Hebei Messi Biology Co., Ltd. stated that in industrial production, there are usually four methods for producing light magnesium carbonate due to different raw materials:
The first is the dolomite carbonization method, that is, dolomite ore or magnesite is calcined together with coal, and the clinker obtained after calcination is sent to the digester to digest with waste magnesium water into a certain concentration of ash emulsion, and the ash emulsion is separated and deslagging and sent to the carbonization tower to react with the carbon dioxide in the kiln gas from the calcining kiln after washing and pressurization. The carbonized slurry after carbonization is qualified is separated and filtered to obtain the filter residue and the clear filtrate, that is, the magnesium water clear liquid. The heavy magnesium water clear liquid is pyrolyzed into a basic magnesium carbonate precipitate, which is separated and dehydrated, dried, and crushed to obtain the finished product.
The second is the halogenation carbonization method, that is, bittern is used as raw material, and carbon dioxide, dolomite ash or lime produced after calcining dolomite or limestone is used as raw material, and digestion, precipitation, carbonization, pyrolysis and other reactions are carried out to obtain light magnesium carbonate.
The third is the brine soda method, which is to dilute the bittern and add soda ash liquid, and then obtain the finished light magnesium carbonate product through filtering, washing, crushing, drying, pulverizing, air separation, packaging and other processes.
The fourth is the brine bicarbonate method, which removes impurities from the bittern and mixes it with ammonium bicarbonate in an appropriate proportion, performs precipitation reaction, and then centrifuges to dehydrate, dry and pulverize to obtain light magnesium carbonate. At the same time, there is a small amount of sodium chloride and ammonium chloride in the mother liquor. Sodium chloride can be separated after filtration, and ammonium chloride can be recovered by crystallization after evaporation and cooling.