What is the difference between fused white corundum, dense corundum and brown corundum in refractory applications

Fused white corundum, dense corundum (tabular corundum), brown corundum. These three are all aluminum raw materials. Fused white corundum is calcined alumina or industrial alumina as raw material, high temperature melting in the electric arc furnace, white, block material, crystal for the strip and rhombus, and often the skeleton of the crystal. Because the raw material is very pure, no chemical reaction occurs in the electric furnace operation, but the temperature of the molten liquid, the cooling rate, etc. have a great influence on the structure of the block. Fused white corundum, dense corundum (tabular corundum), brown corundum. These three are all aluminum raw materials. Aluminum content Dense corundum and white corundum reached 99%, brown corundum aluminum content: 95%. Price, dense corundum higher than white corundum White corundum is higher than brown corundum. So in the application of refractory materials, dense corundum is better than white corundum, brown corundum ranked third

Properties of Magnesium Aluminate Spinel

Magnesium aluminate spinel is widely used in steel-making refractories due to its special properties of slag corrosion resistance, good thermal shock resistance and high strength at high temperature. High quality pre-fit The preparation of spinel provides a new raw material for the production of amorphous and shaped high purity refractories. The two main methods for the synthesis of spinel are sintering and electrofusion. Most spinel materials are made from high-purity synthetic alumina and chemical grade magnesia, That is, sintering in a shaft kiln and electromelting in an electric arc furnace. The advantage of sintering magnesium aluminate spinel is that the process is a continuous ceramization process, controlling the feed in the kiln. Velocity and uniform temperature distribution, resulting in a very uniform crystal size of 30-80 μm and low porosity (<3%) of the product. Electromelting production of magnesium aluminum spinel is a representative intermittent operation, large casting blocks need to extend the cooling time, the cooling of the casting block leads to microstructure. Uneven, due to faster cooling, the outer spinel crystals are smaller than the inner ones, and the low melting point impurities are concentrated in the center. Therefore, it is necessary Spinel raw materials are sorted and homogenized. Another advantage of using high-purity raw materials to produce aluminum magnesium spinel is the low impurity content in the aluminum magnesium spinel aggregate (MgO A1203>99%), especially SiO2 The low content makes it have good high temperature performance. Alumina-based aluminum magnesium spinel has no good performance as synthetic alumina-based aluminum magnesium spinel and can only be used Corrosion resistance and high temperature strength requirements are not high parts.

Magnesium aluminate spinel manufacturers take you to fully understand magnesium aluminate spinel

Magnesium aluminate spinel has excellent properties, such as high melting point (2135), high hardness (16GPa), low thermal expansion, high corrosion resistance and excellent optical properties. Widely used in refractory materials, humidity sensors, transparent ceramic materials, anode materials, artificial flange materials and catalytic materials.