The molecular formula of iron oxide red is Fe203, molecular weight is 159.69, there are two kinds of natural and artificial iron oxide red. Natural iron oxide red called west red, is basically pure iron oxide, melting point of 1565℃, relative density of 5.24. It exists in the form of hematite in nature, has amphotericin, has certain reducibility in strong alkali medium, and can be oxidized by strong oxidants. Ferric oxide does not dissolve in water and does not interact with water. Due to the different production methods and operating conditions, their crystal structures and physical properties are very different, and their color varies from orange to blue to violet light, and their hiding power and coloring power are very large. It has excellent light resistance, high temperature resistance, corrosion resistance and other properties, and is gradually dissolved only in the case of heating in concentrated acid. Application of iron oxide red pigment Iron oxide red pigment is used as preform in all kinds of concrete, as pigment or colorant in building materials, and can be directly applied in cement. Iron oxide red pigment can be used for a variety of indoor and outdoor colored concrete; All kinds of architectural ceramics and glazed ceramics such as tiles, floor tiles, house tiles, etc. At the same time, the iron oxide red pigment is suitable for the coloring of plastic products, widely used in construction, rubber, plastic, paint and other industries, especially the iron red primer has anti-rust function, can replace the high price of red paint to save non-ferrous metals, and is a high-level fine grinding material, suitable for the polishing of precision hardware instruments, optical glass and so on. High purity iron oxide red is the main base material of powder metallurgy, used to smelting various magnetic alloys and other advanced alloy steels. In addition, iron oxide red pigment can also be used for all kinds of cosmetics, paper, leather and other coloring. Application of iron oxide red in ceramic industry Iron oxide red pigment is mainly introduced in the form of colorant in the formulation of ceramic pigments. Such as glaze color materials in the brown series, black series; Iron oxide red raw material is also widely used in colored cement bricks such as ceramic glazed tiles. Therefore, the amount of iron oxide red pigment in ceramic pigments is large, and it is estimated that the amount of iron oxide red pigment is more than 10,000 tons per year. Application of iron oxide red in brown series products In ceramic glaze pigments, brown series products occupy a large market. Especially in the production of porcelain pieces and retro bricks, a large number of golden and red brown two series of products. Application of iron oxide red in glaze black material The cost of glaze black products is higher than that of other glaze colors, and the color of cobalt black products is the best in pure blues. The cost of bright black products is slightly lower than that of cobalt black because it does not contain cobalt oxide. But there are some brilliant black products on the market, and its pure black tone can be comparable to cobalt black. Iron oxide red pigment mainly plays the role of color aid in the glaze black material. At present, the iron red products sold on the market are mainly 110, 130, 190 and so on. Due to the different production processes adopted, products of the same specification also have great differences in performance. In this study, a comparative test of iron oxide red pigments from various manufacturers in raw antique glaze was carried out. The experimental results show that iron oxide red pigment with specification 130 is more suitable for the production of black glaze materials, and its blue value is better than that of 190 iron red. Summary Iron oxide red pigment is usually introduced in the form of colorant, which directly affects the quality of the product. It is very important to choose the appropriate iron oxide red product for the production of ceramic pigments. In the brown series of products should choose the appearance of bright red yellow iron red products, and in the glaze with black products, should choose the appearance of bright and dark purple iron red products. Especially in the formula design of zirconium red glaze and coral red raw material, iron oxide red products produced by nitric acid method must be selected.