We all know that magnesium oxide is mostly industrial substances, we often talk about the activity of magnesium oxide, but there is still a lot of unclear, in other words, the heavy is pure MgO, and the light is XMgO ? YMG (OH)2, that is, basic magnesium oxide. The percentage of light magnesium oxide plays an important role in the activity.


First, detect the activity of magnesium oxide


Generally speaking, high active magnesium oxide is made by decomposing basic magnesium carbonate for a long time at low temperature. The furnace structure is special, the energy consumption is high, and the apparent specific volume of the products is also large. In addition, microwave radiation has also been used to prepare high active magnesium oxide from light magnesium oxide with an iodine absorption value higher than 170 mGi 2/ GmO. The apparent specific volume of this highly active magnesium oxide is relatively small, 2.5-3.3mL /g.


Two, the use of magnesium oxide activity


Active magnesium oxide is mainly used in butyl rubber, neoprene rubber, fluorine rubber, nitrile rubber activator and accelerator, or paint, adhesives, plastics and other products of one of the main additives. With the development of science, technology and economy, active magnesium oxide has been more and more widely used, and the amount of increasing at the same time, the requirements of product activity are more and more diversified.

Method of producing magnesium oxide

There are many methods to produce magnesium oxide in China, such as seawater - lime method, brine - soda soda method, brine - carbon ammonia method, dolomite, magnesite - carbonization method, etc. Regardless of the production method, the activity of magnesium oxide is related to the production process. There are many factors affecting the activity, such as internal defects of the lattice, specific surface area, production method and so on. Taking brine-soda soda method as an example, the activity of magnesium oxide has a great relationship with the reaction temperature, pyrolysis temperature, reaction concentration (soda soda, brine), pressure, water quantity control, dehydration time after pyrolysis, etc.

The results show that the calcination temperature has an effect on the activity of magnesium oxide. Calcination temperature, temperature rise rate and residence time have great influence on the continuous decomposition of carbonate. At 700℃, there will be a turning point in the rate. Residency rate and time are related to the surface area of magnesium oxide. With the increase of temperature, the calcination of basic magnesium carbonate at 900-1000℃ produces low activity magnesium oxide.

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