Study is made on the process and equipment of continuous distillation and concentration of high acid RE strip liquor. The results show that the use of the patented porous micro circulation, double effect continuous evaporator (made of quartz and with electric tube internal heating function) allows not only for continuous distillation and concentration of RE strip liquor, but also HCl recovery. The said equipment features good technical coordination of the high acid RE strip liquor in RE grouping and separation,lower cost and higher recovery without environmental pollution.

The density of NdF 3 LiF melts was measured by Archimedes method in the present paper.The regression equation of the density dependence on the concentration of NdF 3 and temperature was gained by means of two factor quadratic regression orthogonal design.And the effects of the concentration of NdF 3 and temperature on the density of the melts were discussed.Moreover,the influences of the addition of Nd 2O 3 on the density were investigated.

The effects of bonding phase composed of Ni and Cu on the properties of the liquid phase sintered Mo W Ni Cu alloy were studied. The results show that the sintering temperature decreases and the alloy grain is spheroidized and is refined with the increase of Ni and Cu or the ratio of Ni to Cu.Under the condition of a given ratio of Ni to Cu, the ultimate tensile strength of the alloy increases rapidly and then decreases slow with the increase of Ni and Cu. Under the condition of a given amount of Ni and Cu, the ultimate tensile strength changes with the increase in the ratio of Ni to Cu also so.When the ratio of Ni to Cu is 2.4, the amount of Ni and Cu is 6%wt, sintering temperature is above 1 380 ℃ , in the liquid phase sintered Mo based alloy there are few poles, the ultimate tensile strength can reach 1 100 MPa, the grain is cobble stone form.

对制备高松装密度氧化铌工艺进行了研究。结果表明 :采用我厂未经任何特殊处理的普通萃取泥液所制的Nb(OH) 5或Nb2 O5为原料 ,通过整形、高温凝聚和筛分等工艺过程 ,制出的氧化铌的松装密度可达 1 1g/cm3以上。

The principle and application of high temperature oxidation of metal and the composition design of hot rollring cemented carbide have been introduced.It has also been indicated that the rolling performance of cemented carbide can be improved with rare earth addition.

Analysis is made of Li 2O loss distribution and the reasons of metal recovery reduction. Some improvement methods are given.

The valence electron structure of TiC 1-x N x solid solution is analyzed according to solid and molecule empirical theory.The result shows that the covalence electron number n A in the strongest bond and the hardness in solid solution decrease with the increase of x due to the decrease of n A. It is verified in electron structure level that the stability can be enhanced when partial nitrogen atoms are replaced by carbon atoms in TiN.

Description is made of the experiences in analyzing and using scientific information for the purpose of importing advanced foreign technologies and know how and for promoting scientific research. Special emphasis was made on some high tech information,especially from Russia,which may be very useful for metallurgical industry and materials science,as well as for environmental protection.

The characteristics and preparation methods of superfine powder are introduced briefly.The present development and nature of the low heat solid phase chemical reaction is also discussed.The emphasis is put on the important role and new development of mechanic chemistry and low heat solid-phase reaction in the synthesis of superfine powder.The key points of research work in future are predicted.

In this article ,the main production methods, the friction properties and the ultra low friction mechanism of boron carbide materials are briefly introduced,The ways to get ultralow friction coefficient are presented,and the exising problems and the forecasting of future is also pointed out.