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Iron-oxides are usually formed by precipitation from iron-enriched groundwater. Iron-oxide pigments consist of ferrous or ferric oxides, and impurities such as clay and/or manganese. Natural iron-oxide pigments have been used for centuries as coloring agents. Iron-oxide pigments are valued because they are nontoxic, weather resistant and they do not bleed or fade. The pigments are extracted from a range of ores including hematite, goethite, limonite, siderite, and magnetite. Hematite produces red pigments, limonite and goethite produce yellow and brown pigments, siderite produces brown and red pigments, and magnetite yields black pigments.
Virginia is one of four states actively producing natural iron-oxide pigments. In , approximately 519 tons of natural iron-oxide were reportedly mined and produced from stockpiles in Virginia, making it the fourth largest producer in the United States (Potter, ). Hoover Color Corporation in Hiwassee, Pulaski County, produces ochres, umbers and siennas. Hoover Color also produces iron-oxide pigments from the Painter Mine in Wythe County. Open pit methods are used to mine these natural iron-oxides. The iron-oxides were formed by precipitation from iron-enriched groundwater, near the contact of the Cambrian (543 to 490 million years ago) Erwin Formation with the overlying Cambrian Shady Dolomite. Deposits, associated with gossans formed from weathering of the Cambrian rocks, are concentrated as small bodies or pockets composed of insoluble clay and iron oxide.
Iron-oxide production in Virginia, -.
Selected References:
Gilmer, A. K., Enomoto, C. B., Lovett, J. A., and Spears, D. B., , Mineral and fossil fuel production in Virginia (-): Virginia Division of Mineral Resources Open-File Report 05-04, 77 p.
Potter, Michael J., , Iron-Oxide Pigments: U.S. Geological Survey Minerals Yearbook, p. 41.1-41.3.
Virginia Division of Mineral Resources, , Geologic Map of Virginia: Virginia Division of Mineral Resources, scale 1:500,000.
Synthetic Iron Oxide is amongst the most crucial components of the Inorganic Pigments family. In addition to that, they are also the highest-selling pigments across the world after Titanium Dioxide.
The iron oxide pigments have been used as colorants for ages with early humans using them to paint on cave walks. While the natural pigments are derived from various iron oxides minerals, the synthetic pigments are produced under controlled conditions get the desired
But what is the reason behind their amazing popularity across the world? Synthetic Iron Oxide pigment are highly stable and possess good strength. Moreover, they are resistant to UV rays, salty weather, and other harsh atmospheric conditions. Also, they are non-hazardous and entirely safe for transport and use.
Also, they are comparatively cheaper than the organic iron oxides pigments due to the low cost of raw material as well as synthetic iron.
The red, yellow, and black colours are primarily used to produce single-component forms. Orange and brown, on the other hand, are made as blends.
Let us have a look at the characteristics and synthetic iron oxide uses.
Synthetic red oxide pigments are the most common ones, and they also contain the highest amount ofiron. Owing to their pure hue, consistent properties, and tinting strength, red oxides are gaining immense popularity in various fields.
Synthetic red oxide pigments have the following characteristics:
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In addition to the characteristics mentioned above, they have got pure hue and consistent properties.
Red Iron Oxide is mainly used in paints and coatings, rubber, paper, cement colours, and construction. The building materials industry consumes the highest amount of iron oxide pigment. It is because these pigments possess good dispersibility and tinting strength. They are used for coloring concrete, mortar, paving blocks, chequered tiles, and much more.
At Bansal Trading Company, you will find the following red iron oxide pigments of ultimate quality:
The synthetic yellow iron oxide has an extremely fine particle size (but not as fine as the black or red oxides). The actual ones have around 85% Fe2O3 and about 12% LOI with some impurities. These oxides are used in situations where raw colour or raw properties are crucial for the manufacturing process.
It is comparatively fluffier than the red one but lesser than black iron oxide pigment.
Yellow oxides are widely used in paints, enamels, concrete colorants, plastics, rubber, and also paper (where permanent yellow is needed).
Synthetic Black iron oxide acts as a source of Fe in ceramic applications, particularly at places where raw black colour is crucial. The key difference between the red and black iron oxide pigments is that the red iron oxide is ferromagnetic, and black iron oxide is ferrimagnetic.
The black iron oxide pigment is used as a colorant for a wide array of non-ceramic products as well. Moreover, these black oxides are also used for resisting corrosion on various appliances. They are also a component of anti-corrosion paints (used in many bridges).
The synthetic orange iron oxide pigments are extremely concentrated dry powder having a very fine particle size.
Orange iron oxide pigments are often used in different kinds of cement mortars, including plasters, tile mud, floorings, stamped concrete, blocks, etc. In addition to that, these pigments are also used in various color plastics, water-based and oil-based paints, soaps, fertilizers, and even feed products.
The brown iron oxide pigments are dry colored powder used to colour concrete. These oxides are basically a mixture of red, yellow, and black oxides. This blend gives them a fairly medium brown pigment with slight red tones.
The synthetic brown iron oxides pigments are used for a variety of purposes, such as in decorative cosmetics, including foundations, lipsticks, nail lacquers, eyeliners, lip liners, etc.
However, their use is not just confined to cosmetics only. These pigments are also used in the construction industry for the coloration of concrete.
The synthetic iron oxides industry is growing day by day with the growing demand across various industries. Different iron oxide pigments such as red iron oxide, black iron oxide, brown iron oxide, yellow iron oxide, orange iron oxide, and many others are being produced synthetically at a large scale.
These pigments are comparatively cheaper than the organic ones and superior in quality.
All of these pigments have different uses based on the properties they possess. Moreover, the recent developments in the synthetic iron oxides pigment industry, such as granular forms of iron oxides and enhanced versions of nano-sized materials.
If you have a paint, plastics, or rubber making business, or need Synthetic iron oxide pigment for other industrial purposes, you can contact reputed chemical distributor in India for rates, terms of payment, shipping, and more. Bansal Trading Company is one of the leading and renowned dealers of chemical substances in India. You can us at or call us at 011 for Iron oxide manufacturers in India or any premium quality products for various purposes.
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