Ag-based alloys containing 3% CeO2 or γ-Al2O3 were prepared by powder metallurgy. The microstructure of the Ag-based alloys is studied by X-ray diffraction and metallographic analysis,and the hardness,electrical conductivity, density and friction factor were also tested. The results show that both the two alloys have a relative density of more than 98%. Compared with pure silver metal, the electrical conductivity of the two alloys greatly decreases, the grains are obviously refined, the hardness is improved, but the friction factors of Ag and Cu are not obviously lowered.

The silicothermic reaction of lithia in vacuum is analyzed from thermodynamics,and its minimum temperature and the corresponding dew point temperature under different conditions are calculated. The results show that the reaction temperature and the corresponding clew-point temperature should be over 900 ℃ and 606 ℃ respectively to obtain the liquid-condensed lithium by silicothermic reduction of lithia. The verification test was carried out in a vacuum silicothermic reducing furnace to obtain the condensed lithium metal.

The process flowsheet of Nd2O3 recovery from the scrap of sintered NdFeB magnet is studied. Based on the chemical properties of the elements in the scrap, Na2SO4 double-salt precipitation and oxalate secondary precipitation were employed in Nd2O3 recovery respectively. Both the impurity content and recovery rate are compared between the different recovery methods to obtain simple and feasible process conditions of high benefit. The test results show that rare earth elements are precipitated more completely by Na2SO4 double-salt precipitation, the product also has a higher purity and the Nd2O3 recovery is more than 82%.

The effects of chemical short-range order on the glass forming ability of Al-Zn-Ce alloy are studied by X-ray diffraction （XRD） and different scanning calorimetry （DSC）. The results show that Ce addition can promote the interatomic chemical combination of Al-Zn-based alloy to improve the formation probability of compounds and stop phase separation. The prepeak in XRD patterns indicates that strong chemical short-range order exists in Al-Zn-Ce alloy, as can improve the glass forming ability of Al-Zn-Ce alloy.

The influences of briquetting pressure, dry powder adhesive dosage,water distribution and tailing grain size on the compressive strength of green-pellet agglomerates are investigated by single-factor experiments. Furthermore, the compressive strength and resistivity of the sintered agglomerates is also studied. The results show that when briquetting pressure is 22.5 MPa, the dosage of dry powder adhesive 9% ,water distribution 12% and tailing grain size 0. 124-0. 097mm,the green-pellet agglomerates have a better compressive strength. With a higher roasting temperature and longer heat-preservation time, the compressive strength and resistivity of the agglomerates decrease to the gradually smaller extent.

The fresh solution from the previous purification process of zinc hydrometallurgy in Danxia Smelting Plant contains a relatively high content of impurity cobalt ions, so it cannot meet the requirement for the cobalt content for the electrolysis process after zinc pressure leaching. Therefore,the cobalt ion content in the purified solution from the new process is simulated. The effects of dosage of the zinc powder,copper sulfate and antimony white on the cobalt removal are investigated by orthogonal tests. The results show that when the consumption of zinc powder, copper sulfate and antimony white is 2 g/L, 5 mg/L and 2.5 mg/L respectively,the S/N ratio of the cobalt removal is optimal and the cobalt redissolving ratio is also minimum.

本公司是集粉末冶金设备开发、设计、制造、经营为一体的高科技企业。公司拥有各类专家和工程技术人员30多人，专门为粉末冶金生产线设计、制造、销售粉末还原设备、混合料设备、挤压成形、真空烧结等系列设备。公司是目前国内可以制造粉末冶金整条生产线（特别是硬质合金生产线）全套高精设备的企业之一。

The process of producing sheet V2O5 from vanadium slag during steel making is designed. Description is made of the process flowsheet, main equipment and technical economic index as well as the measures for energy saving and ＂Three Wastes＂ treatment.

Molybdenum removal from Na2WO4 solution by MoSa precipitation is studied, the influence of sulfidation and acid adjustment on molybdenum removal is also investigated,and the process for molybdenum removal is improved on this basis. This improved process can dispose Na2WO4 solution containing 0.1-1.5 g/L Mo,having advantages of stable and fast removal of Mo and low tungsten loss. And the product of APT comes up to the APT-0 standard.

The structure, performance, working principle and technical parameters of the new micro-filtration device with sintered polyethylene （PE） membrane are introduced. The micro-filtration devices with sintered PE membrane and inorganic ceramic membrane are commercially applied respectively in the centralized purification treatment Of water-based grinding fluid for cemented carbide. With 40 m^3/h flow and 1μm precision,3-month continuous operation without flow loss is ensured for the micro-filtration device with sintered PE membrane by the simple process of ＂end filtration ＋ back-blowing/backwashing＂. Compared with the inorganic ceramic micro-filtration device, the micro-filtration device with sintered PE membrane is much more economical and environmentally-friendly, quite adaptable to the centralized purification of grinding fluid for cemented carbide.