Barium titanate powder was prepared by hydrothermal method, doped with Dy（Ac）3, and then the ceramic was obtained. The effects of soluble Dy（Ac）3 doping on the dielectric properties of BaTiO3 powder were studied, and the law of the influence on the BT series capacitor ceramics has been obtained, i. e. with the increasing of Dy（Ac）3 additive, the dielectric constant （εr） of materials starts increasing and then decreasing while the dielectric losses （tanS） decreasing and the dielectric constant （εr） is maximum while ωDy（Ac）3 =0. 8%. The BT ceramics with optimum comprehensive properties have been obtained with high εr （= 5 672） ,low tanS（ =0. 0024） and high DC breakdown voltage（=6 kV/mm）. The influence mechanism of Dy（Ac）3 on the dielectric properties of BaTiO3ceramics is studied,thus providing the basis for prepara- tion of capacitor ceramics.

Al-Sc intermediate alloy is prepared by alumino-thermic reduction. The test results showed that the addition of appropriate amount of ScF3 into nNaF · AlF3-KCl-NaCl molten salt can improve Sc2O3 solubility;the use of liquid A1 as reductant for the preparation of Al-Sc intermediate alloy can increase Sc content （assaying 2% mass）and Sc recovery as well as improve the quality of the intermediate alloy and reduce the operating cost,as can facilitate the further application of Al-Sc intermediate alloy.

Ta powder for military and astronautic industrial purpose is developed. The technological circuit of high-grade and energy-saved FTB-42 Ta powder is established through the technological study,improvement of the Na reduction and heat treatment process and commercial-scale test.

Sm and Gd co-doped CeO2 electrolyte powders were prepared by co-precipitation. The phase composition,morphology and particle size of the powders were characterized. At the same time, the properties of the sintered SGC materials were also characterized. The results showed that the SGC electrolyticpowder prepared by the co-precipitation had good sintering characteristic with relative density〉93% when sintering at 1 400℃. The electrical ：property testing also showed that the sintered SGC materials had the higher oxygen ion electrical conductivity at medium-temperature.

Based on the years of investigation and through comparison with conventional porous metallic ma terial,porous cemented carbide materialare developed. Its production process is presented.

The factors that affect the coercive force of cemented carbides are analyzed theoretically. Under high-temperate operation mode and actual operation mode,the coercive force is mainly relatedto the maximal sintering temperature. Research is carried out on the high temperature field of PVA sintering furnace. Data processing and analysis is done to obtain the quantitative relationship between coercive force and maximal sintering temperature.

The article discusses the distribution, enrichment and integrate recovery of In and Ge in Zn metallurgy with I. S. P or hot-acid-leaching process. It is pointed out that the use of pressure leaching of Zn concentrate can directly enrich sornemetal values such as Zn, In and Ge, during Zn extraction with large leaching rate and recovery.

The paper describes basic process flowsheet of HCl selective dissolution for the recovery of RE elements from NdFeB scrap. Extractive separation of Nd and Dy is done in the production line to obtain Dy203 （purity ≥99% mass） with RE impurity up to the Chinese national standard and RE overall recovery 〉92%. The said process is characterized by reliable technology, low industrial operation cost and quick economic return.

By depth filtration of suspended material in effluent after treatment using contact filtration process,the total Zn and Cd concentration in the effluent discharge can be dropped to 1.50 mg/L and 0.05 mg/L respectively and the availability of effluent after treatment can be improved from 10 % to 60 %. Effluent discharge coefficient is 7- 8 m^3 per ton of production. Effluent discharge can meet the environmental protection requirements of the government.

In the paper,arsenazo RE developer was reviewed, focusing on the coloring reaction system,max. absorption wave length/molar absorption factor/detection limit and the interference in corresponding photometric analysis as well as the relevant applications .