This study investigated the effect of ceramic ball diameter on grinding performance of quartz crystal with different particle sizes in wet ball mill,and established a population-equilibrium model in quartz grinding pr...This study investigated the effect of ceramic ball diameter on grinding performance of quartz crystal with different particle sizes in wet ball mill,and established a population-equilibrium model in quartz grinding process.The results show that the first-order crushing kinetic model can accurately describe the grinding behavior of quartz.The crushing rate of quartz mineral decreases with the decrease of the size of ceramic ball,but the crushing rate of small-size ceramic ball is less affected by the quartz feed size.On the other hand,quartz grinding products have obvious zero-order fine grain output characteristics in a short time,and with the decrease of ceramic ball diameter,the maximum grinding capacity of minerals increases first and then decreases.The grain size distribution of quartz grinding results can be calculated accurately by using the final quartz crushing parameters.The particle size distribution data simulated by the population balance model is in good agreement with the experimental data of quartz grinding process.展开更多
Ultra-large zirconia toughened alumina (ZTA,mass ratio of Al2O3 and ZrO2 is 78∶22) ceramics with eccentric circle shape were successfully sintered by microwave sintering with a multi-mode cavity at 2.45 GHz.The dimen...Ultra-large zirconia toughened alumina (ZTA,mass ratio of Al2O3 and ZrO2 is 78∶22) ceramics with eccentric circle shape were successfully sintered by microwave sintering with a multi-mode cavity at 2.45 GHz.The dimension of ZTA ceramics (green body) is 165 mm (outer diameter) × 25 mm (thickness).The optimized sintering temperature of microwave sintering is about 1500 ℃ for 30 min,and the total sintering time is about 4 h which is much shorter than that of conventional sintering.An auxiliary-heating insulation device was designed based on the principle of local caloric compensation to guarantee the intact sintered samples.With the increasing of sintering temperature,more and more microwave energy is absorbed within the entire sample,volumetric densification performs,and phases shift from m-ZrO2 phase to t-ZrO2 phase and cause Al2O3 grain growth.展开更多
基金support from the Key Basic Research Project of Yichun City(grant No.2023ZDJCYJ08)the Jiangxi Province Early Career Young Science and Technology Talent Training Project(grant No.20244BCE52190)the High-level Talents Start-up Project of Jiangxi University of Science and Technology(grant No.205200100701).
文摘This study investigated the effect of ceramic ball diameter on grinding performance of quartz crystal with different particle sizes in wet ball mill,and established a population-equilibrium model in quartz grinding process.The results show that the first-order crushing kinetic model can accurately describe the grinding behavior of quartz.The crushing rate of quartz mineral decreases with the decrease of the size of ceramic ball,but the crushing rate of small-size ceramic ball is less affected by the quartz feed size.On the other hand,quartz grinding products have obvious zero-order fine grain output characteristics in a short time,and with the decrease of ceramic ball diameter,the maximum grinding capacity of minerals increases first and then decreases.The grain size distribution of quartz grinding results can be calculated accurately by using the final quartz crushing parameters.The particle size distribution data simulated by the population balance model is in good agreement with the experimental data of quartz grinding process.
基金This work was sponsored by the National Natural Science Foundation of China
文摘Ultra-large zirconia toughened alumina (ZTA,mass ratio of Al2O3 and ZrO2 is 78∶22) ceramics with eccentric circle shape were successfully sintered by microwave sintering with a multi-mode cavity at 2.45 GHz.The dimension of ZTA ceramics (green body) is 165 mm (outer diameter) × 25 mm (thickness).The optimized sintering temperature of microwave sintering is about 1500 ℃ for 30 min,and the total sintering time is about 4 h which is much shorter than that of conventional sintering.An auxiliary-heating insulation device was designed based on the principle of local caloric compensation to guarantee the intact sintered samples.With the increasing of sintering temperature,more and more microwave energy is absorbed within the entire sample,volumetric densification performs,and phases shift from m-ZrO2 phase to t-ZrO2 phase and cause Al2O3 grain growth.
