iron ore. iron ore is rock containing enough iron content, and in sufficient volume and accessibility to mining and transportation to be able to be economically mined. iron in ore iron is most commonly found in the form of magnetite fe 3 o 4 , hematite fe 2 o 3 , goethite feo oh , limonite feo oh ·n h 2 o or siderite feco 3 .
weak magnetic separation. weak magnetic separation is used to create cleaner iron-rich products that can be reused. these products have low levels of impurities and a high iron load. this technique is used as a recycling technology. it is coupled with steelmaking slag fines as well as a selection of particle size screening.
once the conversion of iron-oxides occurs, magnetic separation may proceed to extract magnetic ores. additionally, another beneficiation technique used for primary ores is froth flotation. froth flotation is used after roasting of primary ores, where the magnetite or other primary ore is further separated forming a concentrate. references
iron iii oxide was the most common magnetic particle used in all types of magnetic storage and recording media, including magnetic disks for data storage and magnetic tape used in audio and video recording as well as data storage . its use in computer disks was superseded by cobalt alloy, enabling thinner magnetic films with higher storage density.
the prefix ferro-refers to iron, because permanent magnetism was first observed in lodestone, a form of natural iron ore called magnetite, fe 3 o 4. all substances exhibit some type of magnetism. ferromagnetism is responsible for most of the effects of magnetism encountered in everyday life, but there are actually several types of magnetism.
iron oxide nanoparticles are iron oxide particles with diameters between about 1 and 100 nanometers. the two main forms are magnetite fe 3 o 4 and its oxidized form maghemite γ- fe 2 o 3 . they have attracted extensive interest due to their superparamagnetic properties and their potential applications in many fields although co and ni are also highly magnetic materials, they are toxic and easily oxidized .
for biomedical applications like magnetic resonance imaging, magnetic cell separation or magnetorelaxometry, where particle size plays a crucial role, magnetic nanoparticles produced by this method are very useful. viable iron precursors include fe 3, fe co 5, or fe 3 in organic solvents with surfactant molecules. a combination of xylenes and .
thereafter, the ore is physically separated from any unwanted impurity, depending on the form of occurrence and or further process involved. separation processes take advantage of physical properties of the materials. these physical properties can include density, particle size and shape, electrical and magnetic properties, and surface properties.