The iron oxide melting point is the temperature at which the molten iron oxide forms when it is exposed to air or water. It is a very important property for ceramic makers to know and is also an indicator of the color that a fired glaze will develop.
Iron oxides feature as ferrous (Fe2+) or ferric (Fe3+). They adopt octahedral or tetrahedral coordination geometry and are often referred to by the names Fe2O3 or Fe3O4. Their chemical composition can vary based on their mineralogy.
Hematite, a naturally occurring iron oxide, is one of the most important iron minerals. It is an important component in a variety of products including iron alloys, pigments and magnetic recording tapes.
There are a few different ways to prepare this iron oxide powder. The dry method involves nitric acid reacting with iron flakes to form ferrous nitrate, which is cooled and dehydrated before grinding. It is then calcined at 600 to 700 degrees Celsius for 8 to 10 hours. The result is a red iron oxide powder.
This product is insoluble in water but dissolves well in strong acid, e.g. hydrochloric, sulfuric, and oxalic acids. It is used as a dyeing agent and as an anti-rust pigment. It is also used as a metal polishing agent and as a catalyst. It is also a source of ferrite elements for magnetic materials. It is a cheap and durable pigment. It can be used in paints and coatings, as well as colored concrete.