Calcium metaborate
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Calcium metaborate
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CAS No:
13701-64-9
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Formula:
BHO2.1/2Ca
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Chemical Name:
Calcium metaborate
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Synonyms:
Boric acid (HBO2),calcium salt (2:1);Boric acid (HBO2),calcium salt;Calcium borate (Ca(BO2)2);Calcium metaborate;Calcium metaborate (Ca(BO2)2);Calcium borate (CaB2O4);Calcium metaborate (CaB2O4);Emadox D 520;Calcium borate (Ca0.5(BO2));Calcium hypoborate (CaB2O4);Butrol 9119;Butrol 9102;Butrol 9103;27676-48-8;206185-77-5;220986-52-7;350602-69-6;358718-21-5;950582-67-9;1356962-03-2
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CAS No:
Safety Information
NONH for all modes of transport
36/37/38
26
Xi
P261-P305 + P351 + P338
H315-H319-H335
Calcium metaborate Use and Manufacturing
In the boric acid lime milk method, a lime milk containing about 10% CaO is prepared by digesting quicklime, and then metered into the synthesizer. The boric acid-containing solution obtained during the preparation of boric acid from the sodium polyborate method is added under stirring, and the control material B2O3/CaO is 0.9 ～1, react at 40～65℃. The formed calcium metaborate precipitate is filtered, washed, dried and pulverized to obtain a finished product of calcium metaborate. 2H3BO3+Ca(OH)2→CaO·B2O3·4H2O Ammonium hydrolysis filtrate of ammonium borate lime milk method carbon ammonia method boric acid is used to remove the remaining ammonium bicarbonate with compressed air under proper heating, and then sent to the synthesizer. Add the lime milk from the digester and stir the reaction. During the reaction, the ratio of boron to calcium (B2O3/CaO) was controlled at 0.9～1.1, the temperature was 60～65℃, and the reaction time was about 22 h. After the generated calcium metaborate precipitate is filtered, dried and crushed, a finished product of calcium metaborate is obtained. 2MgO·B2O3+2NH4HCO3+H2O→2NH4H2BO3+2MgCO32NH4H2BO3+Ca(OH)2→CaO·B2O3·4H2O+2NH3↑ Borax-lime milk method Add borax to a reactor containing water, and add digested lime under stirring For milk, control the boron-calcium ratio (B2O3/CaO) at 0.9-1 during the reaction, and react at 40-65°C to form calcium metaborate precipitate, which is filtered and dried to obtain calcium metaborate product.
It is a new raw material in the alkali-free glass industry, and is also used in anti-rust coatings, flame retardants, mildew inhibitors and the pharmaceutical industry.
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