Explanation

Also called spray granulation. Disperse the salt solution into small droplets through a nozzle, where the droplets meet with hot air and the solvent in the droplets evaporates. Forming particles. Extremely fine particles can be collected using various methods such as cyclone, cloth bag, electrostatic leaching, etc. Including pressure spray method, centrifugal spray drying method and airflow spray drying method. Compared with the interphase reaction method, the P-AI2O3 and ferrite powders prepared by this method have finer grains of sintering body after molding and sintering. The advantage of this method is that the composition uniformity is good. It can avoid too large size and too hard strength of aggregates, and its sintering property is better than that of ordinary oven drying method. The disadvantage is that there are still aggregates in the product. It is sensitive to spray process conditions and its quality is unstable. At present, spray drying method is not generally used for pulverizing, but mainly used for granulation, and is developing to spray thermal decomposition method.

Classification