In view of large amount of tellurium and bismuth enriched in bismuth refined alkaline residue,a process is proposed of tellurium and bismuth recovery from the alkaline residue.Tellurium exists in the alkaline residue mainly in the form of sodium tellurite.Sodium tellurite is soluble in water and transforms into tellurium dioxide near neutral pH value.Therefore,tellurium can be recovered to prepare coarse tellurium dioxide from the alkaline residue by primary process steps of water leaching,neutralization,roasting and so on.Feasibility of tellurium recovery from the alkaline residue was verified,and the influences were emphatically investigated of leaching time,liquid-solid ratio and neutralization pH value for tellurium precipitation on tellurium recovery.The results show that the optimum conditions are as follows：leaching time of5 h,liquid-solid ratio of 5∶1and neutralization pH value of 6.0for tellurium precipitation.

Introduction is made of Kaldor furnace process,semi-hydrometallurgical process and hydrometallurgical process widely applied for copper anode slime treatment at home and abroad.these processes are compared from process flowsheet,enrichment direction of main impurities and main existing problems,and then some suggestions are proposed on selection of copper anode slime treatment processes,and the future development direction is also pointed out.

ZrO2-doped tungsten alloy powders were prepared with step hydrothermal method combined with calcination and two-stage hydrogen reduction process using APT and zirconium nitrate as raw materials.Phase composition,morphology and phase transformation were analyzed of the products from different preparation process by XRD,EDS,SEM and TEM.The results show that a tungstenic acid of 1.5WO3·2H2O is generated in the hydrothermal reaction of APT and nitric acid,and monoclinic ZrO2 is generated in the hydrothermal reaction of zirconium nitrate and ammonia.The above products were uniformly mixed by liquid-liquid doping and dried to obtain the precursor powders.After calcination of the precursor powders at500-550 ℃,cubic 1.5WO3·2H2O transforms into monoclinic WO3.After 800 ℃×2h＋900 ℃×2hhydrogen reduction,ZrO2-doped tungsten alloy powders were obtained with average particle size of 10-20nm.Based on the results of contrast experiments,it is concluded that doping ZrO2 can play a role in refinement of tungsten grains.

Fe-Cr-C-Nb hardfacing alloy was prepared on the surface of 45 steel by open arc surfacing weding witn self-shielding flux-cored welding wires.The effect of ferroniobium content on microstructure,hardness and wear resistance of Fe-Cr-C-Nb hardfacing alloy was studied by using OM,SEM,XRD,Rockwell hardness tester and wear testing machine.The results show that the microstructure of Fe-Cr-C-Nb hardfacing alloy is composed ofγ-Fe、NbC、M7C3、M3C and a littleα-Fe.With the increase of Nb content,NbC precipitates have increased total amount and disperse uniformly in the matrix,with morphology evolution from granular to dendritic,and the growth ofγ-Fe particles is inhibited to refine the grains,and improve toughness and strength of Fe-Cr-C-Nb hardfacing alloy.The experimental results of hardness and wear resistance tests show that with the increase of Nb content,the hardness of Fe-Cr-C-Nb hardfacing alloy increases,and its wear resistance increases at first and then decreases.

In order to find the suitable annealing temperature of La0.62Y0.2Mg0.18Ni3.30Al0.20 alloy with excellence gaseous hydrogen absorption and desorption performance,phase composition and metallographic microstructure of the as-cast and annealed alloy were analyzed by XRD and OM,surface morphology of alloy particles before and after hydrogen absorption and desorption was observed by SEM,and PCT characteristics and dynamic performance of hydrogen absorption and desorption of the alloy were tested by pressurecomponent-temperature（PCT）apparatus.The results show that annealed alloy at 900℃contains the main phases of LaNi5and（La,Y,Mg）2（Ni,Al）7and Ni3 Y residual phase.With annealing temperature increasing,the main phases are unchanged but Ni3 Y phase is transformed into Y2Ni7 phase,and its cell volume increases at first and then decreases and FWHM firstly decreases and then increases within 41-43°diffraction angle.Compared with the as-cast alloy and the annealed alloy at 900℃,1 000℃and 1 050℃,the annealed alloy at 950 ℃ has better microstructure uniformity,and higher capacity and average velocity and smaller hydrogen pressure and hysteresis coefficient of hydrogen absorption and desorption.Based on comprehensive comparison,the suitable annealing temperature is 950 ℃for the alloy in our experiments.

TiC/Cu composite was prepared by powder metallurgy,the influence of different TiC content on microstructure and tensile properties of the composite was investigated,and its surface morphology and tensile fracture morphology were analyzed by scanning electron microscope and metallographic microscope.The results show that TiC particles is tightly bonded to the substrate and distributed evenly in the substrate.The tensile strength of the composite increases at first and then decreases with TiC content increasing.TiC addition remarkably hinders the growth of matrix grains.When TiC content is 2%,its reinforcement effect is obvious and the plasticity of the composite is high.

AlCrFeNiTi high entropy alloy was prepared by vacuum arc melting in argon atmosphere.The influences were investigated of heating temperature,holding time and cooling methods on microstructure and hardness of AlCrFeNiTi high entropy alloy with methods of X-ray diffraction,metalloscope and Vickers hardness tester.The results show that the as-cast AlCrFeNiTi high entropy alloy is composed of two kinds of solid solutions with different body centered cubic structure,forming typical high entropy alloy microstructure of dendrite,interdendrite,andα＋βeutectic.With the increase of heating temperature,the dendrite phase experiences a process of first coarsening and subsequent refinement at 900℃.As the holding time increases and cooling rate decreases,the microstructures of dendrite and interdendrite coarsen,but the hardness of alloy shows tendency to ascend.The hardness of alloy after heat treatment depends on the content and morphology of dendrite phase,and meanwhile the residual internal stress also play an important role in the hardness of the alloy cooled at high speed.

Some isothermal constant speed compression tests on TA15 titanium alloys were carried out by Gleeble-3500 thermal simulator,the dislocation evolution of TA15 titanium alloy during hot compression deformation was analyzed by materials analysis and testing techniques（XRD and TEM）and related quantitative calculation theory（XRD linear Fourier analysis method）.The results show that the primary dislocations consist of（1010）,（0002）,（1011）and（110）βtypes in deformed TA15 titanium alloy during hot compression deformation,and the dislocation density is in the range of 1013-10^14 cm^-2.When deformation temperature is 950 ℃ and deformation degree is 40%,the dislocation density of（1010）and（110）βtypes is almost unchanged with strain rate increasing.The dislocation density of all types decreases with strain rate increasing at deformation degree of 60%.When strain rate is 1s-1,the average lattice strain and dislocation density decrease with deformation degree increasing.The lattice strain drops to 0.116%-0.138%,and the dislocation density drops to（1.1-1.7）×10^14 cm^-2 at deformation degree of 60%.Microscopic deformation bands and dislocation cell are developed by dislocation in（α＋β）two-phase region.However,the dislocation density is very low in lath martensiteα＇phase to form dislocation pile group,and then highly concentrated stress is formed between dislocation pile group and martensiteα＇phase inβsingle-phase region.

Research progress is reviewed on synthesis of vanadium phosphorous oxide catalyzers with new preparation methods at home and abroad in recent years.The advantages and disadvantages of each method are summarized,and the prospect and direction of their development are forecasted.

The latest development of germinate luminescent materials is reviewed from the aspects of luminescent characteristics,red shift,quenching and near-infrared luminescence properties and mechanism to lay a basis for the further study of germanate luminescent materials.