Study is made of removal of organic matter from industrial H_2TaF_7 solution by active carbon in order to reduce carbon content in K_2TaF_7 crystal.The test results showed that active carbon can reduce COD value in H_2TaF_7 solution,consequently reduce carbon content in K_2TaF_7 crystal from 0.002 5%～0.003 0% to 0.001.0 %～0.001 5%, and the percloration & absorption factor reached 70In addition,there is linear relationship between COD value in H_2TaF_7 solution and carbon content in K_2TaF_7 crystal,the carbon content in K_2TaF_7 crystal decreases with the decreasing of COD value in H_2TaF_7 solution.When COD value is lower than 8 mg/L,carbon content in K_2TaF_7 crystal would be reduced down to less than 0.001 5%.

Study is made of the effects and effecting mechanisms of a new type of grain growth inhibitor on vacuum sintering behavior of nanometer cemented carbide.The results show that the new grain-growth inhibitor can improve sintering densification process.The addition of the new grain-growth inhibitor into traditional transitional element carbides,resulteding composite inhibitors,which are much more effective and can induce oriented WC grain growth obviously during sintering.For WC-10Co-0.8VC/Cr_3C_2 powders with 0.1% mass content of the new additive,the density of 14.48 g/cm^3 can be achieved after sintering at 1 375 ℃ for 30 min, corresponding to the grain size of 160 nm and the micro-hardness of 2 150 MPa.

Study and analysis is made of the transformation of the microstructure and the hardness of WC/steel composite material under different heat-treatment conditions.And effect of the heat-treatment temperature on high-temperature wearing character is also investigated.The results showed WC/steel composites material has good high-temperature wearing character when quenching at 1 050 ℃ and tempering at 480 ℃ and 640 ℃.

Test is made on olivine LiFePO_4 anode material for lithium-ion battery.LiFePO_4 and carbon-doped LiFePO_4 were prepared by solid-phase synthesization. Test results showed that carbon-doped LiFePO_4 had good electrochemical performance.Discharging at 0.1 C rate,the initial discharge capacity was 130 mA·h/g with little capacity decrease after 10 circles at room temperature.

ATO nanometer powder was prepared respectively by ultrasonic hydrolysis and conventional electromagnetic agitation hydrolysis.The powder was tested with XRD,SEM,TEM and the resistivity of powder was measured.Comparison is made between the aggregation factor of the nanometer powders prepared by the said two methods and the mechanism of agglomerate phenomena was discussed.The results showed that ultrasonic can inhibit the aggregation of ATO nanometer powder prepared by alkoxide hydrolysis,whose resistivity is slightly higher than that prepared by conventional electromagnetic agitation hydrolysis.

Indium tin oxide (ITO) conductive and transparent film is prepared on quartz glass matrix from In(NO_3) and acetylacetone by sol-gel dip-coating technique with anhydrous SnCl_4 as the dopant.The phase transformation process,the surface structure,the microscopic morphology and physical properties of the film were measured and analyzed by XRD,SED,IR,4-probe method and UV-VIS spectrometer.The experimental results showed that it is absolutely feasible to fabricate ITO film on the quartz matrix by sol-gel technique,and the ITO film has the micro-structure accumulated by several particles and ITO film has the cubic bixbyite crystal structure,and[111] is its preferred orientation.The thickness of ITO film was below 150nm upon five times dip-coating ,the square-wave resistance of the film is about 110 Ω with resistivity about 1.65×10^-2 Ω·cm and>90% transmittancy.

Experiment is done on the acid hydrolysis of titanium-columbite-tantalite ore difficult to decompose.Based on the existing tantalum and niobium acid hydrolysis, the decomposition rate of Ta_2O_5 and Nb_2O_5 is increased from (72.3)% and 73.6% up to>97% with satisfactory results with smaller powder particle size,more acid consumption and longer heat insulation time,etc.

Commercial-scale test is made on Ti slag smelting from Panzhihua Ti ore and Yunnan Ti ore with open-top electric furnace.The results showed that slag and iron are effectively separated and qualified Ti slag is obtained with Ti assaying respectively 79%, 82% and 74% from mixed ore,Yunnan Ti ore and Panzhihua Ti ore.Analysis is made of the feature and parameters of Ti slag smelting with open-top electric furnace.

In the paper is reviewed the study of strength and structure of WC-Co hard alloyIt indicated that WC-Co hard alloy is characteristic of particle compound reinforcing material,based on which investigationis are made into the mi crostructure and preparation technology of the said alloy.

Brief description is made of the development and application of several processes for improvement of W ion-exchange technology by Ganzhou Huaxing Tungsten Products Company Ltd,including the new process of scheelite alkali decomposition,slurry alkali recovery,ion-exchange series-column absorption,Mo removal process,APT crystal parent solution recovery,ammonia recovery from evaporated crystal off-gas.The application of the said new technologies or measures has resulted in operating cost reduction by RMB$1000/t APT.Some suggestions are put forward for future technical development.