The calcination temperature has a certain influence on the activity of magnesia. The calcination temperature, temperature rise rate and residence time of carbonate rock have important effects on its continuous decomposition. When the temperature is 700 °C, the maximum conversion rate reaches the maximum value, and the residence rate is related to the surface area of ​​magnesium oxide. In the range of 900-1000 ℃, with the increase of temperature, calcined basic magnesium carbonate produces Magnesium Oxide MgO with low activity.

Activity is not only an important physical property of Magnesium Oxide MgO, but also an important indicator of magnesium oxide in the rubber industry. In other words, the heavy is only MgO, and the light is only xMgO. yMg(OH)2, which is basic magnesium oxide. The content of light magnesium oxide is one of the important factors affecting the activity.

Generally speaking, high-activity Magnesium Oxide MgO is decomposed at low temperature for a long time, and it is made of basic magnesium carbonate. In addition, a high-activity magnesium oxide with a higher iodine absorption value than 170 mgI2/g MgO was prepared from light magnesium oxide by microwave irradiation. This product has a small apparent specific volume in the range of 2.5-3.3 ml/g.

It is mainly used as an activator and accelerator for butyl rubber, neoprene, fluororubber, and nitrile rubber, and can also be used as the main auxiliaries for coatings, adhesives, plastics, etc. With the development of science and technology and economy, the application of activated Magnesium Oxide MgO is becoming more and more extensive, and its dosage is increasing day by day, and the requirements for product activity are getting higher and higher.