Carbonaceous shale from Henan Province was leached with sulfuric acid after pretreated with microwave,and then impurity removal from the leaching solution was carried out.The results show that the leaching rate of vanadium is up to 85% and increases by nearly 15% when carbonaceous shale is heated with microwave for 20 min.The aluminum removing rate can reach 82.31% by adjusting the leaching solution pH to 2.0.The silicon removing rate can reach 84.55% by adding 1.2 times theoretical amount MgCl2 into the leaching solution.

A process to produce vanadium pentoxide is introduced from the vanadium ore with high carbon and silicon content,including the main process steps as follows：roasting,sulfuric acid leaching,extraction with P204＋TBP＋aviation fuel and vanadium precipitation with ammonia.And the technical conditions of the process steps were studied.The vanadium ore is roasted at 500 ℃ for 5 h,ground to a size less than 75 μm and then leached twice with sulfuric acid.As a result,the vanadium leaching rate is up to 96.83%.The V2O5 product with a purity of 98.52% can be obtained and the total vanadium recovery is above 93% after extraction with P204＋TBP＋aviation fuel and vanadium precipitation with ammonia.The process not only improves the vanadium recovery of the vanadium ore with high silicon and carbon content,but also ensures sustainable production,good economic returns and light environmental pollution.

Vanadium was extracted from carbonaceous shale by blank roasting-pressurized high temperature alkali leaching.The effects of calcine grain size,liquid to solid ratio,leaching time and temperature,and alkali dosage on vanadium leaching rate were investigated.The results show that when the process of blank roasting-pressurized high temperature alkali leaching is applied in treating with carbonaceous shale,the vanadium leaching rate is satisfactory under the conditions of 3% NaOH dosage,195 ℃ leaching temperature and 2 h leaching time.Compared with blank roasting-atmospheric alkali leaching,the applied process has the advantages of less alkali consumption,high vanadium leaching rate and so on.

Research is made on the process for preparation of lithium-ion battery-grade cobalt sulfate from crude cobalt hydroxide.And the process flowsheet is as follows：impurity removal by preferential dissolution with dilute sulfuric acid,reducing leaching,Fe,Mn and As removal by oxide precipitation,Ca and Mg removal by fluoride precipitation,deep purification and impurity removal by extraction with P204,Ni and Co separation and Na removal by extraction with P507.The electronic-grade cobalt sulfate suitable for producing lithium cobalt oxide has been obtained through the above process.

Ta2O5 powder was prepared by neutralization crystallization and calcination.The influences of the six factors in the process of neutralization crystallization on the Ta2O5 particle size were studied including the concentration of tantalum solution,the initial pH of tantalum solution,crystallization temperature,ammonia concentration,ammonia flow rate and stirring speed.The optimal experimental conditions are as follows：the concentration of tantalum solution is 95 g/L,the initial pH of tantalum solution 1.80,crystallization temperature 60 ℃,ammonia concentration 8.0 mol/L,ammonia flow velocity 1.0 mL/min,and stirring speed 40 r/min.Prepared under the above conditions,Ta2O5 powder has the largest average particle size of 1.80 μm and fully meets with the production requirement.

CaTi4（PO4）6 bioceramic membrane was directly prepared by micro-arc oxidation,and the effects of electrolyte concentration on the growth of micro-arc oxidized membrane were investigated.The results show that the weight of micro-arc oxidized membrane increases linearly with reaction time prolonged under the same electrolyte concentration.With electrolyte concentration increasing,membrane weight increases faster,membrane formation time shortens and breakdown voltage lowers,and Ca content of membrane surface increases while P content has little change.However,after the electrolyte concentration has increased to a certain extent,increasing electrolyte concentration will result in the decrease of Ca and P content on membrane surface.

LaSrCo composite oxide was synthesized by hydrothermal process at 180 ℃ for 24 h,using lan-thanum nitrate,strontium nitrate and cobalt nitrate as the metal starting materials and citrate as the complexing agent. XRD patterns show that the product is composed of the La0.8Sr0.2CoO3-δ phase with orthorhombic hexahedral perovskite structure. SEM images show that the product is composed of 0.5 ~ 1um pherical particles. And infrared absorption spectra demonstrate that the product is composed of the main Lao.sSro.2CoO^-e component and a little residual citrate acid and adsorbed water. There are two small absorption peaks at 326 nm and 385 nm in ultraviolet absorption spectra of the product, which may be caused by the grain-boundary defects of La0.8Sr0.2CoO3-δ phase.

The Mo-La2O3 slab was prepared by liquid-liquid doping and powder metallurgy,and then rolled into plate.After annealing at different temperature,the tensile strength of the Mo-La2O3 plate was tested at room temperature.The fracture surface of the Mo-La2O3 plate and its La2O3 content and distribution were analyzed by SEM and EDS.The results show that the elongation of the Mo-La2O3 plate is higher than pure molybdenum plate.The room temperature tensile strength of the Mo-La2O3 plate increases significantly with the La2O3 content increasing.The dimple-shaped fracture changes into a cleavage-type one with annealing temperature rising.La2O3 is distributed in the grain or on grain boundary,which can greatly reduces the impurity content on grain boundary,inhibit the growth of microscopic holes and micropores,and then improve the strength and toughness of molybdenum plate.

The effects of double aging on mechanical properties and corrosion resistance of the Al-Cu-Li-Zr alloy containing Sc were studied by tensile test at room temperature,TEM and corrosion experiment.The results show that the alloy treated with double aging can show optimal comprehensive properties of strength and plasticity.Compared with the alloy treated with T8 peak aging,that with double aging has improved elongation even without its strength reduced.The main precipitated strengthening phase of the alloy is T1 phase.After double aging,fine and dispersive T1 phase precipitates in the grain interior,distributed uniformly in the alloy to improve its corrosion resistance.

The ITO powders were prepared by chemical precipitation and then used to prepare the ITO target material by spraying drying-cold isostatic pressing-sintering.The surface morphology and pore distribution of powder,bisque body and sintered ITO target material were examined by SEM.The influences of different powder particle size distribution on pressing and sintering of the target material were discussed.The results indicate that the ITO target material with a relative density over 97% can be obtained by spraying drying-cold isostatic pressing-sintering.Spraying drying can effectively enhance the fluidity and pressing performance of powder,and the bisque body mainly composed of small particles shows a higher sintering density.