The difference between magnesia brick and burnt magnesia brick

Alkaline refractory with magnesia brick content of more than 90% and periclase as the main phase.

Generally, it can be divided into two categories: sintered magnesia brick (also known as burnt magnesia brick) and chemically combined magnesia brick (also known as non-burned magnesia brick). Magnesia bricks with high purity and high firing temperature are called direct-bonded magnesia bricks because of the direct contact of the magnesite grains. The bricks made of fused magnesia are called fused and re-combined magnesia bricks. Magnesia bricks have high refractoriness, good alkali slag resistance, high load softening start temperature, but poor thermal shock resistance. The sintered magnesia brick is made of brick and magnesia brick, and after being pulverized, compounded, kneaded and formed, it is fired at a high temperature of 1550 to 1600 ° C, and the firing temperature of the high-purity product is above 1750 ° C. The non-casting magnesia brick is made by adding a suitable chemical binder to the magnesia, mixing, forming and drying.
The burnt magnesia brick is made of high-quality sintered magnesia as the main raw material, and the pulp is used as the binder. After kneading and high pressure molding, it is fired in a high temperature tunnel kiln at 1550 ° C or higher. Has good thermal stability, erosion resistance and flaking resistance. It is widely used in industrial furnaces such as converters and electric arc furnaces as lining refractory materials.

The fused magnesia brick has the advantages of compact brick structure, high mechanical strength and low impurity content, and is mainly used in the high temperature region of the regenerator of a large glass kiln. The fused magnesia is made by melting high-quality magnesia as raw material, and the English name is fused magnesite. Calcined from magnesite, hydrous ore or magnesium hydroxide extracted from seawater at high temperature. Strong resistance to hydration.