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Ario Iron Ore Mining Group

Hematite & Magnetite Iron Ore Concentrate, Lump & Fine.

Hematite Iron Ore

Hematite Iron Ore Properties

Hematite, also spelled as hamatite, is the mineral form of iron(III) oxide (Fe2O3), one of several iron oxides. Hematite crystallizes in the rhombohedra lattice system, and it has the same crystal structure as ilmenite and corundum. Hematite and ilmenite form a complete solid solution at temperatures above 950 °C (1,740 °F).Hematite occurs in a range of forms, and its color can range from black to gray, or from red to brown depending on which variety is present. It is also be responsible for the red color of many minerals such as Garnet, Spinel, and to some extent, Ruby. Non-crystalline forms of Hematite may be transformations of the mineral Limonite that lost water, possibly due to heat. Regardless of their different appearances, all varieties of hematite exhibit a distinctive reddish-brown streak that serves to distinguish it from most common minerals. The mineral’s most common varieties are metallic and earthy hematite. Metallic hematite, also called specular hematite, has a shiny luster and may exhibit a micaceous habit, which means that it is easy to break small flakes off a sample. The flakes are quite hard, but are easily separated from the sample, making it difficult to recognize the mineral’s hardness. Some metallic hematite samples have a rounded bumpy surface that formed as fibrous crystals of hematite grew out from a surface into a fluid-filled space. Earthy forms of hematite are typically red to reddish brown and often called ‘Red Ochre’. These earthy varieties are also very soft and can be scratched by a fingernail. Occasionally, hematite may even occur as small rounded oolites. Oolites are small, sand-sized spherical or oval grains that form as hematite precipitates from fluids. Typically oolites consist of thin concentric crystal layers that, on broken surfaces, appear as nested spheres or ovals. When not broken, hematite oolites appear to be red, well-rounded sand grains or may be mistaken for lithified fish eggs.Hematite occurs in a variety of igneous and metamorphic rocks, but is most abundant in sedimentary settings. In sedimentary rocks, hematite can either have formed from have originally formed directly from direct precipitation out of marine waters, or as a concentration and enrichment deposit formed from groundwater.Regardless of its setting, hematite is usually found with other iron-bearing minerals, especially magnetite, goethite and siderite. Much hematite occurs in a soft, fine-grained, earthy form called red ochre or ruddle. Intermediate between these types are compact varieties, often with a reniform surface (kidney ore) or a fibrous structure (pencil ore). Red ochre is used as a paint pigment; a purified form, rouge, is used to polish plate glass.

Hematite Iron Ore Uses

With few exceptions, the economic uses of hematite revolve about its iron-rich composition and characteristic red color. Its name comes from ‘haima’, the Greek words for blood, a reference to hematite’s distinctive color. Other minerals, such as magnetite, contain higher concentrations of iron, but hematite is so much more abundant that it is the most economically important iron ore. In North America, over 90% of our iron comes from hematite deposits and without hematite our steel-based society could not exist. The use of iron and steel throughout the industrial world is so prevalent that it is difficult for many people to imagine a world without them.

Hematite Iron Ore Deposite

Hematite iron ore deposits are currently exploited on all continents, with the largest intensity of exploitation in South America, Australia and Asia. Most large hematite iron ore deposits are sourced from met somatically altered banded iron formations and rarely igneous accumulations.The most important deposits of hematite are sedimentary in origin. The world’s largest production (nearly 75 million tons of hematite annually) comes from a sedimentary deposit in the Lake Superior district in North America. Other important deposits include those at Minas Gerais, Brazil (where the hematite occurs in metamorphosed sediments); Cerro Bolívar, Venezuela; and Labrador and Quebec, Canada. Hematite is found as an accessory mineral in many igneous rocks; commonly as a weathering product of siderite, magnetite, and other iron minerals; and almost universally as a pigmenting agent of sedimentary and other rocks. For detailed physical properties, see oxide mineral (table).

Hematite & Magnetite  Difference

Hematite iron is typically rarer than magnetite bearing banded iron formations or other rocks which form its main source or protolith rock, but it is considerably cheaper and easier to beneficiate the hematite ores and requires considerably less energy to crush and grind. Hematite ores however can contain significantly higher concentrations of penalty elements, typically being higher in phosphorus, water content (especially pisolite sedimentary accumulations) and aluminium (clays within pisolites).