The content and mineralogy of pyrite do not change during magnetic roasting and separation, the sulphur in the tailings and iron concentrate has occurred still in the form of pyrite.

• 黄铁矿在磁化焙烧-磁选过程中，其组成和矿物特征的变化都不明显，最后仍以黄铁矿的形态保留在尾矿和铁精矿中。