with M 115 reagent,good results for removal of the Mo and other impurities from commercial tungstate solution are obtained. The Mo removal rate can reach 97%～99% for commercial (NH 4) 2WO 4 stripped solution containing Mo 0.56～1.75g/L. Besides, As and Sn can also be removed after evaporation crystallization of the purified (NH 4) 2WO 4 solution, the resultant APT can conform to GB 10116-88APT-0 standard at 95.5%～98.7% crystallization rate. Meanwhile it results in a very simple and effective method to recover the NH 4Cl and WO 3 from mother crystal solution and to decrease the “three wastes” discharge

A new technology is found for Ge extraction. The resultant Ge recovery reached over 75%,while the conventional distillation of Ge enriched material can only result in 30%～40% of Ge recovery.

The application and study of spheroidal W powder both at home and abroad is reviewed in the paper In order to produce the spheroidal tungsten powder at high efficiency and low cost, a modified conventional plasma equipment as well as the spheroidization process was investigated in lab. FSSS 15 μm tungsten powder was sent into the induction coupled plasma torch with H 2. The torch was initiated with pure Ar. After melting in the plasma torch, the molten W particles were directly injected into the water for cooling As a result , well spheroidized powder was obtained.

The transitions of lead oxide and BaCO 3 during the heating are researched in this paper;BaPbO 3 ceramic powder has been prepared by means of solid phase method with BaCO 3 and Ph 3O 4 as the raw powders. The influences of calcination temperature and the heating rate on the powder's phase composition are investigated by X ray diffraction and scanning electron microscope Proper synthesis of BaPbO 3 temperature is determined for solid phase preparation

The Indium Tin Oxide(ITO) powder has been produced from Indium and SnCl 4. By selection of coprecipitation medium and control of the technology, the powder was prepared. It is characterized by means of TEM and BET. The results show that it is nanometer dispersive spherical powder with about 16nm particle size.

From the X ray diffraction of Sr 4Al 14 O 25 ∶Eu,Nd noctilucent sample powder,its mixed crystal structure is confirmed. Eu 2+ has replaced Sr 2+ in the matrix while Nd 3+ has replaced Al 3+ . The appearance and size range of the sample is determined by SEM.

The service life of screw steel wire rollers can be remarkably raised by using WC steel bonded carbide and suitable heat treatment technology.

The study was carried out on the two WC Fe/Ni/Co cemented carbides whose binders are Fe+Co+Ni (10%) and Fe+Co+Ni(20%). The influence of elements of Fe, Ni,and their contents in the materials on mechanical properties and chemical stability was in vestigated. The experimental results show that Co could be successfully replaced by optimum Fe/Ni/Co binder using “dual grain structure” wet grinding process.

With the addition of rare earth,the effect on coefficient of expansion of cemented carbides, relative percentage and lattice constant of face centred cubic β Co were investigated.

The mechanical behavior of Mo 3%Re alloys prepared by PM was investigated. It was observed that the relation between tensile strength and annealing temperature for the alloy wire specimens conformed to linear regression equation in the range of 900 to 1 400 ℃ annealing temperature. The Mo 3%Re alloy by dry wet mixing method exhibited higher tensile strength and higher recrystallization temperature as compared with that by dry mixing method. The recrystallization temperature for the Mo 3% Re alloy wires is around 1 200 ℃.