What is Alumina Magnesia Carbon Brick

The magnesia carbon brick is made of high melting point alkaline oxide magnesia carbon brick price (melting point 2800 ℃) and high melting point carbon material infiltrated by slag as raw materials, and various non-oxide additives are added. A non-charcoal composite refractory material combined with a carbon binder. Magnesia-carbon bricks are mainly used for the lining of converters, AC electric arc furnaces, DC electric arc furnaces, and the slag line of ladle. magnesia brick

As a composite refractory material, magnesia-carbon brick effectively utilizes the strong slag erosion resistance of magnesia and the high thermal conductivity and low expansion of carbon, which compensates for the poor spalling resistance of magnesia. The influence of raw materials on the performance of magnesia-carbon bricks, the main raw materials for producing magnesia-carbon bricks, and the quality of magnesia have an important impact on the performance of magnesia-carbon bricks. How to choose magnesia reasonably is the key to producing magnesia-carbon bricks. There are fused magnesia and sintered magnesia, which have different characteristics. Fused magnesia: large grains, few impurities, few silicate phases, high degree of direct bonding of grains, and few grain boundaries. Alumina magnesia carbon brick

Alumina magnesia brick

The requirements for the binder in the production of magnesia-carbon bricks are:

1. High viscosity and fluidity at room temperature, and good wettability to magnesia and graphite

2. In the process of heat treatment, the binder can be further condensed, so that the product has a higher strength

3. During the heat treatment process, the binder will not cause excessive expansion and contraction of the product to avoid cracking of the product

4. The C content should be high, and the carbon polymer after coking treatment has good high temperature strength

Generally, the binders used in the production of magnesia-carbon bricks include coal tar pitch, coal tar, special carbonaceous resins, polyols, pitch-modified phenolic resins, and synthetic phenolic resins.