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Most of the magnetite mined is used as an ore of
iron. Iron liberated from the ore is usually used to make iron, steel and other alloys.
Use of Magnetite as a Heavy MediaPowdered magnetite is often mixed with a liquid for used as a heavy media for specific gravity separations. Much of the high sulfur coal that is mined is floated across a slurry of magnetite. Clean coal particles float and those contaminated with pyrite (a sulfide mineral with a high specific gravity) sink into the high-density slurry.Use of Magnetite as an Abrasive The abrasive known as "emery" is a natural mixture of magnetite and corundum. Some synthetic emery is produced by mixing magnetite with aluminum oxides. Producing it synthetically allows control over the particle size and the relative abundance of aluminum oxide and magnetite. Some finely ground magnetite is also used as an abrasive in water jet cutting. In the past few decades synthetic abrasives have filled many of applications where magnetite was previously used. Other Uses of MagnetiteOther uses include: as a toner in electrophotography, as a micronutrient in fertilizers, as a pigment in paints, as an aggregate in high-density concrete.Magnetite and Earth's Magnetic FieldTiny crystals of magnetite are present in many rocks. In the crystallization of an igneous rock, tiny crystals of magnetite form in the melt, and because they are magnetic, they orient themselves with the direction and polarity of Earth's magnetic field. This preserves in the rock the orientation of Earth's magnetic field at the time of crystallization.Today geologists can study the magnetic properties of rocks of various age and reconstruct the history of change in Earth's magnetic field. This information is available for multiple locations on multiple continents. It can also be used to learn about the movement of continents over time. A similar orientation of tiny magnetite grains occurs in the settling of sediment particles, locking clues to Earth's magnetic history into some sedimentary rocks. Contributor: Hobart King
:: برچسبها: Properties, economic geology, Magnetite and Lodestone, uses  نویسنده : R
تاریخ : جمعه ۲۲ شهریور ۱۳۹۲
زمان : 22:45
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