Hebei Messi Biology Co., Ltd. stated that both active magnesium oxide and high-purity magnesium oxide are members of the magnesium oxide family, and the “activity” of both refers to a very high specific surface area, that is, the unit mass of the substance has a large total surface area, figuratively speaking, it is extremely loose and porous, with strong adsorption capacity and high chemical reaction activity. This is the connection between the two. At the same time, as two members of magnesium oxide, they are not only different in name, but also have essential differences in preparation process, chemical properties and application fields.
High-purity magnesium oxide means that the content of magnesium oxide in the reagent reaches a higher standard, while active magnesium oxide means that it has a very high specific surface area, strong adsorption and chemical reaction activity. These are two different definitions.
High-purity magnesium oxide is generally magnesium oxide with very high purity. Its preparation process generally includes a gas phase method, that is, high-purity metal magnesium and oxygen react to form crystal nuclei, and then the particles continue to grow to obtain high-purity micro-powder magnesium oxide. The raw material containing more than 80% of magnesium oxide is dissolved in an inorganic acid (sulfuric acid, hydrochloric acid, nitric acid) at a molar ratio of 1:2 to produce a magnesium salt of an inorganic acid. After refining to remove impurities, it is subjected to pressure heating treatment in an oxygen atmosphere, then washed, dehydrated, dried, and heated at 1100°C for 1 hour to obtain high-purity magnesium oxide. High-purity magnesium oxide is mainly used in the reagent industry and other chemical or intermediate products.
The main method for preparing active magnesium oxide is to calcine magnesite in a gas reverberatory kiln, control the calcination technology, process, coal used, and production equipment, so that the temperature is controlled within the range of producing active magnesium oxide. The internal structure of the ore is loose, and the pores between the crystals are the highest, so that the generated magnesium oxide has the required activity. Active magnesium oxide is a new type of high-functional fine inorganic material in the application field. It is generally an aggregate of nanoparticles with a particle size between 1000-2000nm and an iodine absorption value of about 80-180. Due to its fine particles, it has special functions such as heat, light, electricity, mechanics and chemistry that are different from the main material.