The impurities in the manufacturing process of white corundum grinding powder determine its service life.

　　The raw material for white corundum is A1203 crystals from the furnace core material or large blocks from the grinding wheel factory, with a content greater than 98.5%. The particle sizes are 36#, 46#, and 100#. The SiO2 content in the raw materials should be minimized to prepare white corundum grinding powder. The manufacturing process is as follows:

　　1. The equipment used includes ball mills (with specifications of 150X300, 260X300, 350X500), glass tanks (300X500), high-temperature electric furnaces, drying ovens, cleaning tanks, and ventilation boxes.

　　2. The manufacturing process is briefly described as follows:

　　a. Crushing

　　Place quenching steel balls of different diameters and copper raw materials into the drum, add water, seal the lid with a rubber mat, and then rotate the drum. The abrasive is crushed under the impact of the steel balls.

　　b. Acid washing and water washing

　　The purpose is to wash away the iron impurities in the abrasive.

　　C. Sorting

　　Sorting is carried out in the glass tank using the water selection method.

　　d. Drying

　　Heat to 10(T20(TC for drying in the drying oven, and after drying, use a glass rod or horn spoon to grind the lumps finely.

　　e. Calcination

　　Place the white corundum grinding powder in an electric furnace or muffle furnace, raise the temperature from room temperature to 850 degrees, and for W0.5-w1 grinding powder, it can sometimes reach 1200 degrees, then maintain the temperature for 5 hours.

　　f. Soaking

　　The abrasives used for embedded sand grinding and fine polishing need to be treated. The soaking requirement is: add 0.4g of stearic acid to 20g of grinding powder and then add 200 milliliters of aviation gasoline, and soak in a grinding mouth glass bottle for more than seven days.

　　The impurities in white corundum determine its service life. The quality of white corundum affects its effectiveness. White corundum will contain impurities during the production process, with the main impurities being SiO2, Fe2O3, and TiO2. The fewer impurities, the higher the quality of white corundum. The content of AL2O3 in white corundum also directly indicates the quality of white corundum. The impurities in white corundum determine its service life, and the following is a detailed explanation:

　　White corundum can also be used as a refractory material. If it contains impurities, it will affect its refractory performance. Among the impurities in refractory materials, some are easily fusible, while others have a high melting point but can produce easily fusible substances when coexisting with the main components. Therefore, the presence of impurities often has a strong fluxing effect on the main components. Although the fluxing effect can sometimes assist in the liquid phase sintering of materials, it poses serious harm to the material's resistance to high temperatures. White corundum is mainly used as an abrasive. In recent years, it has been widely used in refractory materials, such as iron hook casting materials, anhydrous clay, corundum bricks, prefabricated parts, breathable bricks, ladle bricks, and magnesia-alumina-carbon bricks.

　　White corundum is generally used as aggregate and fine powder in refractory materials. Its advantages include high refractoriness, wear resistance, erosion resistance, high bulk density, and high alumina content, mainly used in high-alumina and alumina systems. When making products, it also has a high load softening temperature and high-temperature volume stability. The impurities in white corundum determine the lifespan of the product during use. Since impurities have not been completely removed during smelting, white corundum also contains calcium hexaaluminate, calcium plagioclase, spinel, rutile, and other sub-crystalline phases, as well as glass phases, ferroalloys, and solid solutions.