陶瓷墙地砖干法造粒过程坯料粉体成形与造粒室转速的影响

为分析陶瓷墙地砖干法造粒过程坯料粉体成形与造粒室转速的关系.基于欧拉-欧拉双流体模型模拟陶瓷干法造粒混料过程数理模型,同时对坯料粉体粗糙度、粉体级配及粉体流动性指数进行实验分析,验证数值模拟的正确性.当造粒室转速分别为120 RPM、140 RPM、160 RPM时,坯料粉体体积分布大小基本保持不变,坯料粉体均匀性和分散性逐渐变好,团聚现象逐渐消失;当造粒室转速分别为180 RPM、200 RPM时,坯料粉体体积分布大小仍基本保持不变,坯料粉体均匀性和分散性逐渐变差,团聚现象逐渐明显.实验结果表明:当造粒室转速分别为120 RPM、140 RPM、160 RPM、180 RPM、200 RPM时,坯料粉体粗糙度系数平均值依次为1.79、1.77、1.68、1.74、1.78;粉体级配百分比依次为73％、77％、89％、80％、72％;流动性指数依次为63.54、66.95、69.75、68.32、67.21.综合分析说明:造粒室转速为160 RPM时,坯料粉体均匀性和分散性良好,且无明显团聚现象,此时坯料粉体粗糙度系数平均值最小、粉体级配百分比最高、流动性指数最大,即造粒效果最好.

Effect of Blank Particles Forming and Speed of Granulating on Dry Granulation Process of Ceramic Wall and Floor Tiles

the granulating chamber in the dry granulation process of ceramic wall and floor tile .Based on Eulerian-Eulerian two-fluid model to simulated the mixing process .At the same time, the roughness of the powder , the powder gradation and the powder flowability index were analyzed to verify the correctness of numerical simulation .Simulation results showed:When the speed of granulating speed is 120 RPM, 140 RPM, 160 RPM, the size distribution of the powder remained unchanged , the uniformity and dispersion of the powder were gradually improved , and reunion phenomenon gradually disappeared;When the speed of granulating speed is 180 RPM, 200 RPM, the size distribution of the powder still remained unchanged , the uniformity and dispersion of the powder were gradually reduced , and reunion phenomenon gradually appeared .The experimental results show that when the speed of granulating speed is 120 RPM, 140 RPM, 160 RPM, 180 RPM, 200 RPM, the average value of roughness coefficient is 1.79, 1.77, 1.68, 1.74, 1.78; The percentage of powder content is 73％, 77％, 89％, 80％, 72％;And the liquidity index is 63.54, 66.95, 69.75, 68.32, 67.21.Comprehensive analysis show: when the speed of granulating speed is 160 RPM, the powder has good uniformity and dispersion , and no obvious agglomeration phenomenon , at the same time , the average roughness coefficient of the blank powder is the smallest, the percentage of the powder gradation is the highest , and the fluidity index is the largest , granulation effect is the best .