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
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
WGK Germany N/A
Packaging Group N/A
Hazard Class N/A


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.