High quality direct combination of magnesia chrome brick manufacturer

The direct combination of magnesia-chrome bricks has been widely used in cement kilns and high-temperature furnaces in the steel industry. Synthetic magnesia-chrome sand is the main raw material for directly combining magnesia-chrome bricks. The use of sintering synthesis process, the use of synthetic magnesium chrome sand directly combined with magnesia chrome bricks, not only make full use of China's rich magnesite resources, but also reduce the firing temperature.

 

The synthetic magnesia chrome sand used for the direct combination of magnesia chrome bricks is made of natural magnesia raw materials such as magnesite, light burnt magnesium powder and chromite ore, which are matched according to design requirements, finely ground, pressed, calcined or passed. A raw material mainly composed of magnesia-chromium spinel obtained by electrofusion.

 

When the sintered magnesia chrome sand is manufactured, the calcined magnesium powder and the selected chrome ore are proportioned according to the design requirements, and after further grinding and pressing, the calcined magnesia chrome sand is obtained by calcining at 1700 to 1900 ° C in an oxidizing atmosphere. . The fused magnesia chrome sand is made of light burnt magnesium powder and selected chrome ore as a raw material, which is compounded and melted. The fused magnesia chrome sand has perfect crystal structure, compact structure, low porosity and high direct bonding. Therefore, the fusion casting combined with the magnesia chrome brick has excellent corrosion resistance and is widely used in places where corrosion is very demanding. However, the thermal shock resistance of the cast-and-fused magnesia-chrome brick is inferior to that of the magnesia-chrome brick made of magnesia and chromite.

The chrome ore used in the refractory material belongs to the aluminum chromite (MgFe) (CrAl) 2O4 type, generally containing w (Cr2O3).

For 30% to 60%, the content of iron oxide (based on Fe2O3) should be less than 14%, and the content of impurities such as SiO2 and CaO should be as small as possible to reduce the low melting of iron spinel and tetracalcium ferric acid. generate. The synthetic magnesium-chromium spinel sand mineral composition is complex and its properties vary greatly. According to different generation methods, it can be divided into: sintering method to synthesize magnesia chrome sand and electrofusion method magnesia chrome sand.

 

As the China refractory brand of Zhengzhou Sunrise Refractory, it not only pays attention to the expansion of its own scale, but more importantly, it always stands in the long-term development perspective and continuously develops new types of refractory materials, so as to continuously meet more stringent market demands and conform to the times. The development of the trend. Sunrise refractory specializes in producing all kinds of high-aluminum bricks, refractory bricks, clay bricks, castables and other products. Welcome customers to visit the factory and establish long-term cooperative relationship.