Zehui Lecture Hall: Take you to understand the active magnesium oxide

Friends familiar with magnesium oxide know that magnesium oxide is a very wide range of chemical raw materials, sometimes we often talk about active magnesium oxide, there are many people still unclear, can also be understood as heavy is magnesium oxide, and lightweight is basic magnesium oxide, lightweight magnesium oxide content plays an important role in activity.

　　In general, highly active magnesium oxide is prepared by decomposing basic magnesium carbonate for a long time at low temperatures, with special furnace structure, high energy consumption, and the apparent specific capacity of the prepared products is also large. In addition, there are also microwave radiation methods to prepare highly active magnesium oxide with a iodine absorption value higher than 170 mgI2/gMgO by means of lightweight magnesium oxide. The apparent specific capacity of this highly active magnesium oxide is relatively small, 2.5-3.3 ml /g. Active magnesium oxide is mainly used for butyl rubber, neoprene rubber, fluorine rubber, nitrile rubber activator and accelerator, but also one of the main additives for paints, adhesives, plastics and other products. With the development of science and technology and economy, active magnesium oxide has been more and more widely used, and the dosage is increasing day by day, and the requirements for product activity are becoming more and more diversified.

　　There are many methods for domestic production of magnesium oxide, such as seawater- lime method, brine - soda ash method, brine - carbon ammonia method, dolomite, magnesite - carbonization method and so on. No matter which production method is used, the activity of magnesium oxide is related to the production process, and there are many influencing factors of activity, such as internal defects in the lattice, specific surface area, production methods and other factors. Taking the brine-soda ash method as an example, the activity of magnesium oxide has a great relationship with the reaction temperature, pyrolysis temperature, reaction concentration (soda ash, brine), pressure, water quantity control, and dehydration time after pyrolysis. Studies have shown that calcination temperature has an impact on the activity of magnesium oxide, calcination temperature, temperature rise rate, residence time on the carbonate continuous decomposition has a great impact, at 700 ° C there will be a rate of turning point, residence rate, time is related to the surface area of magnesium oxide, with the increase of temperature, at 900-1000 ° C, calcinated alkali magnesium carbonate is low activity magnesium oxide.

　　The above is all about the introduction of magnesium oxide, the activity of magnesium oxide has a very important role in the industrial aspect, we should also pay attention to the production process of magnesium oxide in production, and temperature is one of the factors affecting the activity of magnesium oxide.