显著影响型砂渗透系数的因素是通流面积与抽气面积的比值，型砂粒度以及二者之间的交互作用，其影响程度依次减小。
The factors that remarkably affect the permeability of sand were the ratio of course area to pump area, granularity of the dry-sand and their interaction, and their affecting degree minished in order.
应用skr - 80型砂磨机，对多种催化裂化催化剂物料进行了砂磨试验，找出了沸石结晶度、粒度等物料性质在砂磨过程中的变化规律。
Various FCC catalysts and relevant materials were ground by using SKR 80 sand grinder. The changes of zeolite crystallinity and particle size during grinding were found.
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