Ag nanoparitcles were prepared via Ultrasound-assisted Membrane Reaction(UAMR)method.The key issue of the method is to control precisely the injection speed of the reactants by pulseless pump to make the nanoparticles...Ag nanoparitcles were prepared via Ultrasound-assisted Membrane Reaction(UAMR)method.The key issue of the method is to control precisely the injection speed of the reactants by pulseless pump to make the nanoparticles of Ag with small size and narrow size distribution.The size and morphology of silver nanoparticles were characterized with Transmission Electron Microscope(TEM)and UV-Vis spectrum.The experiment results show that the size of Ag nanoparticles prepared via UAMR method was smaller than that via Ultrasound-assisted Dropping Reaction(UADR)method.The size of 80% Ag nanoparticles prepared via UAMR was ranged from 3 nm to 5 nm with the mean particle size 4.7 nm and considerable narrow size distribution.The Ag hydrosol fabricated via UAMR method was very stable at room temperature,even within three months.展开更多
For studying the carbon thermal reduction rules of titanium in hot metal and providing a theoretical basis for the blast furnace（BF） hearth protection, the distribution behavior of titanium between low-titanium slag...For studying the carbon thermal reduction rules of titanium in hot metal and providing a theoretical basis for the blast furnace（BF） hearth protection, the distribution behavior of titanium between low-titanium slag system of CaO-SiO2-MgO-Al2O3-TiO2 and hot metal was studied using analytical reagents in a temperature range from 1350 °C to 1600 °C. Through high temperature melting, rapid quenching, chemical analysis and thermodynamic model calculating, the results showed that the increase of reaction temperature, which improved the titanium distribution L（Ti） and lowered the system activity coefficient γsys, leads to the rise of equilibrium constant. Combined with Wagner and congregated electron phase models, the data obtained in distribution experiments were used to fit out the Gibbs free energy formula of titanium carbothermic reduction. Finally, the relations between the contents of Si and Ti in hot metal and the titanium load to reach the minimum w（Ti） for the formation of Ti C were given.展开更多
基金supported by the China Postdoctoral Science Foundation(No.2021M690370)the State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,China(No.2020P4FZG06A)。
文摘Ag nanoparitcles were prepared via Ultrasound-assisted Membrane Reaction(UAMR)method.The key issue of the method is to control precisely the injection speed of the reactants by pulseless pump to make the nanoparticles of Ag with small size and narrow size distribution.The size and morphology of silver nanoparticles were characterized with Transmission Electron Microscope(TEM)and UV-Vis spectrum.The experiment results show that the size of Ag nanoparticles prepared via UAMR method was smaller than that via Ultrasound-assisted Dropping Reaction(UADR)method.The size of 80% Ag nanoparticles prepared via UAMR was ranged from 3 nm to 5 nm with the mean particle size 4.7 nm and considerable narrow size distribution.The Ag hydrosol fabricated via UAMR method was very stable at room temperature,even within three months.
基金Project(2012CB720401)supported by the National Basic Research Program of ChinaProject(2011BAC01B02)supported by the National Key Technology R&D Program of China
文摘For studying the carbon thermal reduction rules of titanium in hot metal and providing a theoretical basis for the blast furnace（BF） hearth protection, the distribution behavior of titanium between low-titanium slag system of CaO-SiO2-MgO-Al2O3-TiO2 and hot metal was studied using analytical reagents in a temperature range from 1350 °C to 1600 °C. Through high temperature melting, rapid quenching, chemical analysis and thermodynamic model calculating, the results showed that the increase of reaction temperature, which improved the titanium distribution L（Ti） and lowered the system activity coefficient γsys, leads to the rise of equilibrium constant. Combined with Wagner and congregated electron phase models, the data obtained in distribution experiments were used to fit out the Gibbs free energy formula of titanium carbothermic reduction. Finally, the relations between the contents of Si and Ti in hot metal and the titanium load to reach the minimum w（Ti） for the formation of Ti C were given.
