Molybdenum extraction experiments with N235 were carried out from the sulphuric acid leach liquor of Ni-Mo ore. The optimal conditions of extraction and stripping were determined. The results show that the three-stage countercurrent extraction rate is up to 99.7% and one-stage stripping rate 95.5%. The molybdenum concentration in the stripping solution is about 100 g/L, and the direct recovery of molybde- num can reach 98 %. Through the above process, nickel can be separated from molybdenum in the acid leach liquor of Ni-Mo ore and molybdenum enrichment and partial impurity removal are achieved.

Continuous culture of uranium-leaching bacteria was carried out to simulate industrialized bio- heap leaching using a small-scale biomembrane oxidizing tank. The oxidation rate of Fez＋ , the output of bacteria liquid,the contain of dissolved oxygen and the aeration rate of oxidizing tank are studied during the culture process. The forming and aging rules of biomembrane are also investigated.

In view of the high silicon concentration in the alkali leach liquor of carbonaceous shale containing vanadium, most of the silicon was removed by coagulating sedimentation. The results show that under the optimal conditions,that is adding 102 g/L Al2 （SO4）3 solution by 3% the volume of the alkali leach liquor （98 ℃ and pH 10.5）,controlling the final pH value at 9.0,keeping the liquor volume nearly unchanged, and maintaining the liquor temperature for 1 h, the silicon removal rate is up to 90 % and vanadium loss rate less than 1.5%.

La0.80Mg0.20Ni3.75 alloy was prepared by intermediate frequency induction vacuum melting （IM） or spark plasma sintering （SPS）. The results from XRD show that both the alloys prepared by the two technologies contain the main phases of LaNi5 and （La, Mg）2Ni7. In addition, the alloy from IM technology （IMLa alloy） contains （La, Mg）Ni3 phase,and the alloy from SPS technology （SPSLa alloy） contains Ni and La2Mg17 phases. The results of electrochemical performance test indicate that IMLa alloy is of higher discharge capacity, loss angle and limiting current density as anode materials of Ni-MH batteries,but the cycle performance of SPSLa alloy is better. SPSLa alloy is of fine grains, homogeneous mierostructure and dis- persive Ni and La2Mg17 phases,so its electrode shedding degree weakens and cycle stability improves.

CaTiO3：Pr3＋ was prepared by high-temperature solid phase carried out with H3BO3. Its emission spectrum, glow brightness and fluences of H3BO3 content on the emission intensity and luminescent discussed. The results show that the prepared CaTiO3 ： Pr3＋ is of the method, and doping afterglow time were modification was studied. The inperformance of CaTiO3 ： Pr3＋ were optimal afterglow performance when H3BO3 is at 15% molar fraction

Al-Ti-B-RE refiner was prepared by fusion casting. The influences of remelting temperature and times on the morphology and distribution of the second-phase particles and on the refinement result of Al- Ti-B-RE refiner were studied. The results show that the dispersive second-phase particles are aggregated after remelting,and gradually transform into massive, clubbed and acicular-flaky phase from fine particu- lates with the increase of remelting temperature. The refiner is hardly affected with remelting times, and still with refinement ability after remelted for many times.

The corrosive effects of the additives in WEDM working liquid on cemented carbide were studied by SEM and EDX. Some additives were selected as the cobalt leaching inhibitors. The results show that tri- ethanolamine in the working liquid can promote the leaching of cobalt from cemented carbide, while trietha- nolamine oleate, borax and benzotriazole can obviously inhibit cobalt from leaching.

The thermal fatigue tests of Co-P alloy coating prepared by electrolytic plating were performed on a self-restraint thermal fatigue testing machine. The initiation and propagation mode of the thermal fatigue cracks, which were on the surface of the coating and caused by thermal stress, and their morphology were investigated by optieal microscopes and scanning electron microscopes. The results show that there is plas- tic deformation near V-notch after 200 thermal cycles, and the thermal fatigue cracks initiate at the bottom of V-notch and propagate in the thermocycling direction. The initiation and propagation mechanism of the cracks are emphatically analyzed.

SiC whiskers were synthesized with SiO2 powders, graphite and NaaAlF6 as the raw materials. The products were analyzed by XRD and SEM. The results show that the products synthesized with Si/AI molar ratio of 4 ： 1 and at 1 500 ℃ is of the best quality. The whisker synthesis mechanism is discussed. It is presumed that the whisker growth follows VS mechanism and Na3AlF6 doesn＇t react during the actual synthesis process. About 0. 005 supersaturation degree of the gas reactants is calculated,as is good for the growth of whiskers.

In view of the low vanadium and carbon content of Huangshan carbonaceous shale in south An- hui, a new process of flotation decarburization-underlying vanadium ore roasting-acid leaching-vanadium extraction is proposed,where the carbon refers to the washed coal. Production practice shows that the total vanadium recovery of the process can be up to 75.10% ,and the quality of the obtained V2O5 product meet the GB 3283--87 metallurgy 98 level. This process can not only improve the vanadium recovery but also achieve the carbon comprehensive utilization of carbonaceous shale.