The main role of inert alumina ball
Maintaining said particles in contact with said solution while reducing the salt concentration gradually at conditions to minimize the concentration gradient between said solution and the internal aqueous phase of said particles until said solution is substantially salt-free. Separating, and drying and calcining the resulting salt-free hydrogel particles to form amorphous, high surface area alumina ball.
It has been the practice to retain and age the hydrogel spheres in the oil suspending media for an extended period, and thereafter in an aqueous alkaline media for a further extended period. The oil aging process has heretofore been considered as essential to obviate excessive cracking and sphere disintegration during the subsequent aqueous phase treatments. However, the practice also promotes the formation of crystalline boehmite Raschig Ring which, upon calcination at 370-650 C., is converted substantially to gamma- alumina.
Inert ceramic ball is widely used in petrochemical industry, chemical industry, fertilizer industry, natural gas industry and environment protection etc. With functions as covering and supporting materials for catalyst in reactors and packing for towers. The main role of inert alumina ball is increasing the distribution of liquid and gas, holding and protecting the activated catalyst with low strength.