Magnesium carbonate
Specifications
| Item | Index | Index | Index |
| A.R. | C.P. | USP31 | |
| Assay(MgO) % | 40.0~44.5 | 40.0~44.5 | 40.0~45 |
| HclInsol. in water % | ≤0.025 | ≤0.05 | ≤0.05 |
| Chlorides(CL) % | ≤0.01 | ≤0.1 | ≤0.07 |
| Nitrates(NO3)% | ≤0.005 | ≤0.01 | —— |
| Phosphate(PO4)% | ≤0.001 | ≤0.05 | —— |
| Sulfur compound (SO4)% | ≤0.02 | ≤0.08 | —— |
| Ba % | ≤0.01 | ≤0.05 | —— |
| Ca % | ≤0.15 | ≤0.25 | ≤0.25 |
| Fe % | ≤0.005 | ≤0.01 | ≤0.02 |
| Sol. in water % | ≤0.4 | ≤0.5 | ≤1.0 |
| Carbonates basic % | Pass | Pass | —— |
| Heav metal(Pb)％ | ≤0.002 | ≤0.005 | ≤0.002 |
| Zn% | ≤0.01 | ≤0.02 | —— |
| As% | —— | —— | ≤0.0002 |
Packing& Storage
| Packing | 25kg cardboard drum, lined with double-layer plastic bag | |||||||
| Storage | 20℃, 2 years. | |||||||
| Shipping | Room temperature in China; may vary elsewhere | |||||||
General Information
1.1 Chemical & Physical Properties
| Common Names | Magnesite | MgCO3 | ||||||
| Structure |  |
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| CAS No. | 13717-00-5 | Boiling Point (℃) | 76°C 0,09mm | ||||
| Molecular Weight | 84.314 | Melting Point (℃) | 2200℃ | ||||
| Appearance | White granular powder | Vapor Specific Gravity | N/A | ||||
| HS Code | 2836991000 | Flash Point (℃) | 110 °C | ||||
| Solubility | Insoluble in water or ethanol | Autoignition Temperature (℃) | N/A | ||||
1.2 Safety Information
| Safety Phrases | S26-S36/37/39 | |
| RIDADR | N/A | |
| WGK Germany | N/A | |
| Packaging Group | N/A | |
| Hazard Class | N/A | |
| SYMPTOMS | PREVENTION | FIRST AID | |
| Inhalation | Cough. Sore throat. | Use local exhaust or breathing protection. | Fresh air, rest. |
| Skin | Redness. Burning sensation. Itching. | Protective gloves. | Remove contaminated clothes. Rinse and then wash skin with water and soap. |
| Eyes | Redness. Pain. | Wear safety goggles. | First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. |
| Ingestion | Abdominal pain. Nausea. Vomiting. | Do not eat, drink, or smoke during work. Wash hands before eating. | Rinse mouth. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Refer for medical attention . |
1.3 Synthetic Route
1. Magnesium oxide is obtained by mixing magnesite (MgCO3) with coke and roasting. After adding water to form a sludge, CO2 is introduced to obtain magnesium bicarbonate, and after filtration, the filtrate is heated to obtain basic carbonate precipitation.
2. Heat dolomite over low heat (MgCO3· CaCO3), only make magnesium carbonate decompose and crush, under 0.508 ~ 0.609MPa to make it react with water and carbon dioxide, then magnesium oxide becomes magnesium bicarbonate and dissolves, at this time the remaining calcium carbonate, filtered and heated.
3. Dissolve the same amount of crystalline magnesium sulfate and crystalline sodium carbonate in 10 times the amount of water, heat to 60~80 °C and mix thoroughly, and produce precipitation while generating CO2 gas. Filter out the precipitate, mix with 70~80 °C hot water, and then filter. Repeat this washing process, and the precipitate is fully washed and dried at 50~60 °C.