Everyone knows that magnesium oxide is mostly a substance that acts on industry. We often talk about the activity of magnesium oxide, but there is still a lot of unclear. In other words, the heavy weight is pure MgO, the light weight is xMgO•yMg(OH) 2, namely basic magnesium oxide. The percentage of light magnesium oxide plays an important role in activity.

1. Test the activity of magnesium oxide

Generally speaking, high-activity magnesium oxide is made by decomposing basic magnesium carbonate at low temperature for a long time. The furnace structure is special the energy consumption is high. The apparent specific volume of the products obtained is also large. In addition, there is also a method of preparing high-activity magnesium oxide with an iodine absorption value higher than 170 mg I2/gMgO light magnesium oxide using microwave radiation. The apparent specific volume of the highly active magnesium oxide is relatively small, 2.5-3.3ml/g.

Second, the use of magnesium oxide activity

Activated magnesium oxide is mainly used as activator accelerator for butyl rubber, neoprene rubber, fluororubber, nitrile rubber, it is also one of the main additives for paints, adhesives, plastics other products. With the development of science, technology economy, activated magnesium oxide has been more more widely used, while the dosage is increasing, the requirements for product activity are becoming more diversified.

Third, the method of producing magnesium oxide

There are many domestic methods for producing magnesium oxide, such as seawater-lime method, brine-soda process, brine-carbamine method, dolomite, magnesite-carbonation method, etc. Regardless of the production method used, the activity of magnesium oxide is related to the production process. There are many factors that affect the activity, such as internal defects, specific surface area, production methods other factors. Taking the brine-soda process 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 volume control, dehydration time after pyrolysis.

Studies have shown that the calcination temperature has an effect on the activity of magnesium oxide. The calcination temperature, temperature rise rate residence time have a great influence on the continuous decomposition of carbonate. At 700 ℃, there will be a speed turning point. The residence speed time are related to the surface area of magnesium oxide. As the temperature rises, at 900-1000°C, calcining basic magnesium carbonate produces 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 industry. We must also pay attention to the production process of magnesium oxide in production, temperature is one of the factors that most affect the activity of magnesium oxide.