Tricalciumbis(orthophosphat) Chemische Eigenschaften,Einsatz,Produktion Methoden
R-Sätze Betriebsanweisung:
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
S24/25:Berührung mit den Augen und der Haut vermeiden.
S22:Staub nicht einatmen.
Beschreibung
Calcium Phosphate is the calcium salt of phosphoric acid with widely used applications. It occur abundantly in nature in several forms and are the principal minerals for the production of phosphate fertilizers and for a range of phosphorus compounds. For example, the tribasic variety (precipitated calcium phosphate), Ca3(PO4)2, is the principal inorganic constituent of bone ash. The acid salt Ca(H2PO4)2, produced by treating mineral phosphates with sulfuric acid, is employed as a plant food and stabilizer for plastics. It is a natural constituent of mammals, and it is a component of bone replacement transplants in much higher amounts with no toxicological problems.
Calcium phosphates are the largest group of artificial bone graft substitutes. This is mainly due to their close resemblance to the mineral components of bone. This Product can be used as a countermeasure for exposure to strontium and radium radionuclides. Upon oral uptake, calcium phosphate competes for and blocks the absorption of radium (Ra-226) and strontium (Sr-90) in the gastrointestinal (GI) tract.
Chemische Eigenschaften
Calcium phosphate, also known as tricalcium phosphate, is a white or almost white powder that is insoluble in water. It reacts with silicon oxide and carbon at electric furnace temperatures to yield phosphorus vapor. When reacted with sulfuric acid (H₂SO₄), it forms different products depending on the proportions used: phosphoric acid, dicalcium hydrogen phosphate (CaHPO₄, a white insoluble solid), or calcium dihydrogen phosphate (Ca(H₂PO₄)₂·H₂O, a white soluble solid). Its solubility product constant (Ksp) is 28.70.
Physikalische Eigenschaften
White amorphous powder; refractive index 1.63; density 3.14 g/cm
3; melts at 1,670°C; insoluble in water; KSP 1.0x10
-25; soluble in acids.
Occurrence
Tribasic calcium phosphate occurs in nature as minerals, such as oxyapatite, whitlockite, voelicherite, apatite, and phosphorite. It has many industrial applications, some of which are similar to those of the monobasic and dibasic salts. It is used in fertilizers, dental products, ceramics, and polishing powder.
Other important applications include its use: As a stabilizer in plastics; As an anticaking agent; As a nutrient supplement in cattle feed; For clarifying sugar syrup; As a mordant in dyeing textiles; And as a buffer to control pH.
synthetische
Tribasic calcium phosphate is obtained from naturally occurring minerals for fertilizer applications. The compound may be prepared in the laboratory by the reaction of sodium phosphate with calcium chloride with excess of ammonia. Also, it can be prepared by treatment of calcium hydroxide with phosphoric acid:
2H3PO4 + 3Ca(OH)2 → Ca3(PO4)2 + 6H2O
Allgemeine Beschreibung
β-tri-Calcium phosphate belongs to the category of calcium-phosphate based ceramics, which has been involved in the preparation of a new biosynthetic material possessing morphogenetic activity that is used as a bone implant.
Industrielle Verwendung
Calcium phosphate [Ca
3(PO
4)
2] finds applications as a supplement for animal feed, as a fertiliser, in the manufacture of glass and in dental products.
Tricalciumbis(orthophosphat) Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
