Basic magnesium carbonate and preparation method thereof

The invention discloses a method for preparing basic magnesium carbonate. The method comprises the following steps: dissolving a soluble magnesium salt or a hydrate thereof in water, adding an organic solvent to obtain a magnesium salt solution, introducing carbon dioxide to the obtained magnesium salt solution, heating the carbon dioxide introduced magnesium salt solution to obtain a solid and liquid mixture, and separating the solid and liquid mixture to obtain a solid which is basic magnesium carbonate. Highly pure carbon dioxide is introduced to a reaction system as a carburization agent, so the reaction temperature is low, and introduction of various impurity elements is reduced, thereby the purity of basic magnesium carbonate is improved. Morphology-(flower shape and carpenterworm shape)-and-crystallinity-controllable highly-pure basic magnesium carbonate powder is prepared through controlling the following reaction conditions: temperature, time, and addition of anhydrous ethanol. 本发明公开了种制备碱式碳酸镁的方法，包括：可