Chrome is an important refractory material. It can increase the refractory bricks erosion resistance ability to mirabilite (salt cake). Magnesia Chrom e bricks have been used as refractories for rotary lime kilns, cement kilns , or similar uses for many years, because of their excellent corrosion resi stance.
Magnesia chrome bricks exhibits good corrosion resistance, high melting tem peratures, low thermal conductivity, good thermal strength, and excellent t hermal shock resistance. The refractoriness of magnesia chrome brick is ove r 2000?,and the refractory under load is a above 1550?. It has good steady volume in high temperature , the performance under sudden c old and sudden hot is better than magnesia bricks.
Despite these advantages, magnesia-chrome based refractory linings also suf fered a serious disadvantage. The chrome within the magnesia-chrome bricks can react with the lime and alkali to form hexavalent chrome. Hexavalent ch rome is a toxic material requiring special disposal measures. Thus, the use of magnesia-chrome bricks results in costly disposal and remediation proce dures at the end of their use.
Magnesia Chrome bricks include ordinary magnesia chrome brick, direct-bonde d magnesia chrome brick, rebonded magnesia chrome brick, and semi-rebonded magnesia chrome brick.
Ordinary magnesia chrome brick is made from sintered magnesia and chrome or e and sintered at high temperature. It has a higher bulk density and strong er thermal resistance than the magnesia brick. It is used in cement rotary kilns, glass kiln regenerators, permanent lining of steel furnace permanent and refining ladle permanent lining of refining ladle.
Directe-bonded magnesia chrome brick is made of low impurity chrome ore and high purity magnesia and fired at high temperature over 1700?. It has strong slag resistance and good performance under high temperature. It is applied in cement rotary kilns, electric arc furnaces, and non-ferrous m etal furnaces.
Rebonded magnesia chrome brick is made with synthetic fused magnesia, shape d under high pressure and fired at ultra high temperature. It is used in ta pping hole of AOD furnace, the lower vessel of vacuum chamber and snorkel o f RH furnace, and the slag line of high temperature furnaces.
The Semi-reboned magnesia chrome brick is made from Fused Magnesia-Chrome m elting grain, high purity fused and burned magnesia sands, and chrome ore t hrough ultra high temperature. It has both the excellent thermal shock resi stance of the direct bonded brick and the good corrosion resistance of the Fused Rebonded magnesia chrome Bricks.
Zhengzhou Sunrise Refractory Co., Ltd. is a refractory supplier from China, offering a wide range of refractory materials. The magnesia chrome brick f rom Sunrise is made from high quality sintered magnesia and refractory leve l chrome ore and has excellent refractory performance.