error is O. 34 %. Meanwhile termined with the same method and operating steps. standard error is O. 29 %. residue. The results showed both are well conform able,the relative standard error is 0.34%. Meanwhile Mo content in the waste water from a smelter is determined with the same method and operating steps. The results are also well conformable, the relative standard error is 0. 29 %.