Hebei Messi Biology Co., Ltd. stated that as an important inorganic chemical product, basic magnesium carbonate can be used as a raw material for the preparation of high-purity magnesium sand, magnesium salt and other series of products, as well as an additive and improver for chemical products such as rubber, medicine, and insulating materials, and has a very broad application prospect. However, the realization of these potential applications is closely related to factors such as the purity, morphology and degree of crystallization of basic magnesium carbonate. For example, when basic magnesium carbonate is used as a high-purity magnesium oxide material, the content of calcium oxide and boron oxide is one of the important indicators for evaluating the quality of the product. For electronic-grade basic magnesium carbonate, it is required not only to have a high purity, but also to have special physical properties.
Up to now, there are many methods for preparing basic magnesium carbonate, such as: dolomite calcination-digestion-carbonization method, magnesia powder-acid hydrolysis-carbonization method, brine-soda ash method, brine-carbon ammonium method, magnesium hydroxide-carbonization method, and magnesia double decomposition method. The main process of the brine-soda method is to pre-treat bittern and sodium carbonate solution, then perform precipitation reaction, filter washing, dehydration, drying, crushing and other processes to produce medicinal magnesium carbonate. The main process of the magnesia double decomposition method is to use ammonium sulfate solution and magnesia to perform double decomposition reaction to generate magnesium sulfate solution, and then use the recovered ammonia to prepare carbonized ammonia water, and precipitate basic magnesium carbonate with magnesium sulfate solution, and then filter washing, dehydration, drying, crushing and other processes to produce medicinal magnesium carbonate. The traditional process of producing basic magnesium carbonate is complex, energy-intensive, and impurities are difficult to remove.