A Levextrel resin containing 2-ethylhexyl phosphonic acid mono-（2-ethylhexyl） ester （P507） was prepared by suspension polymerization. The analytic results show that the resin contains 0. 944 mmol/g extractant. The behavior of P507 for In（ Ⅲ ） extraction from HCl systems was studied. The results show that P507 can effectively adsorb In（Ⅲ） at pill. 0-1.5. The adsorption capacity increases with the temperature increase,the adsorption is an endothermic reaction,and the isothermal adsorption curves conform to the Langmuir and Freundlich models.

Description is made of a novel method of measuring porosity of the agglomerates for Al-Si alloy preparation by electrothermal process. The influence of pressure, sintering conditions and material particle size on the agglomerate porosity was also investigated. The results show that the agglomerate porosity decreases with higher pressure and smaller particle size, but increases with higher sintering temperature and longer sintering time. Sintering conditions have greater influence on the agglomerate porosity than the pressure and the material particle size.

The crude Al-Si alloy produced by carbon electrothermal reduction should be free of iron impurity after dilution refining. and slow manganese d However,iron removal by directly adding manganese will result in manganese loss illusion. Study is made on the feasibility of Fe removal from crude Al-Si alloy by MnCl2 instead of single Mn. The results show that MnCl2 can react with Al to produce Mn. Therefore, MnCl2 can substitute Mn to remove iron impurity from Al-Si alloy.

The effects of raw materials on the formation of silicon oxide nanospheres by hydrothermal deposition were investigated using Si and SiO2 as the silicon sources. The results show that the mixture of Si and SiOe is the best raw material for preparing silicon oxide nanospheres by hydrothermal deposition, and thus the silicon oxide nanospheres with a small grain size and uniform size distribution can be obtained. Using Si alone as raw materials results in the formation of the spheric structure with a large grain size and wide size distribution. Even regular spheric structure cannot be obtained when the raw material is single SiO2. Therefore,SiO2 plays an important role in the formation of silicon oxide nanospheres.

Study is made on the influence of pressing density and sintering temperature on the electrical properties of a typical tantalum capacitor with 16 V/100 μF solid electrolyte using tantalum powder with a specific capacity of 30 000 μF ·V/g as the raw material. The results show that both the porosity and the specific capacity of Ta anode sheets decrease with the increase of pressing density. And the leakage current coefficient decreases down to a minimum of 4.5 × 10^-4 μA/（μF·V） at a pressing density of 5.5 g/cm^3. Furthermore,the increase of sintering temperature has resulted in less specific capacity, lower leakage current coefficient of Ta anode sheets and more product loss.

The present status of alkali autoclave process of tungsten minerals is described. A deep-processing technology of tungsten minerals for extracting tungsten was developed to optimize the process flowsheet of alkaline decomposition production. Upon taking some corresponding technical measures,the WO3 content in tungsten residue is only 1.0- 1.5%, and the overall recovery of tungsten minerals increases by 1-2 percentage points so that the tungsten resource is effectively utilized.

Three major influencing factors on charging stability during powder automatic compacting in cemented carbide production were discussed to provide reference for mixture compacting performance evaluation, press machine parameter or press technological parameter modification and the smooth realization of mass production.

In view of the importance of silver-based electrical contact material in electrical power system and electrical appliance industry, the progress in the research and application of the above material was summarized and discussed based on the literatures and research experience.

The mineral composition characterization of Ni-Mo ores is analyzed, the latest development of the treatment technology for Ni-Mo ores is reviewed, and the advantages and disadvantages are compared between hydrometallurgical process and pyrometallurgical process for Ni-Mo ores. It is pointed out that the hydrometallurgical process is superior in treating Ni-Mo ores over pyrometallurgical process. Some problems present in the existing metallurgical processes of Ni-Mo ores are also pointed out. Furthermore,the development trend of the treatment technology for Ni-Mo ores is prospected.