Hebei Messi Biology Co., Ltd. stated that in the preparation process of medical heavy magnesium carbonate, there are many main factors that affect the magnesium oxide content, bulk density and other indicators of the product. Method: Soda ash and bittern are used as raw materials, and medical heavy magnesium carbonate is obtained by pyrolysis, separation and drying after double decomposition reaction. Results: The concentration of reactants, reaction temperature and reaction time directly affect the quality of the product. Conclusion: The production process for preparing medical heavy magnesium carbonate should control the concentration of reactants to (20-25) g*L-1Mg2+, (88-11) g*L-1NaCO3; the reaction temperature is double decomposition reaction at room temperature, and the pyrolysis temperature is controlled at about 90℃; the reaction time is 3-4h; the drying temperature is about 100℃.
Hebei Messi Biology Co., Ltd. is a well-known domestic manufacturer of pharmaceutical and food grade magnesium carbonate. The annual output of pharmaceutical and food grade magnesium carbonate is over a thousand tons. Relying on the hydromagnesite resources in Tibet, Messi Biology adopts the double decomposition method to produce, remove impurities twice, and calcine at a high temperature of over a thousand degrees. The pharmaceutical and food grade magnesium carbonate products produced are then crushed, mixed, and aseptically treated in a 300,000-level purification workshop before packaging and storage. The product contains low or even no heavy metals such as lead, arsenic, chromium, and mercury, hydrochloric acid insolubles, sulfates, chlorides and other toxic and harmful substances. The purity is high, reaching more than 99%. It has reached EU standards and is far superior to the national pharmacopoeia standards. The product can effectively avoid accidents of unqualified finished products caused by raw material quality.