Iron trioxide, chemical formula Fe3O4. Also known as iron oxide black, magnet, magnetite, or black iron, it is a black crystal with magnetism, hence it is also called magnetic iron oxide. It cannot be pronounced as “ferrous metaferrite” or “ferrous metaferrite” Fe (FeO2) 2, and is not a mixture of iron oxide and ferrous oxide, but can be approximated as a compound of ferrous oxide and ferrous oxide. This substance is soluble in acids, insoluble in water, alkali, and organic solvents such as ethanol and ether. Natural ferric oxide is insoluble in acids and can easily oxidize into ferric oxide in the air in humid conditions. Usually used as a pigment and polishing agent, it can also be used to manufacture audio tapes and telecommunications equipment.
Iron trioxide has a high hardness and magnetism, and can be regarded as a compound composed of ferrous oxide and iron oxide, in the form of inverse spinel and cubic crystal systems. It can move directionally under an external magnetic field, has superparamagnetism within a certain range of particle size, and can generate heat under the action of an external alternating electromagnetic field. Its chemical properties are stable, making it widely used.
Iron Oxide Uses
Ferric oxide is used in industries such as medicine, metallurgy, electronics and textiles, as well as as catalysts, polishing agents, pigments in paints and ceramics, glass colorants, etc. Special magnetic iron oxide can be used to make audio tapes and telecommunications equipment. The application fields of spherical ferroferrite magnetic powder are as follows:
- Raw materials for the production of high-end toner for laser printers and raw materials for the production of toner for copiers (high coercivity).
- Magnetic seal, which can be used as a rotating shaft seal for mechanical seals.
- Metals, ceramics, nanoceramics, composite ceramic substrates, ferrite materials.
- The cathode plate of alkaline dry batteries can be used for steel flaw detection in the machinery manufacturing industry.
- Anti-UV materials, microwave absorbing materials, and magnetic recording materials.
- Magnetic health-care materials can be widely added to various types of chemical fibers, plastics, rubber, etc. to produce various health-care products and health-preserving products.
- Coloring of building structures and concrete products. Watercolor, paint, paint, etc.