氧化鐵
三氧化二鐵者，即鐵銹也，或曰氧化鐵。鐵遇大氣之水與氧二者，變而生此物也。 赤鐵礦乃此物。並三氧與二鐵生之，式 Fe 2 O 3 }} 。此非官品。
反應
古今之煉鐵者，並三氧化二鐵與木炭，高温燒之，成鐵。式如下:
左右反應率之參數
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