Products Description
Brown corundum, commonly known as adamantine, is made from bauxite, carbon materials and iron filings in an electric furnace after melting and reducing the brown artificial corundum, hence the name. Brown corundum has high strength, excellent thermal conductivity and good resistance to oxidation, and does not deform at high temperatures. There are four main applications for brown corundum, namely functional ceramics, high grade refractories, abrasives and metallurgical raw materials.
Brown corundum is a necessary material for the abrasives and refractory industries, and is an indispensable product for the development of the national economy, and its importance is very prominent. Brown corundum is made from high quality bauxite, anthracite, iron filings, smelted in an electric arc furnace at a high temperature of more than degrees, crushed and shaped by an autogenous mill, magnetically selected to remove iron, sieved into a variety of particle sizes, its dense texture, high hardness, spherical particles, suitable for the manufacture of ceramics, resins and other cemented abrasives, as well as grinding, polishing, sandblasting, precision casting, etc., and can also be used to manufacture advanced refractory materials.
The main component of brown corundum is alumina, and the grade is distinguished by the aluminium content, the lower the aluminium content the lower the hardness. Brown corundum is produced by reacting ore with coal and iron in a certain ratio. The coal acts as a reducing agent, while the iron filings act to remove the silicon from the ore and the iron forms low-silica iron with the silicon.
Brown fused Alumina Properties
Dark brown, dark blue after calcination, tripartite crystal system, hardness (Mohs) ≥ 9.0, melting point 2250°C, maximum use temperature 1900°C.
Brown fused Alumina Features
1. Less dust. Surface abrasive blasting with brown corundum generates less dust during the blasting process due to its high specific gravity. This ensures the health and safety of the operator and improves visibility for the operator. In contrast to slag, which is formed by high temperature cooling with cold water or even sea water, slag forms a glass phase structure and is brittle, as slag is more brittle it is easily crushed to form small particles during the spraying process. The relatively small specific gravity of the slag causes small slag particles to be suspended in the air, causing pollution to the environment. Similarly, quartz sand is a very brittle abrasive.
2. High efficiency. Brown corundum, under a certain pressure, is able to hit the surface of an object with sharp edges in large quantities and quickly, so it is seen as a very fast way of spray grinding. The acceleration and speed of the particles in the air stream is a function of inertia and particle size. The smaller the particles, the easier the acceleration and therefore the higher the impact on the surface, resulting in a very high cleaning speed, which is usually twice as fast as other conventional abrasives. Analysis of the differences between brown corundum and other abrasives of diamond.
3. Low attrition. The unique particle size of brown corundum ensures that more effective particles hit the surface of objects such as mesh grit, which can produce 10,000 particles per kilogram hitting the surface of objects, whereas conventional slag such as mesh can only produce 10,000 particles hitting the surface of objects, thus using garnet grit can largely reduce the loss of abrasives - usually saving conventional abrasives.
4. High surface finish quality. Brown corundum penetrates deep into surface cavities and pits to reach the bare surface of the metal during the blasting process, so it thoroughly removes all rust, dissolved water salts and other contaminants. The treated metal surface is very clean and free of inclusions and easily achieves a standard grade of quality. A clean surface profile structure with uniform micron peaks per unit area can be easily achieved. In contrast, rough sharp edges of slag such as copper and nickel slag are very likely to remain on the surface of the steel after spray grinding, with approximately as many grains per square metre, leading to failure of the initial coating and poor coating results. Analysis of the difference between brown corundum and diamond other abrasives.
5. Environmental protection. Unlike conventional abrasive materials brown corundum is a purely natural, non-toxic mineral that does not contain free silicon, which causes silicosis, or toxic heavy metals or radioactive contaminants. In addition, the low consumption and recyclable nature of the product significantly reduces the amount and cost of waste disposal after the product has been used. Analysis of the differences between brown corundum and other abrasives. 6.
6. Recyclable. Brown corundum is very suitable for a wide range of applications. Under normal circumstances it can be reused several times. If it has not lost its cutting power after a few cycles, it can be recycled more often. After it has lost its cutting capacity, it can be recycled for use in the construction industry as a cement additive.