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.

Introduction of magnesium aluminate spinel

Bauxite-based sintered magnesium aluminate spinel uses high-quality bauxite with Al2O3 content of more than 76% and high-quality light burned magnesium powder with MgO content of more than 95%. In an ultra-high temperature tunnel kiln, it is sintered at a high temperature above 1800°C. Bauxite-based sintered magnesium aluminate spinel uses high-quality bauxite with Al2O3 content of more than 76% and high-quality light burned magnesium powder with MgO content of more than 95%. The chemical process is sintered at a high temperature above 1800°C in an ultra-high temperature tunnel kiln, with high volume density, high mineral phase content, good grain development and structure. Uniform, stable quality. Magnesium aluminate spinel has good corrosion resistance, corrosion, peeling ability, good slag resistance, abrasion resistance, thermal shock stability Good, high temperature resistance and other performance characteristics. It is the production of refractory products such as magnesium aluminum spinel bricks, ladle lining bricks, ladle castables and other refractory products for the high-temperature zone of cement rotary kilns. Ideal raw materials. Magnesium aluminate spinel is widely used in refractory materials, iron and steel smelting, cement rotary kiln and glass industrial kiln It has good erosion resistance, abrasion resistance and good thermal shock stability. Its main purpose: one is to replace the magnesium chrome sand manufacturing magnesium aluminum spinel brick Used in cement rotary kiln, not only to avoid chromium pollution, but also has good resistance to spalling; the second is used to make ladle castable, greatly improving the steel plate Lining resistance to erosion. It is widely used in steel-making refractory materials. Preparation of high-quality pre-synthesized spinel for amorphous and shaped high-purity refractories The production of new raw materials

The use of fused dense corundum

Electric fused dense electric fused corundum is a kind of high-grade refractory material, the main crystal phase is greater than 96%, the porosity is less than 4%, it has good acid resistance and alkaline energy, and has good properties at high temperature. Good wear resistance, erosion resistance and volume stability. Widely used in iron and steel metallurgy, petrochemical industry, building materials ceramics and other industries, mainly used as blast furnace iron ditch refractory ramming Material, castable aggregate, but also the production of steel-making long water mouth, skateboard and a variety of corundum brick excellent materials. Dense corundum is made of high purity alumina and a reducing agent A new type of high-purity refractory raw material is formed by high-temperature melting and cooling in an electric arc furnace according to a certain ratio. The main crystal phase of dense corundum is a -Al2O3, color It is light gray, has a high melting point, a very high bulk density and a very low porosity, and has excellent wear resistance and slag resistance at high temperatures. , volume stability and thermal shock resistance, is the best refractory raw material in corundum series. Dense fused corundum is the production of blast furnace iron trench castable, ladle castable, ramming material, prefabricated parts and other amorphous refractory materials, as well as continuous casting three major pieces, through. Gas brick, nozzle brick and other kinds of shaped products of the ideal raw material, dense fused corundum is widely used in steel, cement, ceramics, petrochemical and other industries.

Development of White Corundum in Metallurgical Industry Arc Wheel Dressing

White corundum is widely used as we all know. Product size according to international standards and the standard production, can be processed according to user requirements granularity. The general particle size number is F4 ~ F220, and its chemical composition varies depending on the particle size. The prominent point is that the crystal size is small and impact resistant. If the self-grinding machine is used to process and break, the particles are mostly spherical particles, the surface is dry and clean, and it is easy to bond. White corundum is the main raw material of alumina powder, suitable for chromium oxide, etc., by high temperature smelting. Chromium corundum is pink, the hardness is similar to that of white corundum, and the toughness is higher than that of white corundum. Abrasives made of white corundum have good durability and high grinding finish. apply