Method for improving the purity of high-temperature alumina powder

Method for improving the purity of high-temperature alumina powder

High-temperature alumina is a new type of ultra-fine powder. The original crystal particle size is very small (0.5-1um), and the wear resistance is better. It is easy to crush into fine powder with an average particle size of about 1um, and the particle size of the fine powder is narrow. Good filling performance and pouring activity, water-containing slurry has good thixotropic fluidity. High-temperature alumina powder contains some inorganic impurities like iron, silicon, sodium, potassium, copper, nickel, etc. The presence of these substances may affect the purity and use effect of the product to a certain extent, so in order not to affect its normal use, we need to think Ways to improve its purity, let's take a look at it together.

High-purity raw materials are selected for the purification of high-temperature alumina powder. Use low-iron, low-sodium, and low-silicon production grinding equipment for processing. And to increase the smelting power. The smelting furnace must have good heat preservation and air permeability. The reactant must have an accurate ratio of silicon to carbon. Maintain a longer smelting time.

If we want to improve the purity of high-temperature alumina, we not only require high-quality raw materials, but also have certain requirements for equipment. High-purity high-temperature alumina powder can increase the sintered density, high-temperature bending resistance and compressive strength of the castable, and enhance the wear-resistance, corrosion resistance, and erosion resistance of the castable. Various ceramic products produced by indeterminate refractory materials, knives, precision alumina ceramics, and isostatic pressing can be used.