The types of iron ore (such as hematite, magnetite) affect the smelting process and end use. For example, magnetite (containing 72.4% iron) is often used for direct smelting due to its high grade.
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Magnetite (Fe₃O₄): The density is 5.16-5.18 g/cm³, and it has become an important iron ore due to its high iron content (72.4%) and strong magnetism.
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The main components of iron ore are
The main component is iron hydroxide (the chemical formula can be expressed as mFe₂O₃·nH₂O), with an iron content of about 62%, is yellow or brown, and has a specific gravity of 3.6–4.0.
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