Toda United Indusrial (Zhejiang) Co., Ltd.

Natural Iron Oxide Pigments

Addtime: 2017/04/24   Read:83  Font size: Large Small

Natural iron oxides are derived from hematite, which is a red iron oxide mineral; limonites, which vary from yellow to brown, such as ochers, siennas, and umbers; and magnetite, which is black iron oxide. Synthetic iron oxide pigments are produced from basic chemicals. The three major methods for the manufacture of synthetic iron oxides are thermal decomposition of iron salts or iron compounds, precipitation of iron salts usually accompanied by oxidation, and reduction of organic compounds by iron.

One or more ferrous or ferric oxide and many other impurities such as clay, manganese or organics are all included in the formation of the natural Iron Oxide Pigments. The most important source of Natural Iron Oxide Pigments is Hematite. Hematite is a oxide of iron having red color. The color of hematite varies from yellow to brown, such as siennas, umbers and ochers. But, these pigments can also be derived from another iron ore, i.e. Magnetite having a black color. The main characteristics of natural iron oxide pigments are: these are light fast, non bleeding, nontoxic and weather resistant.

Uses of Natural Iron Oxide Pigments

As these pigments have various unique properties so these pigments are used for various purposes. The various uses of these pigments are in coloring concrete block, outdoor paintings and in other construction materials. The maximum mining and procession of natural iron oxide is done in USA. Pigments are in paints, wood and paper stains, linoleum, oilcloth, mortar, plaster, rubber, brick, and other pigmented materials.

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