Production of magnesium hydroxide flame retardant
A flame retardant refers to an auxiliary agent that makes the polymer less prone to ignition and slows its combustion after ignition. The inorganic flame retardant represented by aluminum hydroxide and magnesium hydroxide is flame retardant by chemical decomposition and heat release, and has non-toxicity, smoke suppression and decomposition products (aluminum oxide, magnesium oxide). ) Chemically stable and so on, so there is no secondary hazard. The flame retardant filler prepared by using brucite as a raw material has the dual functions of filling and flame retardant, and has the following characteristics: 1) halogen-free, non-halogen flame retardant; 2) high processing temperature (initial decomposition temperature is lower than hydrogen) Oxidation of magnesium oxide and magnesium
The main component of brucite is magnesium hydroxide, which is pulverized and calcined to decompose it into magnesia (divided into light burnt magnesium and heavy burnt magnesium. Magnesia produced by magnesite has energy saving and pollution reduction, The products have the advantages of low cost, etc. The products can be used in the fields of refractory building materials, etc. The production of light burnt magnesium and burnt magnesium is currently the main use of the brucite mine in China.
Aluminum is much higher, up to 320 ° C, aluminum hydroxide is 220 ° C), so it can be applied to resins with higher processing temperature; 3) itself is non-toxic, odorless, does not produce toxic gases when burning, does not corrode mold, does not produce Secondary pollution, excellent flame retardant and smoke suppression performance. However, the use of magnesium hydroxide as a flame retardant has the following disadvantages: first, the flame retardant efficiency is relatively low, which requires a higher amount of addition; second, the surface naturally exhibits the "hydrophilic oleophobic" property in the organic high polymer. It is difficult to disperse evenly.
After the ultrafine pulverization and appropriate surface modification treatment of the brucite mine, a high-grade magnesium hydroxide flame retardant can be prepared. China has not yet specified relevant quality standards for flame retardants prepared from brucite. Table 1 shows the main technical parameters of the Zerogen series of products prepared and synthesized by the use of brucite as a raw material.
The use of brucite to produce magnesium metal is also one of its applications. Similar to the use of brucite to produce magnesium oxide, it has the advantages of environmental protection, low energy consumption and low cost.
Reinforced, reinforced fiber
Because the fibrous brucite is hard, it is easy to disperse in the slurry. The needle-shaped fiber bundle is easy to loosen after being wetted by water, and it is not easy to get up. It has a large volume expansion after being loosened by other fibers, and is an excellent reinforcement and supplement. Strong material. Fibrous brucite is currently mainly used in the production of microporous calcium silicate and calcium silicate board and other mid-range insulation materials. It is characterized by high whiteness, small bulk density and low cost. It can replace asbestos fiber to make non-asbestos insulation materials.
The calcined magnesia is calcined at a high temperature to obtain a light burnt magnesium recalcined magnesia (brucite bitter soil). If lithium hydride or lithium fluoride is further incorporated, it is pressed into pellets having a diameter of 40 to 60 mm, and then put into smelting. Further, a magnesium agent or a rare earth catalyst is added during the smelting process to obtain a high-purity magnesia.
The brucite and dolomite are calcined at high temperature to form oxides of magnesium and calcium, then ground, and then mixed with an organic binder to be pressed into a mold, and after secondary calcination, refractory bricks can be obtained. Such refractory bricks can be used in the metallurgical industry to replace magnesium oxide high temperature refractory brick
Other fields .
Fengcheng City Heqi Brucite Mining Co., Ltd., is an imports and exports mining company registered in 1998 in Fengcheng City of Liaoning Province. the company is located in Fengcheng City, Primarily engaged in processing minerals. The company property mainly manufactures magnesium hydroxide flame retardant and brucite powder. The export work is handling by DALIAN HEXIN NEW MATERIAL TECHNOLOGY CO., LTD.
Our annual output amount is up to 100,000 tons. Quality,Integrity, Innovation are our business ideas. Relying on quality products, good services, our company possess good reputation in the line.
"Business Integrity, Standardize Services, Sustainable development, Dedicated to Community" is the company’s Principles. During several years developing, the company possesses own mines and processing plants,It consists of the heqi brucite mine in Fengcheng city (reserves 3,000,000 tons, annual output is 100,000 tons).