1990 Volume 39 Issue 9 Pages 474-478
Several methods of preparing gamma ferric oxyhydroxide (γ-FeOOH) are currently available. But these methods are limited to prepare γ-FeOOH only in small amounts, and not adequate to produce it in the scale of mass production. We have developed a novel method suitable for producing γ-FeOOH in both laboratory scale and industrial scale. This process employs catalytic oxidation of ferrous iron and crystal growth in aqueous solution. The γ-FeOOH prepared by this process has several characteristics different from the conventional ones. The first is the shape of the particle. It has a round form with a diameter of about 2 to 10μm. The second characteristic is the crystallographical feature of the particle. Round particle is composed of many plate-like single crystals which combine spokewise with each other. The particle is in high crystalline state which enables to acquire low contents of the impurities. This product may be used as a standard material in the corrosion research.
