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Properties and functions of reactive magnesium oxide

Reactive magnesium oxide, also known as light-burned magnesium oxide or caustic magnesium oxide, is magnesium oxide formed by calcining magnesium compounds below 900°C. The chemical activity of magnesium oxide can be expressed by the iodine absorption value (adsorption performance index). The greater the chemical activity, the greater the adsorption capacity. The higher the iodine value, the lighter it is. When the iodine absorption value is 120-180 mg/g, it is called high reactive magnesium oxide. When the iodine absorption value is 50-80 mg/g, it is called medium reactive magnesium oxide. When the iodine absorption value is 19-43 mg/g, it is called low reactive magnesium oxide.

High reactive magnesium oxide

Reactive magnesium oxide is generally relative to heavy magnesium oxide. Since the activity of a solid substance is proportional to its surface area, some people use the size of its surface area to express activity, so the specific surface (surface area per unit mass of a substance) is introduced. Specific volume (ml/g) is the reciprocal of bulk density. Generally speaking, highly reactive magnesium oxide is in the form of ultrafine powder, which refers to particles with a particle size of 10-1000nm. Due to the extremely small particle size of ultrafine particles, they often have poor performance in magnetism, electricity, sound, heat and sensitivity. It shows special properties that conventional materials do not have, so it is widely used as a new type of material. The activity expressed by the citric acid activity value is 12-25. The smaller the value, the higher the activity. It is expressed by the iodine absorption value. The activity is 80-120 (mgI/100gMgO), the specific surface area is between 5-20, and the specific volume is between 6-8.5ml/g. Due to its large specific surface area, it has extremely high chemical activity and physical adsorption capacity. , has good sintering performance, achieves low-temperature sintering without the use of sintering aids, and is used to prepare high-functional fine inorganic materials.

With the development of science, technology and national economy, the application of reactive magnesium oxide will become more and more extensive, and the demand will further increase. Highly reactive light magnesium oxide is made of soluble magnesium salt and dolomite as raw materials, and is refined with advanced technology. Processed. The product has fine particle size, good dispersion compatibility and high iodine absorption value. High activity, stable quality and good performance. Widely used in chloroprene rubber, fluorine rubber, butyl rubber, chlorinated polyethylene (CPE), polyvinyl chloride (PVC) plastics and adhesives, advanced inks, paints, etc. Used in rubber sheathed cables, mining cables, marine cables and other industries, it can improve the cable’s anti-corrosion, acid resistance, high temperature resistance and other properties, and improve the working stability under harsh conditions.

Reactive magnesium oxide can also be used as an adsorbent to remove fluoride from water. Currently, rural drinking water has water quality problems such as high fluoride, high arsenic, brackishness, untreated Class IV and super Class IV surface water, especially excessive fluoride in the water, which will seriously affect the health of people. Causes fluorosis, which greatly harms people’s health. Using the adsorption effect of activated magnesium oxide, it can effectively remove fluorine from water and solve water safety.

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