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| 回转窑直接还原法 (【技】以连续转动的回转窑作为反应器，以固体碳作为还原剂，通过固相还原反应把铁矿石炼成铁的直接还原炼铁法。其产品由于还原失氧形成大量微气孔，形似海绵，故也称为海绵铁。) | |||
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