Effective granulation is the formation of granular structure with return as core and concentrate fines as adhering layer.
机理研究表明：理想的制粒效果是形成以返矿为核心，以细粒精矿的粘附料的制粒小球结构模型。
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。
It is showed from the result that with concentrate iron fines being grained, lime-rock added in and anthracite finely ground, the percentage metallization can get higher greatly.
结果表明：铁精粉制粒后、加入石灰石、无烟煤细磨后，金属化率大幅度提高。
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