High-purity magnesium oxide has excellent alkali resistance and electrical insulation at high temperatures, and has good light transmittance, and can often be used as a high-temperature heat-resistant material. In the ceramic field, it is used as a raw material for light-transmitting ceramic crucibles and substrates. In the electrical field, it is used as filler for magnetic devices, insulating materials and various carriers. Used as a ceramic substrate, the thermal conductivity is more than 2 times higher than that of alumina, and the loss of electrolyte is only 1 10 of alumina. It can also be used as a raw material for high-purity fused magnesia, and can be used as an "analytically pure" magnesium oxide chemically.
High-temperature solid heat storage materials are more suitable for thermal storage electric heaters, such as magnesium oxide materials are widely used. The international well-known brands of thermal storage electric heaters are made of this material, and the technology and process have been very mature. Of course, there are still some people who are studying phase change heat storage materials, such as paraffin, inorganic hydrated salts, aluminum-based alloys and other phase change heat storage materials, and have made certain achievements, but due to the complexity of technology, it is impossible to realize industrialization, so there is no phase change material heat storage electric heater so far. However, there are still advantages to the use of phase change heat storage materials for solar heat storage.
Magnesium oxide can be used in pulp bleaching. Compared to the traditional bleaching process, magnesium oxide can replace caustic soda. At the same time, magnesium oxide can improve the viscosity of the slurry, maintain the brightness of the pulp, and reduce the COD content and production cost.
In the process of hydrogen peroxide bleaching pulp, magnesium oxide can replace caustic soda, play a role in reducing the content of iron and manganese ions in the slurry, and can also avoid yellowing due to the presence of excess iron, and improve the quality of the slurry. At the same time, magnesium oxide has a buffering effect and is easy to control the pH value. If it is used in combination with inorganic complexing agents such as phosphate and silicate, the effect will be better.