Study is made of the possibility and technical requirements of separating tungsten from high W- containing Na2MO4 solution by Fe （OH）3 adsorption. The results showed that each absorption resulted in 70 % ～80 % tungsten separation from molybdenum at pH = 7.0 and with consumption 2～4 times more than that of WO4^2- . When WO3/Mo = 0. 445, WO3/Mo is reduced down to 0.17～ 0.18 through the first absorption. A new method is developed to neutralize sodium molybdate solution with HCl and NH4Cl as neutralizer, which can notably improve recovery and separating effect.

Study is made of the preparation of niobium suboxide by Nb reduction of Nb2O5 through high energy ball milling. The following two different processes were studied and compared： A. high energy ball mill mixing - acid pickling for impurity removal - vacuum masting; B. high energy ball mill mixing- vacuum, roasting- acid pickling for impurity removal. Analysis is made by ICP and SEM of the impurity content and microscopic morpholcgy of the product. Anode is prepared from niobium suboxide and its electrical property is tested with processes similar to those for tantalum electrolytic capacitor. The resuls show that product prepared by Alternative A is characterized by lower impurity content, less leakage current, lower specific capacity and loss than that by Alternative B, which has specific capacity up to 107 000μF·V·g^-1; the particle size of product by high energy ball milling is fine, and inclined to slice. The entrapped impurity during ball milling is hard to be thoroughly removed in the subsequent washing step, resulting in large leakage current of the anode.

The process for Nano - meter Ce - Zr - O powder preparation was optimized as follows upon investigation of the experimental conditions affecting the product properties through law temperature solid - phase reaction： grinding with ZrOClz（s）,Ce2（CO3）3（s）,NaOH（s）as raw materials and salicylic acid as complexing agent to obtain precursor, which is dried under room temperature and calcined at 600 ℃ to obtain Nano - meter Ce - Zr - O powder. The sample powder characterization is tested by XRD, TG - DTA, and Raman spectrometer in respect of its particle size, physical phase, thermal stability and Raman feature.

The effect of oxygen on the microstructure and mechanical properties of 95W - 3.15Ni - 1.35Fe - 0.5Co alloy was studied. The results showed that oxygen mainly segregated on the edge of crystalline grain of tungsten and the surface of remained apermre,which appeared easily in the place where the oxygen segregated.The atomic diffusion of Fe.Ni.Co and the sintering kinetic force were influenced by oxygen. Hydrogen pre - sintering process can be used for oxygen removal so as to improve the mechanical properties of W alloy.

Study is made of the potassium content of tungsten Rod and its impact on the sag resistance of tungsten wire. The results show that with effective P content at （50～80）×10^-6, the tungsten wire has good sag resistance. The crystal morphology, microstrucmre and hydrogen - annealed formation process has distinct impact on the sag resistance.

The effect of the processing methods on the mechanical properties of tantalum sheets was investigated in this paper.The microstructure of tantalum was observed under metallograph （OM）. Also the texture of tantalum was tested by X - ray diffractometry.The results show that primary tandem rolling reduced the anisotropic properties of tantalum sheets and led to finer grain for tantalum sheets more effectively, provided tantalum with strong{ 111 } 〈 uvw〉 texture, the process is selected for the processing of tantalum plate for Ta electrolytic capacitor crust.

Based on the description of mine tailing formation and classification, analysis is made of the significance and problems to be considered in comprehensive utilization of tailing resource. Specific utilization approach is presented forward and emphasis is put on proper handling of relationship between the comprehensive control and environmental protection.

Description is made of the history and prcgress of resin - in - pulp（RIP）process development. In view of the complexity of low - grade and difficult molybdenite and characteristics of metallurgical process development, the future application and development tendency application of resin - in - pulp process for molybdenum metallurgy is prospected. The actual applications showed that the use of RIP process during leaching for treatment of nonstandard high - carbon molybdenite concentrates resulted in 〉 99 % adsorption and stripping rates of Mo in resin and the Mo recovery 92 % ～ 95 %.

The paper summarizes the latest development of acid process for treatment of scheelite concentrate. Analysis and comiparian is made between the acid process and alkali process. It points out that acid process is of great vitality for treat scheelite concentrate treatment. The up - to - date process flow-sheet is presented.

The development of cemented carbide industry in China is briefly reviewed in the paper.The current situations on the product structure, technology ＆ equipment, talents and science ＆ technology, management of cemented carbide industry of China are analyzed emphatically. At same time some problems existing in cemented carbide industry of China are pointed out. For this reason, scrne assumptions and suggestions on the future development of cemented carbide industry in China are presented.