About high purity magnesium hydroxide

What is high purity magnesium hydroxide?


High purity magnesium hydroxide: it is a white amorphous powder, and the aqueous solution is alkaline. Soluble in dilute acid and ammonium salt solutions, almost insoluble in water and ethanol. It is characterized by large particle size, high purity, good whiteness, easy to absorb carbon dioxide in the air, and is a commonly used raw material in industry.


Since the successful trial production of Wuxi Zehui Chemical Co., Ltd. in 2006, it has been widely recognized in the market. In addition to completely replacing imported products, it has been exported to Japan, South Korea, Europe and other places.


According to the needs of customers, the company can also produce high-purity magnesium oxide products, whose main content can reach 99.6% ~ 99.8%.


How to develop high purity magnesium hydroxide?


High purity magnesium hydroxide is produced by synthetic method with bischofite from Qinghai Salt Lake as raw material. All products are of high purity. It is also the first high-quality raw material for the production of high-end magnesium oxide products such as high-purity light magnesium oxide, high-purity heavy magnesium oxide, medical grade magnesium oxide, electrical grade magnesium oxide, silicon steel grade magnesium oxide and so on.


The preparation methods of magnesium hydroxide include:


1. Physical crushing method


Physical comminution refers to the direct comminution of ore, through dry rough grinding and wet ultra-fine grinding, to produce magnesium hydroxide products with the required particle size grade. The commonly used ore is brucite.


2. Ore calcination hydration method


In this method, the ore is calcined and the prepared magnesium oxide is hydrated to prepare magnesium hydroxide, which is a process of magnesium oxide dissolution and magnesium hydroxide precipitation, in which the dissolution of magnesium oxide is the control step. Due to the different ore compositions, magnesite is more often used.


3. Liquid phase precipitation method


There are two sources of raw materials for this method. One is that magnesite, dolomite, serpentine, etc. are treated by acid hydrolysis or other methods to obtain magnesium salt, which is precipitated with alkali to prepare magnesium hydroxide. One is to precipitate magnesium salt obtained from seawater, salt lake water and well brine with alkali to prepare magnesium hydroxide.


What are the applications of high purity magnesium hydroxide?


High purity magnesium hydroxide is generally used for flame retardant, waste water treatment, flue gas desulfurization, fertilizer, etc. it can also be widely used in chemical industry, metallurgy, building materials, household appliances, plastics, rubber, electronics, ceramics, medicine, food and other industries.


Among them, the flame retardant industry has a large demand, and in the microwave absorbing material industry, because high-purity magnesium oxide has high activity and high dispersion, it can be easily combined with polymers or other materials. This composite material has good microwave absorption performance, and does not reduce the strength, toughness and other indicators of the raw material. Moreover, fibrous magnesium oxide has a reinforcing effect.


High purity magnesium hydroxide has a very special role:


1. Antacids and permeable laxatives.


2. Magnesium hydroxide is an excellent flame retardant for plastic and rubber products. In terms of environmental protection, it can be used as flue gas desulfurizer and can replace caustic soda and lime as neutralizing agent for acid containing wastewater.


3. Magnesium hydroxide is a new type of filling flame retardant. It can reduce the surface temperature of the synthetic material it fills in the flame by releasing the binding water and absorbing a large amount of latent heat when it is heated and decomposed. It can inhibit the decomposition of polymer and cool the combustible gas generated.


4. It can be used as a flame retardant or a flame retardant filler. It can be added to polyethylene, polypropylene, polyvinylidene ramie and ABS resins, and has good flame retardancy and smoke suppression.


What are the advantages of magnesium hydroxide flame retardant?


1. It is a low smoke zero halogen flame retardant material. It is non-toxic and tasteless. It does not produce toxic and corrosive gases when burning. Magnesium hydroxide will not corrode abrasives and will not cause secondary pollution.


2. Excellent flame retardant, smoke suppression performance and filling function. Its physical form is granular, which is conducive to uniform distribution, good compatibility with the substrate, and has little impact on the mechanical properties of the finished product. The modified magnesium hydroxide has good dispersibility.


3. The thermal decomposition temperature of magnesium hydroxide is as high as 340 degrees, which is 100 degrees higher than that of aluminum hydroxide. Therefore, it is beneficial to increase the plastic processing temperature, accelerate the extrusion speed, enhance the plasticizing effect and shorten the molding time. The finished product has a high surface gloss, so there will be no surface defects.


Where will the high purity magnesium hydroxide market go?


China began to develop magnesium hydroxide technology in the 1960s, and is a major producer of magnesium hydroxide. However, due to various reasons, the industrialization process is very slow, and the high-end magnesium hydroxide products are still at a backward level, which is extremely unfavorable to the development of the industry.