Industrial Application of Brucite and Brucite Superfine Powder

Industrial application of brucite and brucite superfine powder

Brief introduction to the application of brucite and brucite superfine powder:

1. Application in paper industry. 

Brucite has the characteristics of high whiteness, good peeling, strong adhesion and basically no water absorption. The former Soviet Union used it as paper filling together with calcite to change papermaking from acid to alkali, and to reduce the pollution of pulp water. In papermaking industry, brucite replaces lime in the process of producing magnesium sulfite pulp, which can absorb and make waste pulp water recyclable and greatly reduce the pollution of waste pulp water to the environment. Because brucite does not absorb water in the air, it can also be used as packing for moisture-proof wrapping paper.

2. Application in fire prevention and flame retardant materials

The non-halogen-free Mg (OH)-2 flame retardant was prepared by ultra-fine grinding and surface treatment of natural brucite minerals. In use, it is as non-toxic and harmless as the decomposition product of the synthesized Mg (OH)-2 flame retardant itself, and it is an environment-friendly flame retardant. In the production of Mg (OH) 2 flame retardant from brucite, natural minerals are used at the source, and the whole processing process is basically zero emission. It can be said that from the source to the product, it meets the requirements of greening, so the development potential is huge. The results of research and application in recent years show that when the content of brucite flame retardant is above 40phr, the composite can be used as flame retardant material. Good smoke suppression performance, will not cause secondary pollution. With the increase of brucite flame retardant filling amount, the residual carbon content increases and the combustion performance of the material decreases. When the filling amount reaches 60phr, brucite resin composites can be used as refractory materials. However, the mechanical properties of resin composites will be reduced by adding a large number of brucite. In order to meet the requirements of flame retardancy and reduce the mechanical properties of the material, ultra-fine particle size, fiber brucite, surface treatment, addition of elastic body or grafting compatible agent, grafting of matrix resin or formation of crosslinked network structure can be adopted. Japan has developed a coating made of cement, brucite and Some other substances are mixed in an appropriate proportion. This kind of coating has the characteristics of light weight, good decoration, strong weatherability, good fire resistance, no peeling after fire and so on. It can be used for surface coating of ships, high-grade houses, etc.

3 preparation of magnesium oxide

In magnesite, magnesium oxide content is high, and magnesium oxide can be prepared by calcining brucite directly. The process is simple, the cost is low, and it is easy to control. Refractory grade magnesium oxide can be prepared from brucite. As a refractory material, brucite has been greatly developed in foreign countries. Foreign water magnesite and dolomite are calcined into magnesium and calcium oxides at high temperature, then ground, then mixed with organic binders to form molds, refractory brick products are prepared after secondary calcination, and high grade magnesite can also be prepared by using brucite. Brucite, as a refractory material, has been greatly developed in foreign countries. Japan needs to import about 40 to 50, 000 tons of brucite every year to meet the needs of industry. The need for industry development.

The advantages and disadvantages of magnesium smelting with brucite, magnesite and serpentine are compared, the feasibility, advantages and disadvantages of Pijiang method and semi-continuous silicothermic method are discussed, and it is pointed out that magnesium smelting with brucite has the advantages of reducing cost, saving energy and reducing environmental pollution. According to other sources, some people use Liaodong brucite trial production samples, and have made products.