What things to know about the oxidation of minerals that contain iron?

The oxidation of minerals that contain iron is a process that alters the mineral's composition. Iron oxides have many beneficial properties as well as many detrimental properties. Iron oxides are used to produce paints, paper products, and photography chemicals to develop film. In this capacity, the user may be considered beneficial or harmless depending on the chemical used or for what purpose it will be used. The following are some things you should know about iron minerals oxidation.

1. Iron Oxide Minerals

The most common mineral that will contain iron is hematite (Fe2O3). Hematite contains pure iron and some copper but no other metals. Hematite has a red to black color. Hematite is found in many locations worldwide, such as in sideritic veins, fissures, beds, or nodules from igneous rocks or iron deposits. The oxidation of minerals that contain iron is mainly found as surface oxidation. In some oxidized materials, the silica becomes a hydrating product, and a combination of iron and silica forms the color called goethite.

2. Hematite is given to the earth by meteorites burning up in the atmosphere.

The goethite is a grayish color, a hydrated silicate of iron and hydroxyl ions. It is found in igneous rocks and sedimentary deposits worldwide, but it is most abundant in limestones and cherts, particularly limestones in sedimentary basins. During the oxidation , the iron minerals will change from hematite to goethite. Organic matter can be added to the limestone, which is why cave floors are found in sedimentary basins. In these cases, human bones, stone tools, and other evidence of prehistoric people living have been found.

3. Iron Oxide Chemistry

Iron oxide is an inorganic compound of iron and oxygen. The chemical formula for the oxidation of minerals that contain iron also includes copper and other elements. The will produce several different oxides, hydroxides, hematite, magnetite, and goethite. Oxygen formation begins when these materials are mixed in the environment with water. The oxidation of iron and the minerals  hydrates with different molecular compositions. On the molecular level, the structure is made up of sheets or layers of sheets of hydroxyl ions with iron ions so that it looks like a sandwich. Each layer of iron and oxygen atoms gives one molecule its color.

4. Iron Oxides Used in Industry

Iron Oxide and Iron Solubility. Iron oxides are used in paints and other industrial products for mixing pigments or coloring. Some uses are found in plastics, dyes, and food coloring agents. The oxidation is used in some camera filters. Magnetite is used in car brakes to form magnetic properties. Iron oxides are insoluble in water, but some iron hydroxides are soluble. Iron oxides are easily oxidized, forming many other minerals that contain iron, such as goethite or hematite. The main factor in the oxidation is the presence of moisture with high oxygen levels. The oxidation  takes place at a slower rate when there is less carbon dioxide in the air.

5. Iron Oxides have Good and Bad Properties

The oxidation is used in the paper industry to make papers that will not produce acid rain and to help brighten the yellow color that is sometimes found in old paper. Some materials use hematite for the production of cadmium red pigments. The production of cadmium red pigments by oxidizing hematite can be a harmful practice because of the toxicity of cadmium and other health hazards. During the oxidation , it can be toxic to the environment, and it will be a significant pollutant if the oxidation process is not stopped correctly. Also, this mineral can still be toxic if hematite is not completely oxidized to goethite and magnetite.

Conclusion

The oxidation of minerals that contain iron is a natural process that occurs in the environment. Layers of iron oxides are found in sandstone and other sedimentary rocks. The oxidation can produce many chemicals, giving it some positive uses, such as the production of paints and paper or as a colorant for dyes or food coloring agents. However, some of these chemicals have adverse effects on the environment, and they can be dangerous to the health of animals and humans when they are not correctly processed or manufactured.