Mill scale is the by-product acquired during the lamination and heating after a hot rolling process for a production of steel article, as metal sheets and plates. This mill scale can be easily removed from the surface of steel by abrasive or pickling blasting and flame cleaning. Basically, Mill scale is widely useful for several applications from the making of steel to iron oxides for a pigment and its related fields. Usually, this scale is hard, brittle coating of many distinct layers of iron oxide formed through the MineralRecycling.com steel processing. An average mill scale acquired during a metal hot working that has iron content ranges from 68% to 75%. An iron detected in the material is there in various forms of chemical such as:
– Magnetite and Fe3o4 of characteristic steely blue-gray color
– Magnetite inner part comprises fine metal grains as well as residual ferrous oxide, which is black colored FeO.
– Thin outer film of Fe2O3, Hematite
The most effective advantage is using the mill scale is that it does not contain explosive or radioactive substances and dangerous inflammable items. The material of mill scale is fully free from non ferrous metals, any kind of foreign material, excessive rust, dirt and corrosion. There are so many manufacturers and transports of mill scale available to provide a quality service before products and during loading.
In fact, this mill scale is recyclable because of high iron contents as well as useful for various recovery applications such as:
– Iron oxide is used in the exothermic welding
– As flux for mainly welding an electrode coating
– Iron source as the cement production
Iron mill scale recycled in the steel plants as the mix component in iron ore sinter production. It is also used with other iron bearing material for sponge iron production. After proper treatment and cleaning, this mill scale can be used for the iron powder production in the powder metallurgy applications. In fact, iron mill scale can be used as the replacement of aggregates or cement in a concrete production.
If anyone is looking for the export mill scale, then there are plenty of manufacturers and producers available to offer excellent quality mill scale. It is often present on the raw steel which is mistaken frequently for the blue colored primer. Virtually, removal of mill scale is highly impossible in hand as well as extremely time consuming and tedious cleaning methods.
Generally, the mill scale is the kind of iron oxide, which is formed on the steel surface during the process of hot rolling. A high surface temperature combined with the high roller pressure that result in the bluish gray, smooth surface. If the mill scale is well adhered covering to a steel section, it may be the ideal protective barrier. However, mill scale is not all uniform, nor it is well adhered. It is concerning the item for many projects that have had expensive, high quality protective coating applied over mill scale directly as well as inadequately prepared steel to have an entire coating system and structure fail within the short span of time.