自1967年美国伊里公司推广应用平面细筛以来,国外若干国家的几十个选厂相继推广应用。我国于七十年代中后期也有十几个选厂陆续采用了平面细筛,至今投入生产使用的细筛已超过两千台。尽管细粒筛分工艺在国内外均得到较广泛的应用,但如何评价细筛的工作效率则尚无完善及统一的办法。根据细筛工作 Since 1967, the United States Yili company to promote the use of flat screen since the number of foreign countries dozens of selected factories have been promoting the application. In the mid and late 1970s, more than a dozen factories in our country successively adopted plane fine screens. The fine screens put into production and used so far have exceeded 2,000. Although the fine-grained screening technology has been widely used both at home and abroad, there is no perfect and uniform way to evaluate the working efficiency of fine-grained screening. According to the fine screening work