Name | CALCIUM BORATE |
Synonyms | colemanite CALCIUM BORATE Boroncalciumoxide CALCIUM PYROBORATE CALCIUM TETRABORATE boroncalciumoxide(b4cao7) boric acid (h2-b4-o7), calcium salt |
CAS | 12007-56-6 |
EINECS | 234-511-7 |
Molecular Formula | BCaH7O |
Molar Mass | 73.94 |
Density | 1.904[at 20℃] |
Water Solubility | soluble H2O, acids; evolves oxygen [HAW93] |
EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
Overview | calcium tetraborate can be hydrolyzed to diborate by a large amount of water. Calcium tetraborate is obtained by co-melting a mixture of calcium oxide and excess boric acid with sodium chloride and potassium chloride. |
Application | calcium tetraborate is used as melting agent, preservative, astringent and fire paint for heavy metal smelting. It can be used for to prepare a kind of wire harness for steam and electrical components with strong comprehensive performance, as well as a low through-hole coating for steel corrosion prevention and a moisture-proof and bacteriostatic sheath material for wire harness. |
production method | 1. Multi-sodium borate calcium lime method: under a certain sodium carbonate, the magnesium borate is decomposed under the pressure of carbon dioxide, and the carbon decomposition solution of boron residue is separated mainly in the form of multi-sodium borate, this filtrate is used to react with milk of lime to produce a control material B 2 O 3 /CO of 0.9-1, and the reaction is carried out at 40-65 ℃. The resulting calcium metaborate precipitate is filtered, washed, dried and pulverized to obtain a calcium metaborate product. Its reaction formula is as follows:????????????????????????? 2H 3 BO 3 + Ca(OH) 2 → Ca O. B 2 O 3 .4H 2 O 2. Ammonium borate milk of lime method: the ammonolysis filtrate of boric acid in the carbonamide method is removed from the remaining ammonium bicarbonate with compressed air under appropriate heating and then fed to the synthesizer. Milk of lime from the digester was added and the reaction was stirred. The ratio of boron to calcium (B 2 O 3 /CO) was controlled at 0.9~1.1, the temperature was 60~65 ℃, and the reaction time was about 22H. The resulting calcium metaborate precipitate is filtered, dried and pulverized to obtain a finished product: 2mg O. B 2 O 3 + 2NH 4 HCO 3 + H 2 O → 2NH 4 HBO 3 + 2MgCO 3 2NH 4 HBO 3 + Ca(OH) 2 → Ca O. B 2 O 3 .4H 2 O + NH 3 3. One-Step calcium borate: pressurized decomposition of boron magnesium ore with carbon dioxide, the carbon solution of boron slag is mainly in the form of boric acid, and the filtrate is used under the action of a certain activator, with about 10% of the milk of lime neutralization reaction, the formation of calcium borate, after separation, drying, that is calcium borate. |
category | toxic substances |
toxicity grade | low toxicity |
Acute toxicity | oral-rat LD50: 5600 mg/kg; Oral-mouse LD50: 5900 mg/kg |
storage and transportation characteristics | low temperature ventilation and drying |
fire extinguishing agent | water, carbon dioxide, foam, dry powder |