陶瓷干法造粒过程坯料颗粒成形与雾化液含量的影响

为研究陶瓷干法造粒制粉过程坯料颗粒成形与雾化液含量的关系,基于欧拉-欧拉双流体模型模拟干法造粒制粉过程坯料颗粒与雾化液混合过程,同时对坯料颗粒流动性、颗粒级配及粗糙度进行实验分析,验证数值模拟结果正确性.仿真结果表明:当雾化液含量分别为100 mL、200 mL、300 mL时,坯料颗粒在造粒室内的分散性无明显差异,团聚现象不明显;当雾化液含量分别为400 mL、500 mL时,坯料颗粒在造粒室内的分散性有明显变化,团聚现象显著.实验结果表明:当雾化液含量分别为100 mL、200 mL、300 mL、400 mL、500 mL时,坯料颗粒的流动性指数依次为63.5;、83.0;、90.0;、77.0;、61.0;,有效坯料颗粒百分比依次为72;、83;、90;、82;、65;,粗糙度系数平均值依次为1.38、1.43、1.26、1.49、1.57.综合分析说明:数值仿真与实验结果基本相吻合,造粒过程中雾化液含量为300 mL时,干法造粒制粉过程造粒室内坯料颗粒的分散性较好,且基本无团聚现象;坯料颗粒的流动性最佳、颗粒级配最均匀、粗糙度整体最优,即造粒效果最好.

Effect of Blank Particles Forming and Atomized Liquid Content on Dry Granulation Process

In order to study the relationship between the granule formation and the content of atomized liquid in dry granulation process.Based on Eulerian-Eulerian two-fluid model to simulated the mixing process of blank particles and atomized liquid in dry granulation process.The fluidity index, particle gradation and roughness of the blank particles were analyzed in experiment.Verified the correctness of numerical simulation results.Simulation results express when the atomized liquid content is 100 mL, 200 mL and 300 mL, there is no significant difference in the particles' dispersion in granulation chamber, agglomerate phenomenon is not obvious.When the atomized liquid content is 400 mL, 500 mL, there has significant difference in the particles' dispersion in granulation chamber.Agglomerate phenomenon is obvious.Experimental results show when the atomized liquid content is 100 mL, 200 mL, 300 mL, 400 mL and 500 mL.The fluidity index of the billet particles is 63.5%, 83.0%, 90.0%, 77.0%, 61.0%.Percentage of effective particles is 72%, 83%, 90%, 82%, 65%.Average roughness coefficient is 1.38, 1.43, 1.26, 1.49, 1.57.Comprehensive analysis show the result of numerical simulation is agreement with the experiment, when the atomized liquid content is 300 mL in granulation process, the particles' dispersion in granulation chamber is good and there has no agglomeration.The fluidity of particles is optimal, particle gradation is the most uniform, roughness is the optimal.Which means granulation effect is the best.