Study is made on the effects of the process of sulfur gravity separation-coal flotation-vanadium flotation on the processing of the vanadium-containing carbonaceous shale from a mine in Hunan province.The results show that with the grinding fineness of -0.074mm 90%,the coal concentrate with 20.61% fixed carbon,0.57% vanadium（i.e.,V2O5 grade of 1.02%）and 2.57% sulfur can be obtained from the vanadium-containing carbonaceous shale through sulfur gravity separation and one-stage roughing and twostage scavenging flotation,and its calorific value is 2.57 times that of the raw ore.The vanadium concentrate with 0.62% vanadium（i.e.,V2O5 grade of 1.11%）can be obtained by flotation from coal floatation tailing.The fixed carbon and vanadium in the vanadium-containing carbonaceous shale can be enriched in a certain degree through sulfur removal-coal flotation-vanadium flotation,but the two enrichment ratios are relatively low,indicating that the ore is refractory.

Based on the disadvantages of existing germanium extractants,germanium extraction in high-concentration sulfuric acid medium with HBL101was tested.The effects of feed acidity,extractant concentration,time,phase ratio and temperature on the extraction and stripping of germanium were investigated.The extraction and stripping isotherms were plotted.The results show that with 15%（volume fraction）HBL101 and sulphonated kerosene as extractant,the extraction rate of germanium reaches 98.32% in four-stage counter current extraction with O/A ratio of 1∶1 under the optimum conditions.The germanium in loaded organic phase can be stripped using 150g/L NaOH solution and the stripping rate is above 98% in six-stage counter current stripping with O/A ratio of 8∶1.

In view of Sb valence,the extraction performance difference of 2-octanol for Sb（Ⅲ）and Sb（Ⅴ）was studied.It is verified that Sb（Ⅴ）extraction is easier with 2-octanol under the same extraction conditions.Based on the above results,Sb in Ta-Nb ore decomposition solution was reduced with a certain amount of magnesium powder,resulting in transformation of high valence state of Sb into low valence state of Sb and Sb separation from Ta and Nb.The experimental results show that to control Sb content within20×10^-6 in the product of niobium pentoxide,reduction conditions should be 10g/L magnesium powder dosage and 5hreaction duration.

The mechanism was discussed of acid separation from Se-extracted waste liquor of Ni-Mo ore smelter dust with anion exchange membrane.Static diffusion dialysis tests were carried out,and the average diffusion velocity was investigated of H^＋ and Na^＋ with the selected 1^# or 3^# anion exchange membrane.Acid to salt separation coefficient of 1^# and 3^# anion exchange membrane was calculated,and then the type was determined of the anion exchange membrane suitable for acid separation from Se-extracted waste liquor.Meanwhile,the change law was studied of H^＋concentration with time in diffusion chamber and dialysis chamber during diffusion dialysis.

ANSY10.0 software was used to simulate the temperature field and electric field of 20kA electrolytic cell with bottom-liquid cathode,and based on the calculation results,the enclosed electrolytic cell with polar distance of 10cm and radius of 92cm was designed.The anode weight can be reduced by segmenting anode without electric field disturbance,and the residual anode consumption can be decreasing by the fixing way of assembling steel claw and graphite.The designed cell cover can improve current efficiency and reduce energy consumption,and the designed N2 inlet can prevent graphite consumption at anode sides attributed to oxidation.

The latest development of the pressure leaching technology for low-grade molybdenum ores and molybdenum secondary resources is reviewed.The chemical principles and process features are highlighted of the Ni-Mo ore treatment methods of oxidation water leaching with pressure,oxidation acid leaching with pressure and oxidation alkaline leaching with pressure.Besides,the future research orientation is proposed.

The clavate ZrO2 nano-powders were synthesized by hydrothermal process with ZrOCl2·8H2O as the zirconium source.The phase structure and morphology of the prepared samples were analyzed by XRD,FT-IR,EDS and SEM,and their light absorptivity was characterized by UV-Vis absorption spectra.The results show that the prepared samples are clavate ZrO2 nano-powders in the form of tetragonal phase and monoclinic phase,and they show good absorption performance to the ultraviolet light with the wavelength of 200～370nm.

The（In1-xFex）2O3 powders were prepared by solid phase synthesis with In2O3 and Fe2O3 as raw materials,and the influences were investigated of Fe doping concentration and roasting temperature on the structure and infrared properties of（In1-xFex）2O3 powders.The results show that under the conditions of Fe doping concentration x=0.05 and roasting temperature 900℃,Fe element can well dissolve into In2O3 lattice to form solid solution.With the increase of Fe doping concentration,the grain size of（In1-xFex）2O3 powders decreases at first and then increases,while the lattice structure of In2O3 is almost unchanged keeping bixbyite structure in cubic system.In addition,the（In1-xFex）2O3 powders doped with Fe show a good absorption performance to the infrared light of 400～4 000cm^-1.

Surface treatment of 0Cr18Ni9Ti stainless steel was carried out successively by Zr infiltration,C infiltration,pre-oxidation and so on.After different stages of processing,the high temperature oxidation behavior was investigated of the samples in air at 1 000～1 150℃.The results indicate that the relationship between unit area oxidation weight gain and oxidation time basically obeys parabolic law for all the samples,and their oxidization rate constant increases with temperature elevation.Treated with Zr infiltration,C infiltration or pre-oxidation,the samples have higher oxidative activation energy and slower isothermal oxidization rate,i.e.,their high temperature oxidation resistance is enhanced.

Ni-Cr-Mo-W high-temperature alloys were prepared by vacuum powder metallurgy sintering technique.The oxidation behavior of Ni-Cr-Mo-W alloys and the microstructure and phase composition of oxidation films were investigated.The results show that Ni-Cr-Mo-W alloys belong to perfect oxidation resistance level when they are oxidized at 900℃ for 100h.The main crystalline phases of surface oxide layer are Cr2O3 and NiCr2O4（spinel structure）,and the high-temperature oxidation resistance of Ni-Cr-Mo-W alloys can be improved by doping a certain amount of the refractory element W.