Kinetic energy efficiency of atomizing air,by C is the ratio of the effective energy required for atomization to the kinetic energy of the atomizing air.The present study analyzes the variation of C with the Reynolds ...Kinetic energy efficiency of atomizing air,by C is the ratio of the effective energy required for atomization to the kinetic energy of the atomizing air.The present study analyzes the variation of C with the Reynolds number of atomazing air stream,Ohnesorge number and air to liquid mass ratio. Atomization of non-Newtonian fluids with viscosity up to 4.4 Pa·s is carried out by using a specially designed prefilming airblast atomizer. Drop sizes are measured by using laser diffraction technique. For liquids with low viscosities,impingement of air stream on the liquid film dominates the atomization process and film thickness exercises only minor influence on C ; while for liquids with high viscosities,disintegration of liquid film is made by the impingement of air stream on the liquid film and the wavy movement of film,and C is higher for thinner liquid film in the same operation conditions.The shear force on the surface of liquid film formed by swirling atomizing air plays an important role in the atomization of film in the conditions of low air velocities and low liquid viscosities and its influence on atomization gradually weakens with increasing atomizing air velocity and liquid viscosity.Eventually impinging on the liquid film dominates the atomization process.展开更多
Cathode material of spent lithium-ion batteries was refined to obtain high value-added cobalt and lithium products based on the chemical behaviors of metal in different oxidation states. The active substances separate...Cathode material of spent lithium-ion batteries was refined to obtain high value-added cobalt and lithium products based on the chemical behaviors of metal in different oxidation states. The active substances separated from the cathode of spent lithium-ion batteries were dissolved in H2SO4 and H2O2 solution, and precipitated as CoC2O4·2H2O microparticles by addition of （NH4）2C2O4. After collection of the CoC2O4·2H2O product by filtration, the Li2CO3 precipitates were obtained by addition of Na2CO3 in the left filtrate. The experimental study shows that 96.3% of Co （mass fraction） and 87.5% of Li can be dissolved in the solution of 2 mol/L H2SO4 and 2.0% H2O2 （volume fraction）, and 94.7% of Co and 71.0% of Li can be recovered respectively in the form of CoC2O4·2H2O and Li2CO3.展开更多
文摘Kinetic energy efficiency of atomizing air,by C is the ratio of the effective energy required for atomization to the kinetic energy of the atomizing air.The present study analyzes the variation of C with the Reynolds number of atomazing air stream,Ohnesorge number and air to liquid mass ratio. Atomization of non-Newtonian fluids with viscosity up to 4.4 Pa·s is carried out by using a specially designed prefilming airblast atomizer. Drop sizes are measured by using laser diffraction technique. For liquids with low viscosities,impingement of air stream on the liquid film dominates the atomization process and film thickness exercises only minor influence on C ; while for liquids with high viscosities,disintegration of liquid film is made by the impingement of air stream on the liquid film and the wavy movement of film,and C is higher for thinner liquid film in the same operation conditions.The shear force on the surface of liquid film formed by swirling atomizing air plays an important role in the atomization of film in the conditions of low air velocities and low liquid viscosities and its influence on atomization gradually weakens with increasing atomizing air velocity and liquid viscosity.Eventually impinging on the liquid film dominates the atomization process.
基金Project (51078286) supported by the National Natural Science Foundation of ChinaProject (2008BAC46B02) supported by the National Key Technologies R&D Program of China+1 种基金Project (2011SQRL110) supported by the Excellent Youth Foundation of Anhui Education Department, ChinaProject (KJ2011z053) supported by the Natural Science Foundation of Anhui Education Department, China
文摘Cathode material of spent lithium-ion batteries was refined to obtain high value-added cobalt and lithium products based on the chemical behaviors of metal in different oxidation states. The active substances separated from the cathode of spent lithium-ion batteries were dissolved in H2SO4 and H2O2 solution, and precipitated as CoC2O4·2H2O microparticles by addition of （NH4）2C2O4. After collection of the CoC2O4·2H2O product by filtration, the Li2CO3 precipitates were obtained by addition of Na2CO3 in the left filtrate. The experimental study shows that 96.3% of Co （mass fraction） and 87.5% of Li can be dissolved in the solution of 2 mol/L H2SO4 and 2.0% H2O2 （volume fraction）, and 94.7% of Co and 71.0% of Li can be recovered respectively in the form of CoC2O4·2H2O and Li2CO3.
