The chemical composition of hematite is Fe2O3, and the crystal is an oxide mineral of trigonal crystal system. It is polymorphic with magnehematite of equiaaxial system. The crystals are often plate-like; It is usually lamellar, scaly, oolitic, blocky or earthy. It is red brown, steel gray to iron black and other colors, and the streaks are cherry red. Metallic to semi-metallic luster. Morse hardness 5.5 ~ 6.5, specific gravity 4.9 ~ 5.3. The hematite with iron black, metallic luster and flake is called boundary iron ore. Steel-gray, metallic luster, scaly called mica hematite, ancient Chinese called "Yunzi iron"; Reddish brown earth and dull luster called ochre, ancient Chinese called "ochre", and "ochre" generally refers to hematite.

Main use
1, in the building materials industry is mainly used in colored cement, colored cement tiles, colored cement tiles, imitation glazed tiles, concrete tiles, colored mortar, colored asphalt, terrazzo, Mosaic tiles, artificial marble and wall painting;
2, used for a variety of paint coloring and protection substances, including water-based interior and exterior wall coatings, powder coatings, etc. It can also be applied to oil-based paints including epoxy, alkyd, amino and other primers and topcoats; It can also be used in toy paint, decorative paint, furniture paint, electrophoresis paint and enamel paint. Iron red primer has anti-rust function, can replace high-priced red lead paint, save non-ferrous metals.
3, for the coloring of plastic products, such as thermosetting plastics and thermoplastics, and rubber products, such as automotive inner tubes, aircraft inner tubes, bicycle inner tubes, etc.
4, for advanced fine grinding materials, used in precision hardware instruments, optical glass and other polishing. High purity is the main base material of powder metallurgy, which is used to smelt various magnetic alloys and other high-grade alloy steels. Made from ferrous sulfate or iron oxide yellow or foot iron mixed by high temperature calcination, or directly from the liquid medium