Meishen Technology Company
Method 1:
magnesite (MgCO3) was mixed with coke and roasted to obtain magnesium oxide.
After water was added to form mud, CO2 was passed into magnesium bicarbonate.
After filtration, the filtrate was heated to obtain basic carbonate
precipitation.
Method
2: The dolomite is heated with a small fire, only the magnesium carbonate is
decomposed and crushed, and the magnesium oxide is changed into magnesium
bicarbonate and dissolved by interaction with water and CO2 under 5 ~ 6
atmospheres, and the remaining calcium carbonate is obtained by filtration and
heating.
Method
3: The same amount of crystalline magnesium sulfate and crystalline sodium
carbonate were dissolved in 10 times of water respectively, and heated to 60 ? ~ 80 ? for full mixing. When CO2
gas was produced, precipitation was produced. The precipitate is filtered out,
mixed with hot water at 70 ?
~ 80 ?,
filtered again, precipitated, thoroughly washed and dried at 50 ? ~ 60 ?.
Method
4: Preparation from brine after making salt. In the brine, sulfuric acid is
added, hydrogen is added, bromine is removed by heating, then sodium carbonate
is added, stirring, and the reaction is made. At this time, basic magnesium
carbonate precipitation is generated, filtered, washed with water, and then
dried at above 50?,
precipitated magnesium carbonate (heavy magnesium carbonate) can be produced.