Magnetite Black Oxide
Magnetite is used as a raw black pigment in ceramic glazes, as well as non-ceramic products like polishing compounds, cosmetics, medicines, fillers, construction materials, and inks. As the most magnetic mineral on Earth, magnetite is highly effective as a contrast agent in Magnetic Resonance Imaging (MRI). Also known as black iron oxide or black magnetite oxide, magnetite is a reliable source of iron for ceramic applications
- Cost effective
- Provides ceramic glaze colouration after being fired at high temperatures
- Suitable for corrosion-resistant purposes and paints
- Suitable for coal washing due to high density and fine milling
- Able to be recovered by magnetic separation after coal washing
- Non-fouling; subsequent treatment stages are unaffected by trace deposits
- High purity; free of hematite, sulphides, etc.
Ferrous iron oxide magnetite (Fe304) is the concentrate of magnetite ore that contains 96% magnetics. Higher iron levels can be achieved through further magnetic separation and milling.
- Durable and stable
- Grain size ranges from coarse to ultra-fine
- Meets requirements of centrifuge-assisted dense medium separation and coal preparation
Magnetite is a major iron ore. It is a lustrous, black mineral with the that occurs naturally in igneous and metamorphic crystals, masses, and as a loose sand. The size and abundance of these deposits make magnetite available for heavy use in many industries.
Magnetite is named for its strong magnetism. It is the most magnetic mineral that occurs in nature. The magnetism is generated by the spinel arrangement with transference of electrons between the two different ions. It contains iron in two oxidation states, Fe3 (ferric) and Fe2 (ferrous). This is a unique quality among iron oxides.
Many of magnetite’s applications are possible because of its strong magnetism, intense black colouration, abundance, affordability, and high iron content.
Applications of Magnetite Oxide
Due to its high iron content and availability, magnetite is widely used in the production of iron and steel, as well as in water purification processes. It is also used in medical imaging and to remove contaminants leftover from industrial processes, because of its high magnetism.
One of the most common applications of magnetite powder is as a pigment in paints, ceramics, inks, dyes, and other industries that require black colouration. Black magnetite oxide absorbs light better than most other common pigments and therefore is an affordable and reliable method of producing black. It has been used as a black pigment since the popularity of painted terracotta pottery in ancient Greece. Much of the pigments used then have lasted and continue to be of high quality today. Paints and inks made with magnetite are prized for their resistance to water, as well as mild acids and bases.
Since the inception of data recording, magnetic tape has been a preferred method of storing data. Still today, 77% of surveyed companies stated that they still use magnetic tape for data recording and storage. Like the pigment, it is known for its longevity and suitability for archiving. Due to its high magnetism and iron oxide content, magnetite has been used in the production of magnetic tape for decades.
The production of ammonia requires the conversion of atmospheric nitrogen with hydrogen, using magnetite oxide as a catalyst. The magnetite must undergo a process before being used in ammonia production. The ground magnetite powder is partially reduced, releasing some of the oxygen and leaving behind a magnetite core with an iron shell. This process, which is known as the Haber-Bosch or H-B process, gives the magnetite a highly-porous and greatly increased surface area, which makes it highly active.
Another common application of magnetite powder is in the production of synthetic fuel. Carbon monoxide and hydrogen are converted into hydrocarbons through a process known as the Fischer-Tropsch or F-T process. The small, single-chain hydrocarbons can be processed through cracking, reforming, and isomerization into synthetic fuels. These hydrocarbons are essential to the production of petroleum products that are needed worldwide in virtually endless industries and applications.
Para-nitrophenol is a known contaminant that is a by-product of many industrial processes. To eliminate this substance through decomposition, magnetite is used to catalyse the degradation of peroxide. This produces hydroxyl radicals that assist in the decomposition of para-nitrophenol. This process is often used in the petrochemical, paper manufacturing, and pesticide production industries to eliminate pollutants and contaminants.
In addition to magnetic resonance imaging (MRI), magnetite can be used in the medical field to extract DNA and has shown to outperform commercial DNA extraction kits. Extracts obtained with magnetite were suitable for enzyme digestion, as well as the polymerase chain reaction process.
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