High Purity Alumina (HPA)

    High purity alumina is a key raw material for LED production, sapphire glass, exhaust-gas catalysts, and other high-tech applications where purity requirements have increased from 4N (99.99%) to 6N (99.9999%) and beyond. JOECHRE filtration systems are used in two major process routes: aluminum alkoxide hydrolysis and direct hydrolysis from refined aluminum. In the alkoxide route, JOECHRE filters remove residual metallic impurities and undissolved solids from alcohol-alumina complexes before further processing. In the direct hydrolysis method, our filters separate Al(OH)₃ from the reaction mixture, delivering cakes with high solid content and low product loss. Compared to filter presses or centrifuges, the fully automatic operation of JOECHRE filters offers superior filtrate clarity, reduced maintenance, and higher yield, supporting consistent production of ultrapure alumina.​