Hebei Messi Biology Co., Ltd. stated that the direct precipitation method is to add a precipitant to a soluble salt solution containing one or more particles, generate a precipitate under certain conditions, precipitate from the solution, and obtain the product by thermal decomposition. For example, using MgCl2·6H2O and NH3·H2O as raw materials, adding precipitant NH3·H2O to the MgCl2·6H2O solution at a certain temperature and under sufficient stirring conditions, and after filtering, washing, drying, and calcining, nano-magnesium oxide with an average particle size of 62nm is obtained. This method has a simple process, low requirements for equipment technology, high product purity, good stoichiometry, and low preparation cost, but the product particle size is large and the particle size distribution is wide. Using ammonia water and brine as raw materials and anhydrous ethanol as the reaction medium, a supercritical drying method is used to obtain a 50-100nm nano-magnesium oxide product.
Nano magnesium oxide is a new type of high-function fine inorganic material, generally refers to a collection of nanoparticles with a particle size between 1 and 2000nm. Due to its fine particles, it has special functions such as heat, light, electricity, mechanics and chemistry that are different from the main material. Nano magnesium oxide is compounded with polymers or other materials and has good microwave absorption properties. Ultrafine powder magnesium oxide can be sintered at low temperature without the use of sintering aids to make high-density fine-grained ceramics, which is expected to be developed into cutting-edge materials used under harsh conditions such as high temperature and high corrosion. Nano magnesium oxide can also be used as a sintering aid and stabilizer for other nanoparticles such as zirconium oxide, aluminum oxide, and iron oxide to obtain high-quality nanophase ceramics, as well as auxiliary materials for various electronic materials.
Highly active magnesium oxide generally refers to magnesium oxide with an iodine absorption value of 120-180mg/g. It is mainly used as a promoter and activator for chloroprene rubber, butyl rubber, nitrile rubber and fluororubber, and is a filler for adhesives, plastics, paints, and paper. Nano-active magnesium oxide has strong adsorption and high surface chemical activity, and can be used as an efficient dissociative adsorbent to adsorb toxic chemicals.