Magnesium oxide heavy, Molecular formula MgO, Relative molecular mass 40.30. White or beige powder, non-toxic, odorless, tasteless. The relative density is 3.58, the melting point is 2800 ° C. Hard to dissolve in water and organic solvents, soluble in acid or ammonium salt solution. Easy to absorb moisture, forming magnesium double salt in the air and carbon dioxide.
Industrial heavy magnesium oxide in the magnetic materials industry, used for color TV deflection coils (ferrite soft magnetic) and other ferrite magnetic materials, Steel ball polishing industry as a polishing agent, in the electrical industry which is the raw material for phenolic resin (commonly known as bakelite), in the dye industry which is an auxiliary material for the production of aminophenol. It is also used in feed, glass, ceramics, industrial catalysts, and environmental protection industries. In the leather industry, the modification of heavy magnesium oxide can be used as a safe alkalinizer.
Three heavy magnesium oxide modified as a solution for extracting alkali:
1.High temperature burning of magnesium oxide, changing its crystal form and increasing its bulk density.
2.Modification of its mixed complex to reduce the acid center of the surface.
3.Polymer film coating modification. That is, the magnesium oxide particles are coated with an organic film, and the membrane structure is destroyed by the mechanical action of tanning, so that the magnesium oxide is slowly released, and the reaction speed with the acid is slowed down, and the pH value of the sputum is slowly increased. The results show that the sample prepared by film-forming coating of polymer material has uniform action of extracting alkali, so that the pH value of the mash can not be abruptly changed, and it is stable within a certain range. The sample is added to control the pH value. When it is raised, it can obtain a flat, full-bodied blue leather, and the absorption of the chromium liquid is good.