What Is Hydroxyapatite?
Apatite refers to a phosphorus-containing ore in which crystalline apatite exists in igneous and metamorphic rocks. Is a general term for a series of calcium-containing phosphate minerals. Apatite is the most important mineral raw material for the manufacture of phosphate fertilizers and phosphorus and their compounds. The most common apatite is fluoroapatite. According to different anions, in addition to fluoroapatite, there are chloroapatite and hydroxyapatite. The shape of apatite is glass-like crystals, blocks or nodules, and the colors are various. Most of them are hexagonal cylinders with tapered surfaces. Apatite is found in various igneous rocks as a secondary mineral. Industrial ore deposits can be formed in alkaline igneous rocks, such as the Hibernian Apatite-Chalite Mine in the Kola Peninsula, Russia. The huge apatite deposits are mainly shallow sea sedimentary rocks, mainly colloidal phosphate rock. Such as Xiangyang, Hubei, Kunyang, Yunnan, and Kaiyang phosphate mines in Guizhou. They can also form sedimentary metamorphic deposits. Seabird dung phosphate rock formed by biochemical action, the main component is hydroxyapatite. [1]
- Apatite is light green, yellow green, maroon and other colors, and glass luster. With incomplete cleavage, the fracture is uneven. The fracture is shell-shaped, has a luster of grease, and many types of apatite have fluorescence. A variety of apatites usually contain impurities such as
- Apatite can be generated in three ways,
- Apatite is used for extracting phosphorus and manufacturing agriculture
- Apatite is found in various minerals as a side mineral
Apatite hydroxyapatite
- English name: Hydroxyapatite
- Molecular formula: Ca 10 (PO 4 ) 6 (OH) 2
- Molecular weight: 1004
- Physical and chemical properties: melting point: 1650 ° C, specific gravity: 3.16g / cm, solubility: 0.4ppm, Ca / P: 1.67
- Crystal Structure: Hexagonal
- Product specifications: powder, porous particles, block (non-calibrated) products
- Application areas: bone replacement materials, plastic and cosmetic surgery, dental, chromatography purification, calcium supplements
- Preparation method: Ca (PO 4 ) 2 and CaCO 3 can be reacted at high temperature and injected with high-pressure steam at the same time. The powder is washed with NH 4 Cl aqueous solution and dried. The material is sintered at 1250 ° C after foaming, and the latter is sintered at 1250 ° C after molding.
- Distribution: It is widely found in human body and milk. The human body is mainly distributed in bones and teeth. The milk is mainly distributed in casein colloidal particles and whey.
Apatite Fluorapatite
- Fluorapatite is a common calcium fluorophosphate mineral. It is found in almost all igneous rocks and magnesium ore. Fluorapatite has glass luster and many colors, but mostly green. Generally columnar or thick plate-like crystals, coarse grains to dense blocks or nodules.
- The apatite is ground into a phosphate rock powder and used directly as an acid soil fertilizer. The fineness of ore powder is generally required to be more than 90% for 100 mesh, and the ore needs to contain 10% to 20% of P 2 O 5. There are no special requirements for other impurities. [4]