Hebei Messi Biology Co., Ltd. stated that magnesium hydroxide can be widely used in construction, flue gas treatment, propylene oxide, rubber, etc. due to its alkalinity, antibacterial effect, non-toxicity, and unique reinforcing properties when used as an additive. Pharmaceutical, papermaking, petroleum additives and other industries. Due to its alkalinity and low cost, magnesium hydroxide is widely used for desulfurization and denitrification of waste incineration and factory flue gas and wastewater treatment. Due to its own antibacterial effect, it is also an important filling agent for current tooth root canal treatment. For different application fields, magnesium hydroxide has a “professional” side, being low-key and capable.
1 new material
1.1 Flame retardant materials
Magnesium hydroxide powder is widely used as a filler in polymer materials. Adding magnesium hydroxide to polymer materials can improve the thermal stability and flame retardant properties of composite materials; magnesium hydroxide is alkaline and can decompose when heated with PVC, and has a certain thermal stabilization effect. At the same time, magnesium hydroxide can generate water when heated, which can have cooling, oxygen-blocking and flame-retardant effects.
1.2 Degradable polymer materials
Magnesium hydroxide can be used as an auxiliary for environmental absorption of plastics. It has dechlorination, cracking and alkaline degradation effects on the decomposition of plastics. Since nano-magnesium hydroxide has obvious absorption in the ultraviolet region, it can promote photodegradation of LDPE films. At the same time, nano-magnesium hydroxide can also strengthen and toughen LDPE and improve the mechanical properties of polymer materials.
2Wastewater treatment
The role of magnesium hydroxide in wastewater can be basically summarized into four aspects: neutralizing free acids in wastewater, neutralizing acid salts in wastewater, reacting with metal ions to produce water-insoluble precipitates, and adjusting the pH of wastewater. value. In practical applications, magnesium hydroxide is convenient to produce, and its price is more favorable than calcium chloride and other calcium salts. During the treatment process, it can neutralize the acidity of wastewater and effectively remove fluoride, and the treatment cost is relatively low.
3Desulfurizer
As a desulfurization agent, magnesium hydroxide has a higher desulfurization efficiency than calcium carbonate, uses less than calcium carbonate, consumes less energy than calcium carbonate, and has no carbon dioxide emissions.
4Medical and health
Magnesium hydroxide is used for disinfection in a variety of places, such as scientific research, laboratories, medicine, factories, etc. It has a long history of use in clinical medicine. In surgical treatment, it is used for wound disinfection, which can neutralize the acidic substances produced by bacteria to achieve the purpose of disinfection and reduce the incidence of postoperative infection and complications. In the treatment of oral diseases, magnesium hydroxide paste is commonly used clinically as a root canal disinfectant when performing root canal treatment on teeth with periapical disease. The strong alkalinity of magnesium hydroxide can weaken the activity of oral root canal toxins, protect tooth root canals, reduce the incidence of oral infection, and effectively protect oral teeth and dental bone marrow.
5 food processing
Adding a certain amount of food-grade magnesium hydroxide to milk powder can not only adjust the pH value of the milk powder and promote the rapid dissolution of the milk powder in water, but also supplement calcium. Adding magnesium hydroxide to soy products can act as a coagulant and also provide calcium. Adding magnesium hydroxide to millet flour has a significant optimization effect on the gel properties of millet flour, giving millet flour a better taste.
6 other applications
In the process of making sugar, magnesium hydroxide is used to neutralize the acid in the syrup, and then carbon dioxide is introduced to turn the remaining magnesium hydroxide into precipitate and filtered out, thereby reducing the sour taste of the sugar. In the metallurgical industry, in order to coat the metal surface, impurities (including metal oxides) on the metal plate surface must be removed first, so dilute sulfuric acid must be used to remove them first. The wastewater generated during the production process is usually neutralized with magnesium hydroxide. In addition, magnesium hydroxide can be used in agriculture to reduce soil acidity and improve soil structure.