Magnesium-chromium brick of new building materials is made of high melting point alkaline oxide magnesia (melting point 2800 C) and high melting point carbon material which is difficult to be invaded by slag, and various non-oxide additives are added. A non-burnt carbon composite refractory made of carbon binder. Magnesium-carbon brick is mainly used in converter, AC arc furnace, DC arc furnace lining regenerative brick, ladle slag line and other parts.
As a kind of composite refractory, magnesia-chrome brick effectively utilizes magnesia's strong slag erosion resistance, high thermal conductivity and low expansion of carbon, and compensates for the biggest shortcoming of magnesia's poor spalling resistance.
Magnesium-chromium brick has four main characteristics: good high temperature resistance; strong slag resistance; good thermal shock resistance; low high temperature creep.
Effect of raw materials on properties of magnesia-chrome bricks
Magnesium chrome brick pric
The quality of magnesia has a very important influence on the properties of magnesia-carbon bricks. How to select magnesia reasonably is the key to produce magnesia-carbon bricks. Magnesia has fused magnesia and sintered magnesia, which have different characteristics.
Fused magnesia: large grain, less impurities, less silicate phase, high degree of grain direct bonding, less grain boundaries.
Sintered magnesia: fine grains, relatively more impurities and silicate phase, poor direct bonding.
For magnesia raw materials, besides chemical composition, high density and large crystallization are also required in terms of structure. Therefore, as the quality index of magnesia raw materials for producing magnesia-carbon bricks, the following contents should be examined:
1. Magnesium oxide content (purity
2. Types of Impurities, Especially C/S and B2O3 Contents
3. Density, pore size and pore morphology of magnesia (sintering property)