Assuming that during the phase flow of PIM particle-binder,the powder particles are spherical with irregular size,the powder particles and gas molecule have similar physical and kinetic properties.Study is made on the particle phase motion during PIM two-phase flow based on the method similar to gas molecule kinectics.Comparison is made between the powder particle motion and gas molecule motion during PIM mould-filling.Based on Boltzmann equation,analysis is made of the physical and kinectic parameters of the powder particle,quality/moment/and energy conservation equation of the PIM particle-binder flow are established,providing a theoretical basis for digital simulation of the two-phase flow and analysis of two-phase separation.

Study is made of the treatment of acid effluent from ammonium molybdate plant by addition of ammonium sulfide and pH value control with ammonia spirit.Under proper condition,over 90% of heavy metals Cu,Pb,Zn,Fe in the effluent are precipitated and removed,>98% Mo coprecipitated into the residue.Then,the precipitation residue is dissolved by ammonia spirit with 84.59% Mo converted into ammonium molybdate solution,while Fe,Cu,Pb in the residue are basically insoluable,part of Zn going to ammornium molybdate solution ,which can go directly back to the main circuit of ammonium moybdate.The treated acid effluent is retreated for removal of alkali metal ion before crystalized to produce ammonium nitrate.

The mechanical alloying of both Ti-20%Cr and Ti-30% Cr alloys with titanium powder and chromium powder as raw materials is studied.The results show that with the increase of ball-milling time,Ti-Cr powder particle and grain become smaller and smaller,and layer structure is thiner and thiner,and the X-ray diffraction peaks of both titanium and chromium become broader and their intensity diminish.At the same time,it is found that the X-ray diffraction peaks of chromium have a tendency to move toward smaller angle.When ball-milling time reaches 100 hours,the amorphous character of mixing powder is revealed with stable particle size.

Lead zirconate titanate (PZT) thin films are prepared on the substrates of monocrystal Si,PLT/Si,PT/Si/and proton-exchanged(PE)LiNbO3 by sol-gel process.Interface diffusion and the effect of Pb content on the films crystallization were investigated.In all cases,excess Pb(CH3COO)2 was added to avoid the formation of pb-deficient pyrochlore.

The nanometer anatase TiO2 powder was prepared by hydrolysis and homogeneous precipitation.The most favorable operating conditions were also studied.The morphology,size,crystal shape and specific surface area of nanometer TiO2 powder waere characterized by TEM,XRM,BET and DTA-TG methods.The results show that the TiO2 particle appears spherical shape,the average particle diameter is 20nm,and the specific surface area is 90m2/g.The new technology is simple to operate with low cost and is easy to be industrialized.The obtained nanometer titanium dioxide powder can meet the needs of markets.

Non-uniform structured JZ06-brand alloy is developed.Compared with similar products,the developed alloy has come up to the domeslic advanced level in respect of its performance and service data with similar performance to that of some foreign alloys.

The process flowsheet for commercial beryllium oxide from high-F/high-Mg beryl concentrates is described in this paper.Problems and causes thereby as weu as improving measures and effects are also introduced.

Based on the sampling design for Ta/Nb ore dressing flowsheet and sampling operating practice,the paper investigated the problems and their solutions during the RE ore deposit samping design and sampling operation.

Analysis is made of the characteristics of cemented carbide industry in China.The paper describes the features of the technical innovation by the medium and small-size cemented carbide factories with emphasis stressed on coordination with the state innovation system in combination with market orientation.It is pointed out that the medium/small-size cemented carbide factories should base the innovation on anologue innovation,creating conditions for cooperative innovation.Description is also made of the major issues to be addressed.

The paper lntroduced research and application of solvent impregnated resin in extraction of scandiumAs a new kind of extractant,solvent impregnated resins can notably improve the capacity and the efficiency of scandium extraction,and is suitable in the ore pulp extraction that the general liquid extraction is hard to apply,indicating its unique good application prospect.