These sedimentary rocks consist of alternating layers of iron-rich minerals and silica or chert. It is the primary source of iron for the global market and is often found in large, concentrated banded iron formations.
Iron Ore Types Future Supply Demand Trends
Hematite (Fe2O3) Hematite is often regarded as the most important iron ore types due to its high iron content, which typically ranges between 56% and 70%. The two main subtypes are hardcap and limonite laterites, which require different processing techniques, often involving high-temperature reduction rather than traditional magnetic separation.
Ores with higher iron content, or "head grade," are more valuable because they yield more metal per ton of rock processed. However, commercial magnetite ores usually contain iron in the 30% to 40% range due to impurities.
Iron Ore Types Future Supply Demand Trends
The key characteristic of magnetite is its oxidation state; when processed, it releases oxygen and transforms into hematite, a process that generates heat. The distinct banding is visually apparent in quarry faces and provides a reliable indicator of ore quality.
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