An intro-duction was made to the filtering principles, advantages and shortages of three types of common filters, their choice and placement when being used in sand faced cast iron mould process.

• 分析了铁液,特别是球铁铁液中夹杂物的来源,介绍了三种常用过滤器的过滤原理和优缺点及在覆砂铁型铸造工艺中过滤器的选择和放置方法。