In this paper, an attempt has been made to study the reduction swelling characters and mechanism of pellets made mainly of Carajas hematiteconcentrate.
但目前国内对球团的研究主要集中于如何提高其机械强度，对其还原膨胀方面的研究较为欠缺。
2
The domestic ores are fine magnetite concentrate, and the imported ores mainly are hematite sinter fines.
国产铁精矿是细粒度的磁选精矿，进口铁矿则以粉状赤铁矿为主。
3
Since magnetite concentrate in AnSteel Groupe mining corporate do not fully meet the consumption requirements of pellets, hematite and magnetite concentrate are mixed to prepare pellets.