Chrome is an vital refractory material. It can growth the refractory bricks erosion resistance potential to mirabilite (salt cake). Magnesia Chrome bricks had been used as refractories for rotary lime kilns, cement kilns, or comparable uses for many years, because of their splendid corrosion resistance.
Magnesia chrome bricks exhibits excellent corrosion resistance, excessive melting temperatures, low thermal conductivity, properly thermal power, and tremendous thermal shock resistance. The refractoriness of magnesia chrome brick is over 2000℃,and the refractory below load is a above 1550℃. It has true constant volume in excessive temperature , the overall performance beneath sudden cold and sudden hot is higher than magnesia bricks.
Despite these advantages, magnesia-chrome based totally refractory linings also suffered a extreme drawback. The chrome within the magnesia-chrome bricks can react with the lime and alkali to form hexavalent chrome. Hexavalent chrome is a poisonous fabric requiring unique disposal measures. Thus, using magnesia-chrome bricks results in steeply-priced disposal and remediation procedures on the end of their use.
Magnesia Chrome bricks include regular magnesia chrome brick, direct-bonded magnesia chrome brick, rebonded magnesia chrome brick, and semi-rebonded magnesia chrome brick.
Ordinary magnesia chrome brick is crafted from sintered magnesia and chrome ore and sintered at excessive temperature. It has a better bulk density and more potent thermal resistance than the magnesia brick. It is utilized in cement rotary kilns, glass kiln regenerators, everlasting lining of metallic furnace everlasting and refining ladle permanent lining of refining ladle.
Directe-bonded magnesia chrome brick is made of low impurity chrome ore and excessive purity magnesia and fired at excessive temperature over 1700℃. It has strong slag resistance and true performance beneath high temperature. It is implemented in cement rotary kilns, electric arc furnaces, and non-ferrous steel furnaces.
Rebonded magnesia chrome brick is made with artificial fused magnesia, shaped beneath high pressure and fired at extremely excessive temperature. It is used in tapping hollow of AOD furnace, the decrease vessel of vacuum chamber and snorkel of RH furnace, and the slag line of excessive temperature furnaces.