Magnesia-chrome bricks are refractory products with magnesium oxide (MgO) chromium trioxide (Cr2O3) as the main components, periclase spinel as the main mineral components. This type of brick has high fire resistance, high temperature strength, strong resistance to alkaline slag erosion, excellent thermal stability, also has certain adaptability to acid slag. The main raw materials for making magnesia-chrome bricks are sintered magnesia chromite. The purity of magnesia raw materials should be as high as possible. The requirements for the chemical composition of chromite are: Cr2O3: 30 to 45%, CaO: ≤ 1.0 to 1.5%.
The production process of fired magnesia-chrome bricks is similar to that of magnesia bricks. In order to eliminate bricks due to MgO Cr2O3, Al2O3
The loose effect caused by the expansion of the iron oxide when the spinel is reacted can also be made of synthetic chromium sintered bricks. In addition, there are unfired magnesia-chrome bricks, for example, unfired magnesia-chrome bricks combined with an inorganic magnesium salt solution. The non-fired magnesia-chrome brick has a simple production process, low cost, good thermal stability, but the high temperature strength is far less than that of the fired brick. At the end of the 1950s, a so-called "direct bonding" magnesia-chrome brick was developed. The characteristics of this brick are pure raw materials, high firing temperature, direct bonding between high-temperature phases such as periclase, spinel, low-melting phases such as silicate, which are isolated islands, so the high temperature of the brick is significantly increased Strength slag resistance.
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