摘要
针对陶瓷外墙砖干法造粒坯料颗粒与膨润土含量的影响,以黏土类、石英类、长石类等超细粉体为主要原料,基于不同膨润土含量采用干法造粒制粉技术制备坯料颗粒,检测坯料颗粒休止角、压缩度、平板角、均齐度、凝聚度以计算分析坯料颗粒流动性指数,筛选坯料颗粒获得颗粒级配以计算坯料颗粒合格率,测量坯料颗粒球形度,基于测定的物性参数,分析膨润土含量对陶瓷外墙砖干法造粒效果的影响,同时数值仿真验证结果的可靠性。实验结果表明:当膨润土含量分别为1%、3%、5%、7%、9%时,坯料颗粒流动性的流动性指数依次为58.0、69.0、91.0、67.5、58.0,坯料颗粒合格率依次为82.1%、82.7%、85.9%、77.6%、20.9%,平均颗粒球形度依次为0.24、0.42、0.71、0.70、0.70。同时数值模拟结果表明:当膨润土含量分别为1%、3%、5%、7%、9%时,在造粒室形成的堆积度依次为0.38、0.36、0.33、0.35、0.39,且当膨润土含量为5%时,坯料颗粒分散性最好,说明实验结果与数值模拟基本吻合,验证了实验的可靠性,表明当膨润土含量为原料的5%时,陶瓷外墙砖干法造粒坯料颗粒流动性指数、坯料颗粒合格率、颗粒球形度最优。
In order to investigate the influence bentonite content,particles with different bentonite content for manufacturing ceramic external wall brick are prepared by dry granulation using clay,quartz and feldspar as main raw materials.The angle of repose,compressibility,flat angle,homogeneity and cohesion are tested for the measurement of the particle liquidity index.Particles are sieved to get the grain size distribution and to calculate the qualified particle rate.The particle sphericity is also detected.Based on the obtained parameters,the effect of bentonite content on the dry granulation of blank particles for ceramic brick is analyzed.At the same time,the reliability of the results is verified by numerical simulation.The experimental results show that when the content of bentonite is 1%,3%,5%,7%,and 9%,the liquidity index of blank particles is 58,69,91,67.5,and 58,the blank particle qualified rate is 82.1%,82.7%,85.9%,77.6%,and 20.9%,and the average sphericity of the blank particles is 0.24,0.42,0.71,0.70,and 0.70.At the same time,the numerical simulation results show the accumulation formed in the granulating chamber is 0.38,0.36,0.33,0.35 and 0.39 when the content of bentonite is 1%,3%,5%,7%,and 9%;when the bentonite content is 5%,the blank particle dispersion is the best.The experimental results and the numerical simulation results are consistent,verifying the reliability of the experiment,showing that the liquidity index,the qualified particle rate and the particle sphericity are the best when the content of bentonite is 5%.
作者
余冬玲
刘子硕
黄韩凌燕
YU Dongling;LIU Zishuo;HUANG Hanlingyan(School of Mechanical and Electronic Engineering,Jingdezhen Ceramic Institute,Jingdezhen 333403,Jiangxi,China;School of Ceramic Art,Jingdezhen Ceramic Institute,Jingdezhen 333403,Jiangxi,China)
出处
《中国陶瓷工业》
CAS
2019年第1期9-14,共6页
China Ceramic Industry
关键词
干法造粒
膨润土含量
流动性指数
合格率
颗粒球形度
dry granulation
bentonite content
liquidity index
qualified particle rate
particle sphericity
