How is artificial corundum abrasive made?

Brown corundum is made by mixing bauxite with high alumina content into carbon materials such as anthracite or coke and iron filings in an electric arc furnace. The function of carbon material is to reduce silica and iron oxide in bauxite. Brown corundum has high purity, excellent flowability, good crystallization, low linear expansion coefficient, high temperature resistance and corrosion resistance. It is an essential industrial material for abrasive grinding tools, sand blasting and grinding, refractories and other industries. It is called "industrial tooth".anionic polyacrylamide

The functions of iron filings are as follows:

① Iron alloy with reduced silicon and iron is formed with a density higher than that of corundum, which is separated from corundum melt and deposited at the bottom of furnace;

② So that the ferroalloy has a high magnetic induction, so that the ferroalloy mixed in corundum can be separated by magnetic separation. The molten liquid is cooled into crystalline blocks, and then crushed, screened and magnetic separated into products of various sizes. If the melting liquid is cooled rapidly, it will become microcrystalline corundum; if the reduction degree is controlled and more impurities such as silica and iron oxide remain, black corundum can be obtained.

Single crystal corundum is obtained by adding pyrite into the furnace charge, and the single crystal corundum particles are obtained by removing aluminum sulfide from the frit by water. Zirconium corundum is made by smelting the same raw material as brown corundum, plus raw materials with high content of zirconia (such as zircon sand), and is also made by mixing alumina powder and zirconia powder. The finished product contains 10-40% zirconia.

White corundum is a kind of high purity aluminum oxide powder melted in electric arc furnace, and the cooled crystal block is processed into products with various particle sizes. When alumina powder is melted, chromium corundum can be obtained by adding proper amount of chromium trioxide.

Sintered corundum abrasives are made by grinding bauxite or alumina powder with high alumina content to less than 10 μ m, adding appropriate additives (such as zirconia, magnesium oxide) and binder, pressing and cutting into short thin rods (about 1 mm in diameter and 5 mm in length) and sintered in a kiln.polyacrylamide powder for sale