Effects of different solution and ageing treatment on the microstructure and mechanical property of Ti-15-3 alloy barsthrough metalloscope,TEM and electron tensile test.The results show that the grain size of alloy Ti-15-3 grows rapidly with higher solution temperature and the strength of the alloy decreases with longer solution duration.Compared with various solution processes,the over-all property of 2# process alloy is better.The strength of aged alloy mainly depends on the synthetic effect of grain size of phase α and its volume fraction.Compared with various aging processes,the microstructure and mechanic property of 10# aged process alloy is more satisfactory.

In this paper,the manufacturing process and the present status of laser-level yttria production was described.Based on the production practice of laser-level yttrium,detailed description is made of the relevent flowsheet selection,raw and auxiliary material control,equipment arrangement.

Brief introduction is made to the wet milling-spray drying granulation technology and equipment with analysis made of the main factors affecting the mixture quality in the blending,wet milling,spray drying granulation operations.The main techno-economic indices are evaluated.

Study is made on the condition and analysis method for oxygen determination from doped tungsten powder by pulse heating coulomb testing.The results indicated that the analytical heating temperature of doped tungsten powder controlled by heating current can be identical with that of the tungsten powder.Normally,the heating current is 750～800 A,analysis carrier gas flowrate is 150 mL/min.The flux should be wrapped by Ni-foil.The relative standard deviation is 2%.The method is applicable for production analysis.

EDTA is used to complex and mask wolfram and coexisting impurities,and phosphorus content in solutions from ammonium paratungstate circuit is determined by phosphomolybdenum yellow spectrophotometric method.The analytical results show that the recovery is 102.4%～109.6%,and relative standard deviation 0.50%~2.22%,the detection limit is 5.38 μg/mL.This method has been applied in the phosphorus monitoring and examination in the process of paratungstate production.

Analysis is made of the characteristics of process flowsheets and roasting equipment quite common in the industrial production,such as V-bearing coal stone added with activator and agitated acid curing,etc.Proposals are presented for large-scale commercial roasting equipment and selection of the process flowsheet for the operations of vanadium extraction from the coal stone.

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.