Messi Biology Explains the Active Formation Mechanism of Magnesium Oxide
1. Activated magnesia is magnesia with hydration ability, expressed in hydration rate, iodine absorption value, citric acid value, specific surface area and so on.
2. The formation of active magnesium oxide. During the calcination process of magnesite ore in the kiln, due to technical and other reasons, the temperature of magnesite calcination is different. When the temperature reaches 400-600 ℃, its internal structure is loose, the pores between crystals are the highest, and magnesium oxide exhibits the highest activity.
3. When the calcination temperature reaches 750-850°C, the porosity between crystals decreases, reaching the optimum range of magnesium cement reaction, and the activity is moderate. When the calcination temperature is higher than 900-1000°C, overfired magnesium oxide is formed, and its activity is very low or even inactive. Within a certain range of activity, those with high activity have good product quality, and those with low activity have poor product quality, but this is not the case for underfired magnesium oxide. The higher its activity, the more intense the reaction, the more concentrated the heat release of magnesium chloride, and the worse the product quality. Easy to crack and low strength.