Processes of manufacture of natural and synthetic iron oxides
The natural iron oxide is a product that has been forming for millions of years. Because of the different movements suffered by the Earth, the incandescent poor iron coming from the interior went out, imprisioned between several stone layers in the which it cooled off acquiring different tonalities. Acording to nature of the minerals, the temperature inside the Earth, as well as the speed of cooling the in the highest layers, those tones ranged from yellowish or ocher to black , and among them red, brown and orange.
The natural iron oxide is extracted from mines operated both to open sky and from the interior cavities. Then the mineral passes through a milling process just after a calification phase, now ready for its commercialization in the different industrial marckets.
Synthetics iron oxide is made artificially by adding chemical agents, such as acids, to scrap iron while standing in a reactor. The iron reacts undoing of it and creating a paste, coloured according to the kind of acids and the temperature. That paste passes to a dryer and eventually to a mill, obtainig the final pigment ready for its industrial application.
Differences between natural and synthetic iron oxides are mainly two:
1 The process to obtain them.
2 The synthetic iron oxide has a higher tinting strength, what subsequently makes it cheaper. But you cannot say that natural iron natural iron oxide is a worst qualified pigment. Being a great antioxidant agent compensates its lower tinting strength. That is the reason why it has been used for a long time in the antioxidant and anticorrosive painting manufacture, used for painting boats and many other types of great quality industrial coatings. The production process is the reason why synthetic iron oxide is more difficult to obtain, because you have to be very careful in controlling the chemical reaction in which iron and acids must go through. Otherwise you can eventually produce an oxidant paint instead an antioxidant one. Only with a top quality control, like Oxirrein' s ones, you can obtain the best results.
Uses and applications of iron oxides
The natural iron oxides are pigments that have been used since the man begun walking on the planet. The primitive man used it to paint his body and to decorate his houses and caverns.
Today it is used like pigment in many different industrial applications. Both natural and synthetic iron oxide are used in the following types of industry: