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加拿大和美国的磁性铁燧岩,苏联的磁铁石英岩,大都属于硬质贫磁铁矿,对于上述矿石采用湿式自磨技术,目前遇到了某些新问题。其中主要是入选矿石平均(普氏)硬度系数较高,一般为16～20,个别达24以上;矿体中各种矿石类型之间和矿石与岩石之间,硬度差别很大,有时达0.5～1倍。使六十年代和七十年代初期所用的一般自磨流程,不能适应这种矿石性质,造成磨矿过程很不稳定,自磨机磨矿效率低。
Magnetic taconite in Canada and the United States, magnetite quartzite in the Soviet Union mostly belong to hard lean magnetite, and some new problems have been encountered for the above ores using wet self-abrasion technology. Among them, the average hardness of the selected ore (Platts) is high, generally 16-20, with individual values of 24 or more. Hardness varies greatly between ore types and between ores and rocks in ore bodies, sometimes up to 0.5 ~ 1 times. The general self-grinding process used in the 1960s and early 1970s can not adapt to the nature of this ore, resulting in a very unstable grinding process and a low grinding efficiency from the grinding machine.