CALCIUM METABORATE
diboron calcium tetraoxide
CAS: 13701-64-9
Molecular Formula: B2Ca3O6
CALCIUM METABORATE - Names and Identifiers
| Name | diboron calcium tetraoxide |
| Synonyms | CALCIUM BORATE CALCIUM-M-BORATE CALCIUM METABORATE CALCIUM BORATE HYDRATE diboron calcium tetraoxide boranolate, oxo-, calcium salt Boric acid (HBO2), calcium salt |
| CAS | 13701-64-9 |
| EINECS | 237-224-5 |
| InChI | InChI=1/2BO2.Ca/c2*2-1-3;/q2*-1;+2 |
CALCIUM METABORATE - Physico-chemical Properties
| Molecular Formula | B2Ca3O6 |
| Molar Mass | 237.85 |
| Density | 2[at 20℃] |
| Melting Point | 986 (anhydrous) [CRC10] |
| Water Solubility | g/100g H2O: 2.32 (0°C), 2.72 (20°C), 8.70 (100°C) [LAN05] |
| Appearance | White powder |
| Color | White |
| Exposure Limit | ACGIH: TWA 2 mg/m3; STEL 6 mg/m3 |
| Storage Condition | Room Temprature |
| MDL | MFCD00049397 |
| Physical and Chemical Properties | White crystals. There are three kinds of hydrate, namely CaO · B2O3 · 6H2O, CaO · B2O3 · 4H2O and CaO · B2O3 · 2H2O. When heated, The hexahydrate is dewatered and converted to a tetrahydrate by losing 2 molecules of water at 101-120 °c and to a dihydrate at 300 °c. Calcium metaborate tetrahydrate has a Ca[B(OH)4]2 structure. Soluble in water, dilute acid, aqueous solution as alkali parts. |
CALCIUM METABORATE - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | 26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. |
| WGK Germany | 3 |
| TSCA | Yes |
CALCIUM METABORATE - Nature
Open Data Verified Data
three kinds of calcium borate are mainly calcium diborate (Ca0-4H2 0) and calcium hexaborate (2 Ca0 · 382 3.6h2 O), and it is customary to make B2 03 in 32% ~ 35%.Ca0 greater than 30% is called calcium metaborate; And B2 03 greater than 40%, Ca0 in 25% ~ 30% is called calcium borate, calcium borate is white crystal or powder, slightly soluble in water, can be Acid Decomposition of free boric acid, can also be in the alkali aqueous solution reaction, production of borax or partial borate (mainly depends on the alkalinity of the solution).
Last Update：2024-01-02 23:10:35
CALCIUM METABORATE - Preparation Method
Open Data Verified Data
- sodium polyborate-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 separated is mainly in the form of sodium polyborate, using this filtrate to react with milk of lime to produce a control material B2 03/Cao of 0.9 to 1, the reaction is carried out at 40 to 65 °c. The resulting calcium metaborate precipitate is filtered, washed, dried and pulverized to obtain a calcium metaborate product.
- 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 (B2 03/Ca0) 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 calcium metaborate product.
- 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.
Last Update：2022-01-01 10:58:46
CALCIUM METABORATE - Application
Open Data Verified Data
is a new raw material for non-alkali glass industry, also used in anti-rust coatings, flame retardants, fungicides and pharmaceutical industry.
Last Update：2025-08-19 16:24:40
CALCIUM METABORATE - Safety
Open Data Verified Data
packed in a woven bag lined with a polyethylene plastic bag. The net weight of each bag is 50 kg. Should be stored in a dry warehouse. To prevent moisture. The packaging is sealed. Should be protected against rain and rain during transport. Do not store and mix with acids. When loading and unloading should be light to prevent packaging damage.
Last Update：2025-06-10 22:55:16
CALCIUM METABORATE - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| use | is a new raw material for alkali-free glass industry, and is also used in antirust coatings, flame retardants, antifungal agents and pharmaceutical industry. |
| production method | lime milk with boric acid is digested with quicklime to obtain lime milk containing about 10 O, which is measured and put into a synthesizer. boric acid solution obtained in the process of boric acid taking from sodium polyborate method is added under stirring. B2O3/CaO is controlled to be 0.9~1, and the reaction is carried out at 40~65 ℃. The resulting calcium metaborate precipitate is filtered, washed, dried, and crushed to produce a finished calcium metaborate product. Its 2H3BO3 Ca(OH)2 → CaO · B2O3 · 4H2O ammonium borate lime emulsion method carboammonia method boric acid ammonolysis filter solution is used to remove the remaining ammonium bicarbonate with compressed air under appropriate heating, and then sent to the synthesizer. Add the lime milk from the digester and stir for the reaction. During the reaction, the boron-calcium ratio (B2O3/CaO) was controlled at 0.9~1.1, the temperature was 60~65 ℃, and the reaction time was about 22 h. The resulting calcium metaborate precipitate is filtered, dried, and crushed to produce a finished calcium metaborate product. Its 2MgO · B2O3 2NH4HCO3 H2O → 2NH4H2BO3 2MgCO32NH4H2BO3 Ca(OH)2 → CaO · B2O3 · 4H2O 2NH3 ↑ Borax lime emulsion method adds borax to a reactor filled with water, adds digested lime milk under stirring, controls the boron-calcium ratio (B2O3/CaO) at 0.9~1 during the reaction, and reacts at 40~65 ℃ to generate calcium metaborate precipitate, which is filtered and dried, made calcium metaborate products. |
Last Update：2024-04-09 21:54:55
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