The density of zinc powder for alkaline battery was determined using a pyknometer.The results showed that powders made before the end of 2003 could reach relative densities above 99% of the theoretical density.Investi...The density of zinc powder for alkaline battery was determined using a pyknometer.The results showed that powders made before the end of 2003 could reach relative densities above 99% of the theoretical density.Investigating the relative volume swelling of electrolysed gels of zinc powders,no evident relation between swelling and pyknometer density was found.展开更多
Zinc powder electrodeposited from suspension bath has higher corrosion resistance than that from conventional bath. The results of X ray, SEM and EIS (Electrochem. Impedance Spectrum) indicated that the microstructur...Zinc powder electrodeposited from suspension bath has higher corrosion resistance than that from conventional bath. The results of X ray, SEM and EIS (Electrochem. Impedance Spectrum) indicated that the microstructures of zinc powder could be modified according to the kinds of suspension species. Suspension of TiO 2, SiO 2, In 2O 3, PbO 2 and SnO 2 could obviously improve the polarization resistance of zinc powder anodes in 5 mol/L KOH solution.展开更多
This work focused on the zinc powder coated with Y(OH)3 microparticles by means of ultrasonic immersion for performance improvement of zinc electrodes in alkaline battery systems.Scanning electron microscopy and other...This work focused on the zinc powder coated with Y(OH)3 microparticles by means of ultrasonic immersion for performance improvement of zinc electrodes in alkaline battery systems.Scanning electron microscopy and other characterization techniques were applied to examine the influence of the ultrasonic power on the sonochemical growth of Y(OH)3 microparticles in direct contact with zinc powder.Electrochemical properties of zinc electrodes containing Y(OH)3 microparticles were discussed through the measurement...展开更多
Zn-doped TiO_2 catalysts were prepared using a sol-gel method and characterized by XPS,UV-Vis,BET, XRD in this study.Under the irradiation of simulant sunlight,the photocatalytic activity for the degradation of p-nitr...Zn-doped TiO_2 catalysts were prepared using a sol-gel method and characterized by XPS,UV-Vis,BET, XRD in this study.Under the irradiation of simulant sunlight,the photocatalytic activity for the degradation of p-nitrophenol was studied too.After irradiation for 2.5 h,the degradation percentage of p-nitrophenol could rise to more than 80%.The results showed that the spectrum absorption band edge of Zn/TiO_2 powder does not broaden obviously comparing with pure TiO_2 powder.Zinc exists as Zn (Ⅱ).When calcined at 973 K,there is a new phase as ZnTiO_3 in Zn/TiO_2 catalyst.The order of photocatalytic activity of Zn/TiO_2 catalysts calcined at different temperatures for p-nitrophenol is 773 K＞673 K＞873 K＞573 K＞973 K and the photocatalytic activity of Zn/TiO_2 catalyst cal- cined at 773 K is better than TiO_2 catalysts heated at the same temperature,and outclasses that of commercial TiO_2 catalyst.It also showed that the photocatalytic degradation of p-nitrophenol follows first-order kinetics under the irra- diation of simulant sunlight.展开更多
A hydrometallurgical process for indium extraction and ferric oxide powder preparation for soft magnetic ferrite material was developed.Using reduction lixivium from high-acid reductive leaching of zinc oxide calcine ...A hydrometallurgical process for indium extraction and ferric oxide powder preparation for soft magnetic ferrite material was developed.Using reduction lixivium from high-acid reductive leaching of zinc oxide calcine as raw solution,copper and indium were firstly recovered by iron powder cementation and neutralization.The recovery ratios of Cu and In are 99% and 95%,respectively.Some harmful impurities that have negative influences on magnetic properties of soft magnetic ferrite material are deeply removed with sulfidization purification and neutral flocculation method.Under the optimum conditions,the content of impurities like Cu,Pb,As,Al in pure Zn-Fe sulfate solution are less than 0.004 g/L,but those of Cd,Si,Ca and Mg are relatively high.Finally,thermal precipitation of iron is carried out at 210 °C for 1.5 h.The precipitation ratio of Fe is 93.33%.Compared with the quality standard of ferric oxide for soft magnetic ferrite materials,the contents of Al and Mg in obtained ferric oxide powder meet the requirement of YHT1 level of ferric oxide,and those of Si,Ca meet the requirement of YHT3 level of ferric oxide.XRD and SEM characterizations confirm that the obtained sample is well-dispersed spindle spherule with regular α-Fe2O3 crystal structure.The length-to-diameter ratio of α-Fe2O3 powder is(3-4):1 with an average particle size of 0.5 μm.展开更多
文摘The density of zinc powder for alkaline battery was determined using a pyknometer.The results showed that powders made before the end of 2003 could reach relative densities above 99% of the theoretical density.Investigating the relative volume swelling of electrolysed gels of zinc powders,no evident relation between swelling and pyknometer density was found.
文摘Zinc powder electrodeposited from suspension bath has higher corrosion resistance than that from conventional bath. The results of X ray, SEM and EIS (Electrochem. Impedance Spectrum) indicated that the microstructures of zinc powder could be modified according to the kinds of suspension species. Suspension of TiO 2, SiO 2, In 2O 3, PbO 2 and SnO 2 could obviously improve the polarization resistance of zinc powder anodes in 5 mol/L KOH solution.
基金Project supported by the Science Foundation of Jiangsu Province of China （No. BK2004085） and the National Natural Science Foundation of China （No. 20372032）.
基金supported by the Innovation Foundation of BUAA for Ph. D Graduates Provided by Beihang University in China
文摘This work focused on the zinc powder coated with Y(OH)3 microparticles by means of ultrasonic immersion for performance improvement of zinc electrodes in alkaline battery systems.Scanning electron microscopy and other characterization techniques were applied to examine the influence of the ultrasonic power on the sonochemical growth of Y(OH)3 microparticles in direct contact with zinc powder.Electrochemical properties of zinc electrodes containing Y(OH)3 microparticles were discussed through the measurement...
文摘Zn-doped TiO_2 catalysts were prepared using a sol-gel method and characterized by XPS,UV-Vis,BET, XRD in this study.Under the irradiation of simulant sunlight,the photocatalytic activity for the degradation of p-nitrophenol was studied too.After irradiation for 2.5 h,the degradation percentage of p-nitrophenol could rise to more than 80%.The results showed that the spectrum absorption band edge of Zn/TiO_2 powder does not broaden obviously comparing with pure TiO_2 powder.Zinc exists as Zn (Ⅱ).When calcined at 973 K,there is a new phase as ZnTiO_3 in Zn/TiO_2 catalyst.The order of photocatalytic activity of Zn/TiO_2 catalysts calcined at different temperatures for p-nitrophenol is 773 K＞673 K＞873 K＞573 K＞973 K and the photocatalytic activity of Zn/TiO_2 catalyst cal- cined at 773 K is better than TiO_2 catalysts heated at the same temperature,and outclasses that of commercial TiO_2 catalyst.It also showed that the photocatalytic degradation of p-nitrophenol follows first-order kinetics under the irra- diation of simulant sunlight.
基金Project(50674104) supported by the National Natural Science Foundation of ChinaProject(2006BA02B04-4-2) supported by the Planned Science and Technology of China
文摘A hydrometallurgical process for indium extraction and ferric oxide powder preparation for soft magnetic ferrite material was developed.Using reduction lixivium from high-acid reductive leaching of zinc oxide calcine as raw solution,copper and indium were firstly recovered by iron powder cementation and neutralization.The recovery ratios of Cu and In are 99% and 95%,respectively.Some harmful impurities that have negative influences on magnetic properties of soft magnetic ferrite material are deeply removed with sulfidization purification and neutral flocculation method.Under the optimum conditions,the content of impurities like Cu,Pb,As,Al in pure Zn-Fe sulfate solution are less than 0.004 g/L,but those of Cd,Si,Ca and Mg are relatively high.Finally,thermal precipitation of iron is carried out at 210 °C for 1.5 h.The precipitation ratio of Fe is 93.33%.Compared with the quality standard of ferric oxide for soft magnetic ferrite materials,the contents of Al and Mg in obtained ferric oxide powder meet the requirement of YHT1 level of ferric oxide,and those of Si,Ca meet the requirement of YHT3 level of ferric oxide.XRD and SEM characterizations confirm that the obtained sample is well-dispersed spindle spherule with regular α-Fe2O3 crystal structure.The length-to-diameter ratio of α-Fe2O3 powder is(3-4):1 with an average particle size of 0.5 μm.
